EZACIC25 module

This module is a normal CICS® application program which is invoked by an EXEC CICS LINK command. The COMMAREA passes information between the invoking CICS program and the DNS Module. If domain name resolves successfully, EZACIC25 obtains storage from CICS and builds a hostent structure in that storage. When finished with the hostent structure, release this storage using the EXEC CICS FREEMAIN command.

The EZACIC25 module uses four configuration parameters plus the information passed by the invoking application to manage the cache. These configuration parameters are as follows:

Error destination - ERRORTD: The Transient Data destination to which error messages are sent.
Minimum refresh time - CACHMIN: The minimum time in minutes between refreshes of a cache record. If a cache record is younger than this time, it is used. This value is set to 15 minutes.
Maximum refresh time - CACHMAX: The maximum time in minutes between refreshes of a cache record. If a cache record is older than this time, it is refreshed. This value is set to 30 minutes.
Maximum resolver requests - CACHRES: The maximum number of concurrent requests to the resolver. It is set at 10. See How the DNS cache handles requests.

If the transaction program is executing in the Open Transaction Environment, expect a TCB switch to occur for each call to EZACIC25.