Updated withRetries for MySQL

Rewrote persistent data system

build.gradle.kts

@@ -14,7 +14,6 @@ plugins {
     id("maven-publish")
     id("java")
     kotlin("jvm") version "1.9.21"
-    kotlin("plugin.serialization") version "1.9.21"
 }
 
 dependencies {
@@ -41,7 +40,6 @@ allprojects {
     apply(plugin = "maven-publish")
     apply(plugin = "io.github.goooler.shadow")
     apply(plugin = "kotlin")
-    apply(plugin = "org.jetbrains.kotlin.plugin.serialization")
 
     repositories {
         mavenCentral()
@@ -63,7 +61,7 @@ allprojects {
         maven("https://repo.extendedclip.com/content/repositories/placeholderapi/")
 
         // ProtocolLib
-        //maven("https://repo.dmulloy2.net/nexus/repository/public/")
+        maven("https://repo.dmulloy2.net/nexus/repository/public/")
 
         // WorldGuard
         maven("https://maven.enginehub.org/repo/")
@@ -212,7 +210,6 @@ tasks {
         //relocate("com.mysql", "com.willfp.eco.libs.mysql")
         relocate("com.mongodb", "com.willfp.eco.libs.mongodb")
         relocate("org.bson", "com.willfp.eco.libs.bson")
-        relocate("org.litote", "com.willfp.eco.libs.litote")
         relocate("org.reactivestreams", "com.willfp.eco.libs.reactivestreams")
         relocate("reactor.", "com.willfp.eco.libs.reactor.") // Dot in name to be safe
         relocate("com.moandjiezana.toml", "com.willfp.eco.libs.toml")

eco-api/src/main/java/com/willfp/eco/core/data/handlers/DataTypeSerializer.java

@@ -0,0 +1,44 @@
+package com.willfp.eco.core.data.handlers;
+
+import com.willfp.eco.core.data.keys.PersistentDataKey;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.UUID;
+
+/**
+ * Handles data read/write for a {@link com.willfp.eco.core.data.keys.PersistentDataKeyType} for a specific
+ * data handler.
+ *
+ * @param <T> The type of data.
+ */
+public abstract class DataTypeSerializer<T> {
+    /**
+     * Create a new data type serializer.
+     */
+    protected DataTypeSerializer() {
+
+    }
+
+    /**
+     * Read a value.
+     *
+     * @param uuid The uuid.
+     * @param key  The key.
+     * @return The value.
+     */
+    @Nullable
+    public abstract T readAsync(@NotNull final UUID uuid,
+                                @NotNull final PersistentDataKey<T> key);
+
+    /**
+     * Write a value.
+     *
+     * @param uuid  The uuid.
+     * @param key   The key.
+     * @param value The value.
+     */
+    public abstract void writeAsync(@NotNull final UUID uuid,
+                                    @NotNull final PersistentDataKey<T> key,
+                                    @NotNull final T value);
+}

eco-api/src/main/java/com/willfp/eco/core/data/handlers/PersistentDataHandler.java

@@ -0,0 +1,180 @@
+package com.willfp.eco.core.data.handlers;
+
+import com.willfp.eco.core.data.keys.PersistentDataKey;
+import com.willfp.eco.core.registry.Registrable;
+import com.willfp.eco.core.tuples.Pair;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Set;
+import java.util.UUID;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
+import java.util.concurrent.TimeUnit;
+import java.util.stream.Collectors;
+
+/**
+ * Handles persistent data.
+ */
+public abstract class PersistentDataHandler implements Registrable {
+    /**
+     * The id.
+     */
+    private final String id;
+
+    /**
+     * The executor.
+     */
+    private final ExecutorService executor = Executors.newCachedThreadPool();
+
+    /**
+     * Create a new persistent data handler.
+     *
+     * @param id The id.
+     */
+    protected PersistentDataHandler(@NotNull final String id) {
+        this.id = id;
+    }
+
+    /**
+     * Get all UUIDs with saved data.
+     * <p>
+     * This is a blocking operation.
+     *
+     * @return All saved UUIDs.
+     */
+    public abstract Set<UUID> getSavedUUIDs();
+
+    /**
+     * Save to disk.
+     * <p>
+     * If write commits to disk, this method does not need to be overridden.
+     * <p>
+     * This method is called asynchronously.
+     */
+    protected void doSave() {
+        // Save to disk
+    }
+
+    /**
+     * If the handler should autosave.
+     *
+     * @return If the handler should autosave.
+     */
+    public boolean shouldAutosave() {
+        return true;
+    }
+
+    /**
+     * Save the data.
+     */
+    public final void save() {
+        executor.submit(this::doSave);
+    }
+
+    /**
+     * Read a key from persistent data.
+     *
+     * @param uuid The uuid.
+     * @param key  The key.
+     * @param <T>  The type of the key.
+     * @return The value, or null if not found.
+     */
+    @Nullable
+    public final <T> T read(@NotNull final UUID uuid,
+                            @NotNull final PersistentDataKey<T> key) {
+        DataTypeSerializer<T> serializer = key.getType().getSerializer(this);
+        Future<T> future = executor.submit(() -> serializer.readAsync(uuid, key));
+
+        try {
+            return future.get();
+        } catch (InterruptedException | ExecutionException e) {
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+    /**
+     * Write a key to persistent data.
+     *
+     * @param uuid  The uuid.
+     * @param key   The key.
+     * @param value The value.
+     * @param <T>   The type of the key.
+     */
+    public final <T> void write(@NotNull final UUID uuid,
+                                @NotNull final PersistentDataKey<T> key,
+                                @NotNull final T value) {
+        DataTypeSerializer<T> serializer = key.getType().getSerializer(this);
+        executor.submit(() -> serializer.writeAsync(uuid, key, value));
+    }
+
+    /**
+     * Serialize profile.
+     *
+     * @param uuid The uuid to serialize.
+     * @param keys The keys to serialize.
+     * @return The serialized data.
+     */
+    @NotNull
+    public final SerializedProfile serializeProfile(@NotNull final UUID uuid,
+                                                    @NotNull final Set<PersistentDataKey<?>> keys) {
+        Map<PersistentDataKey<?>, CompletableFuture<Object>> futures = keys.stream()
+                .collect(Collectors.toMap(
+                        key -> key,
+                        key -> CompletableFuture.supplyAsync(() -> read(uuid, key), executor)
+                ));
+
+        Map<PersistentDataKey<?>, Object> data = futures.entrySet().stream()
+                .map(entry -> new Pair<PersistentDataKey<?>, Object>(entry.getKey(), entry.getValue().join()))
+                .filter(entry -> entry.getSecond() != null)
+                .collect(Collectors.toMap(Pair::getFirst, Pair::getSecond));
+
+        return new SerializedProfile(uuid, data);
+    }
+
+    /**`
+     * Load profile data.
+     *
+     * @param profile The profile.
+     */
+    @SuppressWarnings("unchecked")
+    public final void loadSerializedProfile(@NotNull final SerializedProfile profile) {
+        for (Map.Entry<PersistentDataKey<?>, Object> entry : profile.data().entrySet()) {
+            PersistentDataKey<?> key = entry.getKey();
+            Object value = entry.getValue();
+
+            // This cast is safe because the data is serialized
+            write(profile.uuid(), (PersistentDataKey<? super Object>) key, value);
+        }
+    }
+
+    /**
+     * Save and shutdown the handler.
+     *
+     * @throws InterruptedException If the writes could not be awaited.
+     */
+    public final void shutdown() throws InterruptedException {
+        doSave();
+
+        if (executor.isShutdown()) {
+            return;
+        }
+
+        executor.shutdown();
+        while (!executor.awaitTermination(2, TimeUnit.MINUTES)) {
+            // Wait
+        }
+    }
+
+    @Override
+    @NotNull
+    public final String getID() {
+        return id;
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/data/handlers/SerializedProfile.java

@@ -0,0 +1,20 @@
+package com.willfp.eco.core.data.handlers;
+
+import com.willfp.eco.core.data.keys.PersistentDataKey;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.Map;
+import java.util.UUID;
+
+/**
+ * Serialized profile.
+ *
+ * @param uuid The uuid.
+ * @param data The data.
+ */
+public record SerializedProfile(
+        @NotNull UUID uuid,
+        @NotNull Map<PersistentDataKey<?>, Object> data
+) {
+
+}

eco-api/src/main/java/com/willfp/eco/core/data/keys/PersistentDataKey.java

@@ -34,6 +34,19 @@ public final class PersistentDataKey<T> {
      */
     private final boolean isLocal;
 
+    /**
+     * Create a new Persistent Data Key.
+     *
+     * @param key          The key.
+     * @param type         The data type.
+     * @param defaultValue The default value.
+     */
+    public PersistentDataKey(@NotNull final NamespacedKey key,
+                             @NotNull final PersistentDataKeyType<T> type,
+                             @NotNull final T defaultValue) {
+        this(key, type, defaultValue, false);
+    }
+
     /**
      * Create a new Persistent Data Key.
      *
@@ -54,24 +67,6 @@ public final class PersistentDataKey<T> {
         Eco.get().registerPersistentKey(this);
     }
 
-    /**
-     * Create a new Persistent Data Key.
-     *
-     * @param key          The key.
-     * @param type         The data type.
-     * @param defaultValue The default value.
-     */
-    public PersistentDataKey(@NotNull final NamespacedKey key,
-                             @NotNull final PersistentDataKeyType<T> type,
-                             @NotNull final T defaultValue) {
-        this.key = key;
-        this.defaultValue = defaultValue;
-        this.type = type;
-        this.isLocal = false;
-
-        Eco.get().registerPersistentKey(this);
-    }
-
     @Override
     public String toString() {
         return "PersistentDataKey{"

eco-api/src/main/java/com/willfp/eco/core/data/keys/PersistentDataKeyType.java

@@ -1,12 +1,17 @@
 package com.willfp.eco.core.data.keys;
 
 import com.willfp.eco.core.config.interfaces.Config;
+import com.willfp.eco.core.data.handlers.DataTypeSerializer;
+import com.willfp.eco.core.data.handlers.PersistentDataHandler;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 import java.math.BigDecimal;
 import java.util.ArrayList;
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
+import java.util.NoSuchElementException;
 import java.util.Objects;
 
 /**
@@ -61,18 +66,14 @@ public final class PersistentDataKeyType<T> {
     private final String name;
 
     /**
-     * Get the name of the key type.
-     *
-     * @return The name.
+     * The serializers for this key type.
      */
-    public String name() {
-        return name;
-    }
+    private final Map<PersistentDataHandler, DataTypeSerializer<T>> serializers = new HashMap<>();
 
     /**
      * Create new PersistentDataKeyType.
      *
-     * @param name      The name.
+     * @param name The name.
      */
     private PersistentDataKeyType(@NotNull final String name) {
         VALUES.add(this);
@@ -80,6 +81,44 @@ public final class PersistentDataKeyType<T> {
         this.name = name;
     }
 
+    /**
+     * Get the name of the key type.
+     *
+     * @return The name.
+     */
+    @NotNull
+    public String name() {
+        return name;
+    }
+
+    /**
+     * Register a serializer for this key type.
+     *
+     * @param handler    The handler.
+     * @param serializer The serializer.
+     */
+    public void registerSerializer(@NotNull final PersistentDataHandler handler,
+                                   @NotNull final DataTypeSerializer<T> serializer) {
+        this.serializers.put(handler, serializer);
+    }
+
+    /**
+     * Get the serializer for a handler.
+     *
+     * @param handler The handler.
+     * @return The serializer.
+     */
+    @NotNull
+    public DataTypeSerializer<T> getSerializer(@NotNull final PersistentDataHandler handler) {
+        DataTypeSerializer<T> serializer = this.serializers.get(handler);
+
+        if (serializer == null) {
+            throw new NoSuchElementException("No serializer for handler: " + handler);
+        }
+
+        return serializer;
+    }
+
     @Override
     public boolean equals(@Nullable final Object that) {
         if (this == that) {

eco-api/src/main/java/com/willfp/eco/core/proxy/ProxyConstants.java

@@ -2,6 +2,7 @@ package com.willfp.eco.core.proxy;
 
 import com.willfp.eco.core.version.Version;
 import org.bukkit.Bukkit;
+import org.jetbrains.annotations.NotNull;
 
 import java.util.Arrays;
 import java.util.List;
@@ -35,6 +36,13 @@ public final class ProxyConstants {
         throw new UnsupportedOperationException("This is a utility class and cannot be instantiated");
     }
 
+    private static String convertVersion(@NotNull final String version) {
+        return switch (version) {
+            case "v1_21_1" -> "v1_21";
+            default -> version;
+        };
+    }
+
     static {
         String currentMinecraftVersion = Bukkit.getServer().getBukkitVersion().split("-")[0];
         String nmsVersion;
@@ -45,6 +53,6 @@ public final class ProxyConstants {
             nmsVersion = "v" + currentMinecraftVersion.replace(".", "_");
         }
 
-        NMS_VERSION = nmsVersion;
+        NMS_VERSION = convertVersion(nmsVersion);
     }
 }

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/items/ArgParserEnchantment.kt

