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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.
35 lines
1.5 KiB
Diff
35 lines
1.5 KiB
Diff
From d2b2e3091b3cf797a06a1fc5c86388e90d87f384 Mon Sep 17 00:00:00 2001
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From: Aikar <aikar@aikar.co>
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Date: Sat, 6 Apr 2019 10:16:48 -0400
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Subject: [PATCH] Optimize Captured TileEntity Lookup
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upstream was doing a containsKey/get pattern, and always doing it at that.
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that scenario is only even valid if were in the middle of a block place.
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Optimize to check if the captured list even has values in it, and also to
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just do a get call since the value can never be null.
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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 ab56086e1..a1e660767 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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@@ -1051,12 +1051,13 @@ public abstract class World implements IIBlockAccess, GeneratorAccess, AutoClose
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return null;
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} else {
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// CraftBukkit start
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- if (capturedTileEntities.containsKey(blockposition)) {
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- return capturedTileEntities.get(blockposition);
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+ TileEntity tileentity = null; // Paper
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+ if (!capturedTileEntities.isEmpty() && (tileentity = capturedTileEntities.get(blockposition)) != null) { // Paper
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+ return tileentity; // Paper
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}
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// CraftBukkit end
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- TileEntity tileentity = null;
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+ //TileEntity tileentity = null; // Paper - move up
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if (this.tickingTileEntities) {
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tileentity = this.B(blockposition);
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--
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2.21.0
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