正确处理运动衫中的后台通话 [英] Correct handling of background calls in jersey

问题描述

我必须对Web应用程序中的Web服务进行一些后台调用.通话的响应时间并不是很紧迫，对我而言几乎没有任何意义.它仅在极少数情况下会发生变化，在这种情况下，我将通过引发异常或记录故障或其他内容对此做出反应.现在，我要问的一个问题是在Jersey Client 2中正确处理此类紧急呼叫.

I have to do some background calls to a web service within a web application. The response of the call is not really time-critical and barely interesting for me. It changes only in rare cases, where I will react to it by throwing a exception, or logging the failure or something. My conrete question now refers to the correct handling of such asynch calls in Jersey Client 2.

选项1使用来自jersey的异步调用，但随后为每个响应启动一个线程.选项2立即启动一个线程，并从该线程内部使用jersey.

Option 1 uses the async calls from jersey, but then starts a thread for each response. Option 2 would immediatly start a thread and use jersey from inside this thread.

通常哪种方法更可取?

选项1

private static final  ExecutorService executorService = Executors.newFixedThreadPool(20);

-

Client client = ClientBuilder.newClient();
WebTarget target = client.target("somehost").path("somepath");

final AsyncInvoker asyncInvoker = target.request().async();

final Future<Response> responseFuture = asyncInvoker.post(Entity.json(myjsonobject));
executorService.execute(new Worker(responseFuture));

-工作者线程

  public class Worker implements Runnable {

     private Future<Response> futureResponse;

     public Worker(Future<Response> futureResponse){
         this.futureResponse = futureResponse;
     }

     @Override
     public void run() {
         try {
          final Response response = futureResponse.get();
          if(response.getStatus() == 500)
             doSomething();
         } catch(Exception e) {
             e.printStackTrace();
         }
      }
 }

选项2

private static final  ExecutorService executorService = Executors.newFixedThreadPool(20);

-

   executorService.execute(new Worker());

-工作者线程

  public class Worker implements Runnable {

     public Worker(){
     }

     @Override
     public void run() {
         try {
             Client client = ClientBuilder.newClient();
             WebTarget target = client.target("somehost").path("somepath");
             ClientResponse response = target.request().accept(MediaType.APPLICATION_JSON).post(Entity.json(myjsonobject), ClientResponse.class);
             if(response.getStatus() == 500) {
                  doSomething();
             }
          } catch(Exception e) {
                  e.printStackTrace();
          }
     }
 }

推荐答案

(而不是尝试实现非阻塞" Future.get()(使用另一个线程)，您可以简单地使使用 InvocationCallback ，将实例传递给 get 方法.例如

Instead of trying to implement a "non-blocking" Future.get() (with another thread), you can simply make use of the InvocationCallback, passing an instance to the get method. For example

Future<Response> future = target.request().async().get(new InvocationCallback<Response>(){
    @Override
    public void completed(Response response) {
        System.out.println(response.readEntity(String.class));
        response.close();
        client.close();
    }

    @Override
    public void failed(Throwable throwable) { /** Log exception **/ }
});

请参见异步客户端回调

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