Master CICS event processing and event-driven architecture including CICS Business Event Publisher, event processing patterns, event-driven programming, and event correlation.
Event processing in CICS involves capturing, processing, and responding to business events and system events in real-time. It enables modern event-driven architectures that can respond to changes and events as they occur, providing more responsive and adaptive applications.
By the end of this tutorial, you'll understand CICS event processing concepts, CICS Business Event Publisher functionality, event processing patterns, event-driven programming techniques, and event correlation and routing for modern CICS applications.
Event processing in CICS involves capturing, processing, and responding to business events and system events in real-time. It includes CICS Business Event Publisher, event processing patterns, event-driven programming, and event correlation for modern CICS applications.
Think of event processing like having a smart assistant that watches everything happening in your house and automatically responds to events. When someone rings the doorbell, it turns on the lights. When the temperature drops, it turns on the heat. When you arrive home, it unlocks the door.
In CICS, event processing means your applications can automatically respond to things that happen - like when a customer places an order, when a payment is processed, or when data changes. Instead of constantly checking for changes, the system tells your application when something important happens, and your application can respond immediately.
CICS Business Event Publisher is a CICS component that captures and publishes business events from CICS applications. It provides real-time event processing, event filtering, event transformation, and event distribution capabilities for event-driven CICS applications.
Core event capture and publishing capabilities:
1234567891011121314151617181920212223242526272829303132Event Capture and Publishing: 1. Business Event Detection - Transaction completion events - Data change events - User action events - System state events 2. Event Data Collection - Event metadata capture - Context information collection - Timestamp and sequence tracking - Event correlation data 3. Event Publishing - Real-time event publishing - Event message formatting - Event distribution - Event delivery confirmation 4. Event Filtering - Event type filtering - Event content filtering - Event priority filtering - Event routing filtering Example Event Publishing: Event Type: Customer Order Placed Event ID: EVT-001-2024-01-15-001 Timestamp: 2024-01-15T10:30:15.123Z Customer ID: CUST001 Order Amount: $1,250.00 Status: Published Successfully
Configuring event publishing and processing:
1234567891011121314151617181920212223242526272829303132Event Configuration: 1. Event Definition - Event schema definition - Event metadata specification - Event validation rules - Event transformation rules 2. Publisher Configuration - Publisher settings - Event routing configuration - Event filtering rules - Event delivery options 3. Subscriber Configuration - Subscriber registration - Event subscription rules - Event processing configuration - Event handling procedures 4. Event Processing Rules - Event processing logic - Event correlation rules - Event routing rules - Event transformation rules Example Event Configuration: Event Name: CustomerOrderPlaced Schema: JSON Publisher: CICS_BEP Subscribers: OrderProcessing, InventoryUpdate Filter: OrderAmount > $100 Routing: Priority Queue
Event processing patterns in CICS include real-time event processing, event filtering and transformation, event correlation and routing, event-driven workflows, and event-based integration patterns for modern CICS application architectures.
Real-time event processing patterns:
12345678910111213141516171819202122232425262728293031Real-Time Event Processing: 1. Stream Processing - Continuous event streams - Real-time data processing - Low-latency processing - High-throughput processing 2. Event-Driven Processing - Event-triggered processing - Asynchronous processing - Non-blocking processing - Reactive processing 3. Pattern Matching - Event pattern detection - Complex event processing - Event sequence analysis - Event correlation analysis 4. Real-Time Analytics - Real-time metrics calculation - Real-time reporting - Real-time alerting - Real-time decision making Example Real-Time Processing: Event: Payment Processed Processing Time: < 10ms Pattern: Payment > $1000 Action: Send Alert Analytics: Update Dashboard
Event correlation and routing patterns:
12345678910111213141516171819202122232425262728293031Event Correlation and Routing: 1. Event Correlation - Event relationship detection - Event sequence correlation - Event dependency analysis - Event context correlation 2. Event Routing - Intelligent event routing - Event destination selection - Event priority routing - Event load balancing 3. Event Aggregation - Event data aggregation - Event summary generation - Event batch processing - Event consolidation 4. Event Transformation - Event data transformation - Event format conversion - Event enrichment - Event normalization Example Event Correlation: Event 1: Order Placed Event 2: Payment Processed Correlation: Same Order ID Action: Update Order Status Route: Order Management System
Event-driven programming in CICS involves designing applications that respond to events rather than following traditional request-response patterns. It includes event handlers, event listeners, event processing logic, and event-driven application architectures.
