java - 配置RetryTemplate测试除404之外的所有失败代码

Question

我对 Spring Boot 有点陌生，在设置 RetryTemplate 来重试除 404 之外的所有失败异常代码时遇到问题。以下是我的代码:

@Bean
public RetryTemplate createRetryTemplate() {
    SimpleRetryPolicy retryPolicy = new SimpleRetryPolicy();
    retryPolicy.setMaxAttempts(maxAttempts);

    UniformRandomBackOffPolicy backOffPolicy = new UniformRandomBackOffPolicy();
    backOffPolicy.setMinBackOffPeriod((long) minBackOffPeriod);
    backOffPolicy.setMaxBackOffPeriod(maxBackOffPeriod);

    RetryTemplate retryTemplate = new RetryTemplate();
    retryTemplate.setRetryPolicy(retryPolicy);
    retryTemplate.setBackOffPolicy(backOffPolicy);
    return retryTemplate;
}

我知道我需要制定一项政策，但不确定如何执行。任何帮助将不胜感激。

Answer 1

我会尝试使用ExceptionClassifierRetryPolicy来检测抛出的异常的类型，并根据该类型返回不同的重试策略:

class HttpStatusRetryPolicy extends ExceptionClassifierRetryPolicy {
    public HttpStatusRetryPolicy() {
        final NeverRetryPolicy doNotRetry = new NeverRetryPolicy();
        final SimpleRetryPolicy simpleRetryPolicy = new SimpleRetryPolicy();
        // configure your RetryPolicy here:
        // retryPolicy.setMaxAttempts(maxAttempts);
        // ...
        this.setExceptionClassifier(throwable -> {
            if (throwable instanceof HttpClientErrorException.NotFound) { // 404
                return doNotRetry;
            }
            return simpleRetryPolicy;
        });
    }
}