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CICS GDS CONNECT PROCESS - GDS Process Connection

CICS GDS CONNECT PROCESS provides GDS process connection capabilities for programs and transactions. It enables programs to connect to GDS processes, manage GDS process communication, and handle GDS process operations in CICS environments.

What is CICS GDS CONNECT PROCESS?

CICS GDS CONNECT PROCESS is a command that allows programs to connect to GDS processes in the system. It provides GDS process connection capabilities, GDS process communication, and GDS process management for CICS applications.

Command Syntax

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EXEC CICS GDS CONNECT PROCESS
    PROCESS(process-name)
    [CONVID(conversation-id)]
    [RESP(response-code)]
END-EXEC

Parameters

Required Parameters

  • PROCESS(process-name) - Name of GDS process to connect to

Optional Parameters

  • CONVID(conversation-id) - Conversation ID variable
  • RESP(response-code) - Response code variable

GDS Process Types

GDS Application Processes

GDS application process types

  • • GDS APPLICATION - GDS application processes
  • • GDS SERVICE - GDS service processes
  • • GDS UTILITY - GDS utility processes
  • • GDS SYSTEM - GDS system processes

GDS Communication Processes

GDS communication process types

  • • GDS CONVERSATION - GDS conversation processes
  • • GDS SESSION - GDS session processes
  • • GDS CONNECTION - GDS connection processes
  • • GDS CHANNEL - GDS channel processes

GDS Data Processes

GDS data process types

  • • GDS DATA - GDS data processes
  • • GDS MESSAGE - GDS message processes
  • • GDS BUFFER - GDS buffer processes
  • • GDS QUEUE - GDS queue processes

GDS Control Processes

GDS control process types

  • • GDS CONTROL - GDS control processes
  • • GDS MONITOR - GDS monitor processes
  • • GDS MANAGER - GDS manager processes
  • • GDS HANDLER - GDS handler processes

Programming Examples

Basic GDS Process Connection

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. GDSCONN01.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  PROCESS-NAME PIC X(8) VALUE 'GDSAPP01'.
       01  CONVERSATION-ID PIC S9(8) COMP.
       01  RESPONSE-CODE PIC S9(8) COMP.
       
       PROCEDURE DIVISION.
           DISPLAY 'Connecting to GDS process'
           DISPLAY 'Process: ' PROCESS-NAME
           
           EXEC CICS GDS CONNECT PROCESS
               PROCESS(PROCESS-NAME)
               CONVID(CONVERSATION-ID)
               RESP(RESPONSE-CODE)
           END-EXEC
           
           IF RESPONSE-CODE = DFHRESP(NORMAL)
               DISPLAY 'GDS process connected successfully'
               DISPLAY 'Conversation ID: ' CONVERSATION-ID
           ELSE
               DISPLAY 'GDS process connection failed'
           END-IF
           
           EXEC CICS RETURN END-EXEC.

Advanced GDS Process Management

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. GDSCONN02.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  PROCESS-NAME PIC X(8).
       01  CONVERSATION-ID PIC S9(8) COMP.
       01  RESPONSE-CODE PIC S9(8) COMP.
       01  CONNECT-COUNT PIC S9(2) COMP VALUE 0.
       01  MAX-CONNECTS PIC S9(2) COMP VALUE 3.
       01  GDS-STATUS PIC X(1).
       01  PROCESS-LIST.
           05  PROCESS-ITEM OCCURS 3 TIMES.
               10  PROCESS-ID PIC X(8).
               10  PROCESS-TYPE PIC X(8).
               10  PROCESS-STATUS PIC X(1).
       
       PROCEDURE DIVISION.
           PERFORM INITIALIZE-GDS-PROCESSES
           PERFORM CONNECT-MULTIPLE-GDS-PROCESSES
           
           EXEC CICS RETURN END-EXEC.
       
       INITIALIZE-GDS-PROCESSES.
           MOVE 'GDSAPP01' TO PROCESS-ID(1)
           MOVE 'APPLICATION' TO PROCESS-TYPE(1)
           MOVE 'GDSAPP02' TO PROCESS-ID(2)
           MOVE 'SERVICE' TO PROCESS-TYPE(2)
           MOVE 'GDSAPP03' TO PROCESS-ID(3)
           MOVE 'UTILITY' TO PROCESS-TYPE(3).
       
       CONNECT-MULTIPLE-GDS-PROCESSES.
           PERFORM VARYING CONNECT-COUNT FROM 1 BY 1
               UNTIL CONNECT-COUNT > MAX-CONNECTS
               
               MOVE PROCESS-ID(CONNECT-COUNT) TO PROCESS-NAME
               PERFORM CONNECT-SINGLE-GDS-PROCESS
               
               IF RESPONSE-CODE = DFHRESP(NORMAL)
                   MOVE 'C' TO PROCESS-STATUS(CONNECT-COUNT)
                   DISPLAY 'GDS process ' CONNECT-COUNT ' connected successfully'
               ELSE
                   MOVE 'E' TO PROCESS-STATUS(CONNECT-COUNT)
                   DISPLAY 'GDS process ' CONNECT-COUNT ' connection failed'
               END-IF
           END-PERFORM.
       
       CONNECT-SINGLE-GDS-PROCESS.
           EXEC CICS GDS CONNECT PROCESS
               PROCESS(PROCESS-NAME)
               CONVID(CONVERSATION-ID)
               RESP(RESPONSE-CODE)
           END-EXEC.

