What is CICS GDS RECEIVE command used for?

CICS GDS RECEIVE is used to receive data from GDS processes in the system, providing GDS data reception capabilities and GDS message handling for CICS applications.

What types of GDS data can be received?

GDS data types include GDS message types (data, control, status, error messages), GDS data formats (text, binary, structured, XML data), GDS communication types (conversation, session, connection, channel data), and GDS process data (process, buffer, queue, event data).

How do I handle errors with CICS GDS RECEIVE?

Always check the response code and implement appropriate error handling, including validation of GDS data, retry mechanisms for failed operations, and fallback procedures for GDS data reception errors.

What is the purpose of GDS data reception?

GDS data reception enables GDS data receive, GDS message handling, GDS data validation, GDS data processing, GDS data lifecycle management, GDS data monitoring, and GDS error recovery in CICS applications.

When should I use CICS GDS RECEIVE?

Use this command when you need to receive GDS data, handle GDS messages, process GDS data, or implement GDS data reception in CICS applications.

CICS GDS RECEIVE - GDS Data Reception

CICS GDS RECEIVE provides GDS data reception capabilities for programs and transactions. It enables programs to receive GDS data, handle GDS messages, and process GDS data in CICS environments.

What is CICS GDS RECEIVE?

CICS GDS RECEIVE is a command that allows programs to receive data from GDS processes in the system. It provides GDS data reception capabilities, GDS message handling, and GDS data processing for CICS applications.

Command Syntax

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EXEC CICS GDS RECEIVE
    [INTO(data-area)]
    [LENGTH(data-length)]
    [CONVID(conversation-id)]
    [RESP(response-code)]
END-EXEC

Parameters

Optional Parameters

INTO(data-area) - Data area to receive data
LENGTH(data-length) - Length of data area
CONVID(conversation-id) - Conversation ID variable
RESP(response-code) - Response code variable

GDS Data Types

GDS Message Types

GDS message data types

• GDS DATA MESSAGE - GDS data messages
• GDS CONTROL MESSAGE - GDS control messages
• GDS STATUS MESSAGE - GDS status messages
• GDS ERROR MESSAGE - GDS error messages

GDS Data Formats

GDS data format types

• GDS TEXT DATA - GDS text data
• GDS BINARY DATA - GDS binary data
• GDS STRUCTURED DATA - GDS structured data
• GDS XML DATA - GDS XML data

GDS Communication Types

GDS communication data types

• GDS CONVERSATION DATA - GDS conversation data
• GDS SESSION DATA - GDS session data
• GDS CONNECTION DATA - GDS connection data
• GDS CHANNEL DATA - GDS channel data

GDS Process Data

GDS process data types

• GDS PROCESS DATA - GDS process data
• GDS BUFFER DATA - GDS buffer data
• GDS QUEUE DATA - GDS queue data
• GDS EVENT DATA - GDS event data

Programming Examples

Basic GDS Data Reception

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. GDSRECV01.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  DATA-AREA PIC X(100).
       01  DATA-LENGTH PIC S9(4) COMP VALUE 100.
       01  CONVERSATION-ID PIC S9(8) COMP.
       01  RESPONSE-CODE PIC S9(8) COMP.
       
       PROCEDURE DIVISION.
           DISPLAY 'Receiving GDS data'
           
           EXEC CICS GDS RECEIVE
               INTO(DATA-AREA)
               LENGTH(DATA-LENGTH)
               CONVID(CONVERSATION-ID)
               RESP(RESPONSE-CODE)
           END-EXEC
           
           IF RESPONSE-CODE = DFHRESP(NORMAL)
               DISPLAY 'GDS data received successfully'
               DISPLAY 'Data: ' DATA-AREA
               DISPLAY 'Length: ' DATA-LENGTH
           ELSE
               DISPLAY 'GDS data receive failed'
           END-IF
           
           EXEC CICS RETURN END-EXEC.

