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CICS SIGNAL EVENT - Event Signaling

CICS SIGNAL EVENT provides event signaling capabilities in CICS environments. It enables programs to signal events, manage event operations, and handle event signaling for inter-program communication and coordination purposes.

Command Syntax

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       EXEC CICS SIGNAL EVENT
            [EVENT(event-name)]
            [FROM(data-area)]
            [LENGTH(data-length)]
            [RESP(response-code)]
            [RESP2(response-code-2)]
       END-EXEC.

Parameters

EVENT(event-name)

Specifies the name of the event to be signaled. This parameter identifies the specific event for signaling operations.

FROM(data-area)

Specifies the data area containing event data to be sent with the signal. This parameter provides event-specific information.

LENGTH(data-length)

Specifies the length of the event data to be sent. This parameter controls the amount of data transmitted with the event.

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.

Event Types

Business Events

SIGNAL EVENT triggers business events such as order completion, payment processing, and customer notifications for business process coordination.

System Events

The command supports system events for coordinating system operations, resource management, and system state changes.

Notification Events

Notification events enable programs to notify other programs or users about specific conditions or status changes.

Synchronization Events

Synchronization events coordinate program execution, data processing, and workflow synchronization across multiple programs.

Programming Examples

Basic Event Signaling

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       WORKING-STORAGE SECTION.
       01  EVENT-NAME        PIC X(16) VALUE 'ORDER-COMPLETE'.
       01  EVENT-DATA        PIC X(100) VALUE 'Order processed successfully'.
       01  DATA-LENGTH       PIC S9(8) COMP VALUE 100.
       01  RESPONSE-CODE     PIC S9(8) COMP.
       01  RESPONSE-CODE-2   PIC S9(8) COMP.
 
       PROCEDURE DIVISION.
           EXEC CICS SIGNAL EVENT
                EVENT(EVENT-NAME)
                FROM(EVENT-DATA)
                LENGTH(DATA-LENGTH)
                RESP(RESPONSE-CODE)
                RESP2(RESPONSE-CODE-2)
           END-EXEC
           
           IF RESPONSE-CODE = 0
               DISPLAY 'Event signaled successfully'
               DISPLAY 'Event: ' EVENT-NAME
               DISPLAY 'Data: ' EVENT-DATA
           ELSE
               DISPLAY 'Error signaling event: ' RESPONSE-CODE
           END-IF.

Multiple Event Signaling

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       WORKING-STORAGE SECTION.
       01  EVENT-NAME        PIC X(16).
       01  EVENT-DATA        PIC X(200).
       01  DATA-LENGTH       PIC S9(8) COMP.
       01  RESPONSE-CODE     PIC S9(8) COMP.
       01  RESPONSE-CODE-2   PIC S9(8) COMP.
       01  SIGNAL-COUNT      PIC S9(8) COMP VALUE 0.
 
       PROCEDURE DIVISION.
           PERFORM SIGNAL-ORDER-EVENT
           PERFORM SIGNAL-PAYMENT-EVENT
           PERFORM SIGNAL-NOTIFICATION-EVENT.
           
       SIGNAL-ORDER-EVENT.
           MOVE 'ORDER-PROCESSED' TO EVENT-NAME
           MOVE 'Order 12345 has been processed' TO EVENT-DATA
           MOVE FUNCTION LENGTH(EVENT-DATA) TO DATA-LENGTH
           EXEC CICS SIGNAL EVENT
                EVENT(EVENT-NAME)
                FROM(EVENT-DATA)
                LENGTH(DATA-LENGTH)
                RESP(RESPONSE-CODE)
                RESP2(RESPONSE-CODE-2)
           END-EXEC
           IF RESPONSE-CODE = 0
               ADD 1 TO SIGNAL-COUNT
               DISPLAY 'Order event signaled'
           END-IF.
           
       SIGNAL-PAYMENT-EVENT.
           MOVE 'PAYMENT-RECEIVED' TO EVENT-NAME
           MOVE 'Payment of $100.00 received' TO EVENT-DATA
           MOVE FUNCTION LENGTH(EVENT-DATA) TO DATA-LENGTH
           EXEC CICS SIGNAL EVENT
                EVENT(EVENT-NAME)
                FROM(EVENT-DATA)
                LENGTH(DATA-LENGTH)
                RESP(RESPONSE-CODE)
                RESP2(RESPONSE-CODE-2)
           END-EXEC
           IF RESPONSE-CODE = 0
               ADD 1 TO SIGNAL-COUNT
               DISPLAY 'Payment event signaled'
           END-IF.
           
