[MQueue] IBM WMQ Publish.Subscribe

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. IBM WebSphere MQ v6.0
. Chapter 3.3 - IBM WebSphere Publish / Subscribe
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====== MQ Publish / Subscribe (Topic) ======
※ MQ Messages are the vehicle (傳播媒介) used to transport the information between publishers and subscribers. The subject of that information is called a topic.

※ There is a requirement for a middleman to handle the proper routing of information. This is handled by a broker.

※ Topics that are related can be grouped into streams; allowing for fewer total items that the broker needs to manage. It also makes access control simpler. If topic does not belong to a particular stream, the broker has a default stream.

※ Broker configuration can become very complex with many brokers in a network. However - only one broker is allowed per Queue Manager.


====== Setting Up the Broker ======
※ Queues for each broker automatically defined when broker starts if they do not exist :
　- SYSTEM.BROKER.CONTROL.QUEUE
　- SYSTEM.BROKER.DEFAULT.STREAM
　- SYSTEM.BROKER.ADMIN.STREAM
　- SYSTEM.BROKER.MODEL.STREAM
　- SYSTEM.BROKER... (Created by the broker for internal use.)

※ Authorize applications to use these Queues.

※ Update configuration information in qm.ini or broker page of Queue Manager properties in MQ Explorer.


====== Controlling the Broker ======
1. To start a Broker : # strmqbrk (Can be Triggered)
2. To stop a Broker : # endmqbrk
3. To display a Broker : # dspmqbrk
4. To delete a Broker : # dltmqbrk (Broker must be stopped an MQ must active)
5. To clear a Broker : # clrmqbrk
6. To migrate a Broker : # migmqbrk


====== Message Broker Exits ======
※ Allow customization of publications at broker.
　- Can ALTER publication and MQMD

※ Configured in qm.ini or broker page of Queue Manager properties in MQ Explorer.

※ Sample exit provided
　- Changes destination Queue or Queue Manager.