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Sending messages to a distribution list

 

In WebSphere MQ on all platforms except z/OS, an application can send a message to several destinations with a single MQPUT call. This applies in both a distributed-queuing environment and a clustering environment. You have to define the destinations in a distribution list, as described in the WebSphere MQ Application Programming Guide.

Not all queue managers support distribution lists. When an MCA establishes a connection with a partner, it determines whether or not the partner supports distribution lists and sets a flag on the transmission queue accordingly. If an application tries to send a message that is destined for a distribution list but the partner does not support distribution lists, the sending MCA intercepts the message and puts it onto the transmission queue once for each intended destination.

A receiving MCA ensures that messages sent to a distribution list are safely received at all the intended destinations. If any destinations fail, the MCA establishes which ones have failed so that it can generate exception reports for them and can try to re-send the messages to them.

 

Parent topic:

WebSphere MQ distributed-messaging techniques

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