A circuit breaker is a design pattern used in microservices architectures to prevent cascading failures. It temporarily halts the flow of requests to a service that is consistently failing or slow, allowing the system to recover and avoid overwhelming resources. In Spring Boot, the Resilience4j library is commonly used to implement circuit breakers.
For example, with Resilience4j in a Spring Boot application, you can annotate a method with @CircuitBreaker to wrap it in circuit breaker logic.
@CircuitBreaker(name = "backendService", fallbackMethod = "fallback")
public String callBackendService() {
return restTemplate.getForObject("http://example.com/api", String.class);
}
public String fallback(Throwable t) {
return "Fallback response";
}
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