@@ -14,12 +14,16 @@ object ArgParserEnchantment : LookupArgParser {
         val enchants = mutableMapOf<Enchantment, Int>()
 
         for (arg in args) {
-            val argSplit = arg.split(":")
+            try {
+                val argSplit = arg.split(":")
 
-            val enchant = Enchantment.getByKey(NamespacedKey.minecraft(argSplit[0].lowercase())) ?: continue
-            val level = argSplit.getOrNull(1)?.toIntOrNull() ?: enchant.maxLevel
+                val enchant = Enchantment.getByKey(NamespacedKey.minecraft(argSplit[0].lowercase())) ?: continue
+                val level = argSplit.getOrNull(1)?.toIntOrNull() ?: enchant.maxLevel
 
-            enchants[enchant] = level
+                enchants[enchant] = level
+            } catch (e: IllegalArgumentException) {
+                continue
+            }
         }
 
         if (enchants.isEmpty()) {

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/particle/ParticleFactoryRGB.kt

@@ -12,7 +12,7 @@ object ParticleFactoryRGB : ParticleFactory {
         if (Prerequisite.HAS_1_20_5.isMet) {
             Particle.valueOf("DUST")
         } else {
-            Particle.valueOf("REDSTONE_DUST")
+            Particle.valueOf("REDSTONE")
         }
     }.getOrNull()
 

eco-core/core-nms/common/src/main/kotlin/com/willfp/eco/internal/spigot/proxy/common/packet/display/PacketAutoRecipe.kt

@@ -3,12 +3,19 @@ package com.willfp.eco.internal.spigot.proxy.common.packet.display
 import com.willfp.eco.core.EcoPlugin
 import com.willfp.eco.core.packet.PacketEvent
 import com.willfp.eco.core.packet.PacketListener
+import com.willfp.eco.internal.spigot.proxy.common.toResourceLocation
+import com.willfp.eco.util.namespacedKeyOf
 import net.minecraft.network.protocol.game.ClientboundPlaceGhostRecipePacket
 import net.minecraft.resources.ResourceLocation
 
 class PacketAutoRecipe(
     private val plugin: EcoPlugin
 ) : PacketListener {
+    private val fKey = ClientboundPlaceGhostRecipePacket::class.java
+        .declaredFields
+        .first { it.type == ResourceLocation::class.java }
+        .apply { isAccessible = true }
+
     override fun onSend(event: PacketEvent) {
         val packet = event.packet.handle as? ClientboundPlaceGhostRecipePacket ?: return
 
@@ -24,9 +31,7 @@ class PacketAutoRecipe(
             return
         }
 
-        val fKey = packet.javaClass.getDeclaredField("b")
-        fKey.isAccessible = true
         val key = fKey[packet] as ResourceLocation
-        fKey[packet] = ResourceLocation(key.namespace, key.path + "_displayed")
+        fKey[packet] = namespacedKeyOf(key.namespace, key.path + "_displayed").toResourceLocation()
     }
 }

eco-core/core-nms/modern/src/main/kotlin/com/willfp/eco/internal/spigot/proxy/common/modern/NewEcoFastItemStack.kt

@@ -25,6 +25,7 @@ import net.minecraft.util.Unit
 import net.minecraft.world.item.component.CustomData
 import net.minecraft.world.item.component.CustomModelData
 import net.minecraft.world.item.component.ItemLore
+import net.minecraft.world.item.enchantment.ItemEnchantments
 import org.bukkit.Bukkit
 import org.bukkit.craftbukkit.CraftRegistry
 import org.bukkit.craftbukkit.CraftServer
@@ -53,7 +54,7 @@ class NewEcoFastItemStack(
     private val pdc = (handle.get(DataComponents.CUSTOM_DATA)?.copyTag() ?: CompoundTag()).makePdc()
 
     override fun getEnchants(checkStored: Boolean): Map<Enchantment, Int> {
-        val enchantments = handle.get(DataComponents.ENCHANTMENTS) ?: return emptyMap()
+        val enchantments = handle.get(DataComponents.ENCHANTMENTS) ?: ItemEnchantments.EMPTY
 
         val map = mutableMapOf<Enchantment, Int>()
 

eco-core/core-plugin/build.gradle.kts

@@ -1,5 +1,3 @@
-import org.gradle.internal.impldep.org.junit.experimental.categories.Categories.CategoryFilter.exclude
-
 group = "com.willfp"
 version = rootProject.version
 
@@ -9,16 +7,13 @@ dependencies {
 
     // Libraries
     implementation("com.github.WillFP:Crunch:1.1.3")
-    implementation("mysql:mysql-connector-java:8.0.25")
-    implementation("org.jetbrains.exposed:exposed-core:0.37.3")
-    implementation("org.jetbrains.exposed:exposed-dao:0.37.3")
-    implementation("org.jetbrains.exposed:exposed-jdbc:0.37.3")
-    implementation("com.zaxxer:HikariCP:5.0.0")
+    implementation("com.mysql:mysql-connector-j:8.4.0")
+    implementation("org.jetbrains.exposed:exposed-core:0.53.0")
+    implementation("org.jetbrains.exposed:exposed-jdbc:0.53.0")
+    implementation("com.zaxxer:HikariCP:5.1.0")
     implementation("net.kyori:adventure-platform-bukkit:4.1.0")
     implementation("org.javassist:javassist:3.29.2-GA")
-    implementation("org.mongodb:mongodb-driver-kotlin-coroutine:5.0.0")
-    implementation("org.jetbrains.kotlinx:kotlinx-serialization-core:1.5.1")
-    implementation("org.mongodb:bson-kotlinx:5.0.0")
+    implementation("org.mongodb:mongodb-driver-kotlin-coroutine:5.1.2")
     implementation("com.moandjiezana.toml:toml4j:0.7.2") {
         exclude(group = "com.google.code.gson", module = "gson")
     }
@@ -29,7 +24,7 @@ dependencies {
     compileOnly("io.papermc.paper:paper-api:1.20.2-R0.1-SNAPSHOT")
 
     // Plugin dependencies
-    compileOnly("com.comphenix.protocol:ProtocolLib:5.0.0-SNAPSHOT")
+    compileOnly("com.comphenix.protocol:ProtocolLib:5.1.0")
     compileOnly("com.sk89q.worldguard:worldguard-bukkit:7.0.7-SNAPSHOT")
     compileOnly("com.github.TechFortress:GriefPrevention:16.17.1")
     compileOnly("com.github.TownyAdvanced:Towny:0.99.5.21") {
@@ -76,7 +71,6 @@ dependencies {
 tasks {
     shadowJar {
         minimize {
-            exclude(dependency("org.litote.kmongo:kmongo-coroutine:.*"))
             exclude(dependency("org.jetbrains.exposed:.*:.*"))
             exclude(dependency("com.willfp:ModelEngineBridge:.*"))
         }

eco-core/core-plugin/src/main/kotlin/com/willfp/eco/internal/spigot/EcoImpl.kt

@@ -4,7 +4,6 @@ import com.willfp.eco.core.Eco
 import com.willfp.eco.core.EcoPlugin
 import com.willfp.eco.core.PluginLike
 import com.willfp.eco.core.PluginProps
-import com.willfp.eco.core.Prerequisite
 import com.willfp.eco.core.command.CommandBase
 import com.willfp.eco.core.command.PluginCommandBase
 import com.willfp.eco.core.config.ConfigType
@@ -44,8 +43,7 @@ import com.willfp.eco.internal.proxy.EcoProxyFactory
 import com.willfp.eco.internal.scheduling.EcoScheduler
 import com.willfp.eco.internal.spigot.data.DataYml
 import com.willfp.eco.internal.spigot.data.KeyRegistry
-import com.willfp.eco.internal.spigot.data.ProfileHandler
-import com.willfp.eco.internal.spigot.data.storage.HandlerType
+import com.willfp.eco.internal.spigot.data.profiles.ProfileHandler
 import com.willfp.eco.internal.spigot.integrations.bstats.MetricHandler
 import com.willfp.eco.internal.spigot.math.DelegatedExpressionHandler
 import com.willfp.eco.internal.spigot.math.ImmediatePlaceholderTranslationExpressionHandler
@@ -74,7 +72,7 @@ import org.bukkit.inventory.ItemStack
 import org.bukkit.inventory.meta.SkullMeta
 import org.bukkit.persistence.PersistentDataContainer
 import java.net.URLClassLoader
-import java.util.*
+import java.util.UUID
 
 private val loadedEcoPlugins = mutableMapOf<String, EcoPlugin>()
 
@@ -82,10 +80,7 @@ private val loadedEcoPlugins = mutableMapOf<String, EcoPlugin>()
 class EcoImpl : EcoSpigotPlugin(), Eco {
     override val dataYml = DataYml(this)
 
-    override val profileHandler = ProfileHandler(
-        HandlerType.valueOf(this.configYml.getString("data-handler").uppercase()),
-        this
-    )
+    override val profileHandler = ProfileHandler(this)
 
     init {
         getProxy(CommonsInitializerProxy::class.java).init(this)
@@ -290,10 +285,10 @@ class EcoImpl : EcoSpigotPlugin(), Eco {
         bukkitAudiences
 
     override fun getServerProfile() =
-        profileHandler.loadServerProfile()
+        profileHandler.getServerProfile()
 
     override fun loadPlayerProfile(uuid: UUID) =
-        profileHandler.load(uuid)
+        profileHandler.getPlayerProfile(uuid)
 
     override fun createDummyEntity(location: Location): Entity =
         getProxy(DummyEntityFactoryProxy::class.java).createDummyEntity(location)

eco-core/core-plugin/src/main/kotlin/com/willfp/eco/internal/spigot/EcoSpigotPlugin.kt

@@ -17,7 +17,6 @@ import com.willfp.eco.core.integrations.mcmmo.McmmoManager
 import com.willfp.eco.core.integrations.placeholder.PlaceholderManager
 import com.willfp.eco.core.integrations.shop.ShopManager
 import com.willfp.eco.core.items.Items
-import com.willfp.eco.core.items.tag.VanillaItemTag
 import com.willfp.eco.core.packet.PacketListener
 import com.willfp.eco.core.particle.Particles
 import com.willfp.eco.core.price.Prices
@@ -62,11 +61,10 @@ import com.willfp.eco.internal.price.PriceFactoryXP
 import com.willfp.eco.internal.price.PriceFactoryXPLevels
 import com.willfp.eco.internal.recipes.AutocrafterPatch
 import com.willfp.eco.internal.spigot.arrows.ArrowDataListener
-import com.willfp.eco.internal.spigot.data.DataListener
 import com.willfp.eco.internal.spigot.data.DataYml
 import com.willfp.eco.internal.spigot.data.PlayerBlockListener
-import com.willfp.eco.internal.spigot.data.ProfileHandler
-import com.willfp.eco.internal.spigot.data.storage.ProfileSaver
+import com.willfp.eco.internal.spigot.data.profiles.ProfileHandler
+import com.willfp.eco.internal.spigot.data.profiles.ProfileLoadListener
 import com.willfp.eco.internal.spigot.drops.CollatedRunnable
 import com.willfp.eco.internal.spigot.eventlisteners.EntityDeathByEntityListeners
 import com.willfp.eco.internal.spigot.eventlisteners.NaturalExpGainListenersPaper
@@ -150,7 +148,7 @@ import org.bukkit.inventory.ItemStack
 
 abstract class EcoSpigotPlugin : EcoPlugin() {
     abstract val dataYml: DataYml
-    protected abstract val profileHandler: ProfileHandler
+    abstract val profileHandler: ProfileHandler
     protected var bukkitAudiences: BukkitAudiences? = null
 
     init {
@@ -259,9 +257,6 @@ abstract class EcoSpigotPlugin : EcoPlugin() {
         // Init FIS
         this.getProxy(FastItemStackFactoryProxy::class.java).create(ItemStack(Material.AIR)).unwrap()
 
-        // Preload categorized persistent data keys
-        profileHandler.initialize()
-
         // Init adventure
         if (!Prerequisite.HAS_PAPER.isMet) {
             bukkitAudiences = BukkitAudiences.create(this)
@@ -282,14 +277,11 @@ abstract class EcoSpigotPlugin : EcoPlugin() {
     override fun createTasks() {
         CollatedRunnable(this)
 
-        this.scheduler.runLater(3) {
-            profileHandler.migrateIfNeeded()
+        if (!profileHandler.migrateIfNecessary()) {
+            profileHandler.profileWriter.startTickingAutosave()
+            profileHandler.profileWriter.startTickingSaves()
         }
 
-        profileHandler.startAutosaving()
-
-        ProfileSaver(this, profileHandler).startTicking()
-
         this.scheduler.runTimer(
             this.configYml.getInt("display-frame-ttl").toLong(),
             this.configYml.getInt("display-frame-ttl").toLong(),
@@ -428,7 +420,7 @@ abstract class EcoSpigotPlugin : EcoPlugin() {
             GUIListener(this),
             ArrowDataListener(this),
             ArmorChangeEventListeners(this),
-            DataListener(this, profileHandler),
+            ProfileLoadListener(this, profileHandler),
             PlayerBlockListener(this),
             ServerLocking
         )

eco-core/core-plugin/src/main/kotlin/com/willfp/eco/internal/spigot/data/EcoProfile.kt