Advanced GDS Message Handling

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. GDSRECV02.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  DATA-AREA PIC X(100).
       01  DATA-LENGTH PIC S9(4) COMP VALUE 100.
       01  CONVERSATION-ID PIC S9(8) COMP.
       01  RESPONSE-CODE PIC S9(8) COMP.
       01  RECEIVE-COUNT PIC S9(2) COMP VALUE 0.
       01  MAX-RECEIVES PIC S9(2) COMP VALUE 3.
       01  GDS-STATUS PIC X(1).
       01  MESSAGE-LIST.
           05  MESSAGE-ITEM OCCURS 3 TIMES.
               10  MESSAGE-ID PIC X(8).
               10  MESSAGE-TYPE PIC X(8).
               10  MESSAGE-STATUS PIC X(1).
       
       PROCEDURE DIVISION.
           PERFORM INITIALIZE-GDS-MESSAGES
           PERFORM RECEIVE-MULTIPLE-GDS-MESSAGES
           
           EXEC CICS RETURN END-EXEC.
       
       INITIALIZE-GDS-MESSAGES.
           MOVE 'MSG001' TO MESSAGE-ID(1)
           MOVE 'DATA' TO MESSAGE-TYPE(1)
           MOVE 'MSG002' TO MESSAGE-ID(2)
           MOVE 'CONTROL' TO MESSAGE-TYPE(2)
           MOVE 'MSG003' TO MESSAGE-ID(3)
           MOVE 'STATUS' TO MESSAGE-TYPE(3).
       
       RECEIVE-MULTIPLE-GDS-MESSAGES.
           PERFORM VARYING RECEIVE-COUNT FROM 1 BY 1
               UNTIL RECEIVE-COUNT > MAX-RECEIVES
               
               PERFORM RECEIVE-SINGLE-GDS-MESSAGE
               
               IF RESPONSE-CODE = DFHRESP(NORMAL)
                   MOVE 'R' TO MESSAGE-STATUS(RECEIVE-COUNT)
                   DISPLAY 'GDS message ' RECEIVE-COUNT ' received successfully'
               ELSE
                   MOVE 'F' TO MESSAGE-STATUS(RECEIVE-COUNT)
                   DISPLAY 'GDS message ' RECEIVE-COUNT ' receive failed'
               END-IF
           END-PERFORM.
       
       RECEIVE-SINGLE-GDS-MESSAGE.
           EXEC CICS GDS RECEIVE
               INTO(DATA-AREA)
               LENGTH(DATA-LENGTH)
               CONVID(CONVERSATION-ID)
               RESP(RESPONSE-CODE)
           END-EXEC.

Error Handling with GDS Data Reception

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. GDSRECV03.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  DATA-AREA PIC X(100).
       01  DATA-LENGTH PIC S9(4) COMP VALUE 100.
       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-RECEIVE-SUCCESSFUL PIC X(1) VALUE 'N'.
       
       PROCEDURE DIVISION.
           PERFORM RECEIVE-GDS-DATA-WITH-RETRY
           
           EXEC CICS RETURN END-EXEC.
       
       RECEIVE-GDS-DATA-WITH-RETRY.
           PERFORM RECEIVE-GDS-DATA
           
           IF RESPONSE-CODE NOT = DFHRESP(NORMAL)
               AND RETRY-COUNT < MAX-RETRIES
               ADD 1 TO RETRY-COUNT
               DISPLAY 'Retry ' RETRY-COUNT ' GDS data receive operation'
               PERFORM RECEIVE-GDS-DATA-WITH-RETRY
           END-IF.
       
