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CICS GETNEXT ACTIVITY - Activity Browsing

CICS GETNEXT ACTIVITY provides activity browsing capabilities for programs and transactions. It enables programs to browse activities, iterate through activity lists, and handle activity browsing operations in CICS environments.

What is CICS GETNEXT ACTIVITY?

CICS GETNEXT ACTIVITY is a command that allows programs to browse activities in sequence, retrieve the next activity in a browse operation, and iterate through activity lists. It provides activity browsing capabilities, activity iteration, and activity list handling for CICS applications.

Command Syntax

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EXEC CICS GETNEXT ACTIVITY
    INTO(data-area)
    LENGTH(data-length)
    [RESP(response-code)]
END-EXEC

Parameters

Required Parameters

  • INTO(data-area) - Data area to receive activity information
  • LENGTH(data-length) - Length of data area

Optional Parameters

  • RESP(response-code) - Response code variable

Activity Types

Business Activities

Business-related activities

  • • BUSINESS PROCESS - Browse business process activities
  • • TRANSACTION ACTIVITY - Browse transaction activities
  • • WORKFLOW ACTIVITY - Browse workflow activities
  • • APPLICATION ACTIVITY - Browse application activities

System Activities

System-level activities

  • • SYSTEM PROCESS - Browse system process activities
  • • RESOURCE ACTIVITY - Browse resource activities
  • • SESSION ACTIVITY - Browse session activities
  • • MONITORING ACTIVITY - Browse monitoring activities

User Activities

User-related activities

  • • USER SESSION - Browse user session activities
  • • USER ACTION - Browse user action activities
  • • USER INTERACTION - Browse user interaction activities
  • • USER WORKFLOW - Browse user workflow activities

Custom Activities

User-defined activities

  • • CUSTOM PROCESS - Browse custom process activities
  • • CUSTOM WORKFLOW - Browse custom workflow activities
  • • CUSTOM INTEGRATION - Browse custom integration activities
  • • CUSTOM BUSINESS - Browse custom business activities

Programming Examples

Basic Activity Browsing

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. GETNEXTACTIVITY01.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  ACTIVITY-DATA PIC X(100).
       01  DATA-LENGTH PIC S9(8) COMP VALUE 100.
       01  RESPONSE-CODE PIC S9(8) COMP.
       01  ACTIVITY-COUNT PIC S9(4) COMP VALUE 0.
       01  MAX-ACTIVITIES PIC S9(4) COMP VALUE 10.
       01  BROWSE-ACTIVE PIC X(1) VALUE 'Y'.
       
       PROCEDURE DIVISION.
           PERFORM START-ACTIVITY-BROWSE
           
           PERFORM UNTIL BROWSE-ACTIVE = 'N'
               OR ACTIVITY-COUNT >= MAX-ACTIVITIES
               
               EXEC CICS GETNEXT ACTIVITY
                   INTO(ACTIVITY-DATA)
                   LENGTH(DATA-LENGTH)
                   RESP(RESPONSE-CODE)
               END-EXEC
               
               IF RESPONSE-CODE = DFHRESP(NORMAL)
                   ADD 1 TO ACTIVITY-COUNT
                   DISPLAY 'Activity ' ACTIVITY-COUNT ': ' ACTIVITY-DATA(1:DATA-LENGTH)
               ELSE
                   MOVE 'N' TO BROWSE-ACTIVE
                   DISPLAY 'End of activities or error occurred'
               END-IF
           END-PERFORM
           
           EXEC CICS ENDBROWSE ACTIVITY END-EXEC
           EXEC CICS RETURN END-EXEC.

Advanced Activity Management

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. GETNEXTACTIVITY02.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  ACTIVITY-DATA PIC X(200).
       01  DATA-LENGTH PIC S9(8) COMP VALUE 200.
       01  RESPONSE-CODE PIC S9(8) COMP.
       01  ACTIVITY-COUNT PIC S9(4) COMP VALUE 0.
       01  MAX-ACTIVITIES PIC S9(4) COMP VALUE 20.
       01  BROWSE-ACTIVE PIC X(1) VALUE 'Y'.
       01  ACTIVITY-LIST.
           05  ACTIVITY-ITEM OCCURS 20 TIMES.
               10  ACTIVITY-ID PIC X(8).
               10  ACTIVITY-STATUS PIC X(1).
       
       PROCEDURE DIVISION.
           PERFORM START-ACTIVITY-BROWSE
           PERFORM BROWSE-ACTIVITIES
           PERFORM END-ACTIVITY-BROWSE
           
           EXEC CICS RETURN END-EXEC.
       
       START-ACTIVITY-BROWSE.
           EXEC CICS STARTBROWSE ACTIVITY END-EXEC.
       
       BROWSE-ACTIVITIES.
           PERFORM UNTIL BROWSE-ACTIVE = 'N'
               OR ACTIVITY-COUNT >= MAX-ACTIVITIES
               
               EXEC CICS GETNEXT ACTIVITY
                   INTO(ACTIVITY-DATA)
                   LENGTH(DATA-LENGTH)
                   RESP(RESPONSE-CODE)
               END-EXEC
               
               IF RESPONSE-CODE = DFHRESP(NORMAL)
                   ADD 1 TO ACTIVITY-COUNT
                   MOVE ACTIVITY-DATA(1:8) TO ACTIVITY-ID(ACTIVITY-COUNT)
                   MOVE 'A' TO ACTIVITY-STATUS(ACTIVITY-COUNT)
                   DISPLAY 'Retrieved activity: ' ACTIVITY-ID(ACTIVITY-COUNT)
               ELSE
                   MOVE 'N' TO BROWSE-ACTIVE
                   DISPLAY 'End of activities or error occurred'
               END-IF
           END-PERFORM.
       
