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Resilience4j

What it is

Resilience4j is an open-source JVM resilience library that provides composable, functional-style implementations of the standard resilience primitives:

• CircuitBreaker — state-machine wrapping of a failure- prone call (patterns/circuit-breaker).
• Retry — configurable retry with exponential backoff and jitter.
• TimeLimiter — wraps a CompletionStage with a deadline, canonical implementation of patterns/time-limiter-wrapping-chained-calls.
• Bulkhead — bounds concurrent calls to a dependency.
• RateLimiter — token-bucket style rate limiting.
• Cache — memoises successful results.

It is the canonical successor to Netflix Hystrix (archived 2018), designed for Java 8+ with lambda-style composition and without Hystrix's heavyweight thread-pool model.

Why it shows up in resilience guidance

Resilience4j is the library Zalando's timeouts post cites as the implementation target for its chained-call time-limiter guidance:

"There is also a nice TimeLimiter module provided by the Resilience4j library." (Source: sources/2023-07-25-zalando-all-you-need-to-know-about-timeouts)

Its primitives compose, so a client can stack TimeLimiter.compose(CircuitBreaker.compose(Retry.compose( ...))) on the same CompletionStage-returning call — matching the Zalando house-style rule that retries must be paired with circuit breakers, and chained calls must be time-limited.

Seen in

• sources/2023-07-25-zalando-all-you-need-to-know-about-timeouts — cited as the canonical JVM implementation of the TimeLimiter pattern for chained calls.

Related

• patterns/circuit-breaker — the pattern its CircuitBreaker module implements.
• patterns/time-limiter-wrapping-chained-calls — the pattern its TimeLimiter module implements.
• patterns/retry-on-5xx-not-4xx — complements its Retry module.
• concepts/exponential-backoff-jitter — the strategy the Retry module implements.
• systems/java-completablefuture — the CompletionStage primitive Resilience4j composes around.