Resilience4j在尝试过的方法中返回CompletableFuture

Question

我无法了解如何用Resilience4j包装同步方法，以便它返回一个CompletableFuture，尽管这似乎是Resilience4j的目标区域的一部分。特别是因为我想包装的同步方法可能引发异常。我想要的伪代码：

boolean void syncMethod() throws Exception {
    // May throw Exception due to connection/authorization problems.
}

CompletableFuture<Boolean> asyncResilience4jWrapper() {
    CompletableFuture<Boolean> result = 
        ...
            Resilience4j magic around "syncMethod()". 
            Trying 4 calls, interval between calls of 100 ms. 
        ...;
    return result;
}

Resilience4j应该尝试调用该方法4次，直到它放弃为止，每次调用间隔为100 ms，然后完成异步调用。asyncResilience4jWrapper调用者应该只返回一个不阻塞的CompletableFuture，而不关心这些。

Answer 1

ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(3);
TimeLimiter timeLimiter = TimeLimiter.of(Duration.ofSeconds(1));

CompletableFuture<Boolean> future = Decorators.ofCallable(() -> syncMethod)
    .withThreadPoolBulkhead(threadPoolBulkhead)
    .withTimeLimiter(timeLimiter, scheduledExecutorService)
    .withCircuitBreaker(circuitBreaker)
    .withFallback(asList(TimeoutException.class, CallNotPermittedException.class, BulkheadFullException.class),
      throwable -> "Hello from Recovery")
    .get().toCompletableFuture();

只需将withRetry添加到CircuitBreaker下面即可。