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CICS GETNEXT PROCESS - Process Browse Navigation

CICS GETNEXT PROCESS provides process browse navigation capabilities in CICS environments. It enables programs to navigate process browse operations, retrieve next processes, and manage process browsing sessions in CICS applications.

What is CICS GETNEXT PROCESS?

CICS GETNEXT PROCESS is a command that allows programs to navigate process browse operations, retrieve next processes, and manage process browsing sessions in CICS environments. It provides process browse navigation capabilities, sequential access, and browse management for CICS applications.

Command Syntax

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EXEC CICS GETNEXT PROCESS
    [REQID(request-id)]
    [PROCESSID(process-id)]
    [INTO(data-area)]
    [LENGTH(data-length)]
    [RESP(response-code)]
END-EXEC

Parameters

Optional Parameters

  • REQID - Request identifier for the browse operation
  • PROCESSID - Process identifier to receive next process
  • INTO - Data area to receive process information
  • LENGTH - Length of data to retrieve
  • RESP - Response code variable

Process Browse Navigation Types

Sequential Navigation

Navigate through processes in sequence

  • • FORWARD NAVIGATION - Navigate forward through process list
  • • NEXT PROCESS NAVIGATION - Move to next process in sequence
  • • SEQUENTIAL ACCESS - Access processes in sequential order
  • • LINEAR NAVIGATION - Navigate linearly through processes

Process Type Navigation

Navigate through processes by type

  • • TYPE-SPECIFIC NAVIGATION - Navigate through processes of specific types
  • • MULTI-TYPE NAVIGATION - Navigate across multiple process types
  • • TYPE-GROUP NAVIGATION - Navigate through process type groups
  • • TYPE-PATTERN NAVIGATION - Navigate through processes matching type patterns

Conditional Navigation

Navigate based on specific conditions

  • • CONDITIONAL NAVIGATION - Navigate only when conditions are met
  • • STATE-BASED NAVIGATION - Navigate based on process state
  • • PRIORITY-BASED NAVIGATION - Navigate based on process priority
  • • FILTERED NAVIGATION - Navigate through filtered processes

Batch Navigation

Navigate through multiple processes

  • • BATCH NAVIGATION - Navigate through multiple processes in batch
  • • GROUP NAVIGATION - Navigate through related process groups
  • • CATEGORY NAVIGATION - Navigate through process categories
  • • PATTERN NAVIGATION - Navigate through processes matching patterns

Programming Examples

Basic Process Navigation

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. GETNEXT01.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  REQUEST-ID      PIC X(8) VALUE 'REQ001'.
       01  PROCESS-ID      PIC X(8).
       01  DATA-AREA       PIC X(1000).
       01  DATA-LENGTH     PIC S9(8) COMP.
       01  RESPONSE-CODE   PIC S9(8) COMP.
       
       PROCEDURE DIVISION.
           EXEC CICS GETNEXT PROCESS
               REQID(REQUEST-ID)
               PROCESSID(PROCESS-ID)
               INTO(DATA-AREA)
               LENGTH(DATA-LENGTH)
               RESP(RESPONSE-CODE)
           END-EXEC
           
           IF RESPONSE-CODE = DFHRESP(NORMAL)
               DISPLAY 'Next process retrieved successfully'
               DISPLAY 'Process ID: ' PROCESS-ID
               DISPLAY 'Data length: ' DATA-LENGTH
           ELSE
               DISPLAY 'Failed to retrieve next process'
           END-IF
           
           EXEC CICS RETURN END-EXEC.

Process Navigation Loop

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. GETNEXT02.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  REQUEST-ID      PIC X(8) VALUE 'REQ002'.
       01  PROCESS-ID      PIC X(8).
       01  DATA-AREA       PIC X(1000).
       01  DATA-LENGTH     PIC S9(8) COMP.
       01  RESPONSE-CODE   PIC S9(8) COMP.
       01  PROCESS-COUNT   PIC 9(3) VALUE 0.
       
       PROCEDURE DIVISION.
           PERFORM UNTIL RESPONSE-CODE NOT = DFHRESP(NORMAL)
               EXEC CICS GETNEXT PROCESS
                   REQID(REQUEST-ID)
                   PROCESSID(PROCESS-ID)
                   INTO(DATA-AREA)
                   LENGTH(DATA-LENGTH)
                   RESP(RESPONSE-CODE)
               END-EXEC
               
               IF RESPONSE-CODE = DFHRESP(NORMAL)
                   ADD 1 TO PROCESS-COUNT
                   DISPLAY 'Process ' PROCESS-COUNT ': ' PROCESS-ID
               END-IF
           END-PERFORM
           
           DISPLAY 'Total processes processed: ' PROCESS-COUNT
           
           EXEC CICS RETURN END-EXEC.

