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    <p><strong>@Schedule</strong></p> <p>If you are using Ejb 3.1 (glassfish 3.x), you may use the @Schedule annotation to have the container invoke a method in a specified interval or at a given calendar time. Allowing you to avoid handling threads in your own code</p> <p><a href="http://docs.oracle.com/javaee/6/tutorial/doc/bnboy.html" rel="nofollow">Read about ejb 3.1 timer</a></p> <pre><code>@Stateless public class LabbBean { @EJB WorkerEjb workerEjb; @Schedule(second="*/5", minute="*",hour="*", persistent=false) public void myMethod() { for (all jobs found in db){ workerEjb.workerMethod(job); } } } @Stateless public class WorkerEjb { @Asynchronous public void workerMethod(job) { //Send emails } } </code></pre> <p>If you wanted to do the work in separate threads, the @Schedule annotated method could call a worker-ejb with the worker-method annotated as @Asynchronous</p> <p><strong>@Timeout</strong></p> <p>I just realised you wanted the schedule to be initiated from the database. An option the would be to initiate a bunch of timers programmatically using a @Singleton ejb with @Startup annotation. The timeout annotated method would be called in separate threads if some timers run out at the same time.</p> <pre><code>@Singleton @Startup public class LabbBean { @Resource protected TimerService timerService; @PostConstruct public void init() { //Init your timers from the data in the database here for (all your timers) { TimerConfig config = new TimerConfig(); config.setInfo("timer1"); config.setPersistent(false); ScheduleExpression schedule = new ScheduleExpression(); schedule.dayOfMonth(10); schedule.minute(2); timerService.createCalendarTimer(schedule, config); } } //method called when timeout occurs @Timeout public void timeoutHandler(Timer timer) { String name = timer.getInfo().toString(); System.out.println("Timer name=" + name); } } </code></pre>
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    1. USAksel Willgert
    1. USAksel Willgert
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    1. COThe ideal would be that I could make sub Threads to spread out the work of the heavy work. So the main thread that listens for scheduled tasks, is ready to take on a new task. How would you solve that?
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      1. USAndré Snede Kock
    2. COAdded some alternatives you can try out.
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      1. USAksel Willgert
    3. COThanks alot for your great answers, while your way seems like the best way, it shows me that it isn't a good idea to let this application live inside GlassFish. I need to make a separate application for this.
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      1. USAndré Snede Kock
 

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