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CICS RESUME - Resume

CICS RESUME provides resume management capabilities, enabling resume processing and output processing in CICS environments. It provides efficient resume capabilities for CICS applications.

What is CICS RESUME?

CICS RESUME provides resume management capabilities, enabling resume processing and output processing. It provides efficient resume capabilities, allowing applications to manage resume operations.

Command Syntax

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EXEC CICS RESUME
    [RESP(response-code)]
    [RESP2(response-code-2)]
END-EXEC.

Parameters Explained

RESP Parameters

Response codes returned by the command:

  • RESP: Primary response code - indicates the success or failure of the resume operation
  • RESP2: Secondary response code - provides additional error information when RESP indicates failure
  • Always check these codes for command success before proceeding with data processing
  • Handle command failures appropriately to prevent application errors

Resume Types

1. Basic Resumes

  • Basic resumes: Standard resume operations that handle simple resuming without special formatting
  • Mapped resumes: Resume operations that use predefined field mappings to structure resume data
  • Unmapped resumes: Raw resume operations that handle unstructured resuming without predefined field mappings
  • Custom resumes: Specialized resume operations designed for specific application requirements

2. Advanced Resumes

  • Advanced resumes: Complex resume operations that handle sophisticated resuming processing and validation
  • Secure resumes: Resume operations that include encryption and security features for sensitive resuming
  • Encrypted resumes: Resume operations that automatically encrypt resume data
  • Compressed resumes: Resume operations that handle compressed resuming streams and automatically compress resume data

3. Specialized Resumes

  • Specialized resumes: Resume operations tailored for specific protocols or communication methods
  • High-performance resumes: Optimized resume operations designed for maximum throughput and efficiency
  • Low-latency resumes: Resume operations optimized for minimal delay and real-time processing requirements
  • High-throughput resumes: Resume operations designed to handle large volumes of resuming efficiently

Implementation Example

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WORKING-STORAGE SECTION.
01 WS-RESPONSE            PIC S9(8) COMP.
01 WS-RESPONSE2           PIC S9(8) COMP.
 
PROCEDURE DIVISION.
    * Resume operation
    EXEC CICS RESUME
        RESP(WS-RESPONSE)
        RESP2(WS-RESPONSE2)
    END-EXEC.
    
    IF WS-RESPONSE NOT EQUAL DFHRESP(NORMAL)
        EXEC CICS WRITE OPERATOR
            TEXT('RESUME command failed')
        END-EXEC
        EXEC CICS RETURN END-EXEC
    END-IF.
    
    * Resume operation completed successfully
    * Continue processing

Resume Processing

1. Resume Preparation

Resume preparation includes:

  • Resume validation - ensuring the resume operation is properly configured and authorized
  • Resume formatting - preparing data structures and buffers for resume data
  • Resume encoding - setting up proper character encoding and data transformation
  • Resume processing - initializing the resume operation and preparing for resuming

2. Resume Transmission

Resume transmission includes:

  • Resume routing - directing resume data to the appropriate processing location
  • Resume delivery - ensuring resume data reaches the correct destination within the application
  • Transmission confirmation - verifying that resume was completed successfully
  • Error handling - managing transmission failures and implementing retry mechanisms

3. Output Management

Output management includes:

  • User management - handling user sessions and maintaining connection state
  • Output formatting - structuring resume data for presentation or further processing
  • User experience - ensuring smooth data flow and responsive application behavior
  • Performance optimization - maximizing resume efficiency and minimizing resource usage

Common Response Codes

Success Response Codes

  • NORMAL (0): Resume operation completed successfully - resuming was completed without errors
  • RESUME (4): Resume operation completed - operation completed with resume-specific status

Error Response Codes

  • INVREQ (16): Invalid request - the resume operation parameters are incorrect or unauthorized
  • NOTFND (20): Resource not found - the specified resume resource does not exist
  • LENGERR (22): Length error - the resume data length exceeds expected limits
  • RESUME (24): Resume error - a resume-specific error occurred during the operation

Best Practices

1. Resume Preparation

  • Prepare resume appropriately - ensure all necessary resources and configurations are in place
  • Validate resume content - verify that resume data meets expected format and quality standards
  • Handle different resume types - implement flexible processing to accommodate various resuming formats
  • Ensure resume integrity - maintain data consistency and prevent corruption during resuming

2. Error Handling

  • Check all response codes - always examine both RESP and RESP2 for complete error information
  • Handle resume failures - implement appropriate recovery mechanisms for failed resume operations
  • Implement retry logic - provide automatic retry capabilities for transient failures
  • Log error conditions - maintain detailed logs for troubleshooting and monitoring purposes

3. Performance Optimization

  • Minimize resume operations - reduce unnecessary resume calls to improve overall performance
  • Use efficient resume formats - choose appropriate data formats to minimize processing overhead
  • Optimize user updates - streamline user interface updates to reduce response time
  • Manage user resources - efficiently allocate and manage system resources for resume operations

Explain It Like I'm 5 Years Old

Imagine you're starting to play again after stopping:

When you want to start playing again after stopping, you press the play button and the game continues. If you press the play button, the game continues. If you don't press the play button, the game stays stopped.

CICS RESUME is like pressing the play button on a game. The computer program presses the play button and the data continues. If it presses the play button, the data continues. If it doesn't press the play button, the data stays stopped.

Just like you press the play button on games, the computer program presses the play button on data!

Exercises

Exercise 1: Resume Operation

Write a CICS RESUME command to perform a resume operation.

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EXEC CICS RESUME
    RESP(WS-RESPONSE)
    RESP2(WS-RESPONSE2)
END-EXEC.

Exercise 2: Resume Processing

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

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

Quiz

Question 1

What is the primary purpose of CICS RESUME?

Answer: B) To provide resume management capabilities

Question 2

Which parameter specifies the response code?

Answer: A) RESP

Related Concepts

CICS Resume Processing

Resume processing and output in CICS

CICS User Management

User management and user interaction in CICS

CICS Output Processing

Output processing and resume display in CICS