EJB 3.1 Cookbook

Creating and using programmatic timers

Timers can be created using methods of the TimerService interface. This interface supports methods for creating timers which generate events at a specific time, after an elapsed time, after a specific interval, or according to a schedule. This approach provides the client with the ability to initiate a timer.

Getting ready

There are two basic steps needed to create a programmatic timer:

1. Using a TimerService instance to create the timer, and
2. Declaring a callback method using the @Timeout annotation

   As we will see, there are several TimerService interface methods available to create a timer. Most of these will be explored in the There's more section of this recipe. Initially, we will use the createSingleActionTimer ...