package com.dy.common.threadPool;
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import java.util.*;
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import org.apache.logging.log4j.*;
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import com.dy.common.threadPool.ThreadPool.Job;
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public class ThreadPoolImp {
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/**
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* 线程池实现
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* @author Administrator
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*
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*/
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public class MyThreadPool implements ThreadPool.Pool{
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/**
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* 线程池唯一实例
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*/
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public MyThreadPool myPool ;
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/**
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* 线程池名称；
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*/
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private String poolName ;
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/**
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* 空闲线程集合
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*/
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private List<MyThread> freeThreads;
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/**
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* 工作中的线程集合
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*/
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private List<MyThread> busiThreads;
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/**
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* 线程池最大线程数 , 若maxNum <= 0，则maxNum = 1 。
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*/
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private int maxNum;
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/**
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* 最小线程数，若minNum > maxNum，则minNum = maxNum 。
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*/
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private int minNum;
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/**
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* 当前线程池中的线程数。
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*/
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private int currNum;
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/**
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* 空闲线程超时的时长(秒)，超过这个时间，就清除多余线程，
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* 使空闲线程最多是minNum个
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*/
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private long freeTimeout ;
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/**
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* 忙碌线程超时的时长(秒)，超过这个时间，就认为是崩溃线程，将被清除。
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*/
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private long busyTimeout ;
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/**
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* 同步对象
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*/
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private Object synObj = new Object();
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/**
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* 内部启动的空闲和忙碌超时线程的线程
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*/
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private Thread monitorThread ;
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/**
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* 日志
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*/
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private Logger log = LogManager.getLogger(MonitorThread.class.getName());
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/**
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* 得到默认唯一实例
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* @return
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*/
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// public MyThreadPool getDefaultInstance(){
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// if(myPool == null){
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// myPool = new MyThreadPool(null, null, null, null, null) ;
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// }
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// return myPool ;
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// }
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/**
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* 得到唯一实例
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* @param poolName
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* @param maxNum
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* @param minNum
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* @param freeTimeout
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* @param busyTimeout
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* @return
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*/
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// public MyThreadPool getInstance(
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// String poolName ,
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// Integer maxNum ,
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// Integer minNum ,
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// Long freeTimeout ,
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// Long busyTimeout){
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// if(myPool == null){
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// myPool = new MyThreadPool(poolName, maxNum, minNum, freeTimeout, busyTimeout) ;
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// }
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// return myPool ;
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// }
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/**
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* 线程池构造方法
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* @param poolName 线程池和线程名称
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* @param maxNum 线程池最大线程数，若为-1，不受限制
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* @param minNum 线程池最小线程数，或初始线程数
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* @param freeTimeout 空闲线程超时时长(秒)
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* @param busyTimeout 忙碌线程超时时长(秒)，若为-1，不受限制
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*/
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public MyThreadPool(
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String poolName ,
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Integer maxNum ,
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Integer minNum ,
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Long freeTimeout ,
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Long busyTimeout) {
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if(poolName == null){
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poolName="线程池" ;
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}
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this.poolName = poolName ;
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if(maxNum == null || maxNum.intValue() <= 0){
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maxNum = -1 ;
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}
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if(minNum == null || minNum.intValue() < 0){
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minNum = 0 ;
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}
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if(minNum > maxNum){
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minNum = maxNum ;
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}
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this.maxNum = maxNum ;
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this.minNum = minNum ;
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this.currNum = 0;
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if(freeTimeout == null || freeTimeout.longValue() <= 0){
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freeTimeout = 60000L ;
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}
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this.freeTimeout = freeTimeout ;
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if(busyTimeout == null || busyTimeout.longValue() <= 0){
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this.busyTimeout = -1L ;
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}else{
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this.busyTimeout = busyTimeout ;
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}
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this.busiThreads = new ArrayList<MyThread>();
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this.freeThreads = new ArrayList<MyThread>();
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//最小化线程池
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for (int i = 0; i < this.minNum ; i++) {
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MyThread t = new MyThread(this);
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t.start();
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this.freeThreads.add(t);
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this.currNum++;
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}
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this.monitorThread = new MonitorThread(this) ;
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this.monitorThread.start() ;
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}
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/**
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* 把所要执行的工作对象实例放入线程池中
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* @param job ThreadJob 工作对象实例
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* @throws Exception
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*/
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@Override
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public void putJob(Job job) throws Exception {
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synchronized(this.synObj) {
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//log.debug("工作任务分配到线程池中。") ;
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MyThread t = null ;
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if (this.freeThreads.size() == 0) {
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//当前没有空闲线程
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if (this.maxNum == -1 || this.currNum < this.maxNum) {
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//当前线程数未达到最大值 , 增加新的线程
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t = new MyThread(this);
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t.start();
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this.currNum++;
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} else {
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//当前线程达到最大数了，等待回归线程
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while (freeThreads.size() == 0) {
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//如果没有空闲的线程,等待工作线程工作完成回来
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try {
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//log.warn("线程池(" + this.poolName + ")中线程数达到上限，新工作任务等待释放线程!");
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synObj.wait();
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} catch (Exception e) {
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log.error("'" + this.poolName + "'线程池中线程等待释放线时发生等待异常!", e);
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}
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t = (MyThread) freeThreads.get(0);
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if (t != null) {
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//说明得到了释放回来的线程
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freeThreads.remove(0);
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break;
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}else{
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//说明没有得到释放回来的线程，可以其他线程
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continue;
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}
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}//end while
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}//end else
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}//end if(freeThreads.size() == 0)
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else {
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t = (MyThread) freeThreads.get(0);
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freeThreads.remove(0);
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}
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busiThreads.add(t);
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t.putJob(job);
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}
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}
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/**
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* 线程工作完成，从busiThreads回归freeThreads
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*/
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protected void freeThread(MyThread t) {
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synchronized (synObj) {
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busiThreads.remove(t);
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freeThreads.add(t);
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synObj.notify();
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}
