First Move (11~18) - Code, Learn, Build
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First Move (11~18) - Code, Learn, Build

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← Java Enterprise Development|Level 3: Enterprise Microservices, Framework Architecture & Production Engineering

22. Microservices Architecture, Service Discovery & Circuit Breakers

Lesson 22 of 25
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Microservices Architecture, Service Discovery & Circuit Breakers

Architect distributed systems with Spring Cloud Eureka Service Discovery, Spring Cloud Gateway, Resilience4j Circuit Breakers, and OpenFeign client interfaces.

Resilience4j Circuit Breaker State Machine

### Circuit Breaker States - **CLOSED**: Normal operation. Requests flow to downstream service. - **OPEN**: Failure rate threshold exceeded. Requests immediately fail-fast returning fallback responses without hitting failing service. - **HALF_OPEN**: Permits trial requests to test if downstream service has recovered.
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