Accessing queues and processes

 

To access queues and processes, use the MQQueueManager class. The MQOD (object descriptor structure) is collapsed into the parameters of these methods. For example, to open a queue on a queue manager called queueManager, use the following code:

MQQueue queue = queueManager.accessQueue("qName",
                                         MQC.MQOO_OUTPUT,
                                         "qMgrName",
                                         "dynamicQName",
                                         "altUserId");

The options parameter is the same as the Options parameter in the MQOPEN call.

The accessQueue method returns a new object of class MQQueue.

When you have finished using the queue, use the close() method to close it, as in the following example:

queue.close();

With WebSphere MQ classes for Java, we can also create a queue by using the MQQueue constructor. The parameters are exactly the same as for the accessQueue method, with the addition of a queue manager parameter. For example:

MQQueue queue = new MQQueue(queueManager,
                            "qName",
                            MQC.MQOO_OUTPUT,
                            "qMgrName",
                            "dynamicQName",
                            "altUserId");

Constructing a queue object in this way enables you to write your own subclasses of MQQueue.

To access a process, use the accessProcess method in place of accessQueue. This method does not have a dynamic queue name parameter, because this does not apply to processes.

The accessProcess method returns a new object of class MQProcess.

When you have finished using the process object, use the close() method to close it, as in the following example:

process.close();

With WebSphere MQ classes for Java, we can also create a process by using the MQProcess constructor. The parameters are exactly the same as for the accessProcess method, with the addition of a queue manager parameter. Constructing a process object in this way enables you to write your own subclasses of MQProcess.

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