001/* 002 * Trident - A Multithreaded Server Alternative 003 * Copyright 2014 The TridentSDK Team 004 * 005 * Licensed under the Apache License, Version 2.0 (the "License"); 006 * you may not use this file except in compliance with the License. 007 * You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package net.tridentsdk.server.chunk; 018 019import net.tridentsdk.server.world.ChunkSection; 020 021import java.util.concurrent.locks.Lock; 022import java.util.concurrent.locks.ReentrantLock; 023import java.util.function.Consumer; 024import java.util.function.Function; 025 026/** 027 * Allows for higher throughput chunk memory I/O for concurrent access 028 * 029 * @author The TridentSDK Team 030 */ 031public class ConcurrentSectionTable { 032 private final ChunkSection[] sections = new ChunkSection[16]; 033 private final Lock[] locks = new Lock[16]; 034 035 public ConcurrentSectionTable() { 036 for (int i = 0; i < 16; i++) { 037 sections[i] = new ChunkSection((byte) i); 038 locks[i] = new ReentrantLock(); 039 } 040 } 041 042 public void lockFully() { 043 for (Lock lock : locks) { 044 lock.lock(); 045 } 046 } 047 048 public void release() { 049 for (Lock lock : locks) { 050 lock.unlock(); 051 } 052 } 053 054 public ChunkSection get(int i) { 055 return sections[i]; 056 } 057 058 public void set(int i, ChunkSection section) { 059 sections[i] = section; 060 } 061 062 public void modify(int i, Consumer<ChunkSection> consumer) { 063 Lock lock = locks[i]; 064 lock.lock(); 065 try { 066 consumer.accept(sections[i]); 067 } finally { 068 lock.unlock(); 069 } 070 } 071 072 public <T> T modifyAndReturn(int i, Function<ChunkSection, T> function) { 073 Lock lock = locks[i]; 074 lock.lock(); 075 try { 076 return function.apply(sections[i]); 077 } finally { 078 lock.unlock(); 079 } 080 } 081}