How the example works

An explanation of the example and how the queue manager uses the reply-to queue alias.

In this example, requester applications at QM1 always use 'Answer_alias' as the reply-to queue in the relevant field of the put call. They always retrieve their messages from the queue named 'Answer'.

The reply-to queue alias definitions are available for use by the QM1 system administrator to change the name of the reply-to queue 'Answer', and of the return route 'QM1_relief'.

Change the queue name 'Answer' is normally not useful because the QM1 applications are expecting their answers in this queue. However, the QM1 system administrator is able to change the return route (class of service), as necessary.

How the queue manager uses the reply-to queue alias

Queue manager QM1 retrieves the definitions from the reply-to queue alias when the reply-to queue name, included in the put call by the application, is the same as the reply-to queue alias, and the queue manager part is blank.

The queue manager replaces the reply-to queue name in the put call with the queue name from the definition. It replaces the blank queue manager name in the put call with the queue manager name from the definition.

These names are carried with the message in the message descriptor.

Table 1. Reply-to queue alias

Field name	Put call	Transmission header
Reply-to queue name	Answer_alias	Answer
Reply-to queue manager name	(blank)	QM1_relief