openUTM offers service-controlled queues, that is, message queues the processing of which is controlled by the program units of the application. A program unit of a dialog or asynchronous service must read the message of a service-controlled queue itself using the KDCS call DGET. A service may also be designed to wait for the arrival of a message.
Since the messages are saved in the page pool, you must ensure that the page pool is configured at a sufficient size.
openUTM provides three different service-controlled queue types:
USER queues (user-specific)
TAC queues (defined using TAC statements)
temporary queues (created using QCRE calls and deleted using QREL calls)
 | A general introduction to service-controlled queues and their application scenarios can be found in the openUTM manual “Concepts und Functions”. The implementation of the application scenarios is described in the openUTM manual „Programming Applications with KDCS”. This also contains information about processing service-controlled queues (reading, writing and deleting). |