Integration / Scheduling changes

eco-api/src/main/java/com/willfp/eco/core/integrations/IntegrationLoader.java

@@ -1,13 +1,27 @@
 package com.willfp.eco.core.integrations;
 
+import org.bukkit.Bukkit;
+import org.bukkit.plugin.Plugin;
 import org.jetbrains.annotations.NotNull;
 
+import java.util.Arrays;
+import java.util.Set;
+import java.util.stream.Collectors;
+
 /**
  * An integration loader runs a runnable only if a specific plugin is present on the server.
  * <p>
  * Used by {@link com.willfp.eco.core.EcoPlugin} to load integrations.
  */
 public class IntegrationLoader {
+    /**
+     * All loaded plugins on the server.
+     */
+    private static final Set<String> LOADED_PLUGINS = Arrays.stream(Bukkit.getPluginManager().getPlugins())
+            .map(Plugin::getName)
+            .map(String::toLowerCase)
+            .collect(Collectors.toSet());
+
     /**
      * The lambda to be run if the plugin is present.
      */
@@ -30,6 +44,15 @@ public class IntegrationLoader {
         this.pluginName = pluginName;
     }
 
+    /**
+     * Load the integration if the specified plugin is present on the server.
+     */
+    public void loadIfPresent() {
+        if (LOADED_PLUGINS.contains(this.pluginName.toLowerCase())) {
+            this.load();
+        }
+    }
+
     /**
      * Load the integration.
      */

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

@@ -4,6 +4,7 @@ import com.willfp.eco.core.Eco
 import com.willfp.eco.core.EcoPlugin
 import com.willfp.eco.util.PlayerUtils
 import org.bukkit.event.EventHandler
+import org.bukkit.event.EventPriority
 import org.bukkit.event.Listener
 import org.bukkit.event.player.PlayerJoinEvent
 import org.bukkit.event.player.PlayerLoginEvent
@@ -12,19 +13,19 @@ import org.bukkit.event.player.PlayerQuitEvent
 class DataListener(
     private val plugin: EcoPlugin
 ) : Listener {
-    @EventHandler
+    @EventHandler(priority = EventPriority.HIGHEST)
     fun onLeave(event: PlayerQuitEvent) {
         Eco.getHandler().playerProfileHandler.unloadPlayer(event.player.uniqueId)
     }
 
     @EventHandler
     fun onJoin(event: PlayerJoinEvent) {
-        plugin.scheduler.runLater({
+        plugin.scheduler.runLater(5) {
             PlayerUtils.updateSavedDisplayName(event.player)
-        }, 5)
+        }
     }
 
-    @EventHandler
+    @EventHandler(priority = EventPriority.LOWEST)
     fun onLogin(event: PlayerLoginEvent) {
         Eco.getHandler().playerProfileHandler.unloadPlayer(event.player.uniqueId)
     }

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

@@ -30,9 +30,9 @@ class EntityDeathByEntityListeners(
         builtEvent.victim = victim
         builtEvent.damager = event.damager
         events.add(builtEvent)
-        this.plugin.scheduler.runLater({
+        this.plugin.scheduler.run {
             events.remove(builtEvent)
-        }, 1)
+        }
     }
 
     @EventHandler