@@ -1,110 +0,0 @@
-package com.willfp.eco.internal.spigot.data
-
-import com.willfp.eco.core.EcoPlugin
-import com.willfp.eco.core.data.PlayerProfile
-import com.willfp.eco.core.data.Profile
-import com.willfp.eco.core.data.ServerProfile
-import com.willfp.eco.core.data.keys.PersistentDataKey
-import com.willfp.eco.core.data.keys.PersistentDataKeyType
-import com.willfp.eco.internal.spigot.data.storage.DataHandler
-import com.willfp.eco.util.namespacedKeyOf
-import java.util.UUID
-import java.util.concurrent.ConcurrentHashMap
-
-abstract class EcoProfile(
-    val data: MutableMap<PersistentDataKey<*>, Any>,
-    val uuid: UUID,
-    private val handler: DataHandler,
-    private val localHandler: DataHandler
-) : Profile {
-    override fun <T : Any> write(key: PersistentDataKey<T>, value: T) {
-        this.data[key] = value
-
-        CHANGE_MAP.add(uuid)
-    }
-
-    override fun <T : Any> read(key: PersistentDataKey<T>): T {
-        @Suppress("UNCHECKED_CAST")
-        if (this.data.containsKey(key)) {
-            return this.data[key] as T
-        }
-
-        this.data[key] = if (key.isSavedLocally) {
-            localHandler.read(uuid, key)
-        } else {
-            handler.read(uuid, key)
-        } ?: key.defaultValue
-
-        return read(key)
-    }
-
-    override fun equals(other: Any?): Boolean {
-        if (other !is EcoProfile) {
-            return false
-        }
-
-        return this.uuid == other.uuid
-    }
-
-    override fun hashCode(): Int {
-        return this.uuid.hashCode()
-    }
-
-    companion object {
-        val CHANGE_MAP: MutableSet<UUID> = ConcurrentHashMap.newKeySet()
-    }
-}
-
-class EcoPlayerProfile(
-    data: MutableMap<PersistentDataKey<*>, Any>,
-    uuid: UUID,
-    handler: DataHandler,
-    localHandler: DataHandler
-) : EcoProfile(data, uuid, handler, localHandler), PlayerProfile {
-    override fun toString(): String {
-        return "EcoPlayerProfile{uuid=$uuid}"
-    }
-}
-
-private val serverIDKey = PersistentDataKey(
-    namespacedKeyOf("eco", "server_id"),
-    PersistentDataKeyType.STRING,
-    ""
-)
-
-private val localServerIDKey = PersistentDataKey(
-    namespacedKeyOf("eco", "local_server_id"),
-    PersistentDataKeyType.STRING,
-    ""
-)
-
-class EcoServerProfile(
-    data: MutableMap<PersistentDataKey<*>, Any>,
-    handler: DataHandler,
-    localHandler: DataHandler
-) : EcoProfile(data, serverProfileUUID, handler, localHandler), ServerProfile {
-    override fun getServerID(): String {
-        if (this.read(serverIDKey).isBlank()) {
-            this.write(serverIDKey, UUID.randomUUID().toString())
-        }
-
-        return this.read(serverIDKey)
-    }
-
-    override fun getLocalServerID(): String {
-        if (this.read(localServerIDKey).isBlank()) {
-            this.write(localServerIDKey, UUID.randomUUID().toString())
-        }
-
-        return this.read(localServerIDKey)
-    }
-
-    override fun toString(): String {
-        return "EcoServerProfile"
-    }
-}
-
-private val PersistentDataKey<*>.isSavedLocally: Boolean
-    get() = this == localServerIDKey
-            || EcoPlugin.getPlugin(this.key.namespace)?.isUsingLocalStorage == true
-            || this.isLocal

eco-core/core-plugin/src/main/kotlin/com/willfp/eco/internal/spigot/data/KeyRegistry.kt

@@ -1,55 +1,20 @@
 package com.willfp.eco.internal.spigot.data
 
-import com.willfp.eco.core.config.interfaces.Config
 import com.willfp.eco.core.data.keys.PersistentDataKey
-import com.willfp.eco.core.data.keys.PersistentDataKeyType
 import org.bukkit.NamespacedKey
-import java.math.BigDecimal
 
 object KeyRegistry {
     private val registry = mutableMapOf<NamespacedKey, PersistentDataKey<*>>()
 
     fun registerKey(key: PersistentDataKey<*>) {
-        if (this.registry.containsKey(key.key)) {
-            this.registry.remove(key.key)
+        if (key.defaultValue == null) {
+            throw IllegalArgumentException("Default value cannot be null!")
         }
 
-        validateKey(key)
-
         this.registry[key.key] = key
     }
 
-    fun getRegisteredKeys(): MutableSet<PersistentDataKey<*>> {
-        return registry.values.toMutableSet()
-    }
-
-    private fun <T> validateKey(key: PersistentDataKey<T>) {
-        val default = key.defaultValue
-
-        when (key.type) {
-            PersistentDataKeyType.INT -> if (default !is Int) {
-                throw IllegalArgumentException("Invalid Data Type! Should be Int")
-            }
-            PersistentDataKeyType.DOUBLE -> if (default !is Double) {
-                throw IllegalArgumentException("Invalid Data Type! Should be Double")
-            }
-            PersistentDataKeyType.BOOLEAN -> if (default !is Boolean) {
-                throw IllegalArgumentException("Invalid Data Type! Should be Boolean")
-            }
-            PersistentDataKeyType.STRING -> if (default !is String) {
-                throw IllegalArgumentException("Invalid Data Type! Should be String")
-            }
-            PersistentDataKeyType.STRING_LIST -> if (default !is List<*> || default.firstOrNull() !is String?) {
-                throw IllegalArgumentException("Invalid Data Type! Should be String List")
-            }
-            PersistentDataKeyType.CONFIG -> if (default !is Config) {
-                throw IllegalArgumentException("Invalid Data Type! Should be Config")
-            }
-            PersistentDataKeyType.BIG_DECIMAL -> if (default !is BigDecimal) {
-                throw IllegalArgumentException("Invalid Data Type! Should be BigDecimal")
-            }
-
-            else -> throw NullPointerException("Null value found!")
-        }
+    fun getRegisteredKeys(): Set<PersistentDataKey<*>> {
+        return registry.values.toSet()
     }
 }

eco-core/core-plugin/src/main/kotlin/com/willfp/eco/internal/spigot/data/ProfileHandler.kt

@@ -1,185 +0,0 @@
-package com.willfp.eco.internal.spigot.data
-
-import com.willfp.eco.core.data.PlayerProfile
-import com.willfp.eco.core.data.Profile
-import com.willfp.eco.core.data.ServerProfile
-import com.willfp.eco.core.data.keys.PersistentDataKey
-import com.willfp.eco.core.data.profile
-import com.willfp.eco.internal.spigot.EcoSpigotPlugin
-import com.willfp.eco.internal.spigot.ServerLocking
-import com.willfp.eco.internal.spigot.data.storage.DataHandler
-import com.willfp.eco.internal.spigot.data.storage.HandlerType
-import com.willfp.eco.internal.spigot.data.storage.MongoDataHandler
-import com.willfp.eco.internal.spigot.data.storage.MySQLDataHandler
-import com.willfp.eco.internal.spigot.data.storage.YamlDataHandler
-import org.bukkit.Bukkit
-import java.util.UUID
-
-val serverProfileUUID = UUID(0, 0)
-
-class ProfileHandler(
-    private val type: HandlerType,
-    private val plugin: EcoSpigotPlugin
-) {
-    private val loaded = mutableMapOf<UUID, EcoProfile>()
-
-    private val localHandler = YamlDataHandler(plugin, this)
-
-    val handler: DataHandler = when (type) {
-        HandlerType.YAML -> localHandler
-        HandlerType.MYSQL -> MySQLDataHandler(plugin, this)
-        HandlerType.MONGO -> MongoDataHandler(plugin, this)
-    }
-
-    fun accessLoadedProfile(uuid: UUID): EcoProfile? =
-        loaded[uuid]
-
-    fun loadGenericProfile(uuid: UUID): Profile {
-        val found = loaded[uuid]
-        if (found != null) {
-            return found
-        }
-
-        val data = mutableMapOf<PersistentDataKey<*>, Any>()
-
-        val profile = if (uuid == serverProfileUUID)
-            EcoServerProfile(data, handler, localHandler) else EcoPlayerProfile(data, uuid, handler, localHandler)
-
-        loaded[uuid] = profile
-        return profile
-    }
-
-    fun load(uuid: UUID): PlayerProfile {
-        return loadGenericProfile(uuid) as PlayerProfile
-    }
-
-    fun loadServerProfile(): ServerProfile {
-        return loadGenericProfile(serverProfileUUID) as ServerProfile
-    }
-
-    fun saveKeysFor(uuid: UUID, keys: Set<PersistentDataKey<*>>) {
-        val profile = accessLoadedProfile(uuid) ?: return
-        val map = mutableMapOf<PersistentDataKey<*>, Any>()
-
-        for (key in keys) {
-            map[key] = profile.data[key] ?: continue
-        }
-
-        handler.saveKeysFor(uuid, map)
-
-        // Don't save to local handler if it's the same handler.
-        if (localHandler != handler) {
-            localHandler.saveKeysFor(uuid, map)
-        }
-    }
-
-    fun unloadPlayer(uuid: UUID) {
-        loaded.remove(uuid)
-    }
-
-    fun save() {
-        handler.save()
-
-        if (localHandler != handler) {
-            localHandler.save()
-        }
-    }
-
-    fun migrateIfNeeded() {
-        if (!plugin.configYml.getBool("perform-data-migration")) {
-            return
-        }
-
-        if (!plugin.dataYml.has("previous-handler")) {
-            plugin.dataYml.set("previous-handler", type.name)
-            plugin.dataYml.save()
-        }
-
-
-        val previousHandlerType = HandlerType.valueOf(plugin.dataYml.getString("previous-handler"))
-
-        if (previousHandlerType == type) {
-            return
-        }
-
-        val previousHandler = when (previousHandlerType) {
-            HandlerType.YAML -> YamlDataHandler(plugin, this)
-            HandlerType.MYSQL -> MySQLDataHandler(plugin, this)
-            HandlerType.MONGO -> MongoDataHandler(plugin, this)
-        }
-
-        ServerLocking.lock("Migrating player data! Check console for more information.")
-
-        plugin.logger.info("eco has detected a change in data handler!")
-        plugin.logger.info("Migrating server data from ${previousHandlerType.name} to ${type.name}")
-        plugin.logger.info("This will take a while!")
-
-        plugin.logger.info("Initializing previous handler...")
-        previousHandler.initialize()
-
-        val players = Bukkit.getOfflinePlayers().map { it.uniqueId }
-
-        plugin.logger.info("Found data for ${players.size} players!")
-
-        /*
-        Declared here as its own function to be able to use T.
-         */
-        fun <T : Any> migrateKey(uuid: UUID, key: PersistentDataKey<T>, from: DataHandler, to: DataHandler) {
-            val previous: T? = from.read(uuid, key)
-            if (previous != null) {
-                Bukkit.getOfflinePlayer(uuid).profile.write(key, previous) // Nope, no idea.
-                to.write(uuid, key, previous)
-            }
-        }
-
-        var i = 1
-        for (uuid in players) {
-            plugin.logger.info("Migrating data for $uuid... ($i / ${players.size})")
-            for (key in PersistentDataKey.values()) {
-                // Why this? Because known points *really* likes to break things with the legacy MySQL handler.
-                if (key.key.key == "known_points") {
-                    continue
-                }
-
-                try {
-                    migrateKey(uuid, key, previousHandler, handler)
-                } catch (e: Exception) {
-                    plugin.logger.info("Could not migrate ${key.key} for $uuid! This is probably because they do not have any data.")
-                }
-            }
-
-            i++
-        }
-
-        plugin.logger.info("Saving new data...")
-        handler.save()
-        plugin.logger.info("Updating previous handler...")
-        plugin.dataYml.set("previous-handler", type.name)
-        plugin.dataYml.save()
-        plugin.logger.info("The server will now automatically be restarted...")
-
-        ServerLocking.unlock()
-
-        Bukkit.getServer().shutdown()
-    }
-
-    fun initialize() {
-        handler.initialize()
-        if (localHandler != handler) {
-            localHandler.initialize()
-        }
-    }
-
-    fun startAutosaving() {
-        if (!plugin.configYml.getBool("yaml.autosave")) {
-            return
-        }
-
-        val interval = plugin.configYml.getInt("yaml.autosave-interval") * 20L
-
-        plugin.scheduler.runTimer(20, interval) {
-            handler.saveAsync()
-            localHandler.saveAsync()
-        }
-    }
-}

eco-core/core-plugin/src/main/kotlin/com/willfp/eco/internal/spigot/data/handlers/PersistentDataHandlers.kt

