Event-driven architecture (EDA) is a software design pattern that allows systems to respond to events in real time. It’s used in many applications, including online banking, streaming services, and multiplayer games. 

How it works 

  • Event producers: Create a stream of events
  • Event consumers: Listen for events and process them
  • Event channels: Transfer events from producers to consumers
  • Event broker: A messaging-oriented middleware that allows applications to publish and subscribe to events

Benefits of EDA 

  • Flexibility: Systems can adapt to new information and changing situations
  • Scalability: Components can be added or removed without affecting the current configuration
  • Real-time processing: Events are handled as they happen, allowing the system to manage time-sensitive tasks
  • Decentralized communication: Components communicate through events rather than direct connections

EDA topologies 

  • Broker topology: Components broadcast events to the entire system without any orchestrator
  • Mediator topology: There is a central orchestrator which controls workflow of events
  • Hybrid model: A combination of broker and mediator topologies
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