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| |
| <h1 id="asyncresttemplate">使用AsyncRestTemplate开发服务消费者</h1> |
| <p><strong><em>注意</em></strong>: AsyncRestTemplate 接口在新版本的 Spring 接口中已经废弃。 建议使用异步 RPC 接口访问, 例如:</p> |
| <pre><code>interface Hello { |
| CompletableFuture<String> sayHi(String name); |
| } |
| |
| @Component |
| public class SomeBean { |
| ...... |
| |
| @RpcReference(microserviceName = "helloService", schemaId = "helloSchema") |
| private Hello hello; |
| |
| ...... |
| } |
| </code></pre> |
| <h2 id="_1">概念阐述</h2> |
| <p>AsyncRestTemplate 开发方式允许用户异步的进行服务调用。具体的业务流程和 RestTemplate 类似,只是这里以异步的形式进行服务的调用。</p> |
| <h2 id="_2">示例代码</h2> |
| <p>AsyncRestTemplate 实例通过 new CseAsyncRestTemplate()来创建和获取,再使用该实例通过自定义的 URL 进行服务调用。</p> |
| <ul> |
| <li>Spring MVC 客户端代码示例</li> |
| </ul> |
| <pre><code class="language-java"> |
| @Component |
| public class SpringmvcConsumerMain { |
| private static final Logger LOG = LoggerFactory.getLogger(SpringmvcConsumerMain.class); |
| |
| public static void main(String[] args) throws Exception { |
| init(); |
| Person person = new Person(); |
| person.setName("ServiceComb/Java Chassis"); |
| //AsyncRestTemplate Consumer |
| CseAsyncRestTemplate cseAsyncRestTemplate = new CseAsyncRestTemplate(); |
| ListenableFuture<ResponseEntity<String>> responseEntityListenableFuture = cseAsyncRestTemplate |
| .postForEntity("cse://springmvc/springmvchello/sayhi?name=Java Chassis", null, String.class); |
| ResponseEntity<String> responseEntity = responseEntityListenableFuture.get(); |
| System.out.println("AsyncRestTemplate Consumer sayHi services: " + responseEntity.getBody()); |
| |
| HttpEntity<Person> entity = new HttpEntity<>(person); |
| ListenableFuture<ResponseEntity<String>> listenableFuture = cseAsyncRestTemplate |
| .exchange("cse://springmvc/springmvchello/sayhello", HttpMethod.POST, entity, String.class); |
| // ResponseEntity<String> responseEntity1 = listenableFuture.get(); |
| // System.out.println("AsyncRestTemplate Consumer sayHello services: " + responseEntity1.getBody()); |
| //设置回调函数 |
| listenableFuture.addCallback( |
| new ListenableFutureCallback<ResponseEntity<String>>() { |
| @Override |
| public void onFailure(Throwable ex) { |
| LOG.error("AsyncResTemplate Consumer catched exception when sayHello, ", ex); |
| } |
| |
| @Override |
| public void onSuccess(ResponseEntity<String> result) { |
| System.out.println("AsyncRestTemplate Consumer sayHello services: " + result.getBody()); |
| } |
| }); |
| } |
| |
| public static void init() throws Exception { |
| Log4jUtils.init(); |
| BeanUtils.init(); |
| } |
| } |
| |
| </code></pre> |
| <blockquote> |
| <p>说明 :</p> |
| <ul> |
| <li>URL 的格式和 RestTemplate 一样,具体可以参考 restTemplate</li> |
| <li>这里用自定义的 ListenableFuture 类来作为占位符,获取远程调用结束后可能获取的结果。同时也可以自定义回调函数,对可能返回的结果进行分批处理。</li> |
| </ul> |
| </blockquote> |
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