12

是否可以根据错误状态代码在 spring 重试( https://github.com/spring-projects/spring-retry )中设置 RetryPolicy ?例如,我想HttpServerErrorException使用HttpStatus.INTERNAL_SERVER_ERROR状态码重试,即 503。因此它应该忽略所有其他错误代码 - [500 - 502] 和 [504 - 511]。

4

3 回答 3

9

RestTemplatehassetErrorHandler选项DefaultResponseErrorHandler是默认选项。

它的代码如下所示:

public void handleError(ClientHttpResponse response) throws IOException {
    HttpStatus statusCode = getHttpStatusCode(response);
    switch (statusCode.series()) {
        case CLIENT_ERROR:
            throw new HttpClientErrorException(statusCode, response.getStatusText(),
                    response.getHeaders(), getResponseBody(response), getCharset(response));
        case SERVER_ERROR:
            throw new HttpServerErrorException(statusCode, response.getStatusText(),
                    response.getHeaders(), getResponseBody(response), getCharset(response));
        default:
            throw new RestClientException("Unknown status code [" + statusCode + "]");
    }
}

因此,您可以为该方法提供自己的实现,以简化您RetryPolicy所需的状态代码。

于 2014-12-02T15:05:01.810 回答
7

对于其他面临同样问题的人,我发布了这个答案。实现自定义重试策略如下:

class InternalServerExceptionClassifierRetryPolicy extends ExceptionClassifierRetryPolicy {
public InternalServerExceptionClassifierRetryPolicy() {
    final SimpleRetryPolicy simpleRetryPolicy = new SimpleRetryPolicy();
    simpleRetryPolicy.setMaxAttempts(3);

    this.setExceptionClassifier(new Classifier<Throwable, RetryPolicy>() {
        @Override
        public RetryPolicy classify(Throwable classifiable) {
            if (classifiable instanceof HttpServerErrorException) {
                // For specifically 500 and 504
                if (((HttpServerErrorException) classifiable).getStatusCode() == HttpStatus.INTERNAL_SERVER_ERROR
                        || ((HttpServerErrorException) classifiable)
                                .getStatusCode() == HttpStatus.GATEWAY_TIMEOUT) {
                    return simpleRetryPolicy;
                }
                return new NeverRetryPolicy();
            }
            return new NeverRetryPolicy();
        }
    });
}}

Ans 简单地调用它如下:

RetryTemplate template = new RetryTemplate();
template.setRetryPolicy(new InternalServerExceptionClassifierRetryPolicy())
于 2018-05-16T18:21:31.650 回答
0

您还可以在 SinmpleRetryPolicy 的 retryableExceptions 列表中添加具体的错误代码。

Map<Class<? extends Throwable>, Boolean> retryableExceptions = new HashMap<>();
retryableExceptions.put(HttpClientErrorException.Unauthorized.class, true);
retryTemplate.setRetryPolicy(new SimpleRetryPolicy(5, retryableExceptions));
于 2021-12-21T09:50:04.523 回答