如何计算断路器在春季重试时的正确超时?

我知道怎么做 @CircuitBreaker 注释应该可以工作,但不确定 resetTimeout 参数值。

我有一个应用程序,它每10秒钟就不断请求其他外部服务。每个请求可能需要1-3秒。默认三次尝试都可以,所以我想40秒后 openTimeout 应该没问题。我决定将80秒设置为 重置超时 . 据我所知,如果在40秒内发生3次故障,则电路将在resetTimeout参数中指定的时间(80秒)内断开。

在测试过程中,我注意到,如果电路开路,并且另一个请求传入,则不会调用外部服务。没关系,但我希望以后 重置超时 (80年代)将调用从未发生过的真正服务。

奇怪的是,如果电路断开并且在重置超时(80s)期间未调用服务,则电路将重置。IMHO spring应该比较当前时间和断路故障,当前看起来它将当前时间与上次请求进行比较。

我是否误解了这个图书馆的概念?

服务:

  package test;

import org.springframework.retry.annotation.CircuitBreaker;
import org.springframework.retry.annotation.Recover;
import org.springframework.stereotype.Component;
import org.springframework.web.client.RestClientException;

@Component
class ConnectionService {

    @CircuitBreaker(include = { RestClientException.class }, openTimeout = 10_000, resetTimeout = 20_000)
    String doUpload(String payload) {
        if(payload.contentEquals("FAIL")) {
            throw new RestClientException("");
        }
        System.out.println("real service called");
        //callling external service....
        return payload;
    }

    @Recover
    public String recover(String payload) {
        return "recovered";
    }
}

测试:

package test;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.runners.MockitoJUnitRunner;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.retry.RetryCallback;
import org.springframework.retry.RetryContext;
import org.springframework.retry.RetryListener;
import org.springframework.retry.annotation.EnableRetry;

@RunWith(MockitoJUnitRunner.class)
public class SpringRetryTest {

    AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(
            SpringRetryTest.TestConfiguration.class);
    ConnectionService connectionService = context.getBean(ConnectionService.class);

    @Test
    public void testCircuitBreaker() throws InterruptedException {

        incorrectStep();
        incorrectStep();
        incorrectStep();
        incorrectStep();
        incorrectStep();
        System.out.println();
        System.out.println();
        System.out.println();

        final long l = System.currentTimeMillis();
        correctStep(l);
        correctStep(l);
        correctStep(l);
        correctStep(l);
        correctStep(l);
        correctStep(l);
        correctStep(l);
        correctStep(l);
        correctStep(l);
        correctStep(l);
        correctStep(l);
        correctStep(l);
        correctStep(l);
        correctStep(l);
        correctStep(l);
        correctStep(l);
        correctStep(l);
        correctStep(l);
        correctStep(l);
        correctStep(l);
        correctStep(l);
        correctStep(l);

        //wait more than resetTimeout
        System.out.println();
        System.out.println();
        System.out.println();
        Thread.sleep(21_000L);
        correctStep(l);

    }

    private void incorrectStep() throws InterruptedException {
        doFailedUpload(connectionService);
        Thread.sleep(1_000L);
        System.out.println();
    }

    private void correctStep(final long l) throws InterruptedException {
        doCorrectUpload(connectionService);
        Thread.sleep(1_000L);
        printTime(l);
    }

    private void printTime(final long l) {
        System.out.println(String.format("%d ms after last failure", (System.currentTimeMillis() - l)));
    }

    private void doFailedUpload(ConnectionService externalService) throws InterruptedException {
        System.out.println("before fail");
        externalService.doUpload("FAIL");
        System.out.println("after fail");
        Thread.sleep(900);
    }

    private void doCorrectUpload(ConnectionService externalService) throws InterruptedException {
        System.out.println("before ok");
        externalService.doUpload("");
        System.out.println("after ok");
        Thread.sleep(900);
    }

    @Configuration
    @EnableRetry
    protected static class TestConfiguration {

        @Bean
        public ConnectionService externalService() {
            return new ConnectionService();
        }

        @Bean
        public RetryListener retryListener1() {
            return new RetryListener() {
                @Override
                public <T, E extends Throwable> boolean open(final RetryContext retryContext, final RetryCallback<T, E> retryCallback) {
                    System.out.println("----/ ---- open, retry count:" + retryContext.getRetryCount());
                    return true;
                }

                @Override
                public <T, E extends Throwable> void close(final RetryContext retryContext, final RetryCallback<T, E> retryCallback, final Throwable throwable) {
                    System.out.println("---------- close, retry count:" + retryContext.getRetryCount());
                }

                @Override
                public <T, E extends Throwable> void onError(final RetryContext retryContext, final RetryCallback<T, E> retryCallback, final Throwable throwable) {
                    System.out.println("onError, retry count:" + retryContext.getRetryCount());
                }

            };
        }

    }

}

我使用的是osx 10.12.6、java 1.8.0\u 144 spring:4.2.3。RELEASE和spring重试:1.2.1。版本(我的同事也测试了1.2.2,结果相同)