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Responses

 

In response to each command, the command server generates one or more response messages. A response message has a similar format to a command message; the PCF header has the same command identifier value as the command to which it is a response (see MQCFH - PCF header for details). The message identifier and correlation identifier are set according to the report options of the request.

If the PCF header type of the command message is MQCFT_COMMAND, standard responses only are generated. Such commands are supported on all platforms except z/OS. Older applications will not support PCF on z/OS; the WebSphere MQ Windows Explorer is one such application (however, the V6.0 WebSphere MQ Explorer does support PCF on z/OS).

If the PCF header type of the command message is MQCFT_COMMAND_XR, either extended or standard responses are generated. Such commands are supported on z/OS and some other platforms. Commands issued on z/OS generate only extended responses. On other platforms, either type of response may be generated.

If a single command specifies a generic object name, a separate response is returned in its own message for each matching object. For the purpose of response generation, a single command with a generic name is treated as multiple individual commands (except for the control field MQCFC_LAST or MQCFC_NOT_LAST). Otherwise, one command message generates one response message.

Certain PCF responses might return a structure even when it is not requested. This is shown in the definition of the response (Definitions of the Programmable Command Formats) as always returned. The reason that, for these responses, it is necessary to name the objects in the response to identify which object the data applies.

• Message descriptor for a response
  

 

Parent topic:

Using Programmable Command Formats

pc10410_

 

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