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CICS WAIT CONVID (APPC) - APPC Wait Conversation ID

CICS WAIT CONVID (APPC) waits for APPC conversation ID events, enabling APPC conversation management and output processing in CICS environments. It provides efficient APPC conversation waiting capabilities for CICS applications.

What is CICS WAIT CONVID (APPC)?

CICS WAIT CONVID (APPC) waits for APPC conversation ID events, enabling APPC conversation management and output processing. It provides efficient APPC conversation waiting capabilities, allowing applications to wait for APPC conversation events.

Command Syntax

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EXEC CICS WAIT CONVID
    CONVID(conversation-id)
    [RESP(response-code)]
    [RESP2(response-code-2)]
END-EXEC.

Parameters Explained

CONVID Parameter

Specifies the conversation ID to wait for:

  • Must be a valid conversation ID
  • Identifies the conversation
  • Required for all WAIT CONVID operations
  • Must be active conversation

RESP Parameters

Response codes returned by the command:

  • RESP: Primary response code
  • RESP2: Secondary response code
  • Always check these codes for command success
  • Handle command failures appropriately

APPC Conversation Types

1. Basic Conversations

  • Basic conversations: Basic APPC conversations
  • Mapped conversations: Mapped APPC conversations
  • Unmapped conversations: Unmapped APPC conversations
  • Custom conversations: Custom APPC conversations

2. Advanced Conversations

  • Advanced conversations: Advanced APPC conversations
  • Secure conversations: Secure APPC conversations
  • Encrypted conversations: Encrypted APPC conversations
  • Compressed conversations: Compressed APPC conversations

3. Specialized Conversations

  • Specialized conversations: Specialized APPC conversations
  • High-performance conversations: High-performance APPC conversations
  • Low-latency conversations: Low-latency APPC conversations
  • High-throughput conversations: High-throughput APPC conversations

Implementation Example

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WORKING-STORAGE SECTION.
01 WS-RESPONSE            PIC S9(8) COMP.
01 WS-RESPONSE2           PIC S9(8) COMP.
01 WS-CONVERSATION-ID     PIC X(8) VALUE 'CONV0001'.
 
PROCEDURE DIVISION.
    * Wait for APPC conversation ID
    EXEC CICS WAIT CONVID
        CONVID(WS-CONVERSATION-ID)
        RESP(WS-RESPONSE)
        RESP2(WS-RESPONSE2)
    END-EXEC.
    
    IF WS-RESPONSE NOT EQUAL DFHRESP(NORMAL)
        EXEC CICS WRITE OPERATOR
            TEXT('WAIT CONVID (APPC) command failed')
        END-EXEC
        EXEC CICS RETURN END-EXEC
    END-IF.
    
    * Conversation event received
    * Continue processing

APPC Conversation Processing

1. Conversation Preparation

Conversation preparation includes:

  • Conversation validation
  • Conversation formatting
  • Conversation encoding
  • Conversation processing

2. Conversation Transmission

Conversation transmission includes:

  • Conversation routing
  • Conversation delivery
  • Transmission confirmation
  • Error handling

3. Output Management

Output management includes:

  • Partner management
  • Output formatting
  • User experience
  • Performance optimization

Common Response Codes

Success Response Codes

  • NORMAL (0): Conversation event received
  • WAIT (4): Conversation waiting

Error Response Codes

  • INVREQ (16): Invalid request
  • NOTFND (20): Conversation not found
  • LENGERR (22): Length error
  • WAIT (24): Wait error

Best Practices

1. Conversation Preparation

  • Prepare conversation appropriately
  • Validate conversation content
  • Handle different conversation types
  • Ensure conversation integrity

2. Error Handling

  • Check all response codes
  • Handle wait failures
  • Implement retry logic
  • Log error conditions

3. Performance Optimization

  • Minimize conversation waiting
  • Use efficient conversation formats
  • Optimize partner updates
  • Manage partner resources

Explain It Like I'm 5 Years Old

Imagine you're waiting for a friend to call:

When you want to wait for a friend to call, you sit by the phone and wait for it to ring. You know that when the phone rings, it means your friend is calling you.

CICS WAIT CONVID (APPC) is like waiting for a friend to call. The computer program waits for a conversation event (like the phone ringing) and when it happens, the program knows that something important has happened and can continue with its work.

Just like you wait for your friend to call, the computer program waits for conversation events!

Exercises

Exercise 1: Conversation Waiting

Write a CICS WAIT CONVID (APPC) command to wait for an APPC conversation event.

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EXEC CICS WAIT CONVID
    CONVID(WS-CONVERSATION-ID)
    RESP(WS-RESPONSE)
    RESP2(WS-RESPONSE2)
END-EXEC.

Exercise 2: Conversation Processing

How would you implement comprehensive conversation processing that handles different conversation types and partner requirements?

Answer: Identify different conversation types and appropriate handling, implement conversation validation and encoding, handle different partner types and capabilities, implement proper error handling for conversation waiting failures, optimize conversation waiting for performance, and maintain conversation integrity throughout the process.

Quiz

Question 1

What is the primary purpose of CICS WAIT CONVID (APPC)?

Answer: B) To wait for APPC conversation events

Question 2

Which parameter specifies the conversation ID to wait for?

Answer: A) CONVID

Related Concepts

CICS APPC Conversation Processing

APPC conversation processing and output in CICS

CICS Partner Management

Partner management and user interaction in CICS

CICS Output Processing

Output processing and conversation display in CICS