papermc/CraftBukkit-Patches/0054-Optimize-DataWatcher.patch

From 02b73438dc5dc43d338764bf2ab9b4a5d3432d52 Mon Sep 17 00:00:00 2001
From: md_5 <git@md-5.net>
Date: Fri, 13 Dec 2013 11:45:47 +1100
Subject: [PATCH] Optimize DataWatcher

Use primitive orientated collections, as well as more effective copies across collections.

diff --git a/src/main/java/net/minecraft/server/DataWatcher.java b/src/main/java/net/minecraft/server/DataWatcher.java
index 2bf9196..aa46c28 100644
--- a/src/main/java/net/minecraft/server/DataWatcher.java
+++ b/src/main/java/net/minecraft/server/DataWatcher.java
@@ -15,8 +15,13 @@ public class DataWatcher {
 
     private final Entity a;
     private boolean b = true;
-    private static final Map<Class<?>, Integer> c = Maps.newHashMap();
-    private final Map<Integer, DataWatcher.WatchableObject> d = Maps.newHashMap();
+    // Spigot Start
+    private static final gnu.trove.map.TObjectIntMap classToId = new gnu.trove.map.hash.TObjectIntHashMap( 10, 0.5f, -1 );
+    private final gnu.trove.map.TIntObjectMap dataValues = new gnu.trove.map.hash.TIntObjectHashMap( 10, 0.5f, -1 );
+    // These exist as an attempt at backwards compatability for (broken) NMS plugins
+    private static final Map<Class<?>, Integer> c = gnu.trove.TDecorators.wrap( classToId );
+    private final Map<Integer, DataWatcher.WatchableObject> d = gnu.trove.TDecorators.wrap( dataValues );
+    // Spigot End
     private boolean e;
     private ReadWriteLock f = new ReentrantReadWriteLock();
 
@@ -25,19 +30,19 @@ public class DataWatcher {
     }
 
     public <T> void a(int i, T t0) {
-        Integer integer = (Integer) DataWatcher.c.get(t0.getClass());
+        int integer = classToId.get(t0.getClass()); // Spigot
 
-        if (integer == null) {
+        if (integer == -1) { // Spigot
             throw new IllegalArgumentException("Unknown data type: " + t0.getClass());
         } else if (i > 31) {
             throw new IllegalArgumentException("Data value id is too big with " + i + "! (Max is " + 31 + ")");
-        } else if (this.d.containsKey(Integer.valueOf(i))) {
+        } else if (this.dataValues.containsKey(i)) { // Spigot
             throw new IllegalArgumentException("Duplicate id value for " + i + "!");
         } else {
-            DataWatcher.WatchableObject datawatcher_watchableobject = new DataWatcher.WatchableObject(integer.intValue(), i, t0);
+            DataWatcher.WatchableObject datawatcher_watchableobject = new DataWatcher.WatchableObject(integer, i, t0); // Spigot
 
             this.f.writeLock().lock();
-            this.d.put(Integer.valueOf(i), datawatcher_watchableobject);
+            this.dataValues.put(i, datawatcher_watchableobject); // Spigot
             this.f.writeLock().unlock();
             this.b = false;
         }
@@ -47,7 +52,7 @@ public class DataWatcher {
         DataWatcher.WatchableObject datawatcher_watchableobject = new DataWatcher.WatchableObject(j, i, (Object) null);
 
         this.f.writeLock().lock();
-        this.d.put(Integer.valueOf(i), datawatcher_watchableobject);
+        this.dataValues.put(i, datawatcher_watchableobject); // Spigot
         this.f.writeLock().unlock();
         this.b = false;
     }
@@ -82,7 +87,7 @@ public class DataWatcher {
         DataWatcher.WatchableObject datawatcher_watchableobject;
 
         try {
-            datawatcher_watchableobject = (DataWatcher.WatchableObject) this.d.get(Integer.valueOf(i));
+            datawatcher_watchableobject = (DataWatcher.WatchableObject) this.dataValues.get(i); // Spigot
         } catch (Throwable throwable) {
             CrashReport crashreport = CrashReport.a(throwable, "Getting synched entity data");
             CrashReportSystemDetails crashreportsystemdetails = crashreport.a("Synched entity data");
@@ -139,7 +144,7 @@ public class DataWatcher {
 
         if (this.e) {
             this.f.readLock().lock();
-            Iterator iterator = this.d.values().iterator();
+            Iterator iterator = this.dataValues.valueCollection().iterator(); // Spigot
 
             while (iterator.hasNext()) {
                 DataWatcher.WatchableObject datawatcher_watchableobject = (DataWatcher.WatchableObject) iterator.next();
@@ -163,7 +168,7 @@ public class DataWatcher {
 
     public void a(PacketDataSerializer packetdataserializer) throws IOException {
         this.f.readLock().lock();
-        Iterator iterator = this.d.values().iterator();
+        Iterator iterator = this.dataValues.valueCollection().iterator(); // Spigot
 
         while (iterator.hasNext()) {
             DataWatcher.WatchableObject datawatcher_watchableobject = (DataWatcher.WatchableObject) iterator.next();
@@ -176,18 +181,11 @@ public class DataWatcher {
     }
 
     public List<DataWatcher.WatchableObject> c() {
-        ArrayList arraylist = null;
+        ArrayList arraylist = Lists.newArrayList(); // Spigot
 
         this.f.readLock().lock();
 
-        DataWatcher.WatchableObject datawatcher_watchableobject;
-
-        for (Iterator iterator = this.d.values().iterator(); iterator.hasNext(); arraylist.add(datawatcher_watchableobject)) {
-            datawatcher_watchableobject = (DataWatcher.WatchableObject) iterator.next();
-            if (arraylist == null) {
-                arraylist = Lists.newArrayList();
-            }
-        }
+        arraylist.addAll(this.dataValues.valueCollection()); // Spigot
 
         this.f.readLock().unlock();
         return arraylist;
@@ -310,14 +308,16 @@ public class DataWatcher {
     }
 
     static {
-        DataWatcher.c.put(Byte.class, Integer.valueOf(0));
-        DataWatcher.c.put(Short.class, Integer.valueOf(1));
-        DataWatcher.c.put(Integer.class, Integer.valueOf(2));
-        DataWatcher.c.put(Float.class, Integer.valueOf(3));
-        DataWatcher.c.put(String.class, Integer.valueOf(4));
-        DataWatcher.c.put(ItemStack.class, Integer.valueOf(5));
-        DataWatcher.c.put(BlockPosition.class, Integer.valueOf(6));
-        DataWatcher.c.put(Vector3f.class, Integer.valueOf(7));
+        // Spigot Start - remove valueOf
+        classToId.put(Byte.class, 0);
+        classToId.put(Short.class, 1);
+        classToId.put(Integer.class, 2);
+        classToId.put(Float.class, 3);
+        classToId.put(String.class, 4);
+        classToId.put(ItemStack.class, 5);
+        classToId.put(BlockPosition.class, 6);
+        classToId.put(Vector3f.class, 7);
+        // Spigot End
     }
 
     public static class WatchableObject {
-- 
2.1.0