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994679a0c9
Tux pointed out the patch still has O(n^2) time complexity since the sublist class in arraylist does not override clear() from AbstractList, which uses a forward moving iterator to clear the list. Resolved by using a peek and poll from ArrayDeque. This patch also removes the useless WeakHashMap which holds the list (it mapped world->list) and replaces it with a field on World.
93 lines
4.5 KiB
Diff
93 lines
4.5 KiB
Diff
From d52d8059d6a382725261365b534a91ff351b17c2 Mon Sep 17 00:00:00 2001
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From: Martin Panzer <postremus1996@googlemail.com>
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Date: Mon, 23 May 2016 12:12:37 +0200
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Subject: [PATCH] Faster redstone torch rapid clock removal
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Only resize the the redstone torch list once, since resizing arrays / lists is costly
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diff --git a/src/main/java/net/minecraft/server/BlockRedstoneTorch.java b/src/main/java/net/minecraft/server/BlockRedstoneTorch.java
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index a99f979ef..919ba8a14 100644
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--- a/src/main/java/net/minecraft/server/BlockRedstoneTorch.java
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+++ b/src/main/java/net/minecraft/server/BlockRedstoneTorch.java
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@@ -11,7 +11,7 @@ import org.bukkit.event.block.BlockRedstoneEvent; // CraftBukkit
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public class BlockRedstoneTorch extends BlockTorch {
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public static final BlockStateBoolean LIT = BlockProperties.r;
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- private static final Map<IBlockAccess, List<BlockRedstoneTorch.RedstoneUpdateInfo>> b = new WeakHashMap();
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+ // Paper - Move the mapped list to World
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protected BlockRedstoneTorch(Block.Info block_info) {
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super(block_info);
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@@ -66,11 +66,16 @@ public class BlockRedstoneTorch extends BlockTorch {
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}
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public static void a(IBlockData iblockdata, World world, BlockPosition blockposition, Random random, boolean flag) {
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- List list = (List) BlockRedstoneTorch.b.get(world);
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+ // Paper start
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+ java.util.ArrayDeque<BlockRedstoneTorch.RedstoneUpdateInfo> redstoneUpdateInfos = world.redstoneUpdateInfos;
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- while (list != null && !list.isEmpty() && world.getTime() - ((BlockRedstoneTorch.RedstoneUpdateInfo) list.get(0)).b > 60L) {
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- list.remove(0);
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+ if (redstoneUpdateInfos != null) {
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+ BlockRedstoneTorch.RedstoneUpdateInfo curr;
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+ while ((curr = redstoneUpdateInfos.peek()) != null && world.getTime() - curr.getTime() > 60L) {
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+ redstoneUpdateInfos.poll();
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+ }
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}
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+ // Paper end
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// CraftBukkit start
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org.bukkit.plugin.PluginManager manager = world.getServer().getPluginManager();
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@@ -140,9 +145,12 @@ public class BlockRedstoneTorch extends BlockTorch {
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}
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private static boolean a(World world, BlockPosition blockposition, boolean flag) {
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- List<BlockRedstoneTorch.RedstoneUpdateInfo> list = (List) BlockRedstoneTorch.b.computeIfAbsent(world, (iblockaccess) -> {
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- return Lists.newArrayList();
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- });
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+ // Paper start
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+ java.util.ArrayDeque<BlockRedstoneTorch.RedstoneUpdateInfo> list = world.redstoneUpdateInfos;
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+ if (list == null) {
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+ list = world.redstoneUpdateInfos = new java.util.ArrayDeque<>();
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+ }
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+
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if (flag) {
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list.add(new BlockRedstoneTorch.RedstoneUpdateInfo(blockposition.immutableCopy(), world.getTime()));
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@@ -150,9 +158,9 @@ public class BlockRedstoneTorch extends BlockTorch {
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int i = 0;
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- for (int j = 0; j < list.size(); ++j) {
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- BlockRedstoneTorch.RedstoneUpdateInfo blockredstonetorch_redstoneupdateinfo = (BlockRedstoneTorch.RedstoneUpdateInfo) list.get(j);
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-
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+ for (java.util.Iterator<BlockRedstoneTorch.RedstoneUpdateInfo> iterator = list.iterator(); iterator.hasNext();) {
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+ BlockRedstoneTorch.RedstoneUpdateInfo blockredstonetorch_redstoneupdateinfo = iterator.next();
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+ // Paper end
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if (blockredstonetorch_redstoneupdateinfo.a.equals(blockposition)) {
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++i;
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if (i >= 8) {
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@@ -167,7 +175,7 @@ public class BlockRedstoneTorch extends BlockTorch {
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public static class RedstoneUpdateInfo {
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private final BlockPosition a;
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- private final long b;
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+ private final long b; final long getTime() { return this.b; } // Paper - OBFHELPER
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public RedstoneUpdateInfo(BlockPosition blockposition, long i) {
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this.a = blockposition;
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diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
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index de09ed97e..3305e110c 100644
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--- a/src/main/java/net/minecraft/server/World.java
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+++ b/src/main/java/net/minecraft/server/World.java
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@@ -99,6 +99,7 @@ public abstract class World implements IIBlockAccess, GeneratorAccess, AutoClose
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private org.spigotmc.TickLimiter tileLimiter;
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private int tileTickPosition;
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public final Map<Explosion.CacheKey, Float> explosionDensityCache = new HashMap<>(); // Paper - Optimize explosions
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+ public java.util.ArrayDeque<BlockRedstoneTorch.RedstoneUpdateInfo> redstoneUpdateInfos; // Paper - Move from Map in BlockRedstoneTorch to here
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public CraftWorld getWorld() {
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return this.world;
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--
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2.21.0
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