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线程池的实现例子1

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import java.util.LinkedList;
import java.util.List;


public class ThreadPool ...{

    private static ThreadPool instance = null;

    // 优先级低
    public static final int PRIORITY_LOW = 0;

    // 普通
    public static final int PRIORITY_NORMAL = 1;

    // 高
    public static final int PRIORITY_HIGH = 2;

    // 用以保存空闲连接
    private List[] _idxThreads;

    // 关闭
    private boolean _shutdown = false;

    // 线程数量
    private int _threadCount = 0;

    // debug信息是否输出
    private boolean _debug = false;

    /** *//**
     * 返回ThreadPool实例
     *
     * @return
     */
    public static ThreadPool getInstance() ...{
        if (instance == null) ...{
                    instance = new ThreadPool();
            }
        return instance;
    }

    // 初始化线程list
    private ThreadPool() ...{
        this._idxThreads = new List[] ...{ new LinkedList(), new LinkedList(),
                new LinkedList() };
        this._threadCount=0;
    }

    /** *//**
     * 同步方法,完成任务后将资源放回线程池中
     * @param repool
     */
    protected synchronized void repool(Pooled repool) ...{
        if (this._shutdown) ...{
            if (this._debug) ...{
                System.out.println("ThreadPool.repool():重设中……");
            }
            // 优先级别判定
            switch (repool.getPriority()) ...{
            case Thread.MIN_PRIORITY:
                this._idxThreads[PRIORITY_LOW].add(repool);
                break;
            case Thread.NORM_PRIORITY:
                this._idxThreads[PRIORITY_NORMAL].add(repool);
                break;
            case Thread.MAX_PRIORITY:
                this._idxThreads[PRIORITY_HIGH].add(repool);
                break;
            default:
                throw new IllegalStateException("没有此种级别");
            }
            // 通知所有线程
            notifyAll();

        } else ...{
            if (this._debug) ...{
                System.out.println("ThreadPool.repool():注销中……");
            }
            repool.shutDown();
        }
        if(this._debug)...{
            System.out.println("ThreadPool.repool():完成");
        }
    }
    public void setDebug(boolean debug)...{
        this._debug=debug;
    }
    public synchronized  void shutDown()...{
        this._shutdown=true;
        if(this._debug)...{
            System.out.println("ThreadPool.shutDown():关闭中……");
        }
        for(int index=0;index<=PRIORITY_NORMAL;index++)...{
            List threads=this._idxThreads[index];
            for(int threadIndex=0;threadIndex<threads.size();threadIndex++)...{
                Pooled idleThread=(Pooled)threads.get(threadIndex);
                idleThread.shutDown();
            }
        }
        notifyAll();
    }
   
    /** *//**
     * 以指定的优先级启动线程
     * @param target
     * @param priority
     */
    public synchronized void start(Runnable target,int priority)...{
        Pooled thread=null;
        List idleList=this._idxThreads[priority];
        int idleSize=idleList.size();

        if(idleSize>0)...{
            int lastIndex=idleSize-1;
            thread=(Pooled)idleList.get(lastIndex);
            idleList.remove(idleList);
            thread.setTarget(target);
        }else...{
            this._threadCount++;
            thread=new Pooled(target,"Pooled->"+this._threadCount,this);
            switch(priority)...{
           
            case PRIORITY_LOW:
                thread.setPriority(Thread.MIN_PRIORITY);
                break;
            case PRIORITY_NORMAL:
                thread.setPriority(Thread.NORM_PRIORITY);
                break;
            case PRIORITY_HIGH:
                thread.setPriority(Thread.MAX_PRIORITY);
                break;
                default:
                    thread.setPriority(Thread.NORM_PRIORITY);
            }
            //启动
            thread.start();
   
            }
       
       
    }

    /** *//**
     * 返回线程数量
     *
     * @return
     */
    public int getThreadsCount() ...{
        return this._threadCount;
    }

