From 3d14572f7a9ba30b0eae0daf0a239b60e3ebc457 Mon Sep 17 00:00:00 2001
From: Martin Panzer <postremus1996@googlemail.com>
Date: Mon, 23 May 2016 12:12:37 +0200
Subject: [PATCH] Faster redstone torch rapid clock removal

Only resize the the redstone torch list once, since resizing arrays / lists is costly

diff --git a/src/main/java/net/minecraft/server/BlockRedstoneTorch.java b/src/main/java/net/minecraft/server/BlockRedstoneTorch.java
index a99f979ef..919ba8a14 100644
--- a/src/main/java/net/minecraft/server/BlockRedstoneTorch.java
+++ b/src/main/java/net/minecraft/server/BlockRedstoneTorch.java
@@ -11,7 +11,7 @@ import org.bukkit.event.block.BlockRedstoneEvent; // CraftBukkit
 public class BlockRedstoneTorch extends BlockTorch {
 
     public static final BlockStateBoolean LIT = BlockProperties.r;
-    private static final Map<IBlockAccess, List<BlockRedstoneTorch.RedstoneUpdateInfo>> b = new WeakHashMap();
+    // Paper - Move the mapped list to World
 
     protected BlockRedstoneTorch(Block.Info block_info) {
         super(block_info);
@@ -66,11 +66,16 @@ public class BlockRedstoneTorch extends BlockTorch {
     }
 
     public static void a(IBlockData iblockdata, World world, BlockPosition blockposition, Random random, boolean flag) {
-        List list = (List) BlockRedstoneTorch.b.get(world);
+        // Paper start
+        java.util.ArrayDeque<BlockRedstoneTorch.RedstoneUpdateInfo> redstoneUpdateInfos = world.redstoneUpdateInfos;
 
-        while (list != null && !list.isEmpty() && world.getTime() - ((BlockRedstoneTorch.RedstoneUpdateInfo) list.get(0)).b > 60L) {
-            list.remove(0);
+        if (redstoneUpdateInfos != null) {
+            BlockRedstoneTorch.RedstoneUpdateInfo curr;
+            while ((curr = redstoneUpdateInfos.peek()) != null && world.getTime() - curr.getTime() > 60L) {
+                redstoneUpdateInfos.poll();
+            }
         }
+        // Paper end
 
         // CraftBukkit start
         org.bukkit.plugin.PluginManager manager = world.getServer().getPluginManager();
@@ -140,9 +145,12 @@ public class BlockRedstoneTorch extends BlockTorch {
     }
 
     private static boolean a(World world, BlockPosition blockposition, boolean flag) {
-        List<BlockRedstoneTorch.RedstoneUpdateInfo> list = (List) BlockRedstoneTorch.b.computeIfAbsent(world, (iblockaccess) -> {
-            return Lists.newArrayList();
-        });
+        // Paper start
+        java.util.ArrayDeque<BlockRedstoneTorch.RedstoneUpdateInfo> list = world.redstoneUpdateInfos;
+        if (list == null) {
+            list = world.redstoneUpdateInfos = new java.util.ArrayDeque<>();
+        }
+
 
         if (flag) {
             list.add(new BlockRedstoneTorch.RedstoneUpdateInfo(blockposition.immutableCopy(), world.getTime()));
@@ -150,9 +158,9 @@ public class BlockRedstoneTorch extends BlockTorch {
 
         int i = 0;
 
-        for (int j = 0; j < list.size(); ++j) {
-            BlockRedstoneTorch.RedstoneUpdateInfo blockredstonetorch_redstoneupdateinfo = (BlockRedstoneTorch.RedstoneUpdateInfo) list.get(j);
-
+        for (java.util.Iterator<BlockRedstoneTorch.RedstoneUpdateInfo> iterator = list.iterator(); iterator.hasNext();) {
+            BlockRedstoneTorch.RedstoneUpdateInfo blockredstonetorch_redstoneupdateinfo = iterator.next();
+            // Paper end
             if (blockredstonetorch_redstoneupdateinfo.a.equals(blockposition)) {
                 ++i;
                 if (i >= 8) {
@@ -167,7 +175,7 @@ public class BlockRedstoneTorch extends BlockTorch {
     public static class RedstoneUpdateInfo {
 
         private final BlockPosition a;
-        private final long b;
+        private final long b; final long getTime() { return this.b; } // Paper - OBFHELPER
 
         public RedstoneUpdateInfo(BlockPosition blockposition, long i) {
             this.a = blockposition;
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index f396ca691..4ce18f85b 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -99,6 +99,7 @@ public abstract class World implements IIBlockAccess, GeneratorAccess, AutoClose
     private org.spigotmc.TickLimiter tileLimiter;
     private int tileTickPosition;
     public final Map<Explosion.CacheKey, Float> explosionDensityCache = new HashMap<>(); // Paper - Optimize explosions
+    public java.util.ArrayDeque<BlockRedstoneTorch.RedstoneUpdateInfo> redstoneUpdateInfos; // Paper - Move from Map in BlockRedstoneTorch to here
 
     public CraftWorld getWorld() {
         return this.world;
-- 
2.22.0