Error Handling with GDS Process Connection

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. GDSCONN03.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  PROCESS-NAME PIC X(8) VALUE 'GDSAPP01'.
       01  CONVERSATION-ID PIC S9(8) COMP.
       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  GDS-CONNECT-SUCCESSFUL PIC X(1) VALUE 'N'.
       
       PROCEDURE DIVISION.
           PERFORM CONNECT-GDS-PROCESS-WITH-RETRY
           
           EXEC CICS RETURN END-EXEC.
       
       CONNECT-GDS-PROCESS-WITH-RETRY.
           PERFORM CONNECT-GDS-PROCESS
           
           IF RESPONSE-CODE NOT = DFHRESP(NORMAL)
               AND RETRY-COUNT < MAX-RETRIES
               ADD 1 TO RETRY-COUNT
               DISPLAY 'Retry ' RETRY-COUNT ' GDS process connection'
               PERFORM CONNECT-GDS-PROCESS-WITH-RETRY
           END-IF.
       
       CONNECT-GDS-PROCESS.
           EXEC CICS GDS CONNECT PROCESS
               PROCESS(PROCESS-NAME)
               CONVID(CONVERSATION-ID)
               RESP(RESPONSE-CODE)
           END-EXEC
           
           EVALUATE RESPONSE-CODE
               WHEN DFHRESP(NORMAL)
                   MOVE 'Y' TO GDS-CONNECT-SUCCESSFUL
                   DISPLAY 'GDS process connection successful'
               WHEN DFHRESP(NOTAUTH)
                   DISPLAY 'Not authorized to connect to GDS process'
               WHEN DFHRESP(INVREQ)
                   DISPLAY 'Invalid GDS process connection request'
               WHEN DFHRESP(PROCESSERR)
                   DISPLAY 'GDS process connection error'
               WHEN DFHRESP(PROCESSNOTFOUND)
                   DISPLAY 'GDS process not found'
               WHEN DFHRESP(PROCESSINUSE)
                   DISPLAY 'GDS process is in use'
               WHEN OTHER
                   DISPLAY 'Unexpected GDS process connection error'
           END-EVALUATE.

GDS Process Management

GDS Process Connection

  • • GDS Process Connect - Connect to GDS processes
  • • GDS Process Communication - Communicate with GDS processes
  • • GDS Process Validation - Validate GDS process state
  • • GDS Process Monitoring - Monitor GDS process status

GDS Process Lifecycle

  • • GDS Process Creation - Create GDS processes
  • • GDS Process Connection - Connect to GDS processes
  • • GDS Process Usage - Use GDS processes
  • • GDS Process Cleanup - Clean up GDS processes

GDS Process Monitoring

  • • GDS Process Tracking - Track GDS process usage
  • • GDS Process Auditing - Audit GDS process operations
  • • GDS Process Reporting - Report GDS process status
  • • GDS Process Analysis - Analyze GDS process patterns

GDS Error Recovery

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

Error Handling

Common Response Codes

  • DFHRESP(NORMAL) - GDS process connection successful
  • DFHRESP(NOTAUTH) - Not authorized to connect to GDS process
  • DFHRESP(INVREQ) - Invalid GDS process connection request
  • DFHRESP(PROCESSERR) - GDS process connection error
  • DFHRESP(PROCESSNOTFOUND) - GDS process not found
  • DFHRESP(PROCESSINUSE) - GDS process is in use

Performance Considerations

GDS Process Efficiency

  • • Optimize GDS process operations - Use efficient GDS process handling
  • • Minimize GDS process overhead - Reduce GDS process processing overhead
  • • Use GDS process pooling - Implement GDS process pooling
  • • Monitor GDS process frequency - Track GDS process connection patterns

System Impact

  • • Monitor system impact - Track how GDS process connection affects the system
  • • Optimize GDS process handling - Ensure efficient GDS process processing
  • • Manage GDS process usage - Monitor GDS process consumption
  • • Track performance metrics - Monitor GDS process handling performance

Best Practices

GDS Process Connection Best Practices

  • • Connect to GDS processes only when needed
  • • Implement proper error handling for GDS process operations
  • • Validate GDS process state before connecting
  • • Use appropriate GDS process management techniques
  • • Monitor GDS process connection activities and performance
  • • Maintain GDS process connection audit trails
  • • Handle GDS process connection errors gracefully

Explain It Like I'm 5 Years Old

Think of CICS GDS CONNECT PROCESS like calling your friend:

  • • Want to Talk: "You want to talk to your friend" - Need to connect to GDS process
  • • Call Friend: "Call your friend on the phone" - Connect to GDS process
  • • Friend Answers: "Your friend answers the phone" - GDS process connected
  • • Start Talking: "Start talking to your friend" - Begin GDS process communication
  • • Keep Talking: "Keep talking until done" - Continue GDS process operations

Exercises

Exercise 1: Basic GDS Process Connection

Create a program that connects to a basic GDS process.

Exercise 2: Advanced GDS Process Management

Write a program that manages multiple GDS process connections.

Exercise 3: Error Handling

Implement comprehensive error handling for GDS process connection failures.

Related Concepts

GDS Process Management

Managing GDS system processes

GDS Process Connection

Connecting to GDS processes

GDS Process Monitoring

Monitoring GDS process usage

GDS Process Communication

Communicating with GDS processes

Error Handling

Managing GDS process errors