}

Pooled.java:
package org.loon.framework.util.test;


public class Pooled extends Thread ...{

    private ThreadPool _pool;

    private Runnable _target;

    private boolean _shutdown = false;

    private boolean _idle = false;

    public Pooled(Runnable target) ...{
        super(target);
    }

    public Pooled(Runnable target, String name) ...{
        super(target, name);
    }

    public Pooled(Runnable target, String name, ThreadPool pool) ...{
        super(name);
        this._pool = pool;
        this._target = target;
    }

    public Pooled(String name) ...{
        super(name);
    }

    public Pooled(ThreadGroup group, Runnable target) ...{
        super(group, target);
    }

    public Pooled(ThreadGroup group, Runnable target, String name) ...{
        super(group, target, name);
    }

    public Pooled(ThreadGroup group, String name) ...{
        super(group, name);
    }

    public Runnable getTarget() ...{
        return this._target;
    }

    public boolean isIdle() ...{
        return this._idle;
    }

    public void run() ...{
        while (!this._shutdown) ...{
            this._idle = false;
            if (this._target != null) ...{
                this._target.run();
            }
            this._idle = true;
            try ...{

                this._pool.repool(this);

                synchronized (this) ...{
                    wait();
                }

            } catch (InterruptedException ex) ...{
                System.err.println(ex.getMessage());
            }
            this._idle = false;
        }
    }

    public synchronized void setTarget(Runnable target) ...{
        this._target = target;
        notifyAll();
    }

    public synchronized void shutDown() ...{
        this._shutdown = true;
        notifyAll();
    }

}

测试用类:

public class ThreadPoolTest ...{

   
    private static Runnable createRunnable(final int id) ...{
        return new Runnable() ...{
            public void run() ...{
                System.out.println("线程" + id + ",运行 ");
                try ...{
                    Thread.sleep(1000);
                }
                catch (InterruptedException ex) ...{ }
                System.out.println("线程" + id + ",结束");
            }
        };
    }
   
    public static void main(String[]args)...{
        ThreadPool pool=ThreadPool.getInstance();
        pool.setDebug(true);
         for (int i=1; i<=10; i++) ...{
             //根据数值,设定不同优先级
             if(i%2==0)...{
                     pool.start(createRunnable(i), ThreadPool.PRIORITY_HIGH);
             }else...{
                     pool.start(createRunnable(i), ThreadPool.PRIORITY_LOW);
             }
         }
        System.out.println("线程池测试中……");
        System.out.println("线程池线程总数:"+pool.getThreadsCount());
        pool.shutDown();
    }
}
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评论
4 楼 helloguoxing 2010-08-12  
//测试类的代码,我稍微改装了下。
package com.soufang.test;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class ThreadPoolTest {

	private static Runnable createRunnable(final int id){
		return new Runnable(){
			public void run(){
				System.out.println("线程"+id+",运行");
				try{
					Thread.sleep(1000);
				}catch(InterruptedException e){
					System.out.println("线程"+id+",结束");
				}
			}
		};
	}
	
	public static void testThread(){
		ThreadPool pool=ThreadPool.getInstance();
		pool.setDebug(true);
		for(int i=1;i<=10;i++){
			//根据数值,设定不同优先级
			if(i%2==0){
				pool.start(createRunnable(i), ThreadPool.PRIORITY_HIGH);
			}else{
				pool.start(createRunnable(i), ThreadPool.PRIORITY_LOW);
			}
		}
		//System.out.println("线程池线程总数:"+pool.getThreadsCount());
		pool.shutDown();
	}
	
	public static String read(){
		String read="";
		BufferedReader buffer=new BufferedReader(new InputStreamReader(System.in));
		try {
			boolean bl=true;
			while(bl){
				read=buffer.readLine();
				//关闭连接
				if(read.contains(";")){
					bl=false;
				}
			}
				
				
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		return read;
	}
	
	public void toto(){
		ThreadPool pool=ThreadPool.getInstance();
		