       RECEIVE-GDS-DATA.
           EXEC CICS GDS RECEIVE
               INTO(DATA-AREA)
               LENGTH(DATA-LENGTH)
               CONVID(CONVERSATION-ID)
               RESP(RESPONSE-CODE)
           END-EXEC
           
           EVALUATE RESPONSE-CODE
               WHEN DFHRESP(NORMAL)
                   MOVE 'Y' TO GDS-RECEIVE-SUCCESSFUL
                   DISPLAY 'GDS data receive operation successful'
               WHEN DFHRESP(NOTAUTH)
                   DISPLAY 'Not authorized to receive GDS data'
               WHEN DFHRESP(INVREQ)
                   DISPLAY 'Invalid GDS data receive request'
               WHEN DFHRESP(RECEIVEERR)
                   DISPLAY 'GDS data receive operation error'
               WHEN DFHRESP(NODATA)
                   DISPLAY 'No GDS data available'
               WHEN DFHRESP(DATAERR)
                   DISPLAY 'GDS data error'
               WHEN OTHER
                   DISPLAY 'Unexpected GDS data receive error'
           END-EVALUATE.

GDS Data Processing

GDS Data Reception

• GDS Data Receive - Receive GDS data
• GDS Message Handling - Handle GDS messages
• GDS Data Validation - Validate GDS data
• GDS Data Processing - Process GDS data

GDS Data Lifecycle

• GDS Data Transmission - Transmit GDS data
• GDS Data Reception - Receive GDS data
• GDS Data Processing - Process GDS data
• GDS Data Storage - Store GDS data

GDS Data Monitoring

• GDS Data Tracking - Track GDS data flow
• GDS Data Auditing - Audit GDS data operations
• GDS Data Reporting - Report GDS data status
• GDS Data Analysis - Analyze GDS data patterns

GDS Error Recovery

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

Error Handling

Common Response Codes

DFHRESP(NORMAL) - GDS data receive operation successful
DFHRESP(NOTAUTH) - Not authorized to receive GDS data
DFHRESP(INVREQ) - Invalid GDS data receive request
DFHRESP(RECEIVEERR) - GDS data receive operation error
DFHRESP(NODATA) - No GDS data available
DFHRESP(DATAERR) - GDS data error

Performance Considerations

GDS Data Efficiency

• Optimize GDS data operations - Use efficient GDS data handling
• Minimize GDS data overhead - Reduce GDS data processing overhead
• Use GDS data buffering - Implement GDS data buffering
• Monitor GDS data frequency - Track GDS data receive patterns

System Impact

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

Best Practices

GDS Data Reception Best Practices

• Receive GDS data only when needed
• Implement proper error handling for GDS data operations
• Validate GDS data before processing
• Use appropriate GDS data management techniques
• Monitor GDS data reception activities and performance
• Maintain GDS data reception audit trails
• Handle GDS data reception errors gracefully

Explain It Like I'm 5 Years Old

Think of CICS GDS RECEIVE like getting mail:

• Check Mailbox: "Check your mailbox for mail" - Check for GDS data
• Get Mail: "Get the mail from your mailbox" - Receive GDS data
• Read Mail: "Read the mail you got" - Process GDS data
• Use Information: "Use the information from the mail" - Use GDS data
• Keep Mail: "Keep the mail safe" - Store GDS data

Exercises

Exercise 1: Basic GDS Data Reception

Create a program that receives basic GDS data.

Exercise 2: Advanced GDS Message Handling

Write a program that manages multiple GDS message receptions.

Exercise 3: Error Handling

Implement comprehensive error handling for GDS data reception failures.

CICS GDS RECEIVE - GDS Data Reception

What is CICS GDS RECEIVE?

Command Syntax

Parameters

Optional Parameters

GDS Data Types

GDS Message Types

GDS Data Formats

GDS Communication Types

GDS Process Data

Programming Examples

Basic GDS Data Reception

Advanced GDS Message Handling

Error Handling with GDS Data Reception

GDS Data Processing

GDS Data Reception

GDS Data Lifecycle

GDS Data Monitoring

GDS Error Recovery

Error Handling

Common Response Codes

Performance Considerations

GDS Data Efficiency

System Impact

Best Practices

GDS Data Reception Best Practices

Explain It Like I'm 5 Years Old

Exercises

Exercise 1: Basic GDS Data Reception

Exercise 2: Advanced GDS Message Handling

Exercise 3: Error Handling

Related Concepts

GDS Data Processing

GDS Data Reception

GDS Message Handling

GDS Data Validation

Error Handling

Related Pages