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74f507f4e3
Upstream has released updates that appears to apply and compile correctly. This update has not been tested by PaperMC and as with ANY update, please do your own testing Bukkit Changes: e461dcfe #555: Item - add getters/setters for owner/thrower CraftBukkit Changes: 055870c4 #758: Item - add getters/setters for owner/thrower
60 lines
2.7 KiB
Diff
60 lines
2.7 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Trigary <trigary0@gmail.com>
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Date: Wed, 15 Apr 2020 01:24:55 -0400
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Subject: [PATCH] Make JavaPluginLoader thread-safe
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diff --git a/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java b/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java
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index de44d850d7b3ab3e528eb6f2de375a6c3e0e5cf9..9d1f7cdf12029c8198792fd299f92be476040222 100644
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--- a/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java
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+++ b/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java
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@@ -52,6 +52,8 @@ public final class JavaPluginLoader implements PluginLoader {
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final Server server;
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private final Pattern[] fileFilters = new Pattern[]{Pattern.compile("\\.jar$")};
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private final Map<String, Class<?>> classes = new ConcurrentHashMap<String, Class<?>>();
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+ private final Map<String, java.util.concurrent.locks.ReentrantReadWriteLock> classLoadLock = new java.util.HashMap<String, java.util.concurrent.locks.ReentrantReadWriteLock>(); // Paper
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+ private final Map<String, Integer> classLoadLockCount = new java.util.HashMap<String, Integer>(); // Paper
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private final List<PluginClassLoader> loaders = new CopyOnWriteArrayList<PluginClassLoader>();
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/**
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@@ -191,7 +193,19 @@ public final class JavaPluginLoader implements PluginLoader {
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@Nullable
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Class<?> getClassByName(final String name) {
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+ // Paper start - make MT safe
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Class<?> cachedClass = classes.get(name);
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+ if (cachedClass != null) {
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+ return cachedClass;
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+ }
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+ java.util.concurrent.locks.ReentrantReadWriteLock lock;
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+ synchronized (classLoadLock) {
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+ lock = classLoadLock.computeIfAbsent(name, (x) -> new java.util.concurrent.locks.ReentrantReadWriteLock());
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+ classLoadLockCount.compute(name, (x, prev) -> prev != null ? prev + 1 : 1);
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+ }
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+ lock.writeLock().lock();try {
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+ cachedClass = classes.get(name);
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+ // Paper end
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if (cachedClass != null) {
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return cachedClass;
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@@ -205,6 +219,19 @@ public final class JavaPluginLoader implements PluginLoader {
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}
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}
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}
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+ // Paper start - make MT safe
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+ } finally {
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+ synchronized (classLoadLock) {
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+ lock.writeLock().unlock();
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+ if (classLoadLockCount.get(name) == 1) {
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+ classLoadLock.remove(name);
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+ classLoadLockCount.remove(name);
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+ } else {
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+ classLoadLockCount.compute(name, (x, prev) -> prev - 1);
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+ }
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+ }
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+ }
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+ // Paper end
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return null;
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}
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