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CICS ACTIVITY - Activity Management

CICS ACTIVITY provides activity management capabilities for programs and transactions. It enables programs to manage activities, process activity data, and handle activity operations in CICS environments.

What is CICS ACTIVITY?

CICS ACTIVITY is a command that allows programs to manage activities in the system. It provides activity management capabilities, activity processing, and activity operations for CICS applications.

Command Syntax

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EXEC CICS ACTIVITY
    [ACTIVITY(activity-name)]
    [ACTION(action-type)]
    [RESP(response-code)]
END-EXEC

Parameters

Optional Parameters

  • ACTIVITY(activity-name) - Name of activity to manage
  • ACTION(action-type) - Type of action to perform
  • RESP(response-code) - Response code variable

Activity Types

Transaction Activities

Transaction activity types

  • • TRANSACTION START - Transaction start activities
  • • TRANSACTION END - Transaction end activities
  • • TRANSACTION PROCESS - Transaction process activities
  • • TRANSACTION MONITOR - Transaction monitor activities

Program Activities

Program activity types

  • • PROGRAM START - Program start activities
  • • PROGRAM END - Program end activities
  • • PROGRAM PROCESS - Program process activities
  • • PROGRAM MONITOR - Program monitor activities

Resource Activities

Resource activity types

  • • RESOURCE ALLOCATE - Resource allocate activities
  • • RESOURCE FREE - Resource free activities
  • • RESOURCE PROCESS - Resource process activities
  • • RESOURCE MONITOR - Resource monitor activities

System Activities

System activity types

  • • SYSTEM START - System start activities
  • • SYSTEM END - System end activities
  • • SYSTEM PROCESS - System process activities
  • • SYSTEM MONITOR - System monitor activities

Programming Examples

Basic Activity Management

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. ACTIVITY01.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  ACTIVITY-NAME PIC X(8) VALUE 'MYACT001'.
       01  ACTION-TYPE PIC X(8) VALUE 'START'.
       01  RESPONSE-CODE PIC S9(8) COMP.
       
       PROCEDURE DIVISION.
           DISPLAY 'Managing activity'
           DISPLAY 'Activity: ' ACTIVITY-NAME
           DISPLAY 'Action: ' ACTION-TYPE
           
           EXEC CICS ACTIVITY
               ACTIVITY(ACTIVITY-NAME)
               ACTION(ACTION-TYPE)
               RESP(RESPONSE-CODE)
           END-EXEC
           
           IF RESPONSE-CODE = DFHRESP(NORMAL)
               DISPLAY 'Activity managed successfully'
           ELSE
               DISPLAY 'Activity management failed'
           END-IF
           
           EXEC CICS RETURN END-EXEC.

Advanced Activity Processing

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. ACTIVITY02.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  ACTIVITY-NAME PIC X(8).
       01  ACTION-TYPE PIC X(8).
       01  RESPONSE-CODE PIC S9(8) COMP.
       01  ACTIVITY-COUNT PIC S9(2) COMP VALUE 0.
       01  MAX-ACTIVITIES PIC S9(2) COMP VALUE 4.
       01  ACTIVITY-STATUS PIC X(1).
       01  ACTIVITY-LIST.
           05  ACTIVITY-ITEM OCCURS 4 TIMES.
               10  ACTIVITY-ID PIC X(8).
               10  ACTIVITY-ACTION PIC X(8).
               10  ACTIVITY-STATUS PIC X(1).
       
       PROCEDURE DIVISION.
           PERFORM INITIALIZE-ACTIVITIES
           PERFORM MANAGE-MULTIPLE-ACTIVITIES
           
           EXEC CICS RETURN END-EXEC.
       
       INITIALIZE-ACTIVITIES.
           MOVE 'ACT001' TO ACTIVITY-ID(1)
           MOVE 'START' TO ACTIVITY-ACTION(1)
           MOVE 'ACT002' TO ACTIVITY-ID(2)
           MOVE 'PROCESS' TO ACTIVITY-ACTION(2)
           MOVE 'ACT003' TO ACTIVITY-ID(3)
           MOVE 'MONITOR' TO ACTIVITY-ACTION(3)
           MOVE 'ACT004' TO ACTIVITY-ID(4)
           MOVE 'END' TO ACTIVITY-ACTION(4).
       
       MANAGE-MULTIPLE-ACTIVITIES.
           PERFORM VARYING ACTIVITY-COUNT FROM 1 BY 1
               UNTIL ACTIVITY-COUNT > MAX-ACTIVITIES
               
               MOVE ACTIVITY-ID(ACTIVITY-COUNT) TO ACTIVITY-NAME
               MOVE ACTIVITY-ACTION(ACTIVITY-COUNT) TO ACTION-TYPE
               PERFORM MANAGE-SINGLE-ACTIVITY
               
               IF RESPONSE-CODE = DFHRESP(NORMAL)
                   MOVE 'S' TO ACTIVITY-STATUS(ACTIVITY-COUNT)
                   DISPLAY 'Activity ' ACTIVITY-COUNT ' managed successfully'
               ELSE
                   MOVE 'F' TO ACTIVITY-STATUS(ACTIVITY-COUNT)
                   DISPLAY 'Activity ' ACTIVITY-COUNT ' management failed'
               END-IF
           END-PERFORM.
       