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}
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/**
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* 监控超时线程的线程
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* @author Administrator
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*
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*/
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protected class MonitorThread extends Thread {
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private MyThreadPool pool ;
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private MyThread t ;
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private Iterator<?> it ;
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/**
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*
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* @param pool
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*/
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public MonitorThread(MyThreadPool pool){
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this.pool = pool ;
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}
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/**
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*
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*/
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@SuppressWarnings("finally")
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public void run(){
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long interval = pool.freeTimeout ;
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if(pool.busyTimeout > 0 && pool.busyTimeout < pool.freeTimeout){
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interval = pool.busyTimeout ;
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}
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boolean isException = false ;
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while(true){
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t = null ;
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it = null ;
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try{
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MonitorThread.sleep(interval) ;
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}catch(Exception e){
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isException = true ;
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}finally{
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if(isException){
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isException = false ;
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continue ;
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}
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}
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try{
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synchronized (pool.synObj) {
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if(pool.freeThreads.size() > pool.minNum){
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//如果空闲线程大于最小线程数，则清理空闲线程
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int num = pool.freeThreads.size() - pool.minNum ;
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int count = 0 ;
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it = pool.freeThreads.iterator() ;
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while(it.hasNext()){
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if(count == num) {
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break ;
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}
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count ++ ;
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t = (MyThread)it.next() ;
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if((System.currentTimeMillis() - t.time) >= pool.freeTimeout){
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it.remove() ;
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pool.currNum-- ;
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//log.debug("线程池(" + pool.poolName + ")中清除了一个超时空闲线程!");
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t.destroy() ;
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t = null ;
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}
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}
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}//end if
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if(pool.busyTimeout != -1 && pool.busyTimeout > 0){
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it = pool.busiThreads.iterator() ;
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while(it.hasNext()){
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t = (MyThread)it.next() ;
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if((System.currentTimeMillis() - t.time) >= pool.busyTimeout){
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it.remove() ;
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pool.currNum-- ;
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log.error("线程池(" + pool.poolName + ")中清除了一个超时崩溃(忙碌)线程!");
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t.destroy() ;
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t = null ;
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}
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}
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}
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}//end synchronized (pool.synObj)
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}catch(Exception e){
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}finally{
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continue ;
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}
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}//end while(true)
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}
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}
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}
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/**
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* 池中线程实现
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* @author Administrator
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*
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*/
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public class MyThread extends Thread{
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/**
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* 标示线程是活的
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*/
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private boolean living = true ;
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/**
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* 线程忙碌或空闲记时器
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*/
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protected long time ;
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/**
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* 当前线程所处的线程池
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*/
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private MyThreadPool pool ;
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/**
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* 线程具体工作的回调类
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*/
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private Job job ;
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/**
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* 指示线程可以工作
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*/
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private Boolean canJob ;
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private Logger log = LogManager.getLogger(MyThread.class.getName()) ;
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protected MyThread(MyThreadPool pool) {
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super();
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this.pool = pool ;
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this.time = 0 ;
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this.canJob = false ;
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}
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/**
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* 设置线程工作对象
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* @param job
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*/
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protected void putJob(Job job) throws Exception {
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if(job == null){
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this.job = new Job(){
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public void execute(){
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}
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public void destroy(){
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}
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public boolean isDestroy(){
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return false ;
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}
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};
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}
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synchronized (this) {
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this.job = job ;
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this.canJob = true;
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//忙碌记时开始
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this.time = System.currentTimeMillis() ;
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this.notify();
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}
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}
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/**
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*
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*/
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@SuppressWarnings("finally")
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@Override
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public void run(){
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while (living){
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synchronized (this){
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while(!canJob){
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//当不能工作时
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try{
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this.wait();
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}catch (Exception e) {
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log.error("线程池(" + pool.poolName + ")的工作线程等待可以工作的信号时发生等待异常:\n" + e.getMessage(), e);
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this.canJob = false ;
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continue;
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}
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}
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///////////////////////
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//被唤醒，有新工作了
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try{
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if(this.job != null){
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this.job.execute() ;
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}
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}catch (Exception ee) {
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log.error("线程池(" + pool.poolName + ")的工作线程在执行工作时发生异常:\n" + ee.getMessage(), ee);
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//ee.printStackTrace() ;
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}finally {
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this.canJob = false ;
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this.job = null ;
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if(living){
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//线程未被销毁
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this.free() ;
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}
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continue;
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}
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}// end synchronized(this)
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}// end while(living)
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}
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public void free(){
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//使本线程回归空闲线程池
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pool.freeThread(this);
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//空闲开始记时
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this.time = System.currentTimeMillis() ;
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// 没有可做的了
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this.canJob = false;
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log.debug("线程池(" + this.pool.poolName + ")中的线程回归空闲集合。");
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}
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/**
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* 销毁工作线程
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*/
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public void destroy() {
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//线程销毁前，首先把其所持有的工作销毁，否则线程停不下来，也销毁不了
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if(this.job != null){
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this.job.destroy();
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}
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this.living = false ;//使线程从run方法的长久while(living)中退出来，从线程自动销毁
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this.job = null ;
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}
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}
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}
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