thoerup/schedulesamples/JavaTimer.java

/* using java.util.timer is the most simple but also very inflexible - and It is considered less-than-nice in relation to the app server since
 * it executes the scheduled task in a new background thread that the appserver has no control over.
 * 
 */

package dk.thoerup.schedulesamples;

import java.io.IOException;
import java.util.Calendar;
import java.util.Timer;
import java.util.TimerTask;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class JavaTimer
 */
public class JavaTimer extends HttpServlet {
        private static final long serialVersionUID = 1L;
    
        class MyTask extends TimerTask {
                String str;
                int count = 0;
                
                public MyTask(String s) {
                        str = s;
                }
                
                @Override
                public void run() {
                        System.out.println("MyTask : " + str);
                        
                        count++;
                        if (count >=10)
                                this.cancel(); //cancel efter 10 runs                   
                }
        
                
        }
        
        Timer timer = new Timer();

        
        @Override
        public void destroy() {
                super.destroy();
                timer.cancel(); //remove all pending jobs
        }


        @Override
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
                //schedule a single run,, run after 3 seconds
                //timer.schedule(new MyTask("1"), 3000);
                
                
                //continuous execution first execution after 2 seconds and then with 1 second intervals
                //timer.schedule(new MyTask("2"), 2000, 1000);
                
                //schedule a single run at a specific time
                Calendar cal = Calendar.getInstance();
                cal.set(2010, 5, 1, 14, 40, 0); //months are zero indexed               
                timer.schedule(new MyTask("3"), cal.getTime() );                
                        
                response.getWriter().print("ok");
        }

}
1	torben	772	/* using java.util.timer is the most simple but also very inflexible - and It is considered less-than-nice in relation to the app server since
2			* it executes the scheduled task in a new background thread that the appserver has no control over.
3			*
4			*/
5
6			package dk.thoerup.schedulesamples;
7
8			import java.io.IOException;
9	torben	781	import java.util.Calendar;
10			import java.util.Timer;
11			import java.util.TimerTask;
12
13	torben	772	import javax.servlet.ServletException;
14			import javax.servlet.http.HttpServlet;
15			import javax.servlet.http.HttpServletRequest;
16			import javax.servlet.http.HttpServletResponse;
17
18			/**
19			* Servlet implementation class JavaTimer
20			*/
21			public class JavaTimer extends HttpServlet {
22			private static final long serialVersionUID = 1L;
23	torben	781
24			class MyTask extends TimerTask {
25			String str;
26			int count = 0;
27
28			public MyTask(String s) {
29			str = s;
30			}
31
32			@Override
33			public void run() {
34			System.out.println("MyTask : " + str);
35
36			count++;
37			if (count >=10)
38			this.cancel(); //cancel efter 10 runs
39			}
40
41
42			}
43
44			Timer timer = new Timer();
45	torben	772
46	torben	782
47
48	torben	781	@Override
49	torben	782	public void destroy() {
50			super.destroy();
51			timer.cancel(); //remove all pending jobs
52			}
53
54
55
56			@Override
57	torben	772	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
58	torben	781	//schedule a single run,, run after 3 seconds
59			//timer.schedule(new MyTask("1"), 3000);
60
61
62			//continuous execution first execution after 2 seconds and then with 1 second intervals
63			//timer.schedule(new MyTask("2"), 2000, 1000);
64
65			//schedule a single run at a specific time
66			Calendar cal = Calendar.getInstance();
67			cal.set(2010, 5, 1, 14, 40, 0); //months are zero indexed
68			timer.schedule(new MyTask("3"), cal.getTime() );
69	torben	782
70	torben	781	response.getWriter().print("ok");
71	torben	772	}
72
73			}