simpletimer.java

javahomework(source).rar

import java.util.*;

public class SimpleTimer extends Thread
{
	int  period;
	boolean isValid;
	ArrayList<SimpleTimeTask> tasks;
	
	public SimpleTimer(int period)
	{
		setDaemon(true);
		setPeriod(period);
		tasks=new ArrayList<SimpleTimeTask>();
	}

	public void addTask(SimpleTimeTask task)
	{
		synchronized(this)
		{
			tasks.add(task);
		}
	}
	
	public void setPeriod(int period)
	{
		synchronized(this)
		{
			this.period=period;
			if(this.period<=100)
				this.period=100;
		}
	}
	
	public void run()
	{
		try
		{
			while(true)
			{
				int tmpI;
				synchronized(this)
				{
					tmpI=period;
				}
				sleep(tmpI);
				Iterator<SimpleTimeTask> itr1=null;
				synchronized(this)
				{
					itr1=tasks.iterator();
				}
				while(itr1.hasNext())
				{
					SimpleTimeTask tmp=null;
					synchronized(this)
					{
						tmp=itr1.next();
					}
					tmp.start();
				}
			}
		}catch(InterruptedException e)
		{
			e.printStackTrace();
		}
	}
	
	public void pauseAllTask()
	{
		Iterator<SimpleTimeTask> itr1=null;
		synchronized(this)
		{
			itr1=tasks.iterator();
		}
		while(itr1.hasNext())
		{
			SimpleTimeTask tmp=null;
			synchronized(this)
			{
				tmp=itr1.next();
			}
			tmp.pause();
		}
	}
	
	public void goOnAllTask()
	{
		Iterator<SimpleTimeTask> itr1=null;
		synchronized(this)
		{
			itr1=tasks.iterator();
		}
		while(itr1.hasNext())
		{
			SimpleTimeTask tmp=null;
			synchronized(this)
			{
				tmp=itr1.next();
			}
			tmp.goOn();
		}
	}
}