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   Programming a BEA Tuxedo Application Using COBOL

Because the communication details are handled by the BEA Tuxedo system controlling program, you can concentrate on the application service logic rather than communication implementation. For compatibility with the system-supplied controlling program, however, application services must adhere to certain conventions. These conventions are referred to, collectively, as the service template for coding service routines. They are summarized in the following list.

• A request/response service can receive only one request at a time and can send only one reply.

• When processing a request, a request/response service works only on that request. It can accept another only after it has either sent a reply to the requester or forwarded the request to another service for additional processing.

• Service routines must terminate by calling either the TPRETURN or TPFORWAR routine.

• When communicating with another server via TPACALL, the initiating service must either wait for all outstanding replies or invalidate them with TPCANCEL before calling TPRETURN or TPFORWAR .