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Fix race condition reintroduced in Prioritize class loader patch

This commit is contained in:
Aikar 2020-05-18 01:18:44 -04:00
parent 6f196fe701
commit 9254a80a1b
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GPG Key ID: 401ADFC9891FAAFE
1 changed files with 47 additions and 28 deletions
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75
Spigot-API-Patches/0207-Prioritise-own-classes-where-possible.patch
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@ -24,38 +24,57 @@ than the one they were registered in.
The patch in general terms just loads the class in the plugin's jar
before it starts looking elsewhere for it.
diff --git a/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java b/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java
index ba2c5c6eee6fc9f7c96c3ab304d8a1fc759ccd77..528ceeb22c55f23259340c29e3c4ed5ece89a118 100644
--- a/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java
+++ b/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java
@@ -50,6 +50,7 @@ import org.yaml.snakeyaml.error.YAMLException;
*/
public final class JavaPluginLoader implements PluginLoader {
final Server server;
+ private static final boolean DISABLE_CLASS_PRIORITIZATION = Boolean.getBoolean("Paper.DisableClassPrioritization"); // Paper
private final Pattern[] fileFilters = new Pattern[]{Pattern.compile("\\.jar$")};
private final Map<String, Class<?>> classes = new ConcurrentHashMap<String, Class<?>>();
private final Map<String, java.util.concurrent.locks.ReentrantReadWriteLock> classLoadLock = new java.util.HashMap<String, java.util.concurrent.locks.ReentrantReadWriteLock>(); // Paper
@@ -193,6 +194,11 @@ public final class JavaPluginLoader implements PluginLoader {
@Nullable
Class<?> getClassByName(final String name) {
+ // Paper start - prioritize self
+ return getClassByName(name, null);
+ }
+ Class<?> getClassByName(final String name, PluginClassLoader requester) {
+ // Paper end
// Paper start - make MT safe
Class<?> cachedClass = classes.get(name);
if (cachedClass != null) {
@@ -204,6 +210,16 @@ public final class JavaPluginLoader implements PluginLoader {
classLoadLockCount.compute(name, (x, prev) -> prev != null ? prev + 1 : 1);
}
lock.writeLock().lock();try {
+ // Paper start - prioritize self
+ if (!DISABLE_CLASS_PRIORITIZATION && requester != null) {
+ try {
+ cachedClass = requester.findClass(name, false);
+ } catch (ClassNotFoundException cnfe) {}
+ if (cachedClass != null) {
+ return cachedClass;
+ }
+ }
+ // Paper end-
cachedClass = classes.get(name);
// Paper end
diff --git a/src/main/java/org/bukkit/plugin/java/PluginClassLoader.java b/src/main/java/org/bukkit/plugin/java/PluginClassLoader.java
index 3a02dbe9d183bc907dcce081d8338d5716ed5242..2abd140ce238c511c513179e360782ab7ecb53c8 100644
index 3a02dbe9d183bc907dcce081d8338d5716ed5242..28e5c6591fb594ca79ee92480cedc8f549e3fe01 100644
--- a/src/main/java/org/bukkit/plugin/java/PluginClassLoader.java
+++ b/src/main/java/org/bukkit/plugin/java/PluginClassLoader.java
@@ -29,6 +29,7 @@ import org.jetbrains.annotations.Nullable;
* A ClassLoader for plugins, to allow shared classes across multiple plugins
*/
public final class PluginClassLoader extends URLClassLoader { // Spigot
+ private static final boolean DISABLE_CLASS_PRIORITIZATION = Boolean.getBoolean("Paper.DisableClassPrioritization"); // Paper
public JavaPlugin getPlugin() { return plugin; } // Spigot
private final JavaPluginLoader loader;
private final Map<String, Class<?>> classes = new ConcurrentHashMap<String, Class<?>>();
@@ -107,7 +108,10 @@ public final class PluginClassLoader extends URLClassLoader { // Spigot
Class<?> result = classes.get(name);
@@ -108,7 +108,7 @@ public final class PluginClassLoader extends URLClassLoader { // Spigot
if (result == null) {
- if (checkGlobal) {
+ String path = name.replace('.', '/').concat(".class"); // Paper - moved up
+ JarEntry entry = jar.getJarEntry(path); // Paper - moved up
+
+ if (checkGlobal && (entry == null || DISABLE_CLASS_PRIORITIZATION)) { // Paper - prioritise own classes if they exist
result = loader.getClassByName(name);
if (checkGlobal) {
- result = loader.getClassByName(name);
+ result = loader.getClassByName(name, this); // Paper - prioritize self
if (result != null) {
@@ -129,9 +133,7 @@ public final class PluginClassLoader extends URLClassLoader { // Spigot
}
if (result == null) {
- String path = name.replace('.', '/').concat(".class");
- JarEntry entry = jar.getJarEntry(path);
-
+ // Paper - move code here up
if (entry != null) {
byte[] classBytes;
PluginDescriptionFile provider = ((PluginClassLoader) result.getClassLoader()).description;