@@ -0,0 +1,40 @@
+package com.willfp.eco.internal.spigot.data.handlers
+
+import com.willfp.eco.core.data.handlers.PersistentDataHandler
+import com.willfp.eco.core.registry.KRegistrable
+import com.willfp.eco.core.registry.Registry
+import com.willfp.eco.internal.spigot.EcoSpigotPlugin
+import com.willfp.eco.internal.spigot.data.handlers.impl.MongoDBPersistentDataHandler
+import com.willfp.eco.internal.spigot.data.handlers.impl.MySQLPersistentDataHandler
+import com.willfp.eco.internal.spigot.data.handlers.impl.YamlPersistentDataHandler
+
+abstract class PersistentDataHandlerFactory(
+    override val id: String
+): KRegistrable {
+    abstract fun create(plugin: EcoSpigotPlugin): PersistentDataHandler
+}
+
+object PersistentDataHandlers: Registry<PersistentDataHandlerFactory>() {
+    init {
+        register(object : PersistentDataHandlerFactory("yaml") {
+            override fun create(plugin: EcoSpigotPlugin) =
+                YamlPersistentDataHandler(plugin)
+        })
+
+        register(object : PersistentDataHandlerFactory("mysql") {
+            override fun create(plugin: EcoSpigotPlugin) =
+                MySQLPersistentDataHandler(plugin.configYml.getSubsection("mysql"))
+        })
+
+        register(object : PersistentDataHandlerFactory("mongodb") {
+            override fun create(plugin: EcoSpigotPlugin) =
+                MongoDBPersistentDataHandler(plugin.configYml.getSubsection("mongodb"))
+        })
+
+        // Configs should also accept "mongo"
+        register(object : PersistentDataHandlerFactory("mongo") {
+            override fun create(plugin: EcoSpigotPlugin) =
+                MongoDBPersistentDataHandler(plugin.configYml.getSubsection("mongodb"))
+        })
+    }
+}

eco-core/core-plugin/src/main/kotlin/com/willfp/eco/internal/spigot/data/handlers/impl/LegacyMongoDBPersistentDataHandler.kt

@@ -0,0 +1,142 @@
+package com.willfp.eco.internal.spigot.data.handlers.impl
+
+import com.mongodb.MongoClientSettings
+import com.mongodb.client.model.Filters
+import com.mongodb.kotlin.client.coroutine.MongoClient
+import com.willfp.eco.core.config.Configs
+import com.willfp.eco.core.config.interfaces.Config
+import com.willfp.eco.core.data.handlers.DataTypeSerializer
+import com.willfp.eco.core.data.handlers.PersistentDataHandler
+import com.willfp.eco.core.data.keys.PersistentDataKey
+import com.willfp.eco.core.data.keys.PersistentDataKeyType
+import com.willfp.eco.internal.spigot.EcoSpigotPlugin
+import com.willfp.eco.internal.spigot.data.handlers.PersistentDataHandlerFactory
+import kotlinx.coroutines.flow.firstOrNull
+import kotlinx.coroutines.flow.toList
+import kotlinx.coroutines.runBlocking
+import org.bson.BsonArray
+import org.bson.BsonBoolean
+import org.bson.BsonDecimal128
+import org.bson.BsonDocument
+import org.bson.BsonDouble
+import org.bson.BsonInt32
+import org.bson.BsonString
+import org.bson.BsonValue
+import org.bson.codecs.configuration.CodecRegistries
+import org.bson.codecs.pojo.PojoCodecProvider
+import java.math.BigDecimal
+import java.util.UUID
+
+class LegacyMongoDBPersistentDataHandler(
+    config: Config
+) : PersistentDataHandler("legacy_mongodb") {
+    private val codecRegistry = CodecRegistries.fromRegistries(
+        MongoClientSettings.getDefaultCodecRegistry(),
+        CodecRegistries.fromProviders(PojoCodecProvider.builder().automatic(true).build())
+    )
+
+    private val client = MongoClient.create(config.getString("url"))
+    private val database = client.getDatabase(config.getString("database"))
+
+    private val collection = database.getCollection<BsonDocument>("uuidprofile")
+        .withCodecRegistry(codecRegistry)
+
+    init {
+        PersistentDataKeyType.STRING.registerSerializer(this, object : LegacyMongoSerializer<String>() {
+            override fun deserialize(value: BsonValue): String {
+                return value.asString().value
+            }
+        })
+
+        PersistentDataKeyType.BOOLEAN.registerSerializer(this, object : LegacyMongoSerializer<Boolean>() {
+            override fun deserialize(value: BsonValue): Boolean {
+                return value.asBoolean().value
+            }
+        })
+
+        PersistentDataKeyType.INT.registerSerializer(this, object : LegacyMongoSerializer<Int>() {
+            override fun deserialize(value: BsonValue): Int {
+                return value.asInt32().value
+            }
+        })
+
+        PersistentDataKeyType.DOUBLE.registerSerializer(this, object : LegacyMongoSerializer<Double>() {
+            override fun deserialize(value: BsonValue): Double {
+                return value.asDouble().value
+            }
+        })
+
+        PersistentDataKeyType.STRING_LIST.registerSerializer(this, object : LegacyMongoSerializer<List<String>>() {
+            override fun deserialize(value: BsonValue): List<String> {
+                return value.asArray().values.map { it.asString().value }
+            }
+        })
+
+        PersistentDataKeyType.BIG_DECIMAL.registerSerializer(this, object : LegacyMongoSerializer<BigDecimal>() {
+            override fun deserialize(value: BsonValue): BigDecimal {
+                return value.asDecimal128().value.bigDecimalValue()
+            }
+        })
+
+        PersistentDataKeyType.CONFIG.registerSerializer(this, object : LegacyMongoSerializer<Config>() {
+            private fun deserializeConfigValue(value: BsonValue): Any {
+                return when (value) {
+                    is BsonString -> value.value
+                    is BsonInt32 -> value.value
+                    is BsonDouble -> value.value
+                    is BsonBoolean -> value.value
+                    is BsonDecimal128 -> value.value.bigDecimalValue()
+                    is BsonArray -> value.values.map { deserializeConfigValue(it) }
+                    is BsonDocument -> value.mapValues { (_, v) -> deserializeConfigValue(v) }
+
+                    else -> throw IllegalArgumentException("Could not deserialize config value type ${value::class.simpleName}")
+                }
+            }
+
+            override fun deserialize(value: BsonValue): Config {
+                @Suppress("UNCHECKED_CAST")
+                return Configs.fromMap(deserializeConfigValue(value.asDocument()) as Map<String, Any>)
+            }
+        })
+    }
+
+    override fun getSavedUUIDs(): Set<UUID> {
+        return runBlocking {
+            collection.find().toList().map {
+                UUID.fromString(it.getString("_id").value)
+            }.toSet()
+        }
+    }
+
+    private abstract inner class LegacyMongoSerializer<T : Any> : DataTypeSerializer<T>() {
+        override fun readAsync(uuid: UUID, key: PersistentDataKey<T>): T? {
+            return runBlocking {
+                val filter = Filters.eq("_id", uuid.toString())
+
+                val profile = collection.find(filter)
+                    .firstOrNull() ?: return@runBlocking null
+
+                val dataMap = profile.getDocument("data")
+                val value = dataMap[key.key.toString()] ?: return@runBlocking null
+
+                try {
+                    return@runBlocking deserialize(value)
+                } catch (e: Exception) {
+                    null
+                }
+            }
+        }
+
+        override fun writeAsync(uuid: UUID, key: PersistentDataKey<T>, value: T) {
+            throw UnsupportedOperationException("Legacy Mongo does not support writing")
+        }
+
+        protected abstract fun deserialize(value: BsonValue): T
+    }
+
+    object Factory: PersistentDataHandlerFactory("legacy_mongo") {
+        override fun create(plugin: EcoSpigotPlugin): PersistentDataHandler {
+            return LegacyMongoDBPersistentDataHandler(plugin.configYml.getSubsection("mongodb"))
+        }
+    }
+}

eco-core/core-plugin/src/main/kotlin/com/willfp/eco/internal/spigot/data/handlers/impl/LegacyMySQLPersistentDataHandler.kt

@@ -0,0 +1,106 @@
+package com.willfp.eco.internal.spigot.data.handlers.impl
+
+import com.willfp.eco.core.config.ConfigType
+import com.willfp.eco.core.config.interfaces.Config
+import com.willfp.eco.core.config.readConfig
+import com.willfp.eco.core.data.handlers.DataTypeSerializer
+import com.willfp.eco.core.data.handlers.PersistentDataHandler
+import com.willfp.eco.core.data.keys.PersistentDataKey
+import com.willfp.eco.core.data.keys.PersistentDataKeyType
+import com.willfp.eco.internal.spigot.EcoSpigotPlugin
+import com.willfp.eco.internal.spigot.data.handlers.PersistentDataHandlerFactory
+import com.zaxxer.hikari.HikariConfig
+import com.zaxxer.hikari.HikariDataSource
+import org.jetbrains.exposed.dao.id.UUIDTable
+import org.jetbrains.exposed.sql.Database
+import org.jetbrains.exposed.sql.SchemaUtils
+import org.jetbrains.exposed.sql.selectAll
+import org.jetbrains.exposed.sql.transactions.transaction
+import java.math.BigDecimal
+import java.util.UUID
+
+class LegacyMySQLPersistentDataHandler(
+    config: Config
+) : PersistentDataHandler("legacy_mysql") {
+    private val dataSource = HikariDataSource(HikariConfig().apply {
+        driverClassName = "com.mysql.cj.jdbc.Driver"
+        username = config.getString("user")
+        password = config.getString("password")
+        jdbcUrl = "jdbc:mysql://" +
+                "${config.getString("host")}:" +
+                "${config.getString("port")}/" +
+                config.getString("database")
+        maximumPoolSize = config.getInt("connections")
+    })
+
+    private val database = Database.connect(dataSource)
+
+    private val table = object : UUIDTable("eco_data") {
+        val data = text("json_data", eagerLoading = true)
+    }
+
+    init {
+        transaction(database) {
+            SchemaUtils.create(table)
+        }
+
+        PersistentDataKeyType.STRING.registerSerializer(this, LegacyMySQLSerializer<String>())
+        PersistentDataKeyType.BOOLEAN.registerSerializer(this, LegacyMySQLSerializer<Boolean>())
+        PersistentDataKeyType.INT.registerSerializer(this, LegacyMySQLSerializer<Int>())
+        PersistentDataKeyType.DOUBLE.registerSerializer(this, LegacyMySQLSerializer<Double>())
+        PersistentDataKeyType.BIG_DECIMAL.registerSerializer(this, LegacyMySQLSerializer<BigDecimal>())
+        PersistentDataKeyType.CONFIG.registerSerializer(this, LegacyMySQLSerializer<Config>())
+        PersistentDataKeyType.STRING_LIST.registerSerializer(this, LegacyMySQLSerializer<List<String>>())
+    }
+
+    override fun getSavedUUIDs(): Set<UUID> {
+        return transaction(database) {
+            table.selectAll()
+                .map { it[table.id] }
+                .toSet()
+        }.map { it.value }.toSet()
+    }
+
+    private inner class LegacyMySQLSerializer<T : Any> : DataTypeSerializer<T>() {
+        override fun readAsync(uuid: UUID, key: PersistentDataKey<T>): T? {
+            val json = transaction(database) {
+                table.selectAll()
+                    .where { table.id eq uuid }
+                    .limit(1)
+                    .singleOrNull()
+                    ?.get(table.data)
+            }
+
+            if (json == null) {
+                return null
+            }
+
+            val data = readConfig(json, ConfigType.JSON)
+
+            val value: Any? = when (key.type) {
+                PersistentDataKeyType.INT -> data.getIntOrNull(key.key.toString())
+                PersistentDataKeyType.DOUBLE -> data.getDoubleOrNull(key.key.toString())
+                PersistentDataKeyType.STRING -> data.getStringOrNull(key.key.toString())
+                PersistentDataKeyType.BOOLEAN -> data.getBoolOrNull(key.key.toString())
+                PersistentDataKeyType.STRING_LIST -> data.getStringsOrNull(key.key.toString())
+                PersistentDataKeyType.CONFIG -> data.getSubsectionOrNull(key.key.toString())
+                PersistentDataKeyType.BIG_DECIMAL -> data.getBigDecimalOrNull(key.key.toString())
+
+                else -> null
+            }
+
+            @Suppress("UNCHECKED_CAST")
+            return value as? T?
+        }
+
+        override fun writeAsync(uuid: UUID, key: PersistentDataKey<T>, value: T) {
+            throw UnsupportedOperationException("Legacy MySQL does not support writing")
+        }
+    }
+
+    object Factory: PersistentDataHandlerFactory("legacy_mysql") {
+        override fun create(plugin: EcoSpigotPlugin): PersistentDataHandler {
+            return LegacyMySQLPersistentDataHandler(plugin.configYml.getSubsection("mysql"))
+        }
+    }
+}

eco-core/core-plugin/src/main/kotlin/com/willfp/eco/internal/spigot/data/handlers/impl/MongoDBPersistentDataHandler.kt

