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Fix Optional null issue - Fixes #3155

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Also check class loader cache before locking to speed up cached hits to avoid the lock

wasn't gonna make a unique build just for that but can lump it in here.
This commit is contained in:
Aikar
2020-04-16 03:57:02 -04:00
parent e7f799903e
commit 902942d9e4
2 changed files with 10 additions and 5 deletions
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9
Spigot-API-Patches/Make-JavaPluginLoader-thread-safe.patch
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@@ -5,7 +5,7 @@ Subject: [PATCH] Make JavaPluginLoader thread-safe
diff --git a/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java b/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java
index 8ff228ce..c0884f27 100644
index 8ff228ce..ba2c5c6e 100644
--- a/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java
+++ b/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java
@@ -0,0 +0,0 @@ public final class JavaPluginLoader implements PluginLoader {
@@ -22,16 +22,21 @@ index 8ff228ce..c0884f27 100644
@Nullable
Class<?> getClassByName(final String name) {
+ // Paper start - make MT safe
Class<?> cachedClass = classes.get(name);
+ if (cachedClass != null) {
+ return cachedClass;
+ }
+ java.util.concurrent.locks.ReentrantReadWriteLock lock;
+ synchronized (classLoadLock) {
+ lock = classLoadLock.computeIfAbsent(name, (x) -> new java.util.concurrent.locks.ReentrantReadWriteLock());
+ classLoadLockCount.compute(name, (x, prev) -> prev != null ? prev + 1 : 1);
+ }
+ lock.writeLock().lock();try {
+ cachedClass = classes.get(name);
+ // Paper end
Class<?> cachedClass = classes.get(name);
if (cachedClass != null) {
return cachedClass;
@@ -0,0 +0,0 @@ public final class JavaPluginLoader implements PluginLoader {
}
}