Passing identity context

 

In general, programs should pass identity context information from message to message around an application until the data reaches its final destination. Programs should change the origin context information each time that they change the data. However, applications that want to change or set any context information must have the appropriate level of authority. The queue manager checks this authority when the applications open the queues; they must have authority to use the appropriate context options for the MQOPEN call.

If your application gets a message, processes the data from the message, then puts the changed data into another message (possibly for processing by another application), the application must pass the identity context information from the original message to the new message. We can allow the queue manager to create the origin context information.

To save the context information from the original message, use the MQOO_SAVE_ALL_CONTEXT option when you open the queue for getting the message. This is in addition to any other options you use with the MQOPEN call. Note, however, that you cannot save context information if you only browse the message.

When you create the second message:

• Open the queue using the MQOO_PASS_IDENTITY_CONTEXT option (in addition to the MQOO_OUTPUT option).

• In the Context field of the put-message options structure, give the handle of the queue from which you saved the context information.

• In the Options field of the put-message options structure, specify the MQPMO_PASS_IDENTITY_CONTEXT option.

 

Parent topic:

Controlling context information

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