PaperMC/Bukkit-Patches/0027-Ease-ClassLoader-Deadlocks-Where-Possible.patch
Zach Brown 19972e09b8 Update SpigotMC's patches
5a0150f586ed3eb15fe6f1f596d1a5a7d806f0f9 Fix ITEM_BREAK
e6a3911057bd94d8bd7021cbb4923fb84fb106d1 Upstream merge
d1cdcf8d4c3639f956474f02ed662517cffbe23e Remove old patch
068df64aeee368377e1673667bffc7a6dcf90554 Rebuild all patches
2014-11-30 16:16:48 -06:00

67 lines
3.6 KiB
Diff

From 7b22f91f252d08fdad9c53a669f51356fb34db71 Mon Sep 17 00:00:00 2001
From: md_5 <git@md-5.net>
Date: Wed, 16 Jul 2014 17:24:21 +1000
Subject: [PATCH] Ease ClassLoader Deadlocks Where Possible
When on Java 7 we can register the classloader as parallel capable to prevent deadlocks caused by certain scenarios. Due to the nature of PluginClassLoader this isn't completely safe, but we can make it safer by switching to concurrency focused collections. Either way this is far better than crashing the server.
diff --git a/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java b/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java
index b081ecb..0ac8325 100644
--- a/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java
+++ b/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java
@@ -48,7 +48,7 @@ import org.yaml.snakeyaml.error.YAMLException;
public final class JavaPluginLoader implements PluginLoader {
final Server server;
private final Pattern[] fileFilters = new Pattern[] { Pattern.compile("\\.jar$"), };
- private final Map<String, Class<?>> classes = new HashMap<String, Class<?>>();
+ private final Map<String, Class<?>> classes = new java.util.concurrent.ConcurrentHashMap<String, Class<?>>(); // Spigot
private final Map<String, PluginClassLoader> loaders = new LinkedHashMap<String, PluginClassLoader>();
public static final CustomTimingsHandler pluginParentTimer = new CustomTimingsHandler("** Plugins"); // Spigot
diff --git a/src/main/java/org/bukkit/plugin/java/PluginClassLoader.java b/src/main/java/org/bukkit/plugin/java/PluginClassLoader.java
index 13f8633..4cffa13 100644
--- a/src/main/java/org/bukkit/plugin/java/PluginClassLoader.java
+++ b/src/main/java/org/bukkit/plugin/java/PluginClassLoader.java
@@ -17,7 +17,7 @@ import org.bukkit.plugin.PluginDescriptionFile;
*/
final class PluginClassLoader extends URLClassLoader {
private final JavaPluginLoader loader;
- private final Map<String, Class<?>> classes = new HashMap<String, Class<?>>();
+ private final Map<String, Class<?>> classes = new java.util.concurrent.ConcurrentHashMap<String, Class<?>>(); // Spigot
private final PluginDescriptionFile description;
private final File dataFolder;
private final File file;
@@ -25,6 +25,30 @@ final class PluginClassLoader extends URLClassLoader {
private JavaPlugin pluginInit;
private IllegalStateException pluginState;
+ // Spigot Start
+ static
+ {
+ try
+ {
+ java.lang.reflect.Method method = ClassLoader.class.getDeclaredMethod( "registerAsParallelCapable" );
+ if ( method != null )
+ {
+ boolean oldAccessible = method.isAccessible();
+ method.setAccessible( true );
+ method.invoke( null );
+ method.setAccessible( oldAccessible );
+ org.bukkit.Bukkit.getLogger().log( java.util.logging.Level.INFO, "Set PluginClassLoader as parallel capable" );
+ }
+ } catch ( NoSuchMethodException ex )
+ {
+ // Ignore
+ } catch ( Exception ex )
+ {
+ org.bukkit.Bukkit.getLogger().log( java.util.logging.Level.WARNING, "Error setting PluginClassLoader as parallel capable", ex );
+ }
+ }
+ // Spigot End
+
PluginClassLoader(final JavaPluginLoader loader, final ClassLoader parent, final PluginDescriptionFile description, final File dataFolder, final File file) throws InvalidPluginException, MalformedURLException {
super(new URL[] {file.toURI().toURL()}, parent);
Validate.notNull(loader, "Loader cannot be null");
--
2.1.0