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A method is described which provides a common Return Code Look-Up Facility coupled with a Return Code - Action table providing a consistent handling of bad return codes in an efficient fashion.
English (United States)
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Return Code Look-up Facility
A method is described which provides a common Return Code Look-Up
Facility coupled with a Return Code - Action table providing a consistent handling
of bad return codes in an efficient fashion.
The Return Code Look-Up Facility was developed for a Data Link Control for
a Communication Subsystem.
When one component within the system uses another, the return codes may
require a number of different actions to be performed. This logic to determine the
appropriate action should be done once in a Return Code Look-Up Facility. Using
a table of Return Code - Action pairs, each module will provide the return code to
the Look-Up Facility and receive an action back. That way all modules within the
component take the same action for a particular return code and the logic to
process an action is fewer instructions (since all the return codes can be grouped
into 4 or 5 actions).
The Return Code - Action table is constructed so as to not require all return
codes to be specified. By and large, most return codes fit into a particular Action,
so if there is no match on return code found, that is the action returned (i.e., the
most common action). Thus, all of the return codes mapping into the most
common action may be omitted.