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Defining an application queue for triggering

 

An application queue is a local queue that is used by applications for messaging, through the MQI. Triggering requires a number of queue attributes to be defined on the application queue. Triggering itself is enabled by the Trigger attribute (TRIGGER in MQSC commands).

In this example, a trigger event is to be generated when there are 100 messages of priority 5 or greater on the local queue MOTOR.INSURANCE.QUEUE, as follows:

DEFINE QLOCAL (MOTOR.INSURANCE.QUEUE) +
       PROCESS (MOTOR.INSURANCE.QUOTE.PROCESS) +
       MAXMSGL (2000) +
       DEFPSIST (YES) +
       INITQ (MOTOR.INS.INIT.QUEUE) +
       TRIGGER +
       TRIGTYPE (DEPTH) +
       TRIGDPTH (100)+
       TRIGMPRI (5)

where:

QLOCAL (MOTOR.INSURANCE.QUEUE)

Is the name of the application queue being defined.

PROCESS (MOTOR.INSURANCE.QUOTE.PROCESS)

Is the name of the process definition that defines the application to be started by a trigger monitor program.

MAXMSGL (2000)

Is the maximum length of messages on the queue.

DEFPSIST (YES)

Specifies that messages on this queue are persistent by default.

INITQ (MOTOR.INS.INIT.QUEUE)

Is the name of the initiation queue on which the queue manager is to put the trigger message.

TRIGGER

Is the trigger attribute value.

TRIGTYPE (DEPTH)

Specifies that a trigger event is generated when the number of messages of the required priority (TRIGMPRI) reaches the number specified in TRIGDPTH.

TRIGDPTH (100)

Is the number of messages required to generate a trigger event.

TRIGMPRI (5)

Is the priority of messages that are to be counted by the queue manager in deciding whether to generate a trigger event. Only messages with priority 5 or higher are counted.

 

Parent topic:

Managing objects for triggering

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