105 lines
4.8 KiB
Diff
105 lines
4.8 KiB
Diff
From 270a57e64ae5f5a383b35a424dab9a45aa781eaf Mon Sep 17 00:00:00 2001
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From: crast <contact@jamescrasta.com>
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Date: Sat, 1 Jun 2013 13:52:30 -0600
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Subject: [PATCH] Reduce thread synchronization in MetadataStoreBase
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Use ConcurrentHashMap to allow thread-safe access methods and very
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limited synchronized portions to allow much higher concurrency in
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MetadataStore as well as far less locking, especially on reads
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diff --git a/src/main/java/org/bukkit/metadata/MetadataStoreBase.java b/src/main/java/org/bukkit/metadata/MetadataStoreBase.java
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index 093c144..64c0f0a 100644
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--- a/src/main/java/org/bukkit/metadata/MetadataStoreBase.java
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+++ b/src/main/java/org/bukkit/metadata/MetadataStoreBase.java
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@@ -4,9 +4,10 @@ import org.apache.commons.lang.Validate;
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import org.bukkit.plugin.Plugin;
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import java.util.*;
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+import java.util.concurrent.ConcurrentHashMap;
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public abstract class MetadataStoreBase<T> {
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- private Map<String, Map<Plugin, MetadataValue>> metadataMap = new HashMap<String, Map<Plugin, MetadataValue>>();
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+ private Map<String, Map<Plugin, MetadataValue>> metadataMap = new ConcurrentHashMap<String, Map<Plugin, MetadataValue>>();
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/**
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* Adds a metadata value to an object. Each metadata value is owned by a
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@@ -30,7 +31,7 @@ public abstract class MetadataStoreBase<T> {
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* @throws IllegalArgumentException If value is null, or the owning plugin
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* is null
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*/
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- public synchronized void setMetadata(T subject, String metadataKey, MetadataValue newMetadataValue) {
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+ public void setMetadata(T subject, String metadataKey, MetadataValue newMetadataValue) {
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Validate.notNull(newMetadataValue, "Value cannot be null");
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Plugin owningPlugin = newMetadataValue.getOwningPlugin();
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Validate.notNull(owningPlugin, "Plugin cannot be null");
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@@ -40,7 +41,9 @@ public abstract class MetadataStoreBase<T> {
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entry = new WeakHashMap<Plugin, MetadataValue>(1);
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metadataMap.put(key, entry);
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}
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- entry.put(owningPlugin, newMetadataValue);
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+ synchronized (entry) {
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+ entry.put(owningPlugin, newMetadataValue);
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+ }
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}
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/**
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@@ -53,10 +56,11 @@ public abstract class MetadataStoreBase<T> {
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* requested value.
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* @see MetadataStore#getMetadata(Object, String)
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*/
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- public synchronized List<MetadataValue> getMetadata(T subject, String metadataKey) {
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+ public List<MetadataValue> getMetadata(T subject, String metadataKey) {
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String key = disambiguate(subject, metadataKey);
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- if (metadataMap.containsKey(key)) {
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- Collection<MetadataValue> values = metadataMap.get(key).values();
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+ Map<Plugin, MetadataValue> entry = metadataMap.get(key);
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+ if (entry != null) {
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+ Collection<MetadataValue> values = entry.values();
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return Collections.unmodifiableList(new ArrayList<MetadataValue>(values));
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} else {
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return Collections.emptyList();
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@@ -71,7 +75,7 @@ public abstract class MetadataStoreBase<T> {
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* @param metadataKey the unique metadata key being queried.
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* @return the existence of the metadataKey within subject.
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*/
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- public synchronized boolean hasMetadata(T subject, String metadataKey) {
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+ public boolean hasMetadata(T subject, String metadataKey) {
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String key = disambiguate(subject, metadataKey);
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return metadataMap.containsKey(key);
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}
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@@ -87,17 +91,18 @@ public abstract class MetadataStoreBase<T> {
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* org.bukkit.plugin.Plugin)
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* @throws IllegalArgumentException If plugin is null
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*/
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- public synchronized void removeMetadata(T subject, String metadataKey, Plugin owningPlugin) {
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+ public void removeMetadata(T subject, String metadataKey, Plugin owningPlugin) {
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Validate.notNull(owningPlugin, "Plugin cannot be null");
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String key = disambiguate(subject, metadataKey);
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Map<Plugin, MetadataValue> entry = metadataMap.get(key);
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if (entry == null) {
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return;
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}
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-
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- entry.remove(owningPlugin);
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- if (entry.isEmpty()) {
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- metadataMap.remove(key);
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+ synchronized (entry) {
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+ entry.remove(owningPlugin);
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+ if (entry.isEmpty()) {
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+ metadataMap.remove(key);
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+ }
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}
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}
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@@ -110,7 +115,7 @@ public abstract class MetadataStoreBase<T> {
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* @see MetadataStore#invalidateAll(org.bukkit.plugin.Plugin)
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* @throws IllegalArgumentException If plugin is null
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*/
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- public synchronized void invalidateAll(Plugin owningPlugin) {
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+ public void invalidateAll(Plugin owningPlugin) {
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Validate.notNull(owningPlugin, "Plugin cannot be null");
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for (Map<Plugin, MetadataValue> values : metadataMap.values()) {
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if (values.containsKey(owningPlugin)) {
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--
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2.9.2.windows.1
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