DeferredResult不是轮询

我试图从https://github.com/rstoyanchev/spring-mvc-chat DeferredResult不是轮询

创建使用基本例如，多用户聊天环境，我无法找到究竟是什么错我的代码。该请求没有轮询，只是持续向服务器发出请求。

以下是我的代码snipets

的web.xml

<servlet> 
    <servlet-name>dispatcher</servlet-name> 
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> 
    <load-on-startup>1</load-on-startup> 
    <async-supported>true</async-supported> 
</servlet> 
<servlet-mapping> 
    <servlet-name>dispatcher</servlet-name> 
    <url-pattern>/</url-pattern> 
</servlet-mapping>

的applicationContext.xml

<mvc:annotation-driven> 
    <mvc:async-support default-timeout="30000" /> 
    <mvc:message-converters register-defaults="false"> 
     <bean id="jacksonMessageConverter" 
      class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter" /> 
    </mvc:message-converters> 
</mvc:annotation-driven>

控制器

@Controller 
@RequestMapping("/chat") 
public class ChatController 
{ 
    @RequestMapping("messages") 
    @ResponseBody 
    public DeferredResult<List<String>> getMessages() 
    { 

     final DeferredResult<List<String>> deferredResult = new DeferredResult<List<String>>(30000l, Collections.emptyList()); 
     this.chatRequests.put(deferredResult, 0); 

     deferredResult.onCompletion(new Runnable() 
     { 
      @Override 
      public void run() 
      { 
       chatRequests.remove(deferredResult); 
      } 
     }); 

     List<String> messages = new ArrayList<String>(); 
     messages.add("first"); 
     if (!messages.isEmpty()) 
     { 
      deferredResult.setResult(messages); 
     } 

     return deferredResult; 
    } 

}

的JavaScript

function chatModel(){ 
var started = false; 
var that = this; 
that.activePollingXhr = ko.observable(null); 
function pollForMessages() { 
    that.activePollingXhr($.ajax({ 
     url : contextPath + '/chat/messages', 
     type : "GET", 
     cache : false, 
     success : function(messages) { 
      console.log(messages); 
     }, 
     error : function(xhr) { 
      if (xhr.statusText != "abort" && xhr.status != 503) { 
       console.log('Unable to Connect'); 
      } 
     }, 
     complete : pollForMessages 
    })); 
}

来源

2014-09-26 Rahul Thachilath

得到了问题。如果我们设置的结果

deferredResult.setResult();

它不等待这么进入递归调用。

来源

2014-09-29 11:27:00

DeferredResult不是轮询

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