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CICS DEFINE COMPOSITE EVENT - Composite Event Definition and Configuration

CICS DEFINE COMPOSITE EVENT provides composite event definition and configuration capabilities in CICS environments. It enables programs to define composite events, configure event parameters, and set up event definitions for CICS applications.

What is CICS DEFINE COMPOSITE EVENT?

CICS DEFINE COMPOSITE EVENT is a command that allows programs to define composite events, configure event parameters, and set up event definitions in CICS environments. It provides composite event definition capabilities, parameter configuration, and event setup for CICS applications.

Command Syntax

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EXEC CICS DEFINE COMPOSITE EVENT
    EVENTID(event-id)
    [DESCRIPTION(description-text)]
    [EVENTTYPE(event-type)]
    [TRIGGER(trigger-condition)]
    [RESP(response-code)]
END-EXEC

Parameters

Required Parameters

  • EVENTID - Unique identifier for the composite event

Optional Parameters

  • DESCRIPTION - Descriptive text for the composite event
  • EVENTTYPE - Type of composite event being defined
  • TRIGGER - Trigger condition for the composite event
  • RESP - Response code variable

Composite Event Types

Sequential Events

Events that occur in a specific sequence

  • • ORDERED SEQUENCE - Events that must occur in a specific order
  • • TIMED SEQUENCE - Events that occur within specific time intervals
  • • DEPENDENT SEQUENCE - Events that depend on previous event completion
  • • CHAINED SEQUENCE - Events that trigger subsequent events automatically

Parallel Events

Events that can occur simultaneously

  • • CONCURRENT EVENTS - Events that can execute in parallel
  • • SYNCHRONIZED EVENTS - Events that must complete together
  • • COORDINATED EVENTS - Events that coordinate their execution
  • • BATCHED EVENTS - Events that are processed as a group

Conditional Events

Events that depend on specific conditions

  • • CONDITIONAL TRIGGER - Events triggered by specific conditions
  • • THRESHOLD EVENTS - Events triggered when thresholds are reached
  • • PATTERN EVENTS - Events triggered by pattern matching
  • • RULE-BASED EVENTS - Events triggered by business rules

Complex Events

Events with complex relationships and logic

  • • HIERARCHICAL EVENTS - Events organized in hierarchical structures
  • • NESTED EVENTS - Events that contain other events
  • • AGGREGATED EVENTS - Events that combine multiple sub-events
  • • DERIVED EVENTS - Events derived from other event combinations

Programming Examples

Basic Composite Event Definition

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. DEFINE01.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  EVENT-ID         PIC X(8) VALUE 'EVT001'.
       01  DESCRIPTION      PIC X(50) VALUE 'Order Processing Composite Event'.
       01  EVENT-TYPE       PIC X(20) VALUE 'SEQUENTIAL'.
       01  TRIGGER-COND     PIC X(30) VALUE 'ORDER_RECEIVED'.
       01  RESPONSE-CODE    PIC S9(8) COMP.
       
       PROCEDURE DIVISION.
           EXEC CICS DEFINE COMPOSITE EVENT
               EVENTID(EVENT-ID)
               DESCRIPTION(DESCRIPTION)
               EVENTTYPE(EVENT-TYPE)
               TRIGGER(TRIGGER-COND)
               RESP(RESPONSE-CODE)
           END-EXEC
           
           IF RESPONSE-CODE = DFHRESP(NORMAL)
               DISPLAY 'Composite event defined successfully'
           ELSE
               DISPLAY 'Failed to define composite event'
           END-IF
           
           EXEC CICS RETURN END-EXEC.

Parallel Event Definition

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. DEFINE02.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  EVENT-ID         PIC X(8) VALUE 'EVT002'.
       01  DESCRIPTION      PIC X(50) VALUE 'Parallel Processing Composite Event'.
       01  EVENT-TYPE       PIC X(20) VALUE 'PARALLEL'.
       01  TRIGGER-COND     PIC X(30) VALUE 'DATA_READY'.
       01  RESPONSE-CODE    PIC S9(8) COMP.
       
       PROCEDURE DIVISION.
           EXEC CICS DEFINE COMPOSITE EVENT
               EVENTID(EVENT-ID)
               DESCRIPTION(DESCRIPTION)
               EVENTTYPE(EVENT-TYPE)
               TRIGGER(TRIGGER-COND)
               RESP(RESPONSE-CODE)
           END-EXEC
           
           IF RESPONSE-CODE = DFHRESP(NORMAL)
               DISPLAY 'Parallel composite event defined'
               DISPLAY 'Event ID: ' EVENT-ID
               DISPLAY 'Event Type: ' EVENT-TYPE
               DISPLAY 'Trigger: ' TRIGGER-COND
           ELSE
               DISPLAY 'Failed to define parallel composite event'
           END-IF
           
           EXEC CICS RETURN END-EXEC.

