Remove legacy Chunk cache. Fixes BUKKIT-1400

src/main/java/net/minecraft/server/Chunk.java

@@ -7,8 +7,11 @@ import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 import java.util.Random;
-import org.bukkit.Bukkit; // CraftBukkit
+
-import org.bukkit.craftbukkit.util.UnsafeList; // CraftBukkit
+// CraftBukkit start
+import org.bukkit.Bukkit;
+import org.bukkit.craftbukkit.util.UnsafeList;
+// CraftBukkit end
 
 public class Chunk {
 
@@ -62,13 +65,9 @@ public class Chunk {
 
         // CraftBukkit start
         if (!(this instanceof EmptyChunk)) {
-            org.bukkit.craftbukkit.CraftWorld cworld = this.world.getWorld();
-            this.bukkitChunk = (cworld == null) ? null : cworld.popPreservedChunk(i, j);
-            if (this.bukkitChunk == null) {
             this.bukkitChunk = new org.bukkit.craftbukkit.CraftChunk(this);
         }
     }
-    }
 
     public org.bukkit.Chunk bukkitChunk;
     // CraftBukkit end

src/main/java/net/minecraft/server/ChunkProviderServer.java

@@ -241,8 +241,6 @@ public class ChunkProviderServer implements IChunkProvider {
                 ChunkUnloadEvent event = new ChunkUnloadEvent(chunk.bukkitChunk);
                 server.getPluginManager().callEvent(event);
                 if (!event.isCancelled()) {
-                    this.world.getWorld().preserveChunk((CraftChunk) chunk.bukkitChunk);
-
                     chunk.removeEntities();
                     this.saveChunk(chunk);
                     this.saveChunkNOP(chunk);

src/main/java/org/bukkit/craftbukkit/CraftWorld.java

@@ -1,8 +1,13 @@
 package org.bukkit.craftbukkit;
 
-import com.google.common.collect.MapMaker;
 import java.io.File;
 import java.util.Set;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Random;
+import java.util.UUID;
 import org.apache.commons.lang.Validate;
 
 import org.bukkit.craftbukkit.entity.*;
@@ -10,14 +15,6 @@ import org.bukkit.craftbukkit.metadata.BlockMetadataStore;
 import org.bukkit.entity.*;
 import org.bukkit.entity.Entity;
 
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.HashSet;
-import java.util.concurrent.ConcurrentMap;
-import java.util.List;
-import java.util.Random;
-import java.util.UUID;
-
 import net.minecraft.server.*;
 
 import org.bukkit.entity.Arrow;
@@ -52,7 +49,6 @@ public class CraftWorld implements World {
     private final WorldServer world;
     private Environment environment;
     private final CraftServer server = (CraftServer) Bukkit.getServer();
-    private ConcurrentMap<Integer, CraftChunk> unloadedChunks = new MapMaker().weakValues().makeMap();
     private final ChunkGenerator generator;
     private final List<BlockPopulator> populators = new ArrayList<BlockPopulator>();
     private final BlockMetadataStore blockMetadata = new BlockMetadataStore(this);
@@ -69,15 +65,6 @@ public class CraftWorld implements World {
         environment = env;
     }
 
-    public void preserveChunk(CraftChunk chunk) {
-        chunk.breakLink();
-        unloadedChunks.put((chunk.getX() << 16) + chunk.getZ(), chunk);
-    }
-
-    public Chunk popPreservedChunk(int x, int z) {
-        return unloadedChunks.remove((x << 16) + z);
-    }
-
     public Block getBlockAt(int x, int y, int z) {
         return getChunkAt(x >> 4, z >> 4).getBlock(x & 0xF, y & 0xFF, z & 0xF);
     }
@@ -181,7 +168,6 @@ public class CraftWorld implements World {
             world.chunkProviderServer.saveChunkNOP(chunk);
         }
 
-        preserveChunk((CraftChunk) chunk.bukkitChunk);
         world.chunkProviderServer.unloadQueue.remove(x, z);
         world.chunkProviderServer.chunks.remove(x, z);
         world.chunkProviderServer.chunkList.remove(chunk);