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CICS ENDBR - End Browse Operation

CICS ENDBR provides browse operation termination capabilities in CICS environments. It enables programs to end browse operations, manage file operations, and handle browse termination for proper resource cleanup and file management.

Command Syntax

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       EXEC CICS ENDBR
            [FILE(file-name)]
            [RESP(response-code)]
            [RESP2(response-code-2)]
       END-EXEC.

Parameters

FILE(file-name)

Specifies the name of the file for which the browse operation will be ended. This parameter identifies the target file for browse termination.

RESP(response-code)

Specifies the response code variable to receive the operation result. This parameter provides error handling and status information.

RESP2(response-code-2)

Specifies the secondary response code variable for additional error information. This parameter provides extended error details when available.

Browse Termination Types

Normal Browse End

ENDBR terminates browse operations normally, releasing file resources and completing the browse session for proper cleanup.

Emergency Browse End

The command supports emergency browse termination for handling error conditions and abnormal program termination.

Conditional Browse End

Conditional browse termination enables ending browse operations based on specific business rules and data conditions.

Resource Cleanup

Resource cleanup ensures proper release of file resources, locks, and browse cursors for optimal system performance.

Programming Examples

Basic Browse Termination

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       WORKING-STORAGE SECTION.
       01  FILE-NAME         PIC X(8) VALUE 'CUSTOMER'.
       01  RESPONSE-CODE     PIC S9(8) COMP.
       01  RESPONSE-CODE-2   PIC S9(8) COMP.
 
       PROCEDURE DIVISION.
           EXEC CICS ENDBR
                FILE(FILE-NAME)
                RESP(RESPONSE-CODE)
                RESP2(RESPONSE-CODE-2)
           END-EXEC
           
           IF RESPONSE-CODE = 0
               DISPLAY 'Browse operation ended successfully'
               DISPLAY 'File: ' FILE-NAME
               DISPLAY 'Resources released'
           ELSE
               DISPLAY 'Error ending browse: ' RESPONSE-CODE
           END-IF.

Multiple Browse Termination

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       WORKING-STORAGE SECTION.
       01  FILE-NAME         PIC X(8).
       01  RESPONSE-CODE     PIC S9(8) COMP.
       01  RESPONSE-CODE-2   PIC S9(8) COMP.
       01  END-COUNT         PIC S9(8) COMP VALUE 0.
 
       PROCEDURE DIVISION.
           PERFORM END-CUSTOMER-BROWSE
           PERFORM END-PRODUCT-BROWSE
           PERFORM END-ORDER-BROWSE.
           
       END-CUSTOMER-BROWSE.
           MOVE 'CUSTOMER' TO FILE-NAME
           EXEC CICS ENDBR
                FILE(FILE-NAME)
                RESP(RESPONSE-CODE)
                RESP2(RESPONSE-CODE-2)
           END-EXEC
           IF RESPONSE-CODE = 0
               ADD 1 TO END-COUNT
               DISPLAY 'Customer browse ended'
           END-IF.
           
       END-PRODUCT-BROWSE.
           MOVE 'PRODUCT' TO FILE-NAME
           EXEC CICS ENDBR
                FILE(FILE-NAME)
                RESP(RESPONSE-CODE)
                RESP2(RESPONSE-CODE-2)
           END-EXEC
           IF RESPONSE-CODE = 0
               ADD 1 TO END-COUNT
               DISPLAY 'Product browse ended'
           END-IF.
           
       END-ORDER-BROWSE.
           MOVE 'ORDER' TO FILE-NAME
           EXEC CICS ENDBR
                FILE(FILE-NAME)
                RESP(RESPONSE-CODE)
                RESP2(RESPONSE-CODE-2)
           END-EXEC
           IF RESPONSE-CODE = 0
               ADD 1 TO END-COUNT
               DISPLAY 'Order browse ended'
           END-IF.

Dynamic Browse Management

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       WORKING-STORAGE SECTION.
       01  FILE-NAME         PIC X(8).
       01  RESPONSE-CODE     PIC S9(8) COMP.
       01  RESPONSE-CODE-2   PIC S9(8) COMP.
       01  PROCESSING-COUNT  PIC S9(8) COMP VALUE 0.
 
       PROCEDURE DIVISION.
           PERFORM VARYING PROCESSING-COUNT FROM 1 BY 1
           UNTIL PROCESSING-COUNT > 3
               PERFORM BUILD-FILE-NAME
               PERFORM END-BROWSE-OPERATION
           END-PERFORM.
           
       BUILD-FILE-NAME.
           EVALUATE PROCESSING-COUNT
               WHEN 1
                   MOVE 'CUSTOMER' TO FILE-NAME
               WHEN 2
                   MOVE 'PRODUCT' TO FILE-NAME
               WHEN 3
                   MOVE 'ORDER' TO FILE-NAME
           END-EVALUATE.
           
       END-BROWSE-OPERATION.
           EXEC CICS ENDBR
                FILE(FILE-NAME)
                RESP(RESPONSE-CODE)
                RESP2(RESPONSE-CODE-2)
           END-EXEC
           
           IF RESPONSE-CODE = 0
               DISPLAY 'Browse ended for ' FILE-NAME
           ELSE
               DISPLAY 'Error ending browse for ' FILE-NAME ': ' RESPONSE-CODE
           END-IF.

Error Handling

Response Code 0

Successful browse termination. The browse operation has been successfully ended and resources have been released.

Response Code 8

Invalid file name. The specified file name is invalid or not supported.

Response Code 12

No active browse. There is no active browse operation for the specified file.

Response Code 16

End operation failed. The browse termination operation failed due to system conditions.

Response Code 20

Resource not available. The browse termination capability is not available in the current execution context.

Performance Considerations

Resource Release

ENDBR efficiently releases file resources, but delayed termination may impact system performance and resource availability.

Resource Management

Proper resource management ensures efficient browse operations and prevents resource leaks and system performance issues.

Cleanup Efficiency

Cleanup efficiency ensures optimal resource release and prevents resource exhaustion in high-volume environments.

Best Practices

Error Handling

Always check response codes and handle errors appropriately, especially for browse validation and resource availability.

Resource Cleanup

Implement proper resource cleanup by ensuring all browse operations are properly terminated to prevent resource leaks.

Browse Management

Manage browse operations efficiently by ending them at appropriate times and preventing unnecessary resource consumption.

Exception Handling

Implement proper exception handling to ensure browse operations are terminated even when errors occur during processing.

Explain It Like I's 5 Years Old

Imagine you're looking through a big book, and when you're done looking, you need to close the book and put it back on the shelf. CICS ENDBR is like closing the book and putting it back.

The file name is like the name of the book you were looking through. When you end the browse, you're telling the program that you're done looking at that book and it can put it away.

Just like you need to close books when you're done with them so other people can use them, the program needs to end browse operations so other programs can use the files.

Exercises

Exercise 1: Basic Browse Termination

Write a program that uses ENDBR to terminate a browse operation and verify the termination was successful.

Exercise 2: Multiple Browse Management

Create a program that manages multiple browse operations and terminates them appropriately.

Exercise 3: Exception Handling

Implement a browse management system that ensures browse operations are terminated even when errors occur.

Related Concepts

CICS File Management

Understanding CICS file management and operations

CICS Browse Operations

Learning about CICS browse operations and file access

CICS Resource Management

Understanding CICS resource management and cleanup

CICS Error Handling

Learning about CICS error handling and response codes