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Event-Driven Architecture: Patterns and Implementation

Build reactive systems with event-driven architecture. Event sourcing, CQRS, and message brokers.

Ankit 14 min readFebruary 4, 2025

Event-Driven Architecture

Design systems around events for loose coupling and scalability.

Key Patterns

Event Sourcing

  • Store events, not state
  • Complete audit trail
  • Temporal queries

CQRS

  • Separate read/write models
  • Optimized queries
  • Scalability

Saga Pattern

  • Distributed transactions
  • Compensation logic
  • Eventual consistency

Message Brokers

  • Apache Kafka
  • RabbitMQ
  • AWS SQS/SNS

Benefits

  • Loose coupling
  • Scalability
  • Flexibility
  • Resilience

Challenges

  • Complexity
  • Eventual consistency
  • Debugging
  • Ordering

Conclusion

Event-driven architecture enables building highly scalable, resilient systems.

Event-DrivenCQRSArchitecture

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