将方法中的远程对象传递给 RMI 服务器？

发布于 2024-12-11 05:44:36 字数 404 浏览 0 评论 0原文

我有一个 RMI 客户端，它连接到某个 RMI 服务器，只是为了让它知道它可以使用这个新客户端。

我可以直接传递一些远程对象，以便：

serverRemoteObject.registerClient(theClientRemoteObjectTheServerShouldUse);

实际上给服务器一些他可以使用的对象，而无需连接到我的客户端吗？以下问题表示这是可能的，但没有给出真实的示例：

是否可以在两个类之间使用双向 RMI？

Andrew

原文

I have an RMI client that connects to some RMI server just to let it know it can use this new client.

Can I pass directly some Remote object so that:

serverRemoteObject.registerClient(theClientRemoteObjectTheServerShouldUse);

will actually give the server some object he can use without connecting to my client?
The following question says it is possible, but no real example was given:

Is it possible to use RMI bidirectional between two classes?

Andrew

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旧人 2024-12-18 05:44:36

是的，你可以。这就是 RMI 中回调的工作原理。您将一个对象发送到服务器，当服务器调用您的对象上的方法时，它将在“客户端”JVM 中执行，而不是在服务器上执行。查看 UnicastRemoteObject.export 方法，将实现 Remote 接口的任何对象导出为可以传递到服务器的远程对象。

interface UpdateListener extends Remote {

  public void handleUpdate(Object update) throws RemoteException;

}

class UpdateListenerImpl implements UpdateListener {

  public void handleUpdate(Object update) throws RemoteException {
  // do something
  }

}

//somewhere in your client code
final UpdateListener listener = new UpdateListenerImpl();
UnicastRemoteObject.export(listener);

Yes, you can. This is how exactly callbacks work in case of RMI. You send across an object to the server and when the server invokes a method on your object, it would be executed in the "client" JVM as opposed to on the server. Look into UnicastRemoteObject.export method for export any object which implements the Remote interface as a remote object which can be passed to your server.

interface UpdateListener extends Remote {

  public void handleUpdate(Object update) throws RemoteException;

}

class UpdateListenerImpl implements UpdateListener {

  public void handleUpdate(Object update) throws RemoteException {
  // do something
  }

}

//somewhere in your client code
final UpdateListener listener = new UpdateListenerImpl();
UnicastRemoteObject.export(listener);

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