详解如何在SpringBoot中优雅地重试调用第三方API

public interface OutSource {
    List<Integer> getResult() throws TimeOutException;
}

@Service
public class OutSourceImpl implements OutSource {

    static Random random = new Random();
    @Override
    public List<Integer> getResult() {
        //mock failure
        if (random.nextInt(2) == 1)
            throw new TimeOutException();
        return List.of(1, 2, 3);
    }
}


@Slf4j
@Service
public class ManuallyRetryService {

    @Autowired
    private OutSource outSource;

    public List<Integer> getOutSourceResult(String data, int retryTimes) {
        log.info("trigger time:{}", retryTimes);

        if (retryTimes > 3) {
            return List.of();
        }

        try {
            List<Integer> lst = outSource.getResult();
            if (!CollectionUtils.isEmpty(lst)) {
                return lst;
            }

            log.error("getOutSourceResult error, data:{}", data);
        } catch (TimeOutException e) {
            log.error("getOutSourceResult timeout", e);
        }
        // 递归调用
        return getOutSourceResult(data, retryTimes + 1);
    }

}

@Slf4j
@RestController
public class RetryTestController {

    @Autowired
    private ManuallyRetryService manuallyRetryService;
    
    @GetMapping("manually")
    public String manuallyRetry() {
        List<Integer> result = manuallyRetryService.getOutSourceResult("haha", 0);
        if (!CollectionUtils.isEmpty(result)) {
            return "ok";
        }
        return "fail";
    }
}

implementation 'org.springframework.boot:spring-boot-starter-aop''org.springframework.boot:spring-boot-starter-aop'
implementation 'org.springframework.retry:spring-retry'

<dependency>
    <groupId>org.springframework.retry</groupId>
    <artifactId>spring-retry</artifactId>
</dependency>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-aop</artifactId>
</dependency>

@SpringBootApplication
//看过来
@EnableRetry
public class TestSpringApplication {

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

}

public interface OutSource {
    List<Integer> getResult() throws TimeOutException;
}

@Service
public class OutSourceImpl implements OutSource {

    static Random random = new Random();
    @Override
    public List<Integer> getResult() {
        //mock failure will throw an exception every time
        throw new TimeOutException();
    }
}

@Slf4j
@Service
public class RetryableService {

    @Autowired
    private OutSource outSource;

    // 看这里
    @Retryable(value = {TimeOutException.class}, maxAttempts = 3)
    public List<Integer> getOutSourceResult(String data) {
        log.info("trigger timestamp:{}", System.currentTimeMillis() / 1000);

        List<Integer> lst = outSource.getResult();
        if (!CollectionUtils.isEmpty(lst)) {
            return lst;
        }
        log.error("getOutSourceResult error, data:{}", data);

        return null;
    }

}


@Slf4j
@RestController
public class RetryTestController {

    @Autowired
    private RetryableService retryableService;

    @GetMapping("retryable")
    public String manuallyRetry2() {
        try {
            List<Integer> result = retryableService.getOutSourceResult("aaaa");
            if (!CollectionUtils.isEmpty(result)) {
                return "ok";
            }
        } catch (Exception e) {
            log.error("retryable final exception", e);
        }
        return "fail";
    }

}