Event-Driven Architecture in Practice

Event-driven architecture (EDA) has become increasingly important in modern enterprise systems. This post explores practical approaches to implementing EDA, focusing on real-world scenarios and lessons learned.

Understanding Event-Driven Architecture

At its core, EDA is about designing systems that produce, detect, consume, and react to events. But what makes a good event-driven system?

Key Components

1. Event Producers
2. Event Channels
3. Event Consumers
4. Event Store

Implementation Example

Here’s a practical example of implementing an event-driven system:

interface EventEmitter {
  emit(event: string, data: any): void;
  on(event: string, handler: (data: any) => void): void;
}

class OrderSystem {
  private eventEmitter: EventEmitter;

  constructor(eventEmitter: EventEmitter) {
    this.eventEmitter = eventEmitter;
  }

  async createOrder(order: Order): Promise<void> {
    // Process order
    await this.processOrder(order);
    
    // Emit event
    this.eventEmitter.emit('order.created', {
      orderId: order.id,
      timestamp: new Date(),
      data: order
    });
  }
}

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