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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 The patch in general terms just loads the class in the plugin's jar
before it starts looking elsewhere for it. 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 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 --- a/src/main/java/org/bukkit/plugin/java/PluginClassLoader.java
+++ b/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; @@ -108,7 +108,7 @@ public final class PluginClassLoader extends URLClassLoader { // Spigot
* 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);
if (result == null) { if (result == null) {
- if (checkGlobal) { if (checkGlobal) {
+ String path = name.replace('.', '/').concat(".class"); // Paper - moved up - result = loader.getClassByName(name);
+ JarEntry entry = jar.getJarEntry(path); // Paper - moved up + result = loader.getClassByName(name, this); // Paper - prioritize self
+
+ if (checkGlobal && (entry == null || DISABLE_CLASS_PRIORITIZATION)) { // Paper - prioritise own classes if they exist
result = loader.getClassByName(name);
if (result != null) { if (result != null) {
@@ -129,9 +133,7 @@ public final class PluginClassLoader extends URLClassLoader { // Spigot PluginDescriptionFile provider = ((PluginClassLoader) result.getClassLoader()).description;
}
if (result == null) {
- String path = name.replace('.', '/').concat(".class");
- JarEntry entry = jar.getJarEntry(path);
-
+ // Paper - move code here up
if (entry != null) {
byte[] classBytes;