@@ -0,0 +1,192 @@
+package com.willfp.eco.internal.spigot.data.handlers.impl
+
+import com.mongodb.MongoClientSettings
+import com.mongodb.client.model.Filters
+import com.mongodb.client.model.ReplaceOptions
+import com.mongodb.kotlin.client.coroutine.MongoClient
+import com.willfp.eco.core.config.Configs
+import com.willfp.eco.core.config.interfaces.Config
+import com.willfp.eco.core.data.handlers.DataTypeSerializer
+import com.willfp.eco.core.data.handlers.PersistentDataHandler
+import com.willfp.eco.core.data.keys.PersistentDataKey
+import com.willfp.eco.core.data.keys.PersistentDataKeyType
+import kotlinx.coroutines.flow.firstOrNull
+import kotlinx.coroutines.flow.toList
+import kotlinx.coroutines.runBlocking
+import org.bson.BsonArray
+import org.bson.BsonBoolean
+import org.bson.BsonDecimal128
+import org.bson.BsonDocument
+import org.bson.BsonDouble
+import org.bson.BsonInt32
+import org.bson.BsonObjectId
+import org.bson.BsonString
+import org.bson.BsonValue
+import org.bson.codecs.configuration.CodecRegistries
+import org.bson.codecs.pojo.PojoCodecProvider
+import org.bson.types.Decimal128
+import java.math.BigDecimal
+import java.util.UUID
+
+class MongoDBPersistentDataHandler(
+    config: Config
+) : PersistentDataHandler("mongo") {
+    private val codecRegistry = CodecRegistries.fromRegistries(
+        MongoClientSettings.getDefaultCodecRegistry(),
+        CodecRegistries.fromProviders(PojoCodecProvider.builder().automatic(true).build())
+    )
+
+    private val client = MongoClient.create(config.getString("url"))
+    private val database = client.getDatabase(config.getString("database"))
+
+    private val collection = database.getCollection<BsonDocument>(config.getString("collection"))
+        .withCodecRegistry(codecRegistry)
+
+    init {
+        PersistentDataKeyType.STRING.registerSerializer(this, object : MongoSerializer<String>() {
+            override fun serialize(value: String): BsonValue {
+                return BsonString(value)
+            }
+
+            override fun deserialize(value: BsonValue): String {
+                return value.asString().value
+            }
+        })
+
+        PersistentDataKeyType.BOOLEAN.registerSerializer(this, object : MongoSerializer<Boolean>() {
+            override fun serialize(value: Boolean): BsonValue {
+                return BsonBoolean(value)
+            }
+
+            override fun deserialize(value: BsonValue): Boolean {
+                return value.asBoolean().value
+            }
+        })
+
+        PersistentDataKeyType.INT.registerSerializer(this, object : MongoSerializer<Int>() {
+            override fun serialize(value: Int): BsonValue {
+                return BsonInt32(value)
+            }
+
+            override fun deserialize(value: BsonValue): Int {
+                return value.asInt32().value
+            }
+        })
+
+        PersistentDataKeyType.DOUBLE.registerSerializer(this, object : MongoSerializer<Double>() {
+            override fun serialize(value: Double): BsonValue {
+                return BsonDouble(value)
+            }
+
+            override fun deserialize(value: BsonValue): Double {
+                return value.asDouble().value
+            }
+        })
+
+        PersistentDataKeyType.STRING_LIST.registerSerializer(this, object : MongoSerializer<List<String>>() {
+            override fun serialize(value: List<String>): BsonValue {
+                return BsonArray(value.map { BsonString(it) })
+            }
+
+            override fun deserialize(value: BsonValue): List<String> {
+                return value.asArray().values.map { it.asString().value }
+            }
+        })
+
+        PersistentDataKeyType.BIG_DECIMAL.registerSerializer(this, object : MongoSerializer<BigDecimal>() {
+            override fun serialize(value: BigDecimal): BsonValue {
+                return BsonDecimal128(Decimal128(value))
+            }
+
+            override fun deserialize(value: BsonValue): BigDecimal {
+                return value.asDecimal128().value.bigDecimalValue()
+            }
+        })
+
+        PersistentDataKeyType.CONFIG.registerSerializer(this, object : MongoSerializer<Config>() {
+            private fun deserializeConfigValue(value: BsonValue): Any {
+                return when (value) {
+                    is BsonString -> value.value
+                    is BsonInt32 -> value.value
+                    is BsonDouble -> value.value
+                    is BsonBoolean -> value.value
+                    is BsonDecimal128 -> value.value.bigDecimalValue()
+                    is BsonArray -> value.values.map { deserializeConfigValue(it) }
+                    is BsonDocument -> value.mapValues { (_, v) -> deserializeConfigValue(v) }
+
+                    else -> throw IllegalArgumentException("Could not deserialize config value type ${value::class.simpleName}")
+                }
+            }
+
+            private fun serializeConfigValue(value: Any): BsonValue {
+                return when (value) {
+                    is String -> BsonString(value)
+                    is Int -> BsonInt32(value)
+                    is Double -> BsonDouble(value)
+                    is Boolean -> BsonBoolean(value)
+                    is BigDecimal -> BsonDecimal128(Decimal128(value))
+                    is List<*> -> BsonArray(value.map { serializeConfigValue(it!!) })
+                    is Map<*, *> -> BsonDocument().apply {
+                        value.forEach { (k, v) -> append(k.toString(), serializeConfigValue(v!!)) }
+                    }
+
+                    else -> throw IllegalArgumentException("Could not serialize config value type ${value::class.simpleName}")
+                }
+            }
+
+            override fun serialize(value: Config): BsonValue {
+                return serializeConfigValue(value.toMap())
+            }
+
+            override fun deserialize(value: BsonValue): Config {
+                @Suppress("UNCHECKED_CAST")
+                return Configs.fromMap(deserializeConfigValue(value.asDocument()) as Map<String, Any>)
+            }
+        })
+    }
+
+    override fun getSavedUUIDs(): Set<UUID> {
+        return runBlocking {
+            collection.find().toList().map {
+                UUID.fromString(it.getString("uuid").value)
+            }.toSet()
+        }
+    }
+
+    private abstract inner class MongoSerializer<T : Any> : DataTypeSerializer<T>() {
+        override fun readAsync(uuid: UUID, key: PersistentDataKey<T>): T? {
+            return runBlocking {
+                val filter = Filters.eq("uuid", uuid.toString())
+
+                val profile = collection.find(filter)
+                    .firstOrNull() ?: return@runBlocking null
+
+                val value = profile[key.key.toString()] ?: return@runBlocking null
+
+                deserialize(value)
+            }
+        }
+
+        override fun writeAsync(uuid: UUID, key: PersistentDataKey<T>, value: T) {
+            runBlocking {
+                val filter = Filters.eq("uuid", uuid.toString())
+
+                val profile = collection.find(filter).firstOrNull()
+                    ?: BsonDocument()
+                        .append("_id", BsonObjectId())
+                        .append("uuid", BsonString(uuid.toString()))
+
+                profile.append(key.key.toString(), serialize(value))
+
+                collection.replaceOne(
+                    filter,
+                    profile,
+                    ReplaceOptions().upsert(true)
+                )
+            }
+        }
+
+        protected abstract fun serialize(value: T): BsonValue
+        protected abstract fun deserialize(value: BsonValue): T
+    }
+}

eco-core/core-plugin/src/main/kotlin/com/willfp/eco/internal/spigot/data/handlers/impl/MySQLPersistentDataHandler.kt

@@ -0,0 +1,267 @@
+package com.willfp.eco.internal.spigot.data.handlers.impl
+
+import com.willfp.eco.core.config.ConfigType
+import com.willfp.eco.core.config.Configs
+import com.willfp.eco.core.config.interfaces.Config
+import com.willfp.eco.core.config.readConfig
+import com.willfp.eco.core.data.handlers.DataTypeSerializer
+import com.willfp.eco.core.data.handlers.PersistentDataHandler
+import com.willfp.eco.core.data.keys.PersistentDataKey
+import com.willfp.eco.core.data.keys.PersistentDataKeyType
+import com.zaxxer.hikari.HikariConfig
+import com.zaxxer.hikari.HikariDataSource
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.runBlocking
+import org.jetbrains.exposed.sql.Column
+import org.jetbrains.exposed.sql.Database
+import org.jetbrains.exposed.sql.SchemaUtils
+import org.jetbrains.exposed.sql.SqlExpressionBuilder.eq
+import org.jetbrains.exposed.sql.SqlExpressionBuilder.greaterEq
+import org.jetbrains.exposed.sql.Table
+import org.jetbrains.exposed.sql.and
+import org.jetbrains.exposed.sql.deleteWhere
+import org.jetbrains.exposed.sql.replace
+import org.jetbrains.exposed.sql.selectAll
+import org.jetbrains.exposed.sql.transactions.transaction
+import org.jetbrains.exposed.sql.upsert
+import java.math.BigDecimal
+import java.util.UUID
+import kotlin.math.pow
+
+private const val VALUE_COLUMN_NAME = "dataValue"
+private const val UUID_COLUMN_NAME = "profileUUID"
+private const val KEY_COLUMN_NAME = "dataKey"
+private const val INDEX_COLUMN_NAME = "listIndex"
+
+class MySQLPersistentDataHandler(
+    config: Config
+) : PersistentDataHandler("mysql") {
+    private val dataSource = HikariDataSource(HikariConfig().apply {
+        driverClassName = "com.mysql.cj.jdbc.Driver"
+        username = config.getString("user")
+        password = config.getString("password")
+        jdbcUrl = "jdbc:mysql://" +
+                "${config.getString("host")}:" +
+                "${config.getString("port")}/" +
+                config.getString("database")
+        maximumPoolSize = config.getInt("connections")
+    })
+
+    private val prefix = config.getString("prefix")
+
+    private val database = Database.connect(dataSource)
+
+    init {
+        PersistentDataKeyType.STRING.registerSerializer(this, object : DirectStoreSerializer<String>() {
+            override val table = object : KeyTable<String>("string") {
+                override val value = varchar(VALUE_COLUMN_NAME, 256)
+            }
+        }.createTable())
+
+        PersistentDataKeyType.BOOLEAN.registerSerializer(this, object : DirectStoreSerializer<Boolean>() {
+            override val table = object : KeyTable<Boolean>("boolean") {
+                override val value = bool(VALUE_COLUMN_NAME)
+            }
+        }.createTable())
+
+        PersistentDataKeyType.INT.registerSerializer(this, object : DirectStoreSerializer<Int>() {
+            override val table = object : KeyTable<Int>("int") {
+                override val value = integer(VALUE_COLUMN_NAME)
+            }
+        }.createTable())
+
+        PersistentDataKeyType.DOUBLE.registerSerializer(this, object : DirectStoreSerializer<Double>() {
+            override val table = object : KeyTable<Double>("double") {
+                override val value = double(VALUE_COLUMN_NAME)
+            }
+        }.createTable())
+
+        PersistentDataKeyType.BIG_DECIMAL.registerSerializer(this, object : DirectStoreSerializer<BigDecimal>() {
+            override val table = object : KeyTable<BigDecimal>("big_decimal") {
+                // 34 digits of precision, 4 digits of scale
+                override val value = decimal(VALUE_COLUMN_NAME, 34, 4)
+            }
+        }.createTable())
+
+        PersistentDataKeyType.CONFIG.registerSerializer(this, object : SingleValueSerializer<Config, String>() {
+            override val table = object : KeyTable<String>("config") {
+                override val value = text(VALUE_COLUMN_NAME)
+            }
+
+            override fun convertFromStored(value: String): Config {
+                return readConfig(value, ConfigType.JSON)
+            }
+
+            override fun convertToStored(value: Config): String {
+                // Store config as JSON
+                return if (value.type == ConfigType.JSON) {
+                    value.toPlaintext()
+                } else {
+                    Configs.fromMap(value.toMap(), ConfigType.JSON).toPlaintext()
+                }
+            }
+        }.createTable())
+
+        PersistentDataKeyType.STRING_LIST.registerSerializer(this, object : MultiValueSerializer<String>() {
+            override val table = object : ListKeyTable<String>("string_list") {
+                override val value = varchar(VALUE_COLUMN_NAME, 256)
+            }
+        }.createTable())
+    }
+
+    override fun getSavedUUIDs(): Set<UUID> {
+        val savedUUIDs = mutableSetOf<UUID>()
+
+        for (keyType in PersistentDataKeyType.values()) {
+            val serializer = keyType.getSerializer(this) as MySQLSerializer<*>
+            savedUUIDs.addAll(serializer.getSavedUUIDs())
+        }
+
+        return savedUUIDs
+    }
+
+    private abstract inner class MySQLSerializer<T : Any> : DataTypeSerializer<T>() {
+        protected abstract val table: ProfileTable
+
+        fun getSavedUUIDs(): Set<UUID> {
+            return transaction(database) {
+                table.selectAll().map { it[table.uuid] }.toSet()
+            }
+        }
+
+        fun createTable(): MySQLSerializer<T> {
+            transaction(database) {
+                SchemaUtils.create(table)
+            }
+
+            return this
+        }
+    }
+
+    // T is the key type
+    // S is the stored value type
+    private abstract inner class SingleValueSerializer<T : Any, S : Any> : MySQLSerializer<T>() {
+        abstract override val table: KeyTable<S>
+
+        abstract fun convertToStored(value: T): S
+        abstract fun convertFromStored(value: S): T
+
+        override fun readAsync(uuid: UUID, key: PersistentDataKey<T>): T? {
+            val stored = transaction(database) {
+                table.selectAll()
+                    .where { (table.uuid eq uuid) and (table.key eq key.key.toString()) }
+                    .limit(1)
+                    .singleOrNull()
+                    ?.get(table.value)
+            }
+
+            return stored?.let { convertFromStored(it) }
+        }
+
+        override fun writeAsync(uuid: UUID, key: PersistentDataKey<T>, value: T) {
+            withRetries {
+                transaction(database) {
+                    table.upsert {
+                        it[table.uuid] = uuid
+                        it[table.key] = key.key.toString()
+                        it[table.value] = convertToStored(value)
+                    }
+                }
+            }
+        }
+    }
+
+    private abstract inner class DirectStoreSerializer<T : Any> : SingleValueSerializer<T, T>() {
+        override fun convertToStored(value: T): T {
+            return value
+        }
+
+        override fun convertFromStored(value: T): T {
+            return value
+        }
+    }
+
+    private abstract inner class MultiValueSerializer<T : Any> : MySQLSerializer<List<T>>() {
+        abstract override val table: ListKeyTable<T>
+
+        override fun readAsync(uuid: UUID, key: PersistentDataKey<List<T>>): List<T>? {
+            val stored = transaction(database) {
+                table.selectAll()
+                    .where { (table.uuid eq uuid) and (table.key eq key.key.toString()) }
+                    .orderBy(table.index)
+                    .map { it[table.value] }
+            }
+
+            return stored
+        }
+
+        override fun writeAsync(uuid: UUID, key: PersistentDataKey<List<T>>, value: List<T>) {
+            withRetries {
+                transaction(database) {
+                    // Remove existing values greater than the new list size
+                    table.deleteWhere {
+                        (table.uuid eq uuid) and
+                                (table.key eq key.key.toString()) and
+                                (table.index greaterEq value.size)
+                    }
+
+                    // Replace existing values in bounds
+                    value.forEachIndexed { index, t ->
+                        table.replace {
+                            it[table.uuid] = uuid
+                            it[table.key] = key.key.toString()
+                            it[table.index] = index
+                            it[table.value] = t
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    private abstract inner class ProfileTable(name: String) : Table(prefix + name) {
+        val uuid = uuid(UUID_COLUMN_NAME)
+    }
+
+    private abstract inner class KeyTable<T>(name: String) : ProfileTable(name) {
+        val key = varchar(KEY_COLUMN_NAME, 128)
+        abstract val value: Column<T>
+
+        override val primaryKey = PrimaryKey(uuid, key)
+
+        init {
+            uniqueIndex(uuid, key)
+        }
+    }
+
+    private abstract inner class ListKeyTable<T>(name: String) : ProfileTable(name) {
+        val key = varchar(KEY_COLUMN_NAME, 128)
+        val index = integer(INDEX_COLUMN_NAME)
+        abstract val value: Column<T>
+
+        override val primaryKey = PrimaryKey(uuid, key, index)
+
+        init {
+            uniqueIndex(uuid, key, index)
+        }
+    }
+
+    private inline fun <T> withRetries(action: () -> T): T? {
+        var retries = 1
+        while (true) {
+            try {
+                return action()
+            } catch (e: Exception) {
+                if (retries > 5) {
+                    return null
+                }
+                retries++
+
+                // Exponential backoff
+                runBlocking {
+                    delay(2.0.pow(retries.toDouble()).toLong())
+                }
+            }
+        }
+    }
+}

