From 79cf1353b93973a6c53369cb6974cfcf0c7ef30c Mon Sep 17 00:00:00 2001
From: Warrior <50800980+Warriorrrr@users.noreply.github.com>
Date: Sat, 23 Aug 2025 18:25:40 +0200
Subject: [PATCH] Ignore HopperInventorySearchEvent when it has no listeners
 (#13009)

---
 .../patches/features/0028-Optimize-Hoppers.patch     |  8 ++++----
 .../level/block/entity/HopperBlockEntity.java.patch  | 12 +++++++-----
 2 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/paper-server/patches/features/0028-Optimize-Hoppers.patch b/paper-server/patches/features/0028-Optimize-Hoppers.patch
index dd1f53d34..721c156fe 100644
--- a/paper-server/patches/features/0028-Optimize-Hoppers.patch
+++ b/paper-server/patches/features/0028-Optimize-Hoppers.patch
@@ -48,7 +48,7 @@ index 0000000000000000000000000000000000000000..24a2090e068ad3c0d08705050944abdf
 +    }
 +}
 diff --git a/net/minecraft/server/MinecraftServer.java b/net/minecraft/server/MinecraftServer.java
-index 34b10db71d22cb7211dcfc5565e6833c8d4d2413..382d2b6b53bd144f4d56dccdc603ed0da8fe07a7 100644
+index 6c8f06bc55cc6bffe6879433c5eda74eb5a13cb0..914ab3ad3e9b5735fcc179e17aaad82ab1b63b18 100644
 --- a/net/minecraft/server/MinecraftServer.java
 +++ b/net/minecraft/server/MinecraftServer.java
 @@ -1719,6 +1719,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
@@ -103,7 +103,7 @@ index 275646a9f99f3c46bc81a23143c1960f2a6300b1..5986825d6a381eeb445dd424dd127864
          }
      }
 diff --git a/net/minecraft/world/level/block/entity/HopperBlockEntity.java b/net/minecraft/world/level/block/entity/HopperBlockEntity.java
-index 94d68fbb3d152b2fd43f989b728c5efabbf3c22c..800b7e78ae989868ed0b9e060c80dcd002759412 100644
+index 0af3eef04782b7d54c5bb0b0cfe2c2b5e052661e..01ed25d1f895d94485b5fecd98476534cbb26930 100644
 --- a/net/minecraft/world/level/block/entity/HopperBlockEntity.java
 +++ b/net/minecraft/world/level/block/entity/HopperBlockEntity.java
 @@ -143,18 +143,56 @@ public class HopperBlockEntity extends RandomizableContainerBlockEntity implemen
@@ -628,7 +628,7 @@ index 94d68fbb3d152b2fd43f989b728c5efabbf3c22c..800b7e78ae989868ed0b9e060c80dcd0
                  stack = leftover; // Paper - Make hoppers respect inventory max stack size
                  flag = true;
              } else if (canMergeItems(item, stack)) {
-@@ -523,13 +772,19 @@ public class HopperBlockEntity extends RandomizableContainerBlockEntity implemen
+@@ -525,13 +774,19 @@ public class HopperBlockEntity extends RandomizableContainerBlockEntity implemen
  
      @Nullable
      public static Container getContainerAt(Level level, BlockPos pos) {
@@ -650,7 +650,7 @@ index 94d68fbb3d152b2fd43f989b728c5efabbf3c22c..800b7e78ae989868ed0b9e060c80dcd0
              blockContainer = getEntityContainer(level, x, y, z);
          }
  
-@@ -555,14 +810,14 @@ public class HopperBlockEntity extends RandomizableContainerBlockEntity implemen
+@@ -557,14 +812,14 @@ public class HopperBlockEntity extends RandomizableContainerBlockEntity implemen
  
      @Nullable
      private static Container getEntityContainer(Level level, double x, double y, double z) {
diff --git a/paper-server/patches/sources/net/minecraft/world/level/block/entity/HopperBlockEntity.java.patch b/paper-server/patches/sources/net/minecraft/world/level/block/entity/HopperBlockEntity.java.patch
index 4bac34fb3..7b9f65138 100644
--- a/paper-server/patches/sources/net/minecraft/world/level/block/entity/HopperBlockEntity.java.patch
+++ b/paper-server/patches/sources/net/minecraft/world/level/block/entity/HopperBlockEntity.java.patch
@@ -237,7 +237,7 @@
                  }
  
                  destination.setChanged();
-@@ -336,14 +_,57 @@
+@@ -336,14 +_,59 @@
          return stack;
      }
  
@@ -263,9 +263,10 @@
      @Nullable
      private static Container getAttachedContainer(Level level, BlockPos pos, HopperBlockEntity blockEntity) {
 -        return getContainerAt(level, pos.relative(blockEntity.facing));
-+        // CraftBukkit start
++        // Paper start
 +        BlockPos searchPosition = pos.relative(blockEntity.facing);
 +        Container inventory = getContainerAt(level, searchPosition);
++        if (org.bukkit.event.inventory.HopperInventorySearchEvent.getHandlerList().getRegisteredListeners().length == 0) return inventory;
 +
 +        org.bukkit.craftbukkit.block.CraftBlock hopper = org.bukkit.craftbukkit.block.CraftBlock.at(level, pos);
 +        org.bukkit.craftbukkit.block.CraftBlock searchBlock = org.bukkit.craftbukkit.block.CraftBlock.at(level, searchPosition);
@@ -275,14 +276,15 @@
 +            searchBlock,
 +            org.bukkit.event.inventory.HopperInventorySearchEvent.ContainerType.DESTINATION
 +        );
-+        // CraftBukkit end
++        // Paper end
      }
  
      @Nullable
      private static Container getSourceContainer(Level level, Hopper hopper, BlockPos pos, BlockState state) {
 -        return getContainerAt(level, pos, state, hopper.getLevelX(), hopper.getLevelY() + 1.0, hopper.getLevelZ());
-+        // CraftBukkit start
++        // Paper start
 +        final Container inventory = HopperBlockEntity.getContainerAt(level, pos, state, hopper.getLevelX(), hopper.getLevelY() + 1.0D, hopper.getLevelZ());
++        if (org.bukkit.event.inventory.HopperInventorySearchEvent.getHandlerList().getRegisteredListeners().length == 0) return inventory;
 +
 +        final BlockPos hopperPos = BlockPos.containing(hopper.getLevelX(), hopper.getLevelY(), hopper.getLevelZ());
 +        org.bukkit.craftbukkit.block.CraftBlock hopperBlock = org.bukkit.craftbukkit.block.CraftBlock.at(level, hopperPos);
@@ -293,7 +295,7 @@
 +            containerBlock,
 +            org.bukkit.event.inventory.HopperInventorySearchEvent.ContainerType.SOURCE
 +        );
-+        // CraftBukkit end
++        // Paper end
      }
  
      public static List<ItemEntity> getItemsAtAndAbove(Level level, Hopper hopper) {