CA IDMS VSAM Transparency Architecture › CA IDMS VSAM Transparency Architecture— CICS Processing

CA IDMS VSAM Transparency Architecture— CICS Processing

The following diagram illustrates the CA IDMS VSAM Transparency components used for CICS processing.

CICS Uses Additional Components

CICS CA IDMS VSAM Transparency processing uses all of the request processing routines described above, except for the batch interface routine. CICS CA IDMS VSAM Transparency processing also uses these additional components:

• The CA IDMS VSAM Transparency CICS interface communicates directly with the front-end communication manager routine. Each CICS transaction uses its own CA IDMS VSAM Transparency run unit for efficient multithreaded processing, task-level journaling, and recovery.
• The CA IDMS CICS interface (IDMSINTC) establishes communication between the CA IDMS VSAM Transparency front end and back end. Requests are transmitted to the back end; data and status code information are returned to the front end. IDMSINTC must be assembled with CA IDMS VSAM Transparency parameters.
• The transaction name table maps the transaction names of CICS applications to CA IDMS/DB subschema names. This table is discussed later in this appendix under Control Tables.

CICS Interface Points

At runtime, CA IDMS VSAM Transparency interfaces with CICS at the following points:

• Open/Close—When IDMSINTC is started, the opens are processed and then CA IDMS VSAM Transparency writes error messages showing the feedback code.
• Transaction start initialization—Transaction start is handled by the CA IDMS VSAM Transparency CICS interface. This interface:
  • Uniquely identifies the transaction before passing control to CA IDMS VSAM Transparency
  • Initializes the CA IDMS VSAM Transparency environment for the transaction at the first VSAM request
  • Enables each CICS transaction to run as a separate CA IDMS/DB run unit
  • Takes the place of the front-end batch interface routine. The CA IDMS VSAM Transparency CICS interface:
    • Saves the user environment
    • Sets up the CA IDMS VSAM Transparency environment for the individual transactions
    • Calls the front-end communication manager routine
• Transaction end—IDMSINTC contains code that checks for normal or abnormal termination of transactions.

  More information:

  For more information on the IDMSINTC macro and its parameters, refer to CA IDMS installation guide for your operating system