Spring-使用断路器重试

Question

我正在尝试利用 spring-retry 的重试和断路器机制。我尝试在特定功能（如下所示）中同时使用注释（@Retryable 和 @CircuitBreaker），但断路器无法正常工作。

@Service
public class CommandAndRetry {

    private static final Logger LOGGER = LoggerFactory.getLogger(SampleRetryService.class);

    @CircuitBreaker(maxAttempts = 1, openTimeout = 10000)
    @Retryable(
            value = {TypeOneException.class},
            maxAttempts = 3, backoff = @Backoff(2000))
    public void retryWhenException() throws TypeOneException {
        LOGGER.info("Retrying");
        throw new TypeOneException();
    }

    @Recover
    public void recover(Throwable t) throws Throwable {
        LOGGER.info("SampleRetryService.recover");
        throw t;
    }
}

然后我尝试将功能分为两个不同的功能，分别具有@Retryable 和@CircuitBreaker。在这种情况下，重试机制不起作用。请在下面找到代码片段。

PS: 从控制器调用 exec 方法（断路器方法）。

@Service
public class CommandAndRetry {

    private static final Logger LOGGER = LoggerFactory.getLogger(SampleRetryService.class);


    @CircuitBreaker(maxAttempts = 1, openTimeout = 10000)
    public void exec() throws TypeOneException {
        retryWhenException();
    }

    @Retryable(
            value = {TypeOneException.class},
            maxAttempts = 3, backoff = @Backoff(2000))
    public void retryWhenException() throws TypeOneException {
        LOGGER.info("Retrying");
        throw new TypeOneException();
    }

    @Recover
    public void recover(Throwable t) throws Throwable {
        LOGGER.info("SampleRetryService.recover");
        throw t;
    }
}

谁能告诉我为什么会这样。

另请告知是否有更好的方法来实现重试和断路器。 PS：我既不想使用 resilience4j，也不想使用 retryTemplate。

Answer 1

如果你想在断路器中重试，它们必须在不同的 bean 中。如果您直接从另一个调用一个 @Retryable，在同一个 bean 中，您将绕过拦截器。

这对我来说很好...

@SpringBootApplication
@EnableRetry
public class So52193237Application {

    public static void main(String[] args) {
        SpringApplication.run(So52193237Application.class, args);
    }

    @Bean
    public ApplicationRunner runner(Foo foo) {
        return args -> {
            try {
                foo.exec();
            }
            catch (Exception e) {
                try {
                    foo.exec();
                }
                catch (Exception ee) {
                    Thread.sleep(11000);
                    try {
                        foo.exec();
                    }
                    catch (Exception eee) {

                    }
                }
            }
        };
    }

    @Component
    public static class Foo {

        private static final Logger LOGGER = LoggerFactory.getLogger(Foo.class);

        private final Bar bar;

        public Foo(Bar bar) {
            this.bar = bar;
        }

        @CircuitBreaker(maxAttempts = 1, openTimeout = 10000, resetTimeout=10000)
        public void exec() throws TypeOneException {
            LOGGER.info("Foo.circuit");
            this.bar.retryWhenException();
        }

        @Recover
        public void recover(Throwable t) throws Throwable {
            LOGGER.info("Foo.recover");
            throw t;
        }

    }

    @Component
    public static class Bar {

        private static final Logger LOGGER = LoggerFactory.getLogger(Bar.class);

        @Retryable(value = { TypeOneException.class }, maxAttempts = 3, backoff = @Backoff(2000))
        public void retryWhenException() throws TypeOneException {
            LOGGER.info("Retrying");
            throw new TypeOneException();
        }

        @Recover
        public void recover(Throwable t) throws Throwable {
            LOGGER.info("Bar.recover");
            throw t;
        }

    }

}

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