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# Event Management System The event system provides a robust publish-subscribe mechanism for handling asynchronous operations and communication between components in the Atlas Task Manager. ## Overview The event system enables: - Asynchronous communication between components - Batch processing of operations - Health monitoring and diagnostics - Event-driven architecture support ## Architecture ### Core Components #### EventManager - Manages event subscriptions - Handles event publishing - Coordinates event processing - Maintains event history #### BatchProcessor - Processes events in batches - Optimizes event handling - Manages event queues - Handles batch failures #### HealthMonitor - Monitors event system health - Tracks event processing metrics - Detects system issues - Reports system status ## Event Types ```typescript interface TaskEvent { type: TaskEventType; taskId: string; timestamp: number; metadata?: Record<string, unknown>; } enum TaskEventType { CREATED = 'TASK_CREATED', UPDATED = 'TASK_UPDATED', DELETED = 'TASK_DELETED', STATUS_CHANGED = 'TASK_STATUS_CHANGED', } ``` ## Usage Examples ```typescript // Subscribe to events eventManager.subscribe(TaskEventType.CREATED, async event => { console.log(`Task created: ${event.taskId}`); }); // Publish events await eventManager.publish({ type: TaskEventType.CREATED, taskId: 'task-123', timestamp: Date.now(), }); // Batch processing const batchProcessor = new BatchProcessor({ batchSize: 100, processInterval: 1000, }); batchProcessor.onBatch(async events => { // Process batch of events }); ``` ## Best Practices 1. **Event Design** - Keep events immutable - Include necessary context - Use clear event names - Version event schemas 2. **Error Handling** - Handle failed event processing - Implement retry mechanisms - Log event failures - Maintain event order 3. **Performance** - Use batch processing - Optimize event payload size - Monitor event queues - Handle backpressure 4. **Monitoring** - Track event metrics - Monitor system health - Alert on issues - Maintain event logs 5. **Testing** - Test event handlers - Verify event ordering - Simulate failures - Validate event schemas