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When the distributed routing program is invoked
For non-terminal-related START requests that are eligible for enhanced routing,
CICS invokes the distributed routing program at the following points:
On the requesting region:
1. Either of the following:
v For routing the request.
v For notification of a statically-routed request. This occurs when a
transaction defined as ROUTABLE(YES) is eligible for
enhanced
routing
but not for
dynamic
routing because one or both of the following applies:
– The transaction definition specifies DYNAMIC(NO).
– The SYSID option of the START command names a remote region
explicitly.
The routing program is not able to route the request. It could, however,
do other things.
2. If an error occurs in route selection—for example, if the target region
returned by the routing program on the route selection call is unavailable.
This gives the routing program the opportunity to specify an alternate target.
This process iterates until the routing program selects a target that is
available or sets a non-zero return code.
3. After CICS has tried (successfully or unsuccessfully) to route the request to
the target region.
This invocation signals that (unless the requesting region and the target
region are one and the same) the requesting region’s responsibility for this
transaction has been discharged. The routing program might, for example,
use this invocation to release any resources that it has acquired on behalf
of the transaction.
On the target region:
These invocations occur only if the target region is CICS TS Release 3 or later
and the routing program on the requesting region has specified that it should be
reinvoked on the target region
:
1. When the transaction associated with the request starts on the target
region.
2. If the transaction ends successfully.
3. If the transaction abends.
Figure 47 on page 583 shows the points at which the distributed routing program is
invoked, and the region on which each invocation occurs. Note that the “target
region” is not necessarily remote—it could be the local (requesting) region, if the
routing program chooses to execute the START request locally.
routing of non-terminal-related STARTs
582
CICS TS for OS/390: CICS Customization Guide
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