104 lines
4.5 KiB
Diff
104 lines
4.5 KiB
Diff
From beb8d7152eb7655368b1dffaab07ce6b87f84ef7 Mon Sep 17 00:00:00 2001
|
|
From: egg82 <phantom_zero@ymail.com>
|
|
Date: Tue, 7 Aug 2018 01:24:23 -0600
|
|
Subject: [PATCH] Use ConcurrentHashMap in JsonList
|
|
|
|
This is specifically aimed at fixing #471
|
|
|
|
Using a ConcurrentHashMap because thread safety
|
|
The performance benefit of Map over ConcurrentMap is negligabe at best in this scenaio, as most operations will be get and not add or remove
|
|
Even without considering the use-case the benefits are still negligable
|
|
|
|
Original ideas for the system included an expiration policy and/or handler
|
|
The simpler solution was to use a computeIfPresent in the get method
|
|
This will simultaneously have an O(1) lookup time and automatically expire any values
|
|
Since the get method (nor other similar methods) don't seem to have a critical need to flush the map to disk at any of these points further processing is simply wasteful
|
|
Meaning the original function expired values unrelated to the current value without actually having any explicit need to
|
|
|
|
The h method was heavily modified to be much more efficient in its processing
|
|
Also instead of being called on every get, it's now called just before a save
|
|
This will eliminate stale values being flushed to disk
|
|
|
|
Modified isEmpty to use the isEmpty() method instead of the slightly confusing size() < 1
|
|
The point of this is readability, but does have a side-benefit of a small microptimization
|
|
|
|
Finally, added a couple obfhelpers for the modified code
|
|
|
|
diff --git a/src/main/java/net/minecraft/server/JsonList.java b/src/main/java/net/minecraft/server/JsonList.java
|
|
index 04f98167d..c169d0176 100644
|
|
--- a/src/main/java/net/minecraft/server/JsonList.java
|
|
+++ b/src/main/java/net/minecraft/server/JsonList.java
|
|
@@ -35,7 +35,8 @@ public class JsonList<K, V extends JsonListEntry<K>> {
|
|
protected static final Logger LOGGER = LogManager.getLogger();
|
|
protected final Gson b;
|
|
private final File c;
|
|
- private final Map<String, V> d = Maps.newHashMap();
|
|
+ // Paper - replace HashMap is ConcurrentHashMap
|
|
+ private final Map<String, V> d = Maps.newConcurrentMap(); private final Map<String, V> getBackingMap() { return this.d; } // Paper - OBFHELPER
|
|
private boolean e = true;
|
|
private static final ParameterizedType f = new ParameterizedType() {
|
|
public Type[] getActualTypeArguments() {
|
|
@@ -84,8 +85,13 @@ public class JsonList<K, V extends JsonListEntry<K>> {
|
|
|
|
@Nullable
|
|
public V get(K k0) {
|
|
- this.h();
|
|
- return (V) this.d.get(this.a(k0)); // CraftBukkit - fix decompile error
|
|
+ // Paper start
|
|
+ // this.h();
|
|
+ // return (V) this.d.get(this.a(k0)); // CraftBukkit - fix decompile error
|
|
+ return (V) this.getBackingMap().computeIfPresent(this.getMappingKey(k0), (k, v) -> {
|
|
+ return v.hasExpired() ? null : v;
|
|
+ });
|
|
+ // Paper end
|
|
}
|
|
|
|
public void remove(K k0) {
|
|
@@ -114,9 +120,11 @@ public class JsonList<K, V extends JsonListEntry<K>> {
|
|
// CraftBukkit end
|
|
|
|
public boolean isEmpty() {
|
|
- return this.d.size() < 1;
|
|
+ // return this.d.size() < 1; // Paper
|
|
+ return this.getBackingMap().isEmpty(); // Paper - readability is the goal. As an aside, isEmpty() uses only sumCount() and a comparison. size() uses sumCount(), casts, and boolean logic
|
|
}
|
|
|
|
+ protected final String getMappingKey(K k0) { return a(k0); } // Paper - OBFHELPER
|
|
protected String a(K k0) {
|
|
return k0.toString();
|
|
}
|
|
@@ -125,8 +133,9 @@ public class JsonList<K, V extends JsonListEntry<K>> {
|
|
return this.d.containsKey(this.a(k0));
|
|
}
|
|
|
|
+ private void removeStaleEntries() { h(); } // Paper - OBFHELPER
|
|
private void h() {
|
|
- List<K> list = Lists.newArrayList();
|
|
+ /*List<K> list = Lists.newArrayList();
|
|
Iterator iterator = this.d.values().iterator();
|
|
|
|
while (iterator.hasNext()) {
|
|
@@ -143,8 +152,10 @@ public class JsonList<K, V extends JsonListEntry<K>> {
|
|
K k0 = (K) iterator.next(); // CraftBukkit - decompile error
|
|
|
|
this.d.remove(this.a(k0));
|
|
- }
|
|
+ }*/
|
|
|
|
+ this.getBackingMap().values().removeIf(JsonListEntry::hasExpired);
|
|
+ // Paper end
|
|
}
|
|
|
|
protected JsonListEntry<K> a(JsonObject jsonobject) {
|
|
@@ -156,6 +167,7 @@ public class JsonList<K, V extends JsonListEntry<K>> {
|
|
}
|
|
|
|
public void save() throws IOException {
|
|
+ this.removeStaleEntries(); // Paper - remove expired values before saving
|
|
Collection<V> collection = this.d.values();
|
|
String s = this.b.toJson(collection);
|
|
BufferedWriter bufferedwriter = null;
|
|
--
|
|
2.21.0
|
|
|