       MANAGE-SINGLE-ACTIVITY.
           EXEC CICS ACTIVITY
               ACTIVITY(ACTIVITY-NAME)
               ACTION(ACTION-TYPE)
               RESP(RESPONSE-CODE)
           END-EXEC.

Error Handling with Activity Management

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. ACTIVITY03.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  ACTIVITY-NAME PIC X(8) VALUE 'MYACT001'.
       01  ACTION-TYPE PIC X(8) VALUE 'START'.
       01  RESPONSE-CODE PIC S9(8) COMP.
       01  RETRY-COUNT PIC S9(2) COMP VALUE 0.
       01  MAX-RETRIES PIC S9(2) COMP VALUE 3.
       01  ACTIVITY-MANAGE-SUCCESSFUL PIC X(1) VALUE 'N'.
       
       PROCEDURE DIVISION.
           PERFORM MANAGE-ACTIVITY-WITH-RETRY
           
           EXEC CICS RETURN END-EXEC.
       
       MANAGE-ACTIVITY-WITH-RETRY.
           PERFORM MANAGE-ACTIVITY
           
           IF RESPONSE-CODE NOT = DFHRESP(NORMAL)
               AND RETRY-COUNT < MAX-RETRIES
               ADD 1 TO RETRY-COUNT
               DISPLAY 'Retry ' RETRY-COUNT ' activity management operation'
               PERFORM MANAGE-ACTIVITY-WITH-RETRY
           END-IF.
       
       MANAGE-ACTIVITY.
           EXEC CICS ACTIVITY
               ACTIVITY(ACTIVITY-NAME)
               ACTION(ACTION-TYPE)
               RESP(RESPONSE-CODE)
           END-EXEC
           
           EVALUATE RESPONSE-CODE
               WHEN DFHRESP(NORMAL)
                   MOVE 'Y' TO ACTIVITY-MANAGE-SUCCESSFUL
                   DISPLAY 'Activity management operation successful'
               WHEN DFHRESP(NOTAUTH)
                   DISPLAY 'Not authorized to manage activity'
               WHEN DFHRESP(INVREQ)
                   DISPLAY 'Invalid activity management request'
               WHEN DFHRESP(ACTIVITYERR)
                   DISPLAY 'Activity management error'
               WHEN DFHRESP(ACTIVITYNOTFOUND)
                   DISPLAY 'Activity not found'
               WHEN DFHRESP(ACTIVITYINUSE)
                   DISPLAY 'Activity is in use'
               WHEN OTHER
                   DISPLAY 'Unexpected activity management error'
           END-EVALUATE.

Activity Management

Activity Operations

  • • Activity Start - Start activities
  • • Activity End - End activities
  • • Activity Process - Process activities
  • • Activity Monitor - Monitor activities

Activity Lifecycle

  • • Activity Creation - Create activities
  • • Activity Processing - Process activities
  • • Activity Completion - Complete activities
  • • Activity Cleanup - Clean up activities

Activity Monitoring

  • • Activity Tracking - Track activity usage
  • • Activity Auditing - Audit activity operations
  • • Activity Reporting - Report activity status
  • • Activity Analysis - Analyze activity patterns

Activity Error Recovery

  • • Activity Error Detection - Detect activity errors
  • • Activity Error Recovery - Recover from activity errors
  • • Activity Retry Mechanisms - Implement activity retry logic
  • • Activity Fallback Procedures - Use activity fallback procedures

Error Handling

Common Response Codes

  • DFHRESP(NORMAL) - Activity management operation successful
  • DFHRESP(NOTAUTH) - Not authorized to manage activity
  • DFHRESP(INVREQ) - Invalid activity management request
  • DFHRESP(ACTIVITYERR) - Activity management error
  • DFHRESP(ACTIVITYNOTFOUND) - Activity not found
  • DFHRESP(ACTIVITYINUSE) - Activity is in use

Performance Considerations

Activity Efficiency

  • • Optimize activity operations - Use efficient activity handling
  • • Minimize activity overhead - Reduce activity processing overhead
  • • Use activity pooling - Implement activity pooling
  • • Monitor activity frequency - Track activity management patterns

System Impact

  • • Monitor system impact - Track how activity management affects the system
  • • Optimize activity handling - Ensure efficient activity processing
  • • Manage activity usage - Monitor activity consumption
  • • Track performance metrics - Monitor activity handling performance

Best Practices

Activity Management Best Practices

  • • Manage activities only when activities are needed
  • • Implement proper error handling for activity operations
  • • Validate activity state before management
  • • Use appropriate activity management techniques
  • • Monitor activity management activities and performance
  • • Maintain activity management audit trails
  • • Handle activity management errors gracefully

Explain It Like I'm 5 Years Old

Think of CICS ACTIVITY like managing a playground:

  • • Playground: "You see a playground" - Activity available
  • • Start Playing: "Start playing on the playground" - Start activity
  • • Play: "Play on the playground" - Process activity
  • • Stop Playing: "Stop playing on the playground" - End activity
  • • Done: "You are done with the playground" - Activity finished

Exercises

Exercise 1: Basic Activity Management

Create a program that manages basic activities.

Exercise 2: Advanced Activity Processing

Write a program that processes multiple activity management operations.

Exercise 3: Error Handling

Implement comprehensive error handling for activity management failures.

Related Concepts

Activity Management

Managing system activities

Activity Processing

Processing activities

Activity Monitoring

Monitoring activities

Activity Lifecycle

Managing activity lifecycle

Error Handling

Managing activity errors