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CICS HANDLE CONDITION - Condition Handling

CICS HANDLE CONDITION provides condition handling capabilities in CICS environments. It enables programs to handle conditions, manage error conditions, and handle condition processing for robust error handling and recovery purposes.

Command Syntax

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       EXEC CICS HANDLE CONDITION
            [CONDITION(condition-name)]
            [LABEL(exit-label)]
            [RESP(response-code)]
            [RESP2(response-code-2)]
       END-EXEC.

Parameters

CONDITION(condition-name)

Specifies the name of the condition to be handled. This parameter identifies the specific condition for handling operations.

LABEL(exit-label)

Specifies the label to which control should be transferred when the condition occurs. This parameter provides the exit point for condition handling.

RESP(response-code)

Specifies the response code variable to receive the operation result. This parameter provides error handling and status information.

RESP2(response-code-2)

Specifies the secondary response code variable for additional error information. This parameter provides extended error details when available.

Condition Types

Error Conditions

HANDLE CONDITION manages error conditions such as file errors, data errors, and system errors for robust error handling and recovery.

End-of-File Conditions

The command supports end-of-file conditions for handling file processing completion and data end conditions.

Data Conditions

Data conditions handle data validation errors, format errors, and data processing exceptions for data integrity.

System Conditions

System conditions handle system-level errors, resource limitations, and operational exceptions for system stability.

Programming Examples

Basic Condition Handling

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       WORKING-STORAGE SECTION.
       01  CONDITION-NAME    PIC X(16) VALUE 'ERROR'.
       01  EXIT-LABEL        PIC X(16) VALUE 'ERROR-EXIT'.
       01  RESPONSE-CODE     PIC S9(8) COMP.
       01  RESPONSE-CODE-2   PIC S9(8) COMP.
 
       PROCEDURE DIVISION.
           EXEC CICS HANDLE CONDITION
                CONDITION(CONDITION-NAME)
                LABEL(EXIT-LABEL)
                RESP(RESPONSE-CODE)
                RESP2(RESPONSE-CODE-2)
           END-EXEC
           
           IF RESPONSE-CODE = 0
               DISPLAY 'Condition handler set successfully'
               DISPLAY 'Condition: ' CONDITION-NAME
               DISPLAY 'Exit label: ' EXIT-LABEL
           ELSE
               DISPLAY 'Error setting condition handler: ' RESPONSE-CODE
           END-IF.
           
       ERROR-EXIT.
           DISPLAY 'Error condition occurred - handling error'
           PERFORM ERROR-RECOVERY
           EXEC CICS RETURN END-EXEC.

Multiple Condition Handling

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       WORKING-STORAGE SECTION.
       01  CONDITION-NAME    PIC X(16).
       01  EXIT-LABEL        PIC X(16).
       01  RESPONSE-CODE     PIC S9(8) COMP.
       01  RESPONSE-CODE-2   PIC S9(8) COMP.
       01  HANDLER-COUNT     PIC S9(8) COMP VALUE 0.
 
       PROCEDURE DIVISION.
           PERFORM SET-FILE-ERROR-HANDLER
           PERFORM SET-DATA-ERROR-HANDLER
           PERFORM SET-SYSTEM-ERROR-HANDLER.
           
       SET-FILE-ERROR-HANDLER.
           MOVE 'FILE-ERROR' TO CONDITION-NAME
           MOVE 'FILE-ERROR-EXIT' TO EXIT-LABEL
           EXEC CICS HANDLE CONDITION
                CONDITION(CONDITION-NAME)
                LABEL(EXIT-LABEL)
                RESP(RESPONSE-CODE)
                RESP2(RESPONSE-CODE-2)
           END-EXEC
           IF RESPONSE-CODE = 0
               ADD 1 TO HANDLER-COUNT
               DISPLAY 'File error handler set'
           END-IF.
           
       SET-DATA-ERROR-HANDLER.
           MOVE 'DATA-ERROR' TO CONDITION-NAME
           MOVE 'DATA-ERROR-EXIT' TO EXIT-LABEL
           EXEC CICS HANDLE CONDITION
                CONDITION(CONDITION-NAME)
                LABEL(EXIT-LABEL)
                RESP(RESPONSE-CODE)
                RESP2(RESPONSE-CODE-2)
           END-EXEC
           IF RESPONSE-CODE = 0
               ADD 1 TO HANDLER-COUNT
               DISPLAY 'Data error handler set'
           END-IF.
           
       SET-SYSTEM-ERROR-HANDLER.
           MOVE 'SYSTEM-ERROR' TO CONDITION-NAME
           MOVE 'SYSTEM-ERROR-EXIT' TO EXIT-LABEL
           EXEC CICS HANDLE CONDITION
                CONDITION(CONDITION-NAME)
                LABEL(EXIT-LABEL)
                RESP(RESPONSE-CODE)
                RESP2(RESPONSE-CODE-2)
           END-EXEC
           IF RESPONSE-CODE = 0
               ADD 1 TO HANDLER-COUNT
               DISPLAY 'System error handler set'
           END-IF.
           
       FILE-ERROR-EXIT.
           DISPLAY 'File error occurred - handling file error'
           PERFORM FILE-ERROR-RECOVERY.
           
