59 lines
2.7 KiB
Diff
59 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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