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Ease ClassLoader Deadlocks Where Possible

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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.
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md_5 2014-07-16 17:24:29 +10:00
parent f3e4b53e57
commit 54909dd874
1 changed files with 64 additions and 0 deletions
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Bukkit-Patches/0027-Ease-ClassLoader-Deadlocks-Where-Possible.patch Normal file
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@ -0,0 +1,64 @@
From 12ff30ada518914f61e35fca0d19b2eeda61a674 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 6611342..a845e81 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..6890106 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 +25,27 @@ 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 ( 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");
--
1.9.1