eco-core/core-plugin/src/main/kotlin/com/willfp/eco/internal/spigot/data/handlers/impl/YamlPersistentDataHandler.kt

@@ -0,0 +1,72 @@
+package com.willfp.eco.internal.spigot.data.handlers.impl
+
+import com.willfp.eco.core.config.interfaces.Config
+import com.willfp.eco.core.data.handlers.DataTypeSerializer
+import com.willfp.eco.core.data.handlers.PersistentDataHandler
+import com.willfp.eco.core.data.keys.PersistentDataKey
+import com.willfp.eco.core.data.keys.PersistentDataKeyType
+import com.willfp.eco.internal.spigot.EcoSpigotPlugin
+import java.math.BigDecimal
+import java.util.UUID
+
+class YamlPersistentDataHandler(
+    plugin: EcoSpigotPlugin
+) : PersistentDataHandler("yaml") {
+    private val dataYml = plugin.dataYml
+
+    init {
+        PersistentDataKeyType.STRING.registerSerializer(this, object : YamlSerializer<String>() {
+            override fun read(config: Config, key: String) = config.getStringOrNull(key)
+        })
+
+        PersistentDataKeyType.BOOLEAN.registerSerializer(this, object : YamlSerializer<Boolean>() {
+            override fun read(config: Config, key: String) = config.getBoolOrNull(key)
+        })
+
+        PersistentDataKeyType.INT.registerSerializer(this, object : YamlSerializer<Int>() {
+            override fun read(config: Config, key: String) = config.getIntOrNull(key)
+        })
+
+        PersistentDataKeyType.DOUBLE.registerSerializer(this, object : YamlSerializer<Double>() {
+            override fun read(config: Config, key: String) = config.getDoubleOrNull(key)
+        })
+
+        PersistentDataKeyType.STRING_LIST.registerSerializer(this, object : YamlSerializer<List<String>>() {
+            override fun read(config: Config, key: String) = config.getStringsOrNull(key)
+        })
+
+        PersistentDataKeyType.CONFIG.registerSerializer(this, object : YamlSerializer<Config>() {
+            override fun read(config: Config, key: String) = config.getSubsectionOrNull(key)
+        })
+
+        PersistentDataKeyType.BIG_DECIMAL.registerSerializer(this, object : YamlSerializer<BigDecimal>() {
+            override fun read(config: Config, key: String) = config.getBigDecimalOrNull(key)
+        })
+    }
+
+    override fun getSavedUUIDs(): Set<UUID> {
+        return dataYml.getSubsection("player").getKeys(false)
+            .map { UUID.fromString(it) }
+            .toSet()
+    }
+
+    override fun shouldAutosave(): Boolean {
+        return true
+    }
+
+    override fun doSave() {
+        dataYml.save()
+    }
+
+    private abstract inner class YamlSerializer<T: Any>: DataTypeSerializer<T>() {
+        protected abstract fun read(config: Config, key: String): T?
+
+        final override fun readAsync(uuid: UUID, key: PersistentDataKey<T>): T? {
+            return read(dataYml, "player.$uuid.${key.key}")
+        }
+
+        final override fun writeAsync(uuid: UUID, key: PersistentDataKey<T>, value: T) {
+            dataYml.set("player.$uuid.${key.key}", value)
+        }
+    }
+}

eco-core/core-plugin/src/main/kotlin/com/willfp/eco/internal/spigot/data/profiles/ProfileHandler.kt

@@ -0,0 +1,141 @@
+package com.willfp.eco.internal.spigot.data.profiles
+
+import com.willfp.eco.internal.spigot.EcoSpigotPlugin
+import com.willfp.eco.internal.spigot.ServerLocking
+import com.willfp.eco.internal.spigot.data.KeyRegistry
+import com.willfp.eco.internal.spigot.data.handlers.PersistentDataHandlerFactory
+import com.willfp.eco.internal.spigot.data.handlers.PersistentDataHandlers
+import com.willfp.eco.internal.spigot.data.handlers.impl.LegacyMongoDBPersistentDataHandler
+import com.willfp.eco.internal.spigot.data.handlers.impl.LegacyMySQLPersistentDataHandler
+import com.willfp.eco.internal.spigot.data.handlers.impl.MongoDBPersistentDataHandler
+import com.willfp.eco.internal.spigot.data.handlers.impl.MySQLPersistentDataHandler
+import com.willfp.eco.internal.spigot.data.handlers.impl.YamlPersistentDataHandler
+import com.willfp.eco.internal.spigot.data.profiles.impl.EcoPlayerProfile
+import com.willfp.eco.internal.spigot.data.profiles.impl.EcoProfile
+import com.willfp.eco.internal.spigot.data.profiles.impl.EcoServerProfile
+import com.willfp.eco.internal.spigot.data.profiles.impl.serverProfileUUID
+import java.util.UUID
+import java.util.concurrent.ConcurrentHashMap
+
+const val LEGACY_MIGRATED_KEY = "legacy-data-migrated"
+
+class ProfileHandler(
+    private val plugin: EcoSpigotPlugin
+) {
+    private val handlerId = plugin.configYml.getString("data-handler")
+
+    val localHandler = YamlPersistentDataHandler(plugin)
+    val defaultHandler = PersistentDataHandlers[handlerId]?.create(plugin)
+        ?: throw IllegalArgumentException("Invalid data handler ($handlerId)")
+
+    val profileWriter = ProfileWriter(plugin, this)
+
+    private val loaded = ConcurrentHashMap<UUID, EcoProfile>()
+
+    fun getPlayerProfile(uuid: UUID): EcoPlayerProfile {
+        return loaded.computeIfAbsent(uuid) {
+            EcoPlayerProfile(it, this)
+        } as EcoPlayerProfile
+    }
+
+    fun getServerProfile(): EcoServerProfile {
+        return loaded.computeIfAbsent(serverProfileUUID) {
+            EcoServerProfile(this)
+        } as EcoServerProfile
+    }
+
+    fun unloadProfile(uuid: UUID) {
+        loaded.remove(uuid)
+    }
+
+    fun save() {
+        localHandler.shutdown()
+        defaultHandler.shutdown()
+    }
+
+    fun migrateIfNecessary(): Boolean {
+        if (!plugin.configYml.getBool("perform-data-migration")) {
+            return false
+        }
+
+        // First install
+        if (!plugin.dataYml.has("previous-handler")) {
+            plugin.dataYml.set("previous-handler", defaultHandler.id)
+            plugin.dataYml.set(LEGACY_MIGRATED_KEY, true)
+            plugin.dataYml.save()
+            return false
+        }
+
+        val previousHandlerId = plugin.dataYml.getString("previous-handler").lowercase()
+        if (previousHandlerId != defaultHandler.id) {
+            val fromFactory = PersistentDataHandlers[previousHandlerId] ?: return false
+            scheduleMigration(fromFactory)
+
+            return true
+        }
+
+        if (defaultHandler is MySQLPersistentDataHandler && !plugin.dataYml.getBool(LEGACY_MIGRATED_KEY)) {
+            plugin.logger.info("eco has detected a legacy MySQL database. Migrating to new MySQL database...")
+            scheduleMigration(LegacyMySQLPersistentDataHandler.Factory)
+
+            return true
+        }
+
+        if (defaultHandler is MongoDBPersistentDataHandler && !plugin.dataYml.getBool(LEGACY_MIGRATED_KEY)) {
+            plugin.logger.info("eco has detected a legacy MongoDB database. Migrating to new MongoDB database...")
+            scheduleMigration(LegacyMongoDBPersistentDataHandler.Factory)
+
+            return true
+        }
+
+        return false
+    }
+
+    private fun scheduleMigration(fromFactory: PersistentDataHandlerFactory) {
+        ServerLocking.lock("Migrating player data! Check console for more information.")
+
+        // Run after 5 ticks to allow plugins to load their data keys
+        plugin.scheduler.runLater(5) {
+            doMigrate(fromFactory)
+
+            plugin.dataYml.set(LEGACY_MIGRATED_KEY, true)
+            plugin.dataYml.save()
+        }
+    }
+
+    private fun doMigrate(fromFactory: PersistentDataHandlerFactory) {
+        plugin.logger.info("eco has detected a change in data handler")
+        plugin.logger.info("${fromFactory.id} --> ${defaultHandler.id}")
+        plugin.logger.info("This will take a while! Players will not be able to join during this time.")
+
+        val fromHandler = fromFactory.create(plugin)
+        val toHandler = defaultHandler
+
+        val keys = KeyRegistry.getRegisteredKeys()
+
+        plugin.logger.info("Keys to migrate: ${keys.map { it.key }.joinToString(", ") }}")
+
+        plugin.logger.info("Loading profile UUIDs from ${fromFactory.id}...")
+        plugin.logger.info("This step may take a while depending on the size of your database.")
+
+        val uuids = fromHandler.getSavedUUIDs()
+
+        plugin.logger.info("Found ${uuids.size} profiles to migrate")
+
+        for ((index, uuid) in uuids.withIndex()) {
+            plugin.logger.info("(${index + 1}/${uuids.size}) Migrating $uuid")
+            val profile = fromHandler.serializeProfile(uuid, keys)
+            toHandler.loadSerializedProfile(profile)
+        }
+
+        plugin.logger.info("Profile writes submitted! Waiting for completion...")
+        toHandler.shutdown()
+
+        plugin.logger.info("Updating previous handler...")
+        plugin.dataYml.set("previous-handler", handlerId)
+        plugin.dataYml.save()
+        plugin.logger.info("The server will now automatically be restarted...")
+
+        plugin.server.shutdown()
+    }
+}

eco-core/core-plugin/src/main/kotlin/com/willfp/eco/internal/spigot/data/profiles/ProfileLoadListener.kt

@@ -1,4 +1,4 @@
-package com.willfp.eco.internal.spigot.data
+package com.willfp.eco.internal.spigot.data.profiles
 
 import com.willfp.eco.core.EcoPlugin
 import com.willfp.eco.util.PlayerUtils
@@ -9,15 +9,18 @@ import org.bukkit.event.player.PlayerJoinEvent
 import org.bukkit.event.player.PlayerLoginEvent
 import org.bukkit.event.player.PlayerQuitEvent
 