Error Handling with Process Navigation

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. GETNEXT03.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  REQUEST-ID      PIC X(8) VALUE 'REQ003'.
       01  PROCESS-ID      PIC X(8).
       01  DATA-AREA       PIC X(1000).
       01  DATA-LENGTH     PIC S9(8) COMP.
       01  RESPONSE-CODE   PIC S9(8) COMP.
       
       PROCEDURE DIVISION.
           EXEC CICS GETNEXT PROCESS
               REQID(REQUEST-ID)
               PROCESSID(PROCESS-ID)
               INTO(DATA-AREA)
               LENGTH(DATA-LENGTH)
               RESP(RESPONSE-CODE)
           END-EXEC
           
           EVALUATE RESPONSE-CODE
               WHEN DFHRESP(NORMAL)
                   DISPLAY 'Next process retrieved successfully'
                   DISPLAY 'Process ID: ' PROCESS-ID
               WHEN DFHRESP(ENDFILE)
                   DISPLAY 'End of process list reached'
               WHEN DFHRESP(NOTFND)
                   DISPLAY 'Browse operation not found'
               WHEN DFHRESP(INVREQ)
                   DISPLAY 'Invalid navigation request'
               WHEN DFHRESP(PROCESSERR)
                   DISPLAY 'Process-specific error occurred'
               WHEN OTHER
                   DISPLAY 'Unexpected error occurred'
           END-EVALUATE
           
           EXEC CICS RETURN END-EXEC.

Process Browse Management

Browse State Management

  • • Browse Position Tracking - Track current position in browse operation
  • • Browse State Maintenance - Maintain browse state across operations
  • • Browse Context Management - Manage browse context and environment
  • • Browse Session Management - Manage browse session lifecycle

Process Management

  • • Process Data Management - Manage process data during navigation
  • • Process State Management - Manage process state during navigation
  • • Process Metadata Management - Manage process metadata during navigation
  • • Process Access Management - Manage process access during navigation

Handler Management

  • • Handler Registration - Register process handlers during navigation
  • • Handler Execution - Execute process handlers during navigation
  • • Handler Cleanup - Clean up process handlers after navigation
  • • Handler Monitoring - Monitor process handler performance

Error Management

  • • Error Detection - Detect errors during navigation
  • • Error Recovery - Recover from navigation errors
  • • Error Reporting - Report navigation errors
  • • Error Prevention - Prevent future navigation errors

Error Handling

Common Response Codes

  • DFHRESP(NORMAL) - Next process retrieved successfully
  • DFHRESP(ENDFILE) - End of process list reached
  • DFHRESP(NOTFND) - Browse operation not found
  • DFHRESP(INVREQ) - Invalid navigation request
  • DFHRESP(PROCESSERR) - Process-specific error
  • DFHRESP(GETNEXTERR) - Get next-specific error

Performance Considerations

Navigation Efficiency

  • • Optimize navigation operations - Use appropriate navigation methods for different process types
  • • Minimize navigation overhead - Reduce the computational cost of navigation operations
  • • Use efficient navigation patterns - Implement navigation strategies that minimize resource usage
  • • Monitor navigation performance - Track the performance impact of navigation operations

Resource Impact

  • • Monitor resource usage - Track how navigation operations consume system resources
  • • Optimize resource allocation - Ensure efficient allocation of resources for navigation
  • • Manage resource cleanup - Properly clean up resources after navigation operations
  • • Track resource utilization - Monitor the overall resource consumption patterns

Best Practices

Process Browse Navigation Best Practices

  • • Always check response codes
  • • Use appropriate navigation parameters
  • • Implement proper error handling
  • • Ensure proper browse state management
  • • Validate navigation operations
  • • Optimize navigation operations
  • • Clean up resources properly

Explain It Like I'm 5 Years Old

Think of CICS GETNEXT PROCESS like looking through a list of workers:

  • • List Name: "Which list of workers to look through" - The request ID
  • • Look at Next Worker: "Look at the next worker" - Get next process
  • • See What They Do: "See what the worker does" - Access process data
  • • Keep Looking: "Look at more workers" - Continue navigation
  • • All Done: "Finished looking through all workers" - End of processes

Exercises

Exercise 1: Basic Process Navigation

Create a program that navigates through processes using GETNEXT PROCESS.

Exercise 2: Process Navigation Loop

Write a program that loops through all processes using GETNEXT PROCESS.

Exercise 3: Error Handling

Implement comprehensive error handling for process navigation failures and end-of-list conditions.

Related Concepts

Process Management

Managing system processes

Browse Operations

Managing browse operations

Process Handlers

Managing process handlers

Process Processing

Processing system processes

Error Handling

Managing navigation errors