Hands-On Microservices with Spring Boot and Spring Cloud

Sample usage of the circuit breaker in Resilience4j

Let's assume we have a REST service that is protected by a circuit breaker via Resilience4j called myService.

If the service starts to produce internal errors, for example, because it can't reach a service it depends on, we might get a response from the service such as 500 Internal Server Error. After a number of configurable attempts, the circuit will open and we will get a fast failure that returns an error message such as CircuitBreaker 'myService' is open. When the error is resolved and we make a new attempt (after the configurable wait time), the circuit breaker will allow a new attempt as a probe. If the call succeeds, the circuit breaker will be closed again; that is, it is operating ...