-class DataListener(
+class ProfileLoadListener(
     private val plugin: EcoPlugin,
     private val handler: ProfileHandler
 ) : Listener {
+    @EventHandler(priority = EventPriority.LOWEST)
+    fun onLogin(event: PlayerLoginEvent) {
+        handler.unloadProfile(event.player.uniqueId)
+    }
+
     @EventHandler(priority = EventPriority.HIGHEST)
     fun onLeave(event: PlayerQuitEvent) {
-        val profile = handler.accessLoadedProfile(event.player.uniqueId) ?: return
-        handler.saveKeysFor(event.player.uniqueId, profile.data.keys)
-        handler.unloadPlayer(event.player.uniqueId)
+        handler.unloadProfile(event.player.uniqueId)
     }
 
     @EventHandler
@@ -26,9 +29,4 @@ class DataListener(
             PlayerUtils.updateSavedDisplayName(event.player)
         }
     }
-
-    @EventHandler(priority = EventPriority.LOWEST)
-    fun onLogin(event: PlayerLoginEvent) {
-        handler.unloadPlayer(event.player.uniqueId)
-    }
 }

eco-core/core-plugin/src/main/kotlin/com/willfp/eco/internal/spigot/data/profiles/ProfileWriter.kt

@@ -0,0 +1,59 @@
+package com.willfp.eco.internal.spigot.data.profiles
+
+import com.willfp.eco.core.EcoPlugin
+import com.willfp.eco.core.data.keys.PersistentDataKey
+import java.util.UUID
+import java.util.concurrent.ConcurrentHashMap
+
+/*
+The profile writer exists as an optimization to batch writes to the database.
+
+This is necessary because values frequently change multiple times per tick,
+and we don't want to write to the database every time a value changes.
+
+Instead, we only commit the last value that was set every interval (default 1 tick).
+ */
+
+
+class ProfileWriter(
+    private val plugin: EcoPlugin,
+    private val handler: ProfileHandler
+) {
+    private val saveInterval = plugin.configYml.getInt("save-interval").toLong()
+    private val autosaveInterval = plugin.configYml.getInt("autosave-interval").toLong()
+    private val valuesToWrite = ConcurrentHashMap<WriteRequest<*>, Any>()
+
+    fun <T : Any> write(uuid: UUID, key: PersistentDataKey<T>, value: T) {
+        valuesToWrite[WriteRequest(uuid, key)] = value
+    }
+
+    fun startTickingSaves() {
+        plugin.scheduler.runTimer(20, saveInterval) {
+            val iterator = valuesToWrite.iterator()
+
+            while (iterator.hasNext()) {
+                val (request, value) = iterator.next()
+                iterator.remove()
+
+                val dataHandler = if (request.key.isSavedLocally) handler.localHandler else handler.defaultHandler
+
+                // Pass the value to the data handler
+                @Suppress("UNCHECKED_CAST")
+                dataHandler.write(request.uuid, request.key as PersistentDataKey<Any>, value)
+            }
+        }
+    }
+
+    fun startTickingAutosave() {
+        plugin.scheduler.runTimer(autosaveInterval, autosaveInterval) {
+            if (handler.localHandler.shouldAutosave()) {
+                handler.localHandler.save()
+            }
+        }
+    }
+
+    private data class WriteRequest<T>(val uuid: UUID, val key: PersistentDataKey<T>)
+}
+
+val PersistentDataKey<*>.isSavedLocally: Boolean
+    get() = this.isLocal || EcoPlugin.getPlugin(this.key.namespace)?.isUsingLocalStorage == true

eco-core/core-plugin/src/main/kotlin/com/willfp/eco/internal/spigot/data/profiles/impl/EcoPlayerProfile.kt

@@ -0,0 +1,14 @@
+package com.willfp.eco.internal.spigot.data.profiles.impl
+
+import com.willfp.eco.core.data.PlayerProfile
+import com.willfp.eco.internal.spigot.data.profiles.ProfileHandler
+import java.util.UUID
+
+class EcoPlayerProfile(
+    uuid: UUID,
+    handler: ProfileHandler
+) : EcoProfile(uuid, handler), PlayerProfile {
+    override fun toString(): String {
+        return "EcoPlayerProfile{uuid=$uuid}"
+    }
+}

eco-core/core-plugin/src/main/kotlin/com/willfp/eco/internal/spigot/data/profiles/impl/EcoProfile.kt

@@ -0,0 +1,48 @@
+package com.willfp.eco.internal.spigot.data.profiles.impl
+
+import com.willfp.eco.core.data.Profile
+import com.willfp.eco.core.data.keys.PersistentDataKey
+import com.willfp.eco.internal.spigot.data.profiles.ProfileHandler
+import com.willfp.eco.internal.spigot.data.profiles.isSavedLocally
+import java.util.UUID
+import java.util.concurrent.ConcurrentHashMap
+
+abstract class EcoProfile(
+    val uuid: UUID,
+    private val handler: ProfileHandler
+) : Profile {
+    private val data = ConcurrentHashMap<PersistentDataKey<*>, Any>()
+
+    override fun <T : Any> write(key: PersistentDataKey<T>, value: T) {
+        this.data[key] = value
+
+        handler.profileWriter.write(uuid, key, value)
+    }
+
+    override fun <T : Any> read(key: PersistentDataKey<T>): T {
+        @Suppress("UNCHECKED_CAST")
+        if (this.data.containsKey(key)) {
+            return this.data[key] as T
+        }
+
+        this.data[key] = if (key.isSavedLocally) {
+            handler.localHandler.read(uuid, key)
+        } else {
+            handler.defaultHandler.read(uuid, key)
+        } ?: key.defaultValue
+
+        return read(key)
+    }
+
+    override fun equals(other: Any?): Boolean {
+        if (other !is EcoProfile) {
+            return false
+        }
+
+        return this.uuid == other.uuid
+    }
+
+    override fun hashCode(): Int {
+        return this.uuid.hashCode()
+    }
+}

eco-core/core-plugin/src/main/kotlin/com/willfp/eco/internal/spigot/data/profiles/impl/EcoServerProfile.kt

@@ -0,0 +1,47 @@
+package com.willfp.eco.internal.spigot.data.profiles.impl
+
+import com.willfp.eco.core.data.ServerProfile
+import com.willfp.eco.core.data.keys.PersistentDataKey
+import com.willfp.eco.core.data.keys.PersistentDataKeyType
+import com.willfp.eco.internal.spigot.data.profiles.ProfileHandler
+import com.willfp.eco.util.namespacedKeyOf
+import java.util.UUID
+
+val serverIDKey = PersistentDataKey(
+    namespacedKeyOf("eco", "server_id"),
+    PersistentDataKeyType.STRING,
+    ""
+)
+
+val localServerIDKey = PersistentDataKey(
+    namespacedKeyOf("eco", "local_server_id"),
+    PersistentDataKeyType.STRING,
+    "",
+    true
+)
+
+val serverProfileUUID = UUID(0, 0)
+
+class EcoServerProfile(
+    handler: ProfileHandler
+) : EcoProfile(serverProfileUUID, handler), ServerProfile {
+    override fun getServerID(): String {
+        if (this.read(serverIDKey).isBlank()) {
+            this.write(serverIDKey, UUID.randomUUID().toString())
+        }
+
+        return this.read(serverIDKey)
+    }
+
+    override fun getLocalServerID(): String {
+        if (this.read(localServerIDKey).isBlank()) {
+            this.write(localServerIDKey, UUID.randomUUID().toString())
+        }
+
+        return this.read(localServerIDKey)
+    }
+
+    override fun toString(): String {
+        return "EcoServerProfile"
+    }
+}

eco-core/core-plugin/src/main/kotlin/com/willfp/eco/internal/spigot/data/storage/DataHandler.kt

@@ -1,37 +0,0 @@
-package com.willfp.eco.internal.spigot.data.storage
-
-import com.willfp.eco.core.data.keys.PersistentDataKey
-import java.util.UUID
-
-abstract class DataHandler(
-    val type: HandlerType
-) {
-    /**
-     * Read value from a key.
-     */
-    abstract fun <T : Any> read(uuid: UUID, key: PersistentDataKey<T>): T?
-
-    /**
-     * Write value to a key.
-     */
-    abstract fun <T : Any> write(uuid: UUID, key: PersistentDataKey<T>, value: T)
-
-    /**
-     * Save a set of keys for a given UUID.
-     */
-    abstract fun saveKeysFor(uuid: UUID, keys: Map<PersistentDataKey<*>, Any>)
-
-    // Everything below this are methods that are only needed for certain implementations.
-
-    open fun save() {
-
-    }
-
-    open fun saveAsync() {
-
-    }
-
-    open fun initialize() {
-
-    }
-}

eco-core/core-plugin/src/main/kotlin/com/willfp/eco/internal/spigot/data/storage/HandlerType.kt

@@ -1,7 +0,0 @@
-package com.willfp.eco.internal.spigot.data.storage
-
-enum class HandlerType {
-    YAML,
-    MYSQL,
-    MONGO
-}

eco-core/core-plugin/src/main/kotlin/com/willfp/eco/internal/spigot/data/storage/MongoDataHandler.kt

@@ -1,134 +0,0 @@
-package com.willfp.eco.internal.spigot.data.storage
-
-import com.mongodb.client.model.Filters
-import com.mongodb.client.model.ReplaceOptions
-import com.mongodb.client.model.UpdateOptions
-import com.mongodb.client.model.Updates
-import com.mongodb.kotlin.client.coroutine.MongoClient
-import com.mongodb.kotlin.client.coroutine.MongoCollection
-import com.willfp.eco.core.data.keys.PersistentDataKey
-import com.willfp.eco.internal.spigot.EcoSpigotPlugin
-import com.willfp.eco.internal.spigot.data.ProfileHandler
-import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.launch
-import kotlinx.coroutines.runBlocking
-import org.bson.codecs.pojo.annotations.BsonId
-import java.util.UUID
-import kotlinx.coroutines.flow.firstOrNull
-import kotlinx.serialization.Contextual
-import kotlinx.serialization.SerialName
-import kotlinx.serialization.Serializable
-import org.bukkit.Bukkit
-
-@Suppress("UNCHECKED_CAST")
-class MongoDataHandler(
-    plugin: EcoSpigotPlugin,
-    private val handler: ProfileHandler
-) : DataHandler(HandlerType.MONGO) {
-    private val client: MongoClient
-    private val collection: MongoCollection<UUIDProfile>
-
-    private val scope = CoroutineScope(Dispatchers.IO)
-
-    init {
-        System.setProperty(
-            "org.litote.mongo.mapping.service",
-            "org.litote.kmongo.jackson.JacksonClassMappingTypeService"
-        )
-
-        val url = plugin.configYml.getString("mongodb.url")
-
-        client = MongoClient.create(url)
-        collection = client.getDatabase(plugin.configYml.getString("mongodb.database"))
-            .getCollection<UUIDProfile>("uuidprofile") // Compat with jackson mapping
-    }
-
-    override fun <T : Any> read(uuid: UUID, key: PersistentDataKey<T>): T? {
-        return runBlocking {
-            doRead(uuid, key)
-        }
-    }
-
-    override fun <T : Any> write(uuid: UUID, key: PersistentDataKey<T>, value: T) {
-        scope.launch {
-            doWrite(uuid, key, value)
-        }
-    }
-
-    override fun saveKeysFor(uuid: UUID, keys: Map<PersistentDataKey<*>, Any>) {
-        scope.launch {
-            for ((key, value) in keys) {
-                saveKey(uuid, key, value)
-            }
-        }
-    }
-
-    private suspend fun <T : Any> saveKey(uuid: UUID, key: PersistentDataKey<T>, value: Any) {
-        val data = value as T
-        doWrite(uuid, key, data)
-    }
-
-    private suspend fun <T> doWrite(uuid: UUID, key: PersistentDataKey<T>, value: T) {
-        val profile = getOrCreateDocument(uuid)
-
-        profile.data.run {
-            if (value == null) {
-                this.remove(key.key.toString())
-            } else {
-                this[key.key.toString()] = value
-            }
-        }
-
-        collection.updateOne(
-            Filters.eq(UUIDProfile::uuid.name, uuid.toString()),
-            Updates.set(UUIDProfile::data.name, profile.data)
-        )
-    }
-
-    private suspend fun <T> doRead(uuid: UUID, key: PersistentDataKey<T>): T? {
-        val profile = collection.find<UUIDProfile>(Filters.eq(UUIDProfile::uuid.name, uuid.toString()))
-            .firstOrNull() ?: return key.defaultValue
-        return profile.data[key.key.toString()] as? T?
-    }
-
-    private suspend fun getOrCreateDocument(uuid: UUID): UUIDProfile {
-        val profile = collection.find<UUIDProfile>(Filters.eq(UUIDProfile::uuid.name, uuid.toString()))
-            .firstOrNull()
-        return if (profile == null) {
-            val toInsert = UUIDProfile(
-                uuid.toString(),
-                mutableMapOf()
-            )
-
-            collection.replaceOne(
-                Filters.eq(UUIDProfile::uuid.name, uuid.toString()),
-                toInsert,
-                ReplaceOptions().upsert(true)
-            )
-            toInsert
-        } else {
-            profile
-        }
-    }
-
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return other is MongoDataHandler
-    }
-
-    override fun hashCode(): Int {
-        return type.hashCode()
-    }
-}
-
-@Serializable
-internal data class UUIDProfile(
-    // Storing UUID as strings for serialization
-    @SerialName("_id") val uuid: String,
-    // Storing NamespacedKeys as strings for serialization
-    val data: MutableMap<String, @Contextual Any>
-)

eco-core/core-plugin/src/main/kotlin/com/willfp/eco/internal/spigot/data/storage/MySQLDataHandler.kt

