Spring RestTemplate 不会使用超时设置

Question

无法理解 RestTemplate 如何处理超时。

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());
}

我用停止呼叫的服务进行了测试。 3 秒后方法 returns 而不是预期值 50000。我在 te RestTemplate 中配置哪个值并不重要，它总是在 3 秒后 returns。

有人知道吗？

Answer 1

您可以直接使用 RestTemplateBuilder 构建器来构建您的 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

或者直接在您的命令中 (@HystrixProperty)

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

Spring RestTemplate 不会使用超时设置

Spring RestTemplate wont use timeout settings

java

spring

spring-boot

resttemplate

hystrix