       SIGNAL-NOTIFICATION-EVENT.
           MOVE 'NOTIFICATION-SENT' TO EVENT-NAME
           MOVE 'Customer notification sent' TO EVENT-DATA
           MOVE FUNCTION LENGTH(EVENT-DATA) TO DATA-LENGTH
           EXEC CICS SIGNAL EVENT
                EVENT(EVENT-NAME)
                FROM(EVENT-DATA)
                LENGTH(DATA-LENGTH)
                RESP(RESPONSE-CODE)
                RESP2(RESPONSE-CODE-2)
           END-EXEC
           IF RESPONSE-CODE = 0
               ADD 1 TO SIGNAL-COUNT
               DISPLAY 'Notification event signaled'
           END-IF.

Dynamic Event Signaling

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       WORKING-STORAGE SECTION.
       01  EVENT-NAME        PIC X(16).
       01  EVENT-DATA        PIC X(500).
       01  DATA-LENGTH       PIC S9(8) COMP.
       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 > 5
               PERFORM BUILD-EVENT-NAME
               PERFORM BUILD-EVENT-DATA
               PERFORM SIGNAL-EVENT
           END-PERFORM.
           
       BUILD-EVENT-NAME.
           STRING 'EVENT-' DELIMITED BY SIZE
                  PROCESSING-COUNT DELIMITED BY SIZE
                  INTO EVENT-NAME.
           
       BUILD-EVENT-DATA.
           STRING 'Processing step ' DELIMITED BY SIZE
                  PROCESSING-COUNT DELIMITED BY SIZE
                  ' completed at ' DELIMITED BY SIZE
                  FUNCTION CURRENT-DATE DELIMITED BY SIZE
                  INTO EVENT-DATA.
           MOVE FUNCTION LENGTH(EVENT-DATA) TO DATA-LENGTH.
           
       SIGNAL-EVENT.
           EXEC CICS SIGNAL EVENT
                EVENT(EVENT-NAME)
                FROM(EVENT-DATA)
                LENGTH(DATA-LENGTH)
                RESP(RESPONSE-CODE)
                RESP2(RESPONSE-CODE-2)
           END-EXEC
           
           IF RESPONSE-CODE = 0
               DISPLAY 'Event ' EVENT-NAME ' signaled successfully'
           ELSE
               DISPLAY 'Error signaling event ' EVENT-NAME ': ' RESPONSE-CODE
           END-IF.

Error Handling

Response Code 0

Successful event signaling. The event has been successfully signaled and is available for processing.

Response Code 8

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

Response Code 12

Invalid data length. The specified data length is invalid or exceeds maximum allowed length.

Response Code 16

Event signaling failed. The event signaling operation failed due to system conditions.

Response Code 20

Event not available. The specified event is not available for signaling in the current context.

Performance Considerations

Event Processing Efficiency

SIGNAL EVENT efficiently processes events, but excessive event signaling may impact system performance.

Event Data Management

Proper event data management ensures efficient event processing and prevents data overflow conditions.

Event Coordination

Event coordination ensures proper synchronization and prevents event conflicts in multi-program environments.

Best Practices

Error Handling

Always check response codes and handle errors appropriately, especially for event validation and system conditions.

Event Naming

Use meaningful event names that clearly identify the purpose and context of each event for effective coordination.

Event Data Management

Manage event data efficiently and ensure appropriate data lengths to optimize event processing performance.

Event Coordination

Implement proper event coordination strategies to ensure effective inter-program communication and synchronization.

Explain It Like I's 5 Years Old

Imagine you're playing a game with your friends, and you want to tell them something important happened. CICS SIGNAL EVENT is like waving your hand and shouting to get their attention.

The event name is like what you're shouting (like "I found the treasure!"), and the event data is like the extra information you want to tell them (like where you found it). You signal the event so everyone knows what happened.

Just like you need to make sure your friends can hear you, the program needs to make sure other programs can receive the event signal.

Exercises

Exercise 1: Basic Event Signaling

Write a program that uses SIGNAL EVENT to signal a business event with specific data and verify the signaling was successful.

Exercise 2: Multiple Event Coordination

Create a program that signals multiple events in sequence to coordinate business process steps.

Exercise 3: Dynamic Event Management

Implement an event management system that dynamically signals events based on business conditions and data.

Related Concepts

CICS Event Management

Understanding CICS event management and coordination

CICS Inter-Program Communication

Learning about CICS inter-program communication and coordination

CICS Business Process Management

Understanding CICS business process management and workflow

CICS Error Handling

Learning about CICS error handling and response codes