114 lines
3.9 KiB
Java
114 lines
3.9 KiB
Java
/*
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* ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
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* Copyright (C) 2012 Kristian S. Stangeland
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*
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* This program is free software; you can redistribute it and/or modify it under the terms of the
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* GNU General Public License as published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with this program;
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* if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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* 02111-1307 USA
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*/
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package com.comphenix.protocol.injector;
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import java.util.HashSet;
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import java.util.Set;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.ConcurrentMap;
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import net.minecraft.server.Packet;
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import com.comphenix.protocol.reflect.StructureModifier;
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import com.comphenix.protocol.reflect.compiler.BackgroundCompiler;
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import com.comphenix.protocol.reflect.compiler.CompileListener;
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import com.comphenix.protocol.reflect.compiler.CompiledStructureModifier;
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/**
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* Caches structure modifiers.
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* @author Kristian
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*/
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public class StructureCache {
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// Structure modifiers
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private static ConcurrentMap<Integer, StructureModifier<Object>> structureModifiers =
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new ConcurrentHashMap<Integer, StructureModifier<Object>>();
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private static Set<Integer> compiling = new HashSet<Integer>();
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/**
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* Creates an empty Minecraft packet of the given ID.
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* @param id - packet ID.
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* @return Created packet.
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*/
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public static Packet newPacket(int id) {
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try {
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return (Packet) MinecraftRegistry.getPacketClassFromID(id, true).newInstance();
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} catch (InstantiationException e) {
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return null;
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} catch (IllegalAccessException e) {
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throw new RuntimeException("Access denied.", e);
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}
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}
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/**
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* Retrieve a cached structure modifier for the given packet id.
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* @param id - packet ID.
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* @return A structure modifier.
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*/
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public static StructureModifier<Object> getStructure(int id) {
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// Compile structures by default
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return getStructure(id, true);
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}
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/**
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* Retrieve a cached structure modifier for the given packet id.
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* @param id - packet ID.
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* @param compile - whether or not to asynchronously compile the structure modifier.
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* @return A structure modifier.
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*/
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public static StructureModifier<Object> getStructure(int id, boolean compile) {
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StructureModifier<Object> result = structureModifiers.get(id);
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// We don't want to create this for every lookup
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if (result == null) {
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// Use the vanilla class definition
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final StructureModifier<Object> value = new StructureModifier<Object>(
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MinecraftRegistry.getPacketClassFromID(id, true), Packet.class, true);
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result = structureModifiers.putIfAbsent(id, value);
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// We may end up creating multiple modifiers, but we'll agree on which to use
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if (result == null) {
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result = value;
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}
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}
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// Automatically compile the structure modifier
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if (compile && !(result instanceof CompiledStructureModifier)) {
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// Compilation is many orders of magnitude slower than synchronization
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synchronized (compiling) {
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final int idCopy = id;
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final BackgroundCompiler compiler = BackgroundCompiler.getInstance();
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if (!compiling.contains(id) && compiler != null) {
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compiler.scheduleCompilation(result, new CompileListener<Object>() {
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@Override
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public void onCompiled(StructureModifier<Object> compiledModifier) {
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structureModifiers.put(idCopy, compiledModifier);
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}
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});
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compiling.add(id);
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}
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}
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}
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return result;
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}
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}
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