Implementing event handlers and listeners:
1234567891011121314151617181920212223242526272829303132Event Handlers and Listeners: 1. Event Handler Implementation - Event handler procedures - Event processing logic - Event response generation - Event error handling 2. Event Listener Registration - Event listener setup - Event subscription management - Event listener configuration - Event listener lifecycle 3. Event Processing Logic - Event data processing - Event validation - Event transformation - Event business logic 4. Event Response Generation - Event response creation - Event acknowledgment - Event result processing - Event status reporting Example Event Handler: Handler: ProcessOrderEvent Event: OrderPlaced Logic: Validate Order Data Action: Update Inventory Response: Order Confirmed Status: Success
Designing event-driven application architectures:
1234567891011121314151617181920212223242526272829303132Event-Driven Architecture: 1. Event-Driven Components - Event producers - Event consumers - Event processors - Event routers 2. Event Flow Design - Event flow patterns - Event processing pipelines - Event routing strategies - Event error handling 3. Event-Driven Integration - Event-based integration - Event-driven workflows - Event-driven orchestration - Event-driven coordination 4. Event-Driven Monitoring - Event flow monitoring - Event processing monitoring - Event performance monitoring - Event error monitoring Example Event-Driven Architecture: Producer: Order Management System Event: Order Placed Processor: Inventory System Consumer: Shipping System Flow: Order -> Inventory -> Shipping Monitoring: Real-time Dashboard
Event correlation and routing involves identifying relationships between events, determining event processing sequences, implementing intelligent routing strategies, and managing event flows for complex event-driven applications.
Advanced event correlation techniques:
1234567891011121314151617181920212223242526272829303132Event Correlation Techniques: 1. Temporal Correlation - Time-based event correlation - Event sequence correlation - Event timing analysis - Event duration correlation 2. Contextual Correlation - Event context correlation - Event metadata correlation - Event relationship correlation - Event dependency correlation 3. Pattern-Based Correlation - Event pattern matching - Complex event correlation - Event sequence patterns - Event behavior patterns 4. Rule-Based Correlation - Business rule correlation - Event rule matching - Event condition correlation - Event policy correlation Example Event Correlation: Event 1: Customer Login (10:30:00) Event 2: Product View (10:30:15) Event 3: Add to Cart (10:30:30) Correlation: Same Customer Session Pattern: Browsing Behavior Action: Send Recommendation
Intelligent event routing strategies:
12345678910111213141516171819202122232425262728293031Event Routing Strategies: 1. Content-Based Routing - Event content analysis - Event data routing - Event field routing - Event value routing 2. Priority-Based Routing - Event priority assignment - Priority queue routing - Event urgency routing - Event importance routing 3. Load-Based Routing - Event load balancing - Event capacity routing - Event performance routing - Event resource routing 4. Policy-Based Routing - Event policy routing - Event rule routing - Event compliance routing - Event security routing Example Event Routing: Event: High-Value Order Priority: High Route: VIP Processing Queue Load: Distribute across servers Policy: Enhanced Security Check
Event processing and event-driven architecture in CICS enables modern, responsive applications that can react to events in real-time. Through CICS Business Event Publisher, event processing patterns, event-driven programming, and event correlation, CICS applications can achieve greater responsiveness and adaptability.
Understanding event processing concepts, event publisher functionality, event processing patterns, event-driven programming techniques, and event correlation strategies is essential for implementing modern event-driven CICS applications that can respond to business events and system changes in real-time.