Common thread pool example code in java

package com.smart.frame.task.autoTask;
import java.util.Collection;
import java.util.Vector;
/**
 * 任务分发器
 */
public class TaskManage extends Thread
{
    protected Vector<Runnable> tasks = new Vector<Runnable>();
    protected boolean running = false;
    protected boolean stopped = false;
    protected boolean paused = false;
    protected boolean killed = false;
    private ThreadPool pool;
    public TaskManage(ThreadPool pool)
    {
        this.pool = pool;
    }
    public void putTask(Runnable task)
    {
        tasks.add(task);
    }
    public void putTasks(Runnable[] tasks)
    {
        for (int i = 0; i < tasks.length; i++)
            this.tasks.add(tasks[i]);
    }
    public void putTasks(Collection<Runnable> tasks)
    {
        this.tasks.addAll(tasks);
    }
    protected Runnable popTask()
    {
        if (tasks.size() > 0) return (Runnable) tasks.remove(0);
        else return null;
    }
    public boolean isRunning()
    {
        return running;
    }
    public void stopTasks()
    {
        stopped = true;
    }
    public void stopTasksSync()
    {
        stopTasks();
        while (isRunning())
        {
            try
            {
                sleep(5);
            }
            catch (InterruptedException e)
            {
                TaskException.getResultMessage(e);
            }
        }
    }
    public void pauseTasks()
    {
        paused = true;
    }
    public void pauseTasksSync()
    {
        pauseTasks();
        while (isRunning())
        {
            try
            {
                sleep(5);
            }
            catch (InterruptedException e)
            {
                TaskException.getResultMessage(e);
            }
        }
    }
    public void kill()
    {
        if (!running) interrupt();
        else killed = true;
    }
    public void killSync()
    {
        kill();
        while (isAlive())
        {
            try
            {
                sleep(5);
            }
            catch (InterruptedException e)
            {
                TaskException.getResultMessage(e);
            }
        }
    }
    public synchronized void startTasks()
    {
        running = true;
        this.notify();
    }
    public synchronized void run()
    {
        try
        {
            while (true)
            {
                if (!running || tasks.size() == 0)
                {
                    pool.notifyForIdleThread();
                    this.wait();
                } 
                else
                {
                    Runnable task;
                    while ((task = popTask()) != null)
                    {
                        task.run();
                        if (stopped)
                        {
                            stopped = false;
                            if (tasks.size() > 0)
                            {
                                tasks.clear();
                                System.out.println(Thread.currentThread().getId() + ": Tasks are stopped");
                                break;
                            }
                        }
                        if (paused)
                        {
                            paused = false;
                            if (tasks.size() > 0)
                            {
                                System.out.println(Thread.currentThread().getId() + ": Tasks are paused");
                                break;
                            }
                        }
                    }
                    running = false;
                }
                if (killed)
                {
                    killed = false;
                    break;
                }
            }
        }
        catch (InterruptedException e)
        {
            TaskException.getResultMessage(e);
            return;
        }
    }
}

package com.smart.frame.task.autoTask;
import java.util.Collection;
import java.util.Iterator;
import java.util.Vector;
/**
 * 线程池
 */
public class ThreadPool
{
    protected int maxPoolSize = TaskConfig.maxPoolSize;
    protected int initPoolSize = TaskConfig.initPoolSize;
    protected Vector<TaskManage> threads = new Vector<TaskManage>();
    protected boolean initialized = false;
    protected boolean hasIdleThread = false;
    public ThreadPool()
    {
        super();
    }
    public ThreadPool(int maxPoolSize, int initPoolSize)
    {
        this.maxPoolSize = maxPoolSize;
        this.initPoolSize = initPoolSize;
    }
    public void init()
    {
        initialized = true;
        for (int i = 0; i < initPoolSize; i++)
        {
            TaskManage thread = new TaskManage(this);
            thread.start();
            threads.add(thread);
        }
    }
    public void setMaxPoolSize(int maxPoolSize)
    {
        this.maxPoolSize = maxPoolSize;
        if (maxPoolSize < getPoolSize()) setPoolSize(maxPoolSize);
    }
    /**
     * 重设当前线程数 若需杀掉某线程，线程不会立刻杀掉，而会等到线程中的事 
     * 务处理完成 但此方法会立刻从线程池中移除该线程，不会等待事务处理结束
     */
    public void setPoolSize(int size)
    {
        if (!initialized)
        {
            initPoolSize = size;
            return;
        }
        else if (size > getPoolSize())
        {
            for (int i = getPoolSize(); i < size && i < maxPoolSize; i++)
            {
                TaskManage thread = new TaskManage(this);
                thread.start();
                threads.add(thread);
            }
        } 
        else if (size < getPoolSize())
        {
            while (getPoolSize() > size)
            {
                TaskManage th = (TaskManage) threads.remove(0);
                th.kill();
            }
        }
    }
    public int getPoolSize()
    {
        return threads.size();
    }
    protected void notifyForIdleThread()
    {
        hasIdleThread = true;
    }
    protected boolean waitForIdleThread()
    {
        hasIdleThread = false;
        while (!hasIdleThread && getPoolSize() >= maxPoolSize)
        {
            try
            {
                Thread.sleep(5);
            }
            catch (InterruptedException e)
            {
                TaskException.getResultMessage(e);
                return false;
            }
        }
        return true;
    }
    public synchronized TaskManage getIdleThread()
    {
        while (true)
        {
            for (Iterator<TaskManage> itr = threads.iterator(); itr.hasNext();)
            {
                TaskManage th = (TaskManage) itr.next();
                if (!th.isRunning()) return th;
            }
            if (getPoolSize() < maxPoolSize)
            {
                TaskManage thread = new TaskManage(this);
                thread.start();
                threads.add(thread);
                return thread;
            }
            if (waitForIdleThread() == false) return null;
        }
    }
    public void processTask(Runnable task)
    {
        TaskManage th = getIdleThread();
        if (th != null)
        {
            th.putTask(task);
            th.startTasks();
        }
    }
    public void processTasksInSingleThread(Runnable[] tasks)
    {
        TaskManage th = getIdleThread();
        if (th != null)
        {
            th.putTasks(tasks);
            th.startTasks();
        }
    }
    public void processTasksInSingleThread(Collection<Runnable> tasks)
    {
        TaskManage th = getIdleThread();
        if (th != null)
        {
            th.putTasks(tasks);
            th.startTasks();
        }
    }
}

package com.smart.frame.task.autoTask;
public class TopTask implements Runnable
{
    private ThreadPool pool;
    public TopTask()
    {
        super();
    }
    public TopTask(ThreadPool pool)
    {
        super();
        this.pool = pool;
    }
    @Override
    public void run()
    {
        init();
        start();
    }
    /**
     * 初始化验证权限、参数之类
     */
    public void init()
    {
    }
    /**
     * 开始自动任务
     */
    public void start()
    {
        for (int i = 0; i < 10; i++)
        {
            pool.processTask(new BeginAuto());
        }
    }
}
/**
 * 实现类
 */
class BeginAuto implements Runnable
{
    @Override
    public void run()
    {
        System.out.println(Thread.currentThread().getId() + "..................");
    }

}

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