全球课程访问 [英] Access session in Global class

问题描述

我非常需要我的用户对象，因此我想将其存储在缓存中.由于不知道何时将其从缓存中销毁，因此我将其作为interceptor放置.所以我定义了以下代码:

I intensely need my user object so I thought I would store it in the Cache. Since I do not know when it is destroyed from the Cache, I though to put it as an interceptor. So I defined the following code:

@Override
public Action<?> onRequest(Request request, Method actionMethod) {
    // find the user based on the userId that is stored in the session
    // scope.
    String userId = session.get("user"); // does not work
    User loggedInUser = (User) Cache.get(userId);
    if (loggedInUser == null) {
        loggedInUser = User.getUerById(userSyscode);
    }
    return super.onRequest(request, actionMethod);
}

我认为我可以使用:

session.get("user");

但是在我看来，就像session无法从Global class访问一样，我做错了吗?

But it seems to me, like the session is not accessible from the Global class, am I doing something wrong?

推荐答案

我遇到了类似的问题，并通过动作组合"解决了. http://www.playframework.org/documentation/2.0.1/JavaActionsComposition

I had a similar problem and solved it with "action composition". http://www.playframework.org/documentation/2.0.1/JavaActionsComposition

或者，这是您要覆盖的onRequest的代码，所以我认为您可以做同样的事情，只需将代码放入call方法即可.

Alternatively, this is the code for onRequest that you are overriding, so I would think you can do the same thing and just put your code in the call method.

public Action onRequest(Request request, Method actionMethod) {
  return new Action.Simple() {
    public Result call(Context ctx) throws Throwable {

      /* your code here */

      return delegate.call(ctx);
    }
  };
}

我不知道session是否可以直接使用，但是此时您可以从ctx变量中获取它.我认为它会像ctx.session().get("user").

I don't know if session will be available directly, but at that point you can get to it from the ctx variable. I think it'll be something like ctx.session().get("user").

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