如何使用Guice在GWT中的服务层（DAO）类中注入HttpSession对象？ [英] How to @Inject a HttpSession object in a service layer (DAO) class in GWT using Guice?

问题描述

在我的GWT应用程序中有这样一个脏代码，我的服务层的一些类依赖于 HttpSession 对象。例如，在我的一个DAO（这是一个GWT-RPC端点）中，我有类似这样的内容：

  public class MyExampleDAO扩展RemoteServiceServlet {
 public findItems（）{
 //这里我需要获取对象会话以检索当前登录的用户以查询其所有项目... 
} 
} 
  

问题是，我正在迁移代码以使用RequestFactory。我的DAO不再是GWT-RPC端点。因此，不需要扩展RemoteServiceServlet，然后......

你知道我可以如何获得/注入（可能带有

h2_lin>解决方案

getThreadLocalRequest（）。getSession（）应该这样做。 RequestFactoryServlet 有一个类似的（但是是静态的） getThreadLocalRequest（）方法，你可以从你的服务中访问。
否则，您可以让Guice注入 Provider< HttpSession> ，看看这些项目 https://github.com/mgenov/injecting-request-factory 和 https://github.com/etiennep/injected-requestfactory 了解使用Guice和RequestFactory的一些示例代码。

I have such a dirty code in my GWT app, some of the classes of my service layer depend on an HttpSession object. So for example, in one of my DAO (which was a GWT-RPC endpoint) I have something like this :

public class MyExampleDAO extends RemoteServiceServlet {
   public findItems() {
       // here I need to get the object session to retrieve the currently logged in user in order to query for all its items...
   }
}

The problem is that, I am currently migrating the code to use RequestFactory. My DAO will not be a GWT-RPC endpoint anymore. So no need to extend RemoteServiceServlet then ...

Do you know how I can get/inject (probably with Guice) my dependency to HttpSession Object, knowing that my class does not extend RemoteServiceServlet anymore?

解决方案

getThreadLocalRequest().getSession() should do it. RequestFactoryServlet has a similar (but static) getThreadLocalRequest() method that you can access from your service. Otherwise, you can get Guice to inject a Provider<HttpSession>, have a look at these projects https://github.com/mgenov/injecting-request-factory and https://github.com/etiennep/injected-requestfactory for some sample code using Guice with RequestFactory.

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