Distribution lists
Not supported on WebSphere MQ for z/OS.
Distribution lists allow you to put a message to multiple destinations in a single MQPUT or MQPUT1 call. Multiple queues can be opened using a single MQOPEN and a message can then be put to each of those queues using a single MQPUT. Some generic information from the MQI structures used for this process can be superseded by specific information relating to the individual destinations included in the distribution list.
When an MQOPEN call is issued, generic information is taken from the Object Descriptor (MQOD). If you specify MQOD_VERSION_2 in the Vfield and a value greater than zero in the RecsPresent field, the Hobj can be defined as a handle of a list (of one or more queues) rather than of a queue. In this case, specific information is given through the object records (MQORs), which give details of destination (that is, ObjectName and ObjectQMgrName).
The object handle (Hobj) is passed to the MQPUT call, allowing you to put to a list rather than to a single queue.
When a message is put on the queues (MQPUT), generic information is taken from the Put Message Option structure (MQPMO) and the Message Descriptor (MQMD). Specific information is given in the form of Put Message Records (MQPMRs).
Response Records (MQRR) can receive a completion code and reason code specific to each destination queue.
Figure 1 shows how distribution lists work.
Figure 1. How distribution lists work. This diagram shows that one message is transmitted through the channel and can be put on more than one remote queue.
Parent topic:
Putting messages on a queue