Diverting message flows to another destination
Figure 1. Diverting message streams to another destination
Figure 1 illustrates how we can redefine the destination of certain messages. Incoming messages to QMA are destined for ‘QB at QMC’. They would normally arrive at QMA and be placed on a transmission queue called QMC which would have been part of a channel to QMC. QMA must divert the messages to QMD, but is able to reach QMD only over QMB. This method is useful when we need to move a service from one location to another, and allow subscribers to continue to send messages on a temporary basis until they have adjusted to the new address.
The method of rerouting incoming messages destined for a certain queue manager to a different queue manager uses:
- A queue manager alias to change the destination queue manager to another queue manager, and to select a transmission queue to the adjacent system
- A transmission queue to serve the adjacent queue manager
- A transmission queue at the adjacent queue manager for onward routing to the destination queue manager
You must provide:
- Channel_back definition
- Queue manager alias object definition QMC with QB at QMD via QMB
- Channel_out definition
- The associated transmission queue QMB
The complementary administrator who is configuring QMB must provide:
- The corresponding channel_back definition
- The transmission queue, QMD
- The associated channel definition to QMD
We can use aliases within a clustering environment. For information about this, see the WebSphere MQ Queue Manager Clusters book.
Parent topic:
WebSphere MQ distributed-messaging techniques
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