初次学习多线程——自己写的一个线程池
1 package com.lovo.threadpool; 2 3 public class ThreadOfPool extends Thread{ 4 private Runnable task = null; 5 private ThreadPool threadPool; 6 private boolean stop = false;//线程状态 7 public ThreadOfPool() { 8 } 9 public ThreadOfPool(ThreadPool threadPool) { 10 this.threadPool = threadPool; 11 } 12 /** 13 * 给线程分配指定的任务 14 * @param task 15 */ 16 public synchronized void setTask(Runnable task) { 17 this.task = task; 18 notify(); 19 } 20 /** 21 * 线程执行 22 */ 23 private synchronized void executeTask() { 24 while (!stop) { 25 while (!stop && task == null) { 26 try { 27 wait(); 28 } catch (InterruptedException e) { 29 stop = true; 30 } 31 } 32 if (task != null) { 33 task.run(); 34 task = null; 35 threadPool.free(this); 36 } 37 } 38 } 39 @Override 40 public void run() { 41 executeTask(); 42 } 43 public Runnable getTask() { 44 return task; 45 } 46 public void setStop(boolean stop) { 47 this.stop = stop; 48 } 49 50 }
1 package com.lovo.threadpool; 2 3 import java.util.ArrayList; 4 import java.util.List; 5 6 public class ThreadPool { 7 private List<Thread> freeThreads = new ArrayList<Thread>();//空闲线程(可用) 8 private List<Thread> usingThreads = new ArrayList<Thread>();//正在被使用的线程(不可用) 9 private int POOL_SIZE = 5; 10 public ThreadPool(){ 11 this(POOL_SIZE); 12 } 13 public ThreadPool(int num){ 14 POOL_SIZE = num; 15 for (int i = 0; i < POOL_SIZE; i++) { 16 ThreadOfPool tempThread = new ThreadOfPool(this); 17 tempThread.start(); 18 freeThreads.add(tempThread); 19 } 20 } 21 /** 22 * 分配一个线程 23 * @param t 24 */ 25 public synchronized void execute(Runnable t) { 26 while (freeThreads.isEmpty()) { 27 // System.out.println("线程池繁忙,请等待!"); 28 try { 29 wait(); 30 } catch (InterruptedException e) { 31 e.printStackTrace(); 32 } 33 } 34 ThreadOfPool tempthread= (ThreadOfPool) freeThreads.remove(freeThreads.size() - 1); 35 usingThreads.add(tempthread); 36 tempthread.setTask(t); 37 } 38 /** 39 * 分配的线程用完后的回收处理 40 * @param threadOfPool 41 */ 42 public synchronized void free(ThreadOfPool threadOfPool) { 43 usingThreads.remove(threadOfPool); 44 freeThreads.add(threadOfPool); 45 notify(); 46 } 47 /** 48 * 关闭线程池 49 */ 50 public void close() { 51 while (freeThreads.size() < POOL_SIZE) {} 52 for (Thread thread : freeThreads) { 53 thread.interrupt(); 54 } 55 } 56 }
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