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README.adoc

ejb-timer: Example of EJB Timer Service - @Schedule and @Timeout

The ejb-timer quickstart demonstrates how to use the EJB timer service @Schedule and @Timeout annotations with {productName}.

What is it?

The ejb-timer quickstart demonstrates how to use the EJB timer service in {productNameFull}. This example creates a timer service that uses the @Schedule and @Timeout annotations.

The following EJB Timer services are demonstrated:

  • @Schedule: Uses this annotation to mark a method to be executed according to the calendar schedule specified in the attributes of the annotation. This example schedules a message to be printed to the server console every 6 seconds.

  • @Timeout: Uses this annotation to mark a method to execute when a programmatic timer goes off. This example sets the timer to go off every 3 seconds, at which point the method prints a message to the server console.

Access the Application

This application only prints messages to stdout. To see it working, check the server log. You should see similar output:

INFO  [stdout] (EJB default - 10) ScheduleExample.doWork() invoked at 2014.11.25 AD at 11:57:12 EST
INFO  [stdout] (EJB default - 2) TimeoutExample.scheduler() EJB timer service timeout at 2014.11.25 AD at 11:57:12 EST
INFO  [stdout] (EJB default - 4) TimeoutExample.scheduler() EJB timer service timeout at 2014.11.25 AD at 11:57:15 EST
INFO  [stdout] (EJB default - 3) TimeoutExample.scheduler() EJB timer service timeout at 2014.11.25 AD at 11:57:18 EST
INFO  [stdout] (EJB default - 5) ScheduleExample.doWork() invoked at 2014.11.25 AD at 11:57:18 EST
INFO  [stdout] (EJB default -7) TimeoutExample.scheduler() EJB timer service timeout at 2014.11.25 AD at 11:57:21 EST
INFO  [stdout] (EJB default - 9) TimeoutExample.scheduler() EJB timer service timeout at 2014.11.25 AD at 11:57:24 EST
INFO  [stdout] (EJB default - 6) ScheduleExample.doWork() invoked at 2014.11.25 AD at 11:57:24 EST
INFO  [stdout] (EJB default - 8) TimeoutExample.scheduler() EJB timer service timeout at 2014.11.25 AD at 11:57:27 EST
INFO  [stdout] (EJB default - 1) ScheduleExample.doWork() invoked at 2014.11.25 AD at 11:57:30 EST
INFO  [stdout] (EJB default - 10) TimeoutExample.scheduler() EJB timer service timeout at 2014.11.25 AD at 11:57:30 EST
INFO  [stdout] (EJB default - 2) TimeoutExample.scheduler() EJB timer service timeout at 2014.11.25 AD at 11:57:33 EST
INFO  [stdout] (EJB default - 4) ScheduleExample.doWork() invoked at 2014.11.25 AD at 11:57:36 EST
INFO  [stdout] (EJB default - 3) TimeoutExample.scheduler() EJB timer service timeout at 2014.11.25 AD at 11:57:36 EST
INFO  [stdout] (EJB default - 5) TimeoutExample.scheduler() EJB timer service timeout at 2014.11.25 AD at 11:57:39 EST
INFO  [stdout] (EJB default - 7) ScheduleExample.doWork() invoked at 2014.11.25 AD at 11:57:42 EST

Existing threads in the thread pool handle the invocations. They are rotated and the name of the thread that handles the invocation is printed within the parenthesis (EJB Default - #).