From 8ceb19a0654719b3e8037e3b7972adcff11c6ff6 Mon Sep 17 00:00:00 2001
From: Dreeam <61569423+Dreeam-qwq@users.noreply.github.com>
Date: Mon, 4 Aug 2025 02:19:03 +0800
Subject: [PATCH] Skip BlockPhysicsEvent if no listeners

---
 ...ip-BlockPhysicsEvent-if-no-listeners.patch | 30 +++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 leaf-server/minecraft-patches/features/0280-Skip-BlockPhysicsEvent-if-no-listeners.patch

diff --git a/leaf-server/minecraft-patches/features/0280-Skip-BlockPhysicsEvent-if-no-listeners.patch b/leaf-server/minecraft-patches/features/0280-Skip-BlockPhysicsEvent-if-no-listeners.patch
new file mode 100644
index 00000000..0d7e7d05
--- /dev/null
+++ b/leaf-server/minecraft-patches/features/0280-Skip-BlockPhysicsEvent-if-no-listeners.patch
@@ -0,0 +1,30 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Dreeam <61569423+Dreeam-qwq@users.noreply.github.com>
+Date: Sun, 3 Aug 2025 22:29:34 +0800
+Subject: [PATCH] Skip BlockPhysicsEvent if no listeners
+
+BlockPhysicsEvent creates new CraftBlock instance and clones CraftBlockData when constructed it.
+It's a defensive programming stratgy and expensive if there are many neighbor updates.
+However, there is no plugin listening to this event sometimes, so that just add a check to not
+call it if no listeners listening to it.
+
+diff --git a/net/minecraft/world/level/redstone/NeighborUpdater.java b/net/minecraft/world/level/redstone/NeighborUpdater.java
+index 332b33a004ab11150cca0cc2cefc26d0286648f5..3bbdfc1f1df1eaf76c3fdf977845a24c7f26ceb3 100644
+--- a/net/minecraft/world/level/redstone/NeighborUpdater.java
++++ b/net/minecraft/world/level/redstone/NeighborUpdater.java
+@@ -49,6 +49,7 @@ public interface NeighborUpdater {
+     static void executeUpdate(Level level, BlockState state, BlockPos pos, Block neighborBlock, @Nullable Orientation orientation, boolean movedByPiston, BlockPos sourcePos) {
+         // Paper end - Add source block to BlockPhysicsEvent
+         try {
++            if (org.bukkit.event.block.BlockPhysicsEvent.getHandlerList().getRegisteredListeners().length != 0) { // Leaf - Skip BlockPhysicsEvent if no listeners
+             // CraftBukkit start
+             org.bukkit.event.block.BlockPhysicsEvent event = new org.bukkit.event.block.BlockPhysicsEvent(org.bukkit.craftbukkit.block.CraftBlock.at(level, pos), org.bukkit.craftbukkit.block.data.CraftBlockData.fromData(state), org.bukkit.craftbukkit.block.CraftBlock.at(level, sourcePos)); // Paper - Add source block to BlockPhysicsEvent
+             level.getCraftServer().getPluginManager().callEvent(event);
+@@ -57,6 +58,7 @@ public interface NeighborUpdater {
+                 return;
+             }
+             // CraftBukkit end
++            } // Leaf - Skip BlockPhysicsEvent if no listeners
+             state.handleNeighborChanged(level, pos, neighborBlock, orientation, movedByPiston);
+             // Spigot start
+         } catch (StackOverflowError ex) {