我正在探索resilience4j,并且希望既能够记录检查函数中断路器的故障,又能够返回有意义的结果。但是当我这样做时,失败似乎被计算为两倍。
我使用的是 0.13.1 版:
<dependency>
<groupId>io.github.resilience4j</groupId>
<artifactId>resilience4j-circuitbreaker</artifactId>
<version>0.13.1</version>
</dependency>
检查以下测试,我们有一个 10 的封闭环形缓冲区,这表明在 CircuitBreaker 可以跳闸之前应该评估 10 个调用。除非在onError
检查函数中使用断路器方法记录故障,否则会出现这种情况:
@Test
public void testRecordFailure() {
CircuitBreakerConfig config = CircuitBreakerConfig.custom()
.ringBufferSizeInClosedState(10)
.build();
CircuitBreakerRegistry registry = CircuitBreakerRegistry.of(config);
CircuitBreaker breaker1 = registry.circuitBreaker("breaker-1");
CircuitBreaker breaker2 = registry.circuitBreaker("breaker-2");
CheckedFunction0<String> supplier2 = CircuitBreaker.decorateCheckedSupplier(breaker2, () -> {
throw new RuntimeException();
});
CircuitBreaker breaker3 = registry.circuitBreaker("breaker-3");
CheckedFunction0<String> supplier3 = CircuitBreaker.decorateCheckedSupplier(breaker3, () -> {
breaker3.onError(0, new RuntimeException());
return "meaningful-result";
});
for (int i = 0; i < 4; i++) {
breaker1.onError(0, new RuntimeException());
Try.of(supplier2);
Try.of(supplier3);
}
assertEquals(CircuitBreaker.State.CLOSED, breaker1.getState()); // Success
assertEquals(CircuitBreaker.State.CLOSED, breaker2.getState()); // Success
assertEquals(CircuitBreaker.State.CLOSED, breaker3.getState()); // Success
breaker1.onError(0, new RuntimeException());
Try.of(supplier2);
Try.of(supplier3);
assertEquals(CircuitBreaker.State.CLOSED, breaker1.getState()); // Success
assertEquals(CircuitBreaker.State.CLOSED, breaker2.getState()); // Success
assertEquals(CircuitBreaker.State.CLOSED, breaker3.getState()); // Failure - circuit is now OPEN - why?
}
我无法找到这种行为的解释,或者是否存在一种方法来记录检查功能内的断路器故障。任何人都可以对此有所了解吗?
干杯!