task.java

来自「导出ORACLE数据库对象DDL语句的程序」· Java 代码 · 共 100 行

/** 
 * Created on 2004-9-3 完成
 * @author zhangp
 * @version 1.0
 * 任务基类
 * usage: 扩展任务基类,覆盖run方法(执行具体的任务)
 * eg.1:
	Task task=new Task(){
		public void onTimer() {
			System.out.println("task2 "+System.currentTimeMillis());
		}
	};
	task.start(0,1000);
 * eg.2:
   class MyTask extends Task(){
   		public void onTimer() {
			System.out.println("task2 "+System.currentTimeMillis());
		}
   }
   Task task=new MyTask();
   task.start(0,1000);
 */
package com.icbcsdc.ddlexp.pub.util;
import java.util.Timer;
import java.util.TimerTask;
abstract public class Task {
	
	private Timer timer = new Timer();
	private TimerTask task = new TimerTask() {
		public void run() {
			onTimer();
		}
	};
	//private int count = 0;
	private int delay=0;
	private int interval=0;
	private boolean start=false;
	public Task() {
	}
	public Task(int delay,int interval) {
		this.delay=delay;
		this.interval=interval;
	}
	//to be overide
	abstract public void onTimer();

	//停止任务的执行
	public void stop(){
		timer.cancel();
		start=false;
	}
	//delay 延迟的秒数, interval间隔时间
	public void start(int delay, int interval) {
		this.delay=delay;
		this.interval=interval;
		start();
	}
	public void start(){
		if(this.interval==0) {
			System.out.println("Task Error: not set interval");
			return;
		} 
		timer.schedule(task,this.delay,this.interval);
		start=true;
	}
	/**
	 * 任务是否已启动
	 * @return boolean true-started false-stopped
	 */
	public boolean isStarted(){return start;}
	
	
	
    /**
     * @return Returns the delay.
     */
    public int getDelay() {
        return delay;
    }
    /**
     * @param delay The delay to set.
     */
    public void setDelay(int delay) {
        this.delay = delay;
    }
    /**
     * @return Returns the interval.
     */
    public int getInterval() {
        return interval;
    }
    /**
     * @param interval The interval to set.
     */
    public void setInterval(int interval) {
        this.interval = interval;
    }
}