Publish / Subscribe support in IBM Websphere MQ for z/VSE 3.0
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I am not sure, if you are aware of the IBM WebSphere MQ for z/VSE 3.0 functionality introduced with APAR PM73453: "PROVIDE PUBLISH/SUBSCRIBE SUPPORT" some time ago. In between it is described in WebSphere MQ for z/VSE Version 3.0.0 System Management Guide. The latest book is here.
Publish / subscribe messaging allows you to decouple the provider of information, from the consumers of that information. The sending application and receiving application do not need to know anything about each other for the information to be sent and received.
Security: The publish / subscribe function required the introduction of the new resource class MXTOPIC for the Basic Security Manager (BSM) or any External Security Manager (ESM).
You can find a service summary for WebSphere MQ for z/VSE 3.0 here