Managing queue name translations

When you create a queue manager alias definition or a remote queue definition, the name resolution is carried out for every message carrying that name. This situation must be managed.

This description is provided for application designers and channel planners concerned with an individual system that has message channels to adjacent systems. It takes a local view of channel planning and control.

When you create a queue manager alias definition or a remote queue definition, the name resolution is carried out for every message carrying that name, regardless of the source of the message. To oversee this situation, which might involve large numbers of queues in a queue manager network, you keep tables of:

• The names of source queues and of source queue managers with respect to resolved queue names, resolved queue manager names, and resolved transmission queue names, with method of resolution
• The names of source queues with respect to:
  • Resolved destination queue names
  • Resolved destination queue manager names
  • Transmission queues
  • Message channel names
  • Adjacent system names
  • Reply-to queue names

Note: The use of the term source in this context refers to the queue name or the queue manager name provided by the application, or a channel program when opening a queue for putting messages.

An example of each of these tables is shown in Table 1, Table 2, and Table 3.

The names in these tables are derived from the examples in this section, and this table is not intended as a practical example of queue name resolution in one node.

Table 1. Queue name resolution at queue manager QMA

Source queue specified when queue is opened	Source queue manager specified when queue is opened	Resolved queue name	Resolved queue manager name	Resolved transmission queue name	Resolution type
QA_norm	-	QA_norm	QMB	QMB	Remote queue
(any)	QMB	-	-	QMB	(none)
QA_norm	-	QA_norm	QMB	TX1	Remote queue
QB	QMC	QB	QMD	QMB	Queue manager alias

Table 2. Queue name resolution at queue manager QMB

Source queue specified when queue is opened	Source queue manager specified when queue is opened	Resolved queue name	Resolved queue manager name	Resolved transmission queue name	Resolution type
QA_norm	-	QA_norm	QMB	-	(none)
QA_norm	QMB	QA_norm	QMB	-	(none)
QA_norm	QMB_PRIORITY	QA_norm	QMB	-	Queue manager alias
(any)	QMC	(any)	QMC	QMC	(none)
(any)	QMD_norm	(any)	QMD_norm	TX1	Queue manager alias
(any)	QMD_PRIORITY	(any)	QMD_PRIORITY	QMD_fast	Queue manager alias
(any)	QMC_small	(any)	QMC_small	TX_small	Queue manager alias
(any)	QMC_large	(any)	QMC_large	TX_external	Queue manager alias
QB_small	QMC	QB_small	QMC	TX_small	Remote queue
QB_large	QMC	QB_large	QMC	TX_large	Remote queue
(any)	QME	(any)	QME	TX1	Queue manager alias
QA	QMC	QA	QMC	TX1	Remote queue
QB	QMD	QB	QMD	TX1	Remote queue

Table 3. Reply-to queue name translation at queue manager QMA

Application design		Reply-to alias definition
Local QMGR	Queue name for messages	Reply-to queue alias name	Redefined to
QMA	QRR	QR	QRR at QMA_class1