PaperMC/Spigot-API-Patches/0030-Reduce-thread-synchronization-in-MetadataStoreBase.patch
Aikar 57dd397155
Updated Upstream (Bukkit/CraftBukkit)
Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing

Bukkit Changes:
b999860d SPIGOT-2304: Add LootGenerateEvent

CraftBukkit Changes:
77fd87e4 SPIGOT-2304: Implement LootGenerateEvent
a1a705ee SPIGOT-5566: Doused campfires & fires should call EntityChangeBlockEvent
41712edd SPIGOT-5707: PersistentDataHolder not Persistent on API dropped Item
2020-05-01 18:03:57 -04:00

93 lines
4.3 KiB
Diff

From da9edaf6bd9b18c3772b3fda4d338ffbc4453cad Mon Sep 17 00:00:00 2001
From: crast <contact@jamescrasta.com>
Date: Sat, 1 Jun 2013 13:52:30 -0600
Subject: [PATCH] Reduce thread synchronization in MetadataStoreBase
Use ConcurrentHashMap to allow thread-safe access methods and very
limited synchronized portions to allow much higher concurrency in
MetadataStore as well as far less locking, especially on reads
diff --git a/src/main/java/org/bukkit/metadata/MetadataStoreBase.java b/src/main/java/org/bukkit/metadata/MetadataStoreBase.java
index baf850226..d363d517c 100644
--- a/src/main/java/org/bukkit/metadata/MetadataStoreBase.java
+++ b/src/main/java/org/bukkit/metadata/MetadataStoreBase.java
@@ -12,7 +12,7 @@ import org.bukkit.plugin.Plugin;
import org.jetbrains.annotations.NotNull;
public abstract class MetadataStoreBase<T> {
- private Map<String, Map<Plugin, MetadataValue>> metadataMap = new HashMap<String, Map<Plugin, MetadataValue>>();
+ private Map<String, Map<Plugin, MetadataValue>> metadataMap = new java.util.concurrent.ConcurrentHashMap<String, Map<Plugin, MetadataValue>>(); // Paper
/**
* Adds a metadata value to an object. Each metadata value is owned by a
@@ -46,7 +46,9 @@ public abstract class MetadataStoreBase<T> {
entry = new WeakHashMap<Plugin, MetadataValue>(1);
metadataMap.put(key, entry);
}
- entry.put(owningPlugin, newMetadataValue);
+ synchronized (entry) {
+ entry.put(owningPlugin, newMetadataValue);
+ }
}
/**
@@ -60,10 +62,11 @@ public abstract class MetadataStoreBase<T> {
* @see MetadataStore#getMetadata(Object, String)
*/
@NotNull
- public synchronized List<MetadataValue> getMetadata(@NotNull T subject, @NotNull String metadataKey) {
+ public List<MetadataValue> getMetadata(@NotNull T subject, @NotNull String metadataKey) { // Paper
String key = disambiguate(subject, metadataKey);
- if (metadataMap.containsKey(key)) {
- Collection<MetadataValue> values = metadataMap.get(key).values();
+ Map<Plugin, MetadataValue> entry = metadataMap.get(key);
+ if (entry != null) {
+ Collection<MetadataValue> values = entry.values();
return Collections.unmodifiableList(new ArrayList<MetadataValue>(values));
} else {
return Collections.emptyList();
@@ -78,7 +81,7 @@ public abstract class MetadataStoreBase<T> {
* @param metadataKey the unique metadata key being queried.
* @return the existence of the metadataKey within subject.
*/
- public synchronized boolean hasMetadata(@NotNull T subject, @NotNull String metadataKey) {
+ public boolean hasMetadata(@NotNull T subject, @NotNull String metadataKey) { // Paper
String key = disambiguate(subject, metadataKey);
return metadataMap.containsKey(key);
}
@@ -94,17 +97,18 @@ public abstract class MetadataStoreBase<T> {
* @see MetadataStore#removeMetadata(Object, String,
* org.bukkit.plugin.Plugin)
*/
- public synchronized void removeMetadata(@NotNull T subject, @NotNull String metadataKey, @NotNull Plugin owningPlugin) {
+ public void removeMetadata(@NotNull T subject, @NotNull String metadataKey, @NotNull Plugin owningPlugin) { // Paper
Validate.notNull(owningPlugin, "Plugin cannot be null");
String key = disambiguate(subject, metadataKey);
Map<Plugin, MetadataValue> entry = metadataMap.get(key);
if (entry == null) {
return;
}
-
- entry.remove(owningPlugin);
- if (entry.isEmpty()) {
- metadataMap.remove(key);
+ synchronized (entry) {
+ entry.remove(owningPlugin);
+ if (entry.isEmpty()) {
+ metadataMap.remove(key);
+ }
}
}
@@ -117,7 +121,7 @@ public abstract class MetadataStoreBase<T> {
* @throws IllegalArgumentException If plugin is null
* @see MetadataStore#invalidateAll(org.bukkit.plugin.Plugin)
*/
- public synchronized void invalidateAll(@NotNull Plugin owningPlugin) {
+ public void invalidateAll(@NotNull Plugin owningPlugin) { // Paper
Validate.notNull(owningPlugin, "Plugin cannot be null");
for (Map<Plugin, MetadataValue> values : metadataMap.values()) {
if (values.containsKey(owningPlugin)) {
--
2.26.2