59 lines
2.4 KiB
Diff
59 lines
2.4 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Aikar <aikar@aikar.co>
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Date: Tue, 21 Apr 2020 03:51:53 -0400
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Subject: [PATCH] Allow multiple callbacks to schedule for Callback Executor
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ChunkMapDistance polls multiple entries for pendingChunkUpdates
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Each of these have the potential to move a chunk in and out of
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"Loaded" state, which will result in multiple callbacks being
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needed within a single tick of ChunkMapDistance
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Use an ArrayDeque to store this Queue
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We make sure to also implement a pattern that is recursion safe too.
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diff --git a/src/main/java/net/minecraft/server/PlayerChunkMap.java b/src/main/java/net/minecraft/server/PlayerChunkMap.java
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index 030c980b522c4cada800e5d8ca47f0b8733bf5b6..4d591d620262e8c4ed0508b01e26ef7355e75e88 100644
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--- a/src/main/java/net/minecraft/server/PlayerChunkMap.java
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+++ b/src/main/java/net/minecraft/server/PlayerChunkMap.java
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@@ -110,24 +110,32 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
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public final CallbackExecutor callbackExecutor = new CallbackExecutor();
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public static final class CallbackExecutor implements java.util.concurrent.Executor, Runnable {
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- private Runnable queued;
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+ // Paper start - replace impl with recursive safe multi entry queue
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+ // it's possible to schedule multiple tasks currently, so it's vital we change this impl
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+ // If we recurse into the executor again, we will append to another queue, ensuring task order consistency
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+ private java.util.ArrayDeque<Runnable> queued = new java.util.ArrayDeque<>();
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@Override
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public void execute(Runnable runnable) {
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- if (queued != null) {
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- throw new IllegalStateException("Already queued");
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+ if (queued == null) {
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+ queued = new java.util.ArrayDeque<>();
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}
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- queued = runnable;
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+ queued.add(runnable);
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}
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@Override
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public void run() {
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- Runnable task = queued;
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+ if (queued == null) {
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+ return;
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+ }
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+ java.util.ArrayDeque<Runnable> queue = queued;
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queued = null;
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- if (task != null) {
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+ Runnable task;
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+ while ((task = queue.pollFirst()) != null) {
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task.run();
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}
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}
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+ // Paper end
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};
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// CraftBukkit end
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