Resilience4j is a fault tolerance library for Java™

Resilience4j is a lightweight fault tolerance library inspired by Netflix Hystrix, but designed for functional programming.
Resilience4j provides higher-order functions (decorators) to enhance any functional interface, lambda expression or method reference with a Circuit Breaker, Rate Limiter, Retry or Bulkhead. You can stack more than one decorator on any functional interface, lambda expression or method reference. The advantage is that you have the choice to select the decorators you need and nothing else.

Supplier<String> supplier = () -> service.sayHelloWorld(param1);

String result = Decorators.ofSupplier(supplier)
  .withFallback(asList(CallNotPermittedException.class, BulkheadFullException.class),  
      throwable -> "Hello from fallback")

With Resilience4j you don’t have to go all-in, you can pick what you need.

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Examples of resilience4j-ratelimiter

Create a RateLimiterRegistry

Create a RateLimiterRegistry with a custom RateLimiterConfig.

// Create a custom configuration for a RateLimiter
RateLimiterConfig config = RateLimiterConfig.custom()

// Create a RateLimiterRegistry with a custom global configuration
RateLimiterRegistry registry = RateLimiterRegistry.of(config);

Override the RegistryStore

You can override the im-memory RegistryStore by a custom implementation. For example, if you want to use a Cache which removes unused instances after a certain period of time.

RateLimiterRegistry rateLimiterRegistry = RateLimiterRegistry.custom()
  .withRegistryStore(new CacheRateLimiterRegistryStore())


Examples of resilience4j-ratelimiter

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