20345723 Triggering From Console

8/8/2019 20345723 Triggering From Console

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Triggering From Console

Triggering:

The queue manager defines certain conditions as constituting “trigger events”.If triggering is enabled for a queue and a trigger event occurs, the queuemanager sends a trigger message to a queue called an initiation queue. The

presence of the trigger message on the initiation queue indicates that atrigger event has occurred.

The following diagram will describe the process of the triggering.

1. Program A issues an MQPUT and puts a message into A-Q for Program B.



2. The queue manager processes this API call and puts the message into theapplication queue.

3. It also finds out that the queue is triggered. It creates a trigger messageand looks in the Process Definition to find the name of the application and puts it in the trigger message. The trigger message is put into theinitiation queue.

4. The trigger monitor gets the trigger message from the initiation queue andstarts the program specified.

5. The application program starts running and issues an MQGET to retrievethe message from the application queue.

Process definition:

A process definition object defines an application that starts in response to atrigger event on a Web Sphere MQ queue manager.

Initiation queue:

Defining an initiation queue when a trigger event occurs, the queue manager puts a trigger message on the initiation queue specified in the applicationqueue definition. Initiation queues have no special settings .

To do this task, we’ve to create a Queue Manager and two localqueues and a process definition.



First, Create a Queue Manager from the console.The command for Create a Queue Manager is “crtmqmq (Queue Manager

Name)

After creating the Queue Manager, we’ve to start. The command to start theQueue Manager is “strmqm (Queue Manager Name)



Type “runmqsc (Queue Manager Name) to do the Manipulations inside theQueue Manager Objects.

Now create Local Queues in Queue Manager.To create a Local Queue type, “DEFINE QLOCAL (Queue Name)







To set the Trigger Type Property for the Local queue, type “ ALTER QLOCAL (Queue Name) TRIGTYPE(Every or First or None)

To set the Trigger “ON”, Type “ALTER QLOCAL (Queue Name)TRIGGER.



To set the Initiation Queue, type “ALTER QLOCAL (Queue Name) INITQ(Queue Name).

And at last to set the Process name property, type “ ALTER QLOCAL(Queue Name) PROCESS (Process Name).



Use the runmqtrm command to invoke a trigger monitor.Type “runmqtrm –q Initiation Queue Name –m Queue Manager Name.

Now it’ll wait for a trigger message.

To put the message in the Local Queue, type “ amqsput Queue Name QueueManager Name.Type the Message and press Enter.



Now the Trigger will invoke the Process.And the batch file will be executed.Here we specified in the batch file is to run a “Notepad” Application.We can run any application (java) in this batch file.



So the “Notepad” will open when the queue depth is increased.

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20345723 Triggering From Console