       DATA-ERROR-EXIT.
           DISPLAY 'Data error occurred - handling data error'
           PERFORM DATA-ERROR-RECOVERY.
           
       SYSTEM-ERROR-EXIT.
           DISPLAY 'System error occurred - handling system error'
           PERFORM SYSTEM-ERROR-RECOVERY.

Dynamic Condition Handling

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       WORKING-STORAGE SECTION.
       01  CONDITION-NAME    PIC X(16).
       01  EXIT-LABEL        PIC X(16).
       01  RESPONSE-CODE     PIC S9(8) COMP.
       01  RESPONSE-CODE-2   PIC S9(8) COMP.
       01  PROCESSING-COUNT  PIC S9(8) COMP VALUE 0.
 
       PROCEDURE DIVISION.
           PERFORM VARYING PROCESSING-COUNT FROM 1 BY 1
           UNTIL PROCESSING-COUNT > 3
               PERFORM BUILD-CONDITION-NAME
               PERFORM BUILD-EXIT-LABEL
               PERFORM SET-CONDITION-HANDLER
           END-PERFORM.
           
       BUILD-CONDITION-NAME.
           EVALUATE PROCESSING-COUNT
               WHEN 1
                   MOVE 'EOF' TO CONDITION-NAME
               WHEN 2
                   MOVE 'INVREQ' TO CONDITION-NAME
               WHEN 3
                   MOVE 'NOTFND' TO CONDITION-NAME
           END-EVALUATE.
           
       BUILD-EXIT-LABEL.
           EVALUATE PROCESSING-COUNT
               WHEN 1
                   MOVE 'EOF-EXIT' TO EXIT-LABEL
               WHEN 2
                   MOVE 'INVREQ-EXIT' TO EXIT-LABEL
               WHEN 3
                   MOVE 'NOTFND-EXIT' TO EXIT-LABEL
           END-EVALUATE.
           
       SET-CONDITION-HANDLER.
           EXEC CICS HANDLE CONDITION
                CONDITION(CONDITION-NAME)
                LABEL(EXIT-LABEL)
                RESP(RESPONSE-CODE)
                RESP2(RESPONSE-CODE-2)
           END-EXEC
           
           IF RESPONSE-CODE = 0
               DISPLAY 'Condition handler set for ' CONDITION-NAME
           ELSE
               DISPLAY 'Error setting handler for ' CONDITION-NAME ': ' RESPONSE-CODE
           END-IF.
           
       EOF-EXIT.
           DISPLAY 'End of file condition occurred'
           PERFORM EOF-RECOVERY.
           
       INVREQ-EXIT.
           DISPLAY 'Invalid request condition occurred'
           PERFORM INVREQ-RECOVERY.
           
       NOTFND-EXIT.
           DISPLAY 'Not found condition occurred'
           PERFORM NOTFND-RECOVERY.

Error Handling

Response Code 0

Successful condition handler setup. The condition handler has been successfully established and is ready for use.

Response Code 8

Invalid condition name. The specified condition name is invalid or not supported.

Response Code 12

Invalid exit label. The specified exit label is invalid or not found in the program.

Response Code 16

Handler setup failed. The condition handler setup operation failed due to system conditions.

Response Code 20

Handler not available. The condition handler is not available in the current execution context.

Performance Considerations

Handler Efficiency

HANDLE CONDITION efficiently manages condition handlers, but excessive handlers may impact system performance.

Handler Management

Proper handler management ensures efficient condition processing and prevents handler conflicts and resource issues.

Recovery Processing

Recovery processing should be optimized to minimize impact on normal program execution and system performance.

Best Practices

Error Handling

Always check response codes and handle errors appropriately, especially for condition validation and handler setup.

Condition Management

Implement proper condition management strategies to ensure effective error handling and recovery procedures.

Recovery Procedures

Design effective recovery procedures that can handle various error conditions and restore program execution.

Handler Optimization

Optimize condition handlers by using appropriate conditions and implementing efficient recovery logic.

Explain It Like I's 5 Years Old

Imagine you're playing a game and you want to be ready if something goes wrong. CICS HANDLE CONDITION is like having a plan for what to do if something bad happens in your game.

The condition name is like the name of the problem (like "falling down"), and the exit label is like telling the game where to go if that problem happens (like "go to the hospital").

Just like you need to have a plan for different problems, the program needs to have a plan for different kinds of errors that might happen.

Exercises

Exercise 1: Basic Condition Handling

Write a program that uses HANDLE CONDITION to set up error handling for a specific condition and implement recovery procedures.

Exercise 2: Multiple Condition Management

Create a program that handles multiple types of conditions (file errors, data errors, system errors) with appropriate recovery procedures.

Exercise 3: Dynamic Error Handling

Implement a dynamic error handling system that sets up condition handlers based on program requirements and business logic.

Related Concepts

CICS Error Handling

Understanding CICS error handling and recovery procedures

CICS Condition Management

Learning about CICS condition management and processing

CICS Program Control

Understanding CICS program control and flow management

CICS Recovery Procedures

Learning about CICS recovery procedures and error recovery