Error Handling with Event Definition

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       IDENTIFICATION DIVISION.
       PROGRAM-ID. DEFINE03.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  EVENT-ID         PIC X(8) VALUE 'EVT003'.
       01  DESCRIPTION      PIC X(50) VALUE 'Conditional Processing Event'.
       01  EVENT-TYPE       PIC X(20) VALUE 'CONDITIONAL'.
       01  TRIGGER-COND     PIC X(30) VALUE 'THRESHOLD_EXCEEDED'.
       01  RESPONSE-CODE    PIC S9(8) COMP.
       
       PROCEDURE DIVISION.
           EXEC CICS DEFINE COMPOSITE EVENT
               EVENTID(EVENT-ID)
               DESCRIPTION(DESCRIPTION)
               EVENTTYPE(EVENT-TYPE)
               TRIGGER(TRIGGER-COND)
               RESP(RESPONSE-CODE)
           END-EXEC
           
           EVALUATE RESPONSE-CODE
               WHEN DFHRESP(NORMAL)
                   DISPLAY 'Composite event defined successfully'
                   DISPLAY 'Event ID: ' EVENT-ID
               WHEN DFHRESP(DUPRES)
                   DISPLAY 'Composite event already exists'
               WHEN DFHRESP(INVREQ)
                   DISPLAY 'Invalid definition request'
               WHEN DFHRESP(EVENTERR)
                   DISPLAY 'Event-specific error occurred'
               WHEN DFHRESP(PARAMERR)
                   DISPLAY 'Parameter error in definition'
               WHEN OTHER
                   DISPLAY 'Unexpected error occurred'
           END-EVALUATE
           
           EXEC CICS RETURN END-EXEC.

Event Configuration

Trigger Conditions

  • • Data Triggers - Events triggered by data changes or availability
  • • Time Triggers - Events triggered by time-based conditions
  • • State Triggers - Events triggered by system state changes
  • • External Triggers - Events triggered by external system events

Event Relationships

  • • Parent-Child - Hierarchical relationships between events
  • • Predecessor-Successor - Sequential relationships between events
  • • Peer Relationships - Equal-level relationships between events
  • • Dependency Relationships - Events that depend on other events

Event Processing

  • • Immediate Processing - Events processed as soon as they occur
  • • Deferred Processing - Events queued for later processing
  • • Batch Processing - Events processed in groups or batches
  • • Scheduled Processing - Events processed at scheduled times

Event Monitoring

  • • Status Monitoring - Track the status of composite events
  • • Performance Monitoring - Monitor event processing performance
  • • Error Monitoring - Track errors in event processing
  • • Audit Monitoring - Log and audit event processing activities

Error Handling

Common Response Codes

  • DFHRESP(NORMAL) - Composite event defined successfully
  • DFHRESP(DUPRES) - Composite event already exists
  • DFHRESP(INVREQ) - Invalid definition request
  • DFHRESP(EVENTERR) - Event-specific error
  • DFHRESP(PARAMERR) - Parameter error in definition
  • DFHRESP(DEFINEERR) - Definition-specific error

Performance Considerations

Definition Efficiency

  • • Optimize event parameters - Use appropriate values for event types and triggers
  • • Minimize definition overhead - Reduce the computational cost of event definitions
  • • Use efficient definition patterns - Implement definition strategies that minimize resource usage
  • • Monitor definition performance - Track the performance impact of definition operations

Resource Impact

  • • Monitor resource usage - Track how definition operations consume system resources
  • • Optimize resource allocation - Ensure efficient allocation of resources for definitions
  • • Manage resource cleanup - Properly release resources after definition operations
  • • Track resource utilization - Monitor the overall resource consumption patterns

Best Practices

Composite Event Definition Best Practices

  • • Always check response codes
  • • Use appropriate definition parameters
  • • Implement proper error handling
  • • Set realistic trigger conditions
  • • Use meaningful event descriptions
  • • Optimize definition operations
  • • Clean up resources properly

Explain It Like I'm 5 Years Old

Think of CICS DEFINE COMPOSITE EVENT like setting up a chain reaction:

  • • Chain Name: "What to call your chain" - The event ID
  • • Instructions: "How the chain works" - The description
  • • Chain Type: "What kind of chain" - The event type
  • • Starting Point: "What starts the chain" - The trigger
  • • Setup: "Getting everything ready" - Defining the event

Exercises

Exercise 1: Basic Composite Event Definition

Create a program that defines a basic composite event with standard parameters.

Exercise 2: Event Type Configuration

Write a program that defines composite events with different event types.

Exercise 3: Error Handling

Implement comprehensive error handling for composite event definition failures and parameter errors.

Related Concepts

Event Management

Managing system events

Event Configuration

Configuring event parameters

Composite Processing

Processing composite operations

Event Triggers

Managing event triggers

Error Handling

Managing definition errors