       END-ACTIVITY-BROWSE.
           EXEC CICS ENDBROWSE ACTIVITY END-EXEC.

Error Handling with Activity Browsing

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. GETNEXTACTIVITY03.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  ACTIVITY-DATA PIC X(100).
       01  DATA-LENGTH PIC S9(8) COMP VALUE 100.
       01  RESPONSE-CODE PIC S9(8) COMP.
       01  ACTIVITY-COUNT PIC S9(4) COMP VALUE 0.
       01  MAX-ACTIVITIES PIC S9(4) COMP VALUE 15.
       01  BROWSE-ACTIVE PIC X(1) VALUE 'Y'.
       01  RETRY-COUNT PIC S9(2) COMP VALUE 0.
       01  MAX-RETRIES PIC S9(2) COMP VALUE 3.
       
       PROCEDURE DIVISION.
           PERFORM START-ACTIVITY-BROWSE
           PERFORM BROWSE-ACTIVITIES-WITH-ERROR-HANDLING
           PERFORM END-ACTIVITY-BROWSE
           
           EXEC CICS RETURN END-EXEC.
       
       START-ACTIVITY-BROWSE.
           EXEC CICS STARTBROWSE ACTIVITY END-EXEC.
       
       BROWSE-ACTIVITIES-WITH-ERROR-HANDLING.
           PERFORM UNTIL BROWSE-ACTIVE = 'N'
               OR ACTIVITY-COUNT >= MAX-ACTIVITIES
               
               PERFORM GET-NEXT-ACTIVITY
               
               IF RESPONSE-CODE = DFHRESP(NORMAL)
                   ADD 1 TO ACTIVITY-COUNT
                   DISPLAY 'Activity ' ACTIVITY-COUNT ': ' ACTIVITY-DATA(1:DATA-LENGTH)
               ELSE
                   PERFORM HANDLE-BROWSE-ERROR
               END-IF
           END-PERFORM.
       
       GET-NEXT-ACTIVITY.
           EXEC CICS GETNEXT ACTIVITY
               INTO(ACTIVITY-DATA)
               LENGTH(DATA-LENGTH)
               RESP(RESPONSE-CODE)
           END-EXEC.
       
       HANDLE-BROWSE-ERROR.
           EVALUATE RESPONSE-CODE
               WHEN DFHRESP(ENDFILE)
                   MOVE 'N' TO BROWSE-ACTIVE
                   DISPLAY 'End of activities reached'
               WHEN DFHRESP(NOTAUTH)
                   DISPLAY 'Not authorized to browse activities'
                   MOVE 'N' TO BROWSE-ACTIVE
               WHEN DFHRESP(INVREQ)
                   DISPLAY 'Invalid browse request'
                   MOVE 'N' TO BROWSE-ACTIVE
               WHEN DFHRESP(ACTIVITYERR)
                   DISPLAY 'Activity browse error'
                   MOVE 'N' TO BROWSE-ACTIVE
               WHEN OTHER
                   DISPLAY 'Unexpected error occurred'
                   MOVE 'N' TO BROWSE-ACTIVE
           END-EVALUATE.
       
       END-ACTIVITY-BROWSE.
           EXEC CICS ENDBROWSE ACTIVITY END-EXEC.

Activity Management

Activity Browsing

  • • Activity Iteration - Iterate through activities
  • • Activity Filtering - Filter activity results
  • • Activity Sorting - Sort activity results
  • • Activity Pagination - Paginate activity results

Activity Monitoring

  • • Activity Tracking - Track activity progress
  • • Activity Logging - Log activity information
  • • Activity Auditing - Audit activity operations
  • • Activity Reporting - Generate activity reports

Activity Lifecycle

  • • Activity Creation - Create new activities
  • • Activity Initialization - Initialize activities
  • • Activity Processing - Process activities
  • • Activity Cleanup - Clean up activity resources

Error Recovery

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

Error Handling

Common Response Codes

  • DFHRESP(NORMAL) - Activity retrieved successfully
  • DFHRESP(ENDFILE) - End of activities reached
  • DFHRESP(NOTAUTH) - Not authorized to browse activities
  • DFHRESP(INVREQ) - Invalid browse request
  • DFHRESP(ACTIVITYERR) - Activity browse error
  • DFHRESP(ACTIVITYMANAGEMENTERR) - Activity management error

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 occurrence patterns

System Impact

  • • Monitor system impact - Track how activities affect 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 Browsing Best Practices

  • • Always start and end browse operations properly
  • • Implement proper error handling for activity operations
  • • Validate activity requests before processing
  • • Use appropriate activity browsing methods
  • • Monitor activity browsing activities and performance
  • • Maintain activity audit trails
  • • Handle activity errors gracefully

Explain It Like I'm 5 Years Old

Think of CICS GETNEXT ACTIVITY like reading a book:

  • • Open Book: "Open the book to start reading" - Start browse
  • • Read Page: "Read the next page" - Get next activity
  • • Keep Reading: "Keep reading page by page" - Continue browsing
  • • End of Book: "You reach the end of the book" - End of activities
  • • Close Book: "Close the book when done" - End browse

Exercises

Exercise 1: Basic Activity Browsing

Create a program that browses through activities using GETNEXT ACTIVITY.

Exercise 2: Advanced Activity Management

Write a program that manages activity browsing with filtering and sorting.

Exercise 3: Error Handling

Implement comprehensive error handling for activity browsing failures.

Related Concepts

Activity Management

Managing system activities

Activity Browsing

Browsing activity information

Activity Monitoring

Monitoring activity progress

Activity Operations

Activity system operations

Error Handling

Managing activity errors