21.3 Asynchronous timer processing by using TimerManager

This section describes the asynchronous timer processing by using TimerManager.

The following table describes the organization of this section.

Table 21‒10:  Organization of this section (Asynchronous timer processing by using TimerManager)

Category	Title	Reference location
Description	Threads scheduling method by using TimerManager	21.3.1
	The life cycle of TimerManager	21.3.2
	The state transition of TimerManager	21.3.3
	Multiple schedules of TimerManager	21.3.4
Implementation	Developing applications by using TimerManager	21.3.5

With the asynchronous timer processing performed by using TimerManager, you can schedule the asynchronous processing of threads in a Java EE environment by specifying an execution interval. Threads managed by a container are used in the background, and hence you can safely execute tasks.

In TimerListener, you implement the process that performs scheduling. The processing implemented in TimerListener is scheduled by executing the method of TimerManager in EJBs or servlets, which are the schedule sources. You can respond to the schedule or cancel the schedule by using Timer, which is returned from the schedule method of TimerManager.

To use TimerManager, you define the information related to TimerManager in the <resource-ref> tag of an EJB attribute or a servlet attribute. An EJB or a servlet uses TimerManager by performing a lookup with the name defined in the <res-ref-name> tag at the time of deployment.

Organization of this section

• 21.3.1 Methods of scheduling threads by using TimerManager

• 21.3.2 Life cycle of TimerManager

• 21.3.3 State transition of TimerManager

• 21.3.4 Multiple schedules of TimerManager

• 21.3.5 Developing applications by using TimerManager

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