				String count=read();
				if(""!=count && !"".equals(count)){
					if(count.contains("1")){
						testThread();
						toto();
					}else if(count.contains("2")){
						pool.shutDown();
						toto();
					}else if(count.contains("3")){
						System.out.println("线程池线程总数:"+pool.getThreadsCount());
						toto();
					}else if(count.contains("4")){
						System.out.println("线程池测试中......");
						toto();
					}else if(count.contains("5")){
						System.out.println("欢迎使用!");
					}else{
						System.out.println("请重新输入:1、启动线程 2、关闭线程 3、查询当前线程池所有线程数量 4、线程池当前状态 5、退出程序");
						toto();
					}
				}
	}
	
	public static void main(String[] args){
		ThreadPoolTest threadtest=new ThreadPoolTest();
		System.out.println("请重新输入:1、启动线程 2、关闭线程 3、查询当前线程池所有线程数量 4、线程池当前状态 5、退出程序");
		threadtest.toto();
		
	}
}

3 楼 helloguoxing 2010-08-12  
请重新输入:1、启动线程 2、关闭线程 3、查询当前线程池所有线程数量 4、线程池当前状态 5、退出程序
1
1;
线程2,运行
线程4,运行
线程6,运行
线程1,运行
线程8,运行
ThreadPool.shutDown();关闭中。。。。。。
线程10,运行
线程7,运行
线程5,运行
线程3,运行
线程9,运行
ThreadPool.repool():重设中。。。。。。
ThreadPool.repool();完成
ThreadPool.repool():重设中。。。。。。
ThreadPool.repool();完成
ThreadPool.repool():重设中。。。。。。
ThreadPool.repool();完成
ThreadPool.repool():重设中。。。。。。
ThreadPool.repool();完成
ThreadPool.repool():重设中。。。。。。
ThreadPool.repool();完成
ThreadPool.repool():重设中。。。。。。
ThreadPool.repool();完成
ThreadPool.repool():重设中。。。。。。
ThreadPool.repool();完成
ThreadPool.repool():重设中。。。。。。
ThreadPool.repool();完成
ThreadPool.repool():重设中。。。。。。
ThreadPool.repool();完成
ThreadPool.repool():重设中。。。。。。
ThreadPool.repool();完成
2;
ThreadPool.shutDown();关闭中。。。。。。
3;
线程池线程总数:10
4;
线程池测试中......
5;
欢迎使用!
5;
5;

//唯一的问题,就是输入5的时候不能退出来。不知道楼主有没有发现。
2 楼 helloguoxing 2010-08-12  
请重新输入:1、启动线程 2、关闭线程 3、查询当前线程池所有线程数量
1
请重新输入:1、启动线程 2、关闭线程 3、查询当前线程池所有线程数量
线程2,运行
线程4,运行
线程6,运行
线程8,运行
线程池测试中......
线程10,运行
线程池线程总数:10
ThreadPool.shutDown();关闭中。。。。。。
ThreadPool.shutDown();关闭中。。。。。。
线程1,运行
线程3,运行
线程5,运行
线程7,运行
线程9,运行
ThreadPool.repool():重设中。。。。。。
ThreadPool.repool();完成
ThreadPool.repool():重设中。。。。。。
ThreadPool.repool();完成
ThreadPool.repool():重设中。。。。。。
ThreadPool.repool();完成
ThreadPool.repool():重设中。。。。。。
ThreadPool.repool();完成
ThreadPool.repool():重设中。。。。。。
ThreadPool.repool();完成
ThreadPool.repool():重设中。。。。。。
ThreadPool.repool();完成
ThreadPool.repool():重设中。。。。。。
ThreadPool.repool();完成
ThreadPool.repool():重设中。。。。。。
ThreadPool.repool();完成
ThreadPool.repool():重设中。。。。。。
ThreadPool.repool();完成
ThreadPool.repool():重设中。。。。。。
ThreadPool.repool();完成
1 楼 helloguoxing 2010-08-12  
楼主这个线程池写的不错,我运行了下,优点略懂。

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