java - 如果响应时间过长，则取消休息请求

Question

如果响应时间超过 3 秒，我想取消 REST 请求，但我还没有弄清楚如何做到这一点。

假设我有一个线程 A:

@Override
public void run() {
    RestTemplate restTemplate = new RestTemplate();
    IsAliveMessage isAliveMessage = new IsAliveMessage(nodeInfo.getHostname(), nodeInfo.getPort());
    IsAliveResponse isAliveResponse = restTemplate.postForObject(
        "http://" + nodeInfo.getHostname() + ":" + nodeInfo.getPort() + "/node/isAlive",
         isAliveMessage,
         IsAliveResponse.class);
}

发出请求并期望 B 给出答复:

@RequestMapping( value="/isAlive", method= RequestMethod.POST)
    public IsAliveResponse isAlive() throws ConnectException {
        try {
            Thread.sleep(100000);
            IsAliveResponse response = new IsAliveResponse("here here!" ,true);
            return response;
        } catch (Exception e) {
            Thread.currentThread().interrupt();
    }
}

B“睡着了”并且没有回答，但 A 一直在等待答案的到来。如何让A在一定时间后放弃等待？

提前致谢

Answer 1

您可以将 RestTemplate 配置为等待三秒以获得响应，如下所示:

RestTemplate restTemplate = new RestTemplate(getClientHttpRequestFactory());

private ClientHttpRequestFactory getClientHttpRequestFactory() {
    int timeout = 3000;
    HttpComponentsClientHttpRequestFactory clientHttpRequestFactory =
    new HttpComponentsClientHttpRequestFactory();
    clientHttpRequestFactory.setConnectTimeout(timeout);
    clientHttpRequestFactory.setReadTimeout(timeout);
    return clientHttpRequestFactory;
}