@@ -1,169 +0,0 @@
-package com.willfp.eco.internal.spigot.data.storage
-
-import com.github.benmanes.caffeine.cache.Caffeine
-import com.google.common.util.concurrent.ThreadFactoryBuilder
-import com.willfp.eco.core.config.ConfigType
-import com.willfp.eco.core.config.interfaces.Config
-import com.willfp.eco.core.config.readConfig
-import com.willfp.eco.core.data.keys.PersistentDataKey
-import com.willfp.eco.core.data.keys.PersistentDataKeyType
-import com.willfp.eco.internal.spigot.EcoSpigotPlugin
-import com.willfp.eco.internal.spigot.data.ProfileHandler
-import com.zaxxer.hikari.HikariConfig
-import com.zaxxer.hikari.HikariDataSource
-import org.jetbrains.exposed.dao.id.UUIDTable
-import org.jetbrains.exposed.sql.Column
-import org.jetbrains.exposed.sql.Database
-import org.jetbrains.exposed.sql.ResultRow
-import org.jetbrains.exposed.sql.SchemaUtils
-import org.jetbrains.exposed.sql.TextColumnType
-import org.jetbrains.exposed.sql.insert
-import org.jetbrains.exposed.sql.select
-import org.jetbrains.exposed.sql.transactions.transaction
-import org.jetbrains.exposed.sql.update
-import java.util.UUID
-import java.util.concurrent.Executors
-import java.util.concurrent.TimeUnit
-
-/*
-Better than old MySQL data handler, but that's only because it's literally just dumping all the
-data into a single text column, containing the contents of the players profile as a Config.
-
-Whatever. At least it works.
- */
-
-@Suppress("UNCHECKED_CAST")
-class MySQLDataHandler(
-    plugin: EcoSpigotPlugin,
-    private val handler: ProfileHandler
-) : DataHandler(HandlerType.MYSQL) {
-    private val database: Database
-    private val table = UUIDTable("eco_data")
-
-    private val rows = Caffeine.newBuilder()
-        .expireAfterWrite(3, TimeUnit.SECONDS)
-        .build<UUID, ResultRow>()
-
-    private val threadFactory = ThreadFactoryBuilder().setNameFormat("eco-mysql-thread-%d").build()
-    private val executor = Executors.newFixedThreadPool(plugin.configYml.getInt("mysql.threads"), threadFactory)
-
-    private val dataColumn: Column<String>
-        get() = table.columns.first { it.name == "json_data" } as Column<String>
-
-    init {
-        val config = HikariConfig()
-        config.driverClassName = "com.mysql.cj.jdbc.Driver"
-        config.username = plugin.configYml.getString("mysql.user")
-        config.password = plugin.configYml.getString("mysql.password")
-        config.jdbcUrl = "jdbc:mysql://" +
-                "${plugin.configYml.getString("mysql.host")}:" +
-                "${plugin.configYml.getString("mysql.port")}/" +
-                plugin.configYml.getString("mysql.database")
-        config.maximumPoolSize = plugin.configYml.getInt("mysql.connections")
-
-        database = Database.connect(HikariDataSource(config))
-
-        transaction(database) {
-            SchemaUtils.create(table)
-
-            table.apply {
-                registerColumn<String>("json_data", TextColumnType())
-            }
-
-            SchemaUtils.createMissingTablesAndColumns(table, withLogs = false)
-        }
-    }
-
-    override fun <T : Any> read(uuid: UUID, key: PersistentDataKey<T>): T? {
-        val data = getData(uuid)
-
-        val value: Any? = when (key.type) {
-            PersistentDataKeyType.INT -> data.getIntOrNull(key.key.toString())
-            PersistentDataKeyType.DOUBLE -> data.getDoubleOrNull(key.key.toString())
-            PersistentDataKeyType.STRING -> data.getStringOrNull(key.key.toString())
-            PersistentDataKeyType.BOOLEAN -> data.getBoolOrNull(key.key.toString())
-            PersistentDataKeyType.STRING_LIST -> data.getStringsOrNull(key.key.toString())
-            PersistentDataKeyType.CONFIG -> data.getSubsectionOrNull(key.key.toString())
-            PersistentDataKeyType.BIG_DECIMAL -> data.getBigDecimalOrNull(key.key.toString())
-
-            else -> null
-        }
-
-        return value as? T?
-    }
-
-    override fun <T : Any> write(uuid: UUID, key: PersistentDataKey<T>, value: T) {
-        val data = getData(uuid)
-        data.set(key.key.toString(), value)
-
-        setData(uuid, data)
-    }
-
-    override fun saveKeysFor(uuid: UUID, keys: Map<PersistentDataKey<*>, Any>) {
-        executor.submit {
-            val data = getData(uuid)
-
-            for ((key, value) in keys) {
-                data.set(key.key.toString(), value)
-            }
-
-            doSetData(uuid, data)
-        }
-    }
-
-    private fun getData(uuid: UUID): Config {
-        val plaintext = transaction(database) {
-            val row = rows.get(uuid) {
-                val row = table.select { table.id eq uuid }.limit(1).singleOrNull()
-
-                if (row != null) {
-                    row
-                } else {
-                    transaction(database) {
-                        table.insert {
-                            it[id] = uuid
-                            it[dataColumn] = "{}"
-                        }
-                    }
-                    table.select { table.id eq uuid }.limit(1).singleOrNull()
-                }
-            }
-
-            row.getOrNull(dataColumn) ?: "{}"
-        }
-
-        return readConfig(plaintext, ConfigType.JSON)
-    }
-
-    private fun setData(uuid: UUID, config: Config) {
-        executor.submit {
-            doSetData(uuid, config)
-        }
-    }
-
-    private fun doSetData(uuid: UUID, config: Config) {
-        transaction(database) {
-            table.update({ table.id eq uuid }) {
-                it[dataColumn] = config.toPlaintext()
-            }
-        }
-    }
-
-    override fun initialize() {
-        transaction(database) {
-            SchemaUtils.createMissingTablesAndColumns(table, withLogs = false)
-        }
-    }
-
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return other is MySQLDataHandler
-    }
-
-    override fun hashCode(): Int {
-        return type.hashCode()
-    }
-}

eco-core/core-plugin/src/main/kotlin/com/willfp/eco/internal/spigot/data/storage/ProfileSaver.kt

@@ -1,27 +0,0 @@
-package com.willfp.eco.internal.spigot.data.storage
-
-import com.willfp.eco.core.EcoPlugin
-import com.willfp.eco.internal.spigot.data.EcoProfile
-import com.willfp.eco.internal.spigot.data.ProfileHandler
-
-class ProfileSaver(
-    private val plugin: EcoPlugin,
-    private val handler: ProfileHandler
-) {
-    fun startTicking() {
-        val interval = plugin.configYml.getInt("save-interval").toLong()
-
-        plugin.scheduler.runTimer(20, interval) {
-            val iterator = EcoProfile.CHANGE_MAP.iterator()
-
-            while (iterator.hasNext()) {
-                val uuid = iterator.next()
-                iterator.remove()
-
-                val profile = handler.accessLoadedProfile(uuid) ?: continue
-
-                handler.saveKeysFor(uuid, profile.data.keys)
-            }
-        }
-    }
-}

eco-core/core-plugin/src/main/kotlin/com/willfp/eco/internal/spigot/data/storage/YamlDataHandler.kt

@@ -1,67 +0,0 @@
-package com.willfp.eco.internal.spigot.data.storage
-
-import com.willfp.eco.core.data.keys.PersistentDataKey
-import com.willfp.eco.core.data.keys.PersistentDataKeyType
-import com.willfp.eco.internal.spigot.EcoSpigotPlugin
-import com.willfp.eco.internal.spigot.data.ProfileHandler
-import org.bukkit.NamespacedKey
-import java.util.UUID
-
-@Suppress("UNCHECKED_CAST")
-class YamlDataHandler(
-    plugin: EcoSpigotPlugin,
-    private val handler: ProfileHandler
-) : DataHandler(HandlerType.YAML) {
-    private val dataYml = plugin.dataYml
-
-    override fun save() {
-        dataYml.save()
-    }
-
-    override fun saveAsync() {
-        dataYml.saveAsync()
-    }
-
-    override fun <T : Any> read(uuid: UUID, key: PersistentDataKey<T>): T? {
-        // Separate `as T?` for each branch to prevent compiler warnings.
-        val value = when (key.type) {
-            PersistentDataKeyType.INT -> dataYml.getIntOrNull("player.$uuid.${key.key}") as T?
-            PersistentDataKeyType.DOUBLE -> dataYml.getDoubleOrNull("player.$uuid.${key.key}") as T?
-            PersistentDataKeyType.STRING -> dataYml.getStringOrNull("player.$uuid.${key.key}") as T?
-            PersistentDataKeyType.BOOLEAN -> dataYml.getBoolOrNull("player.$uuid.${key.key}") as T?
-            PersistentDataKeyType.STRING_LIST -> dataYml.getStringsOrNull("player.$uuid.${key.key}") as T?
-            PersistentDataKeyType.CONFIG -> dataYml.getSubsectionOrNull("player.$uuid.${key.key}") as T?
-            PersistentDataKeyType.BIG_DECIMAL -> dataYml.getBigDecimalOrNull("player.$uuid.${key.key}") as T?
-
-            else -> null
-        }
-
-        return value
-    }
-
-    override fun <T : Any> write(uuid: UUID, key: PersistentDataKey<T>, value: T) {
-        doWrite(uuid, key.key, value)
-    }
-
-    override fun saveKeysFor(uuid: UUID, keys: Map<PersistentDataKey<*>, Any>) {
-        for ((key, value) in keys) {
-            doWrite(uuid, key.key, value)
-        }
-    }
-
-    private fun doWrite(uuid: UUID, key: NamespacedKey, value: Any) {
-        dataYml.set("player.$uuid.$key", value)
-    }
-
-    override fun equals(other: Any?): Boolean {
-        if (this === other) {
-            return true
-        }
-
-        return other is YamlDataHandler
-    }
-
-    override fun hashCode(): Int {
-        return type.hashCode()
-    }
-}

eco-core/core-plugin/src/main/resources/config.yml

@@ -6,8 +6,8 @@
 
 # How player/server data is saved:
 # yaml - Stored in data.yml: Good option for single-node servers (i.e. no BungeeCord/Velocity)
-# mongo - If you're running on a network (Bungee/Velocity), you should use MongoDB if you can.
-# mysql - The alternative to MongoDB. Because of how eco data works, MongoDB is the best option; but use this if you can't.
+# mysql - Standard database, great option for multi-node servers (i.e. BungeeCord/Velocity)
+# mongodb - Alternative database, great option for multi-node servers (i.e. BungeeCord/Velocity)
 data-handler: yaml
 
 # If data should be migrated automatically when changing data handler.
@@ -16,25 +16,26 @@ perform-data-migration: true
 mongodb:
   # The full MongoDB connection URL.
   url: ""
+
   # The name of the database to use.
-  database: "eco"
+  database: eco
+
+  # The collection to use for player data.
+  collection: profiles
 
 mysql:
-  # How many threads to execute statements on. Higher numbers can be faster however
-  # very high numbers can cause issues with OS configuration. If writes are taking
-  # too long, increase this value.
-  threads: 2
+  # The table prefix to use for all tables.
+  prefix: "eco_"
+
   # The maximum number of MySQL connections.
   connections: 10
+
+  # Connection details for MySQL.
   host: localhost
   port: 3306
   database: database
   user: username
-  password: passy
-
-yaml:
-  autosave: true # If data should be saved automatically
-  autosave-interval: 1800 # How often data should be saved (in seconds)
+  password: p4ssw0rd
 
 # How many ticks to wait between committing data to a database. This doesn't
 # affect yaml storage, only MySQL and MongoDB. By default, data is committed
@@ -42,6 +43,9 @@ yaml:
 # would be committing once a second.
 save-interval: 1
 
+# How many ticks to wait between autosaves for data.yml.
+autosave-interval: 36000 # 30 minutes
+
 # Options to manage the conflict finder
 conflicts:
   whitelist: # Plugins that should never be marked as conflicts
@@ -101,7 +105,7 @@ math-cache-ttl: 200
 # The time (in minutes) for literal patterns to be cached for. Higher values will lead to
 # faster evaluation times (less CPU usage) at the expense of slightly more memory usage and
 # less reactive values. (Do not change unless you are told to).
-literal-cache-ttl: 1
+literal-cache-ttl: 10
 
 # If anonymous usage statistics should be tracked. This is very valuable information as it
 # helps understand how eco and other plugins are being used by logging player and server

gradle.properties

@@ -1,2 +1,2 @@
-version = 6.73.2
+version = 6.74.0
 kotlin.incremental.useClasspathSnapshot=false