Spring RestTemplate 不会使用超时设置

Question

在理解 RestTemplate 如何处理超时方面存在问题。

我将RestTemplate配置为Bean，如图所示：

@Bean
public RestTemplate rest(final RestTemplateBuilder builder) {
    final RestTemplate restTemplate = new RestTemplate(getClientHttpRequestFactory());
    return restTemplate;
}

private ClientHttpRequestFactory getClientHttpRequestFactory() {
    final int timeout = 50000;
    final RequestConfig config = RequestConfig.custom().setConnectTimeout(timeout).setConnectionRequestTimeout(timeout).setSocketTimeout(timeout).build();
    final CloseableHttpClient client = HttpClientBuilder.create().setDefaultRequestConfig(config).build();
    return new HttpComponentsClientHttpRequestFactory(client);
}

50000的价值只是学术价值。

我在 Hystrix 包装的服务连接器中使用我的 RestTemplate：

@HystrixCommand(commandProperties = { @HystrixProperty(name = "execution.isolation.strategy", value = "SEMAPHORE") }, fallbackMethod = "fallbackActivityCall")
public Optional<ResponseActivityValue> callForActivity() {
    final StringBuilder urlBuilder = new StringBuilder(accessConfig.getTracking().getUrl());
    final HttpEntity<String> entity = new HttpEntity<>(buildAuthHeader());

    final ResponseEntity<ResponseActivityValue> re = restTemplate.exchange(urlBuilder.toString(), HttpMethod.GET, entity, ResponseActivityValue.class);
    final HttpStatus code = re.getStatusCode();
    return Optional.ofNullable(re.getBody());
}

我使用停止呼叫的服务对其进行了测试。该方法在 3 秒后返回，而不是预期值 50000。我在 teRestTemplate 中配置的值无关紧要，它总是在 3 秒后返回。

有人有想法吗？

Answer 1

你可以直接使用RestTemplateBuilderbuilder来构建你的rest模板实例：如下

@Bean
public RestTemplate rest(final RestTemplateBuilder builder) {
    return builder
             .setConnectTimeout(50000)
             .setReadTimeout(50000)
             .build()
}

并尝试在application.properties 中设置 hysterix 的配置

hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds=50000

或者直接在你的命令中 (@HystrixProperty)

@HystrixCommand(
  commandProperties = { 
    @HystrixProperty(name = "execution.isolation.strategy", value = "SEMAPHORE"), 
    @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "50000")  
}, fallbackMethod = "fallbackActivityCall")
public Optional<ResponseActivityValue> callForActivity() {
 ....
}