Invoking the distributed routing program on the target region

The route selection, notification, route selection error, and routing complete invocations of the distributed routing program all occur on the routing region. If you want the routing program to be re-invoked on the target region, set the DYROPTER field in the communications area to 'Y'. You must do this on the program's initial (route selection or notification) invocation—and again, if it is reinvoked for a route selection error.

If the routing program sets DYROPTER to 'Y', it is re-invoked on the target region:

When the transaction associated with the routed request is about to be initiated on the target region
If the transaction terminates successfully
If the transaction abends.

Each time it is invoked on the target region, the routing program could update a count of transactions that are currently running on that region. When it is invoked for routing, the routing program could use the counts maintained by all the regions in the routing set (including itself) as input to its routing decision. This requires that each region in the routing set has access to a common data set on which the counts are recorded.