How to create "callback" in RMI

Question

hi all,
i have created a simple RMI that allow client to robotic control serverPC like move mouse and type on server PC.
These are 4 java file in my system.
1) serverInterface(extend Remote)
2) server(for rebind methos)
3) serverImpl(for pupose implement method)
4) RemoteClient
while,my serverImpl is extends UnicastRemoteObject.I am using j2sdk1.4.0.
My question is,how to create "callback" in my RMI system that allow server can send a message to client?
I would like to know what should i add into my current RMI System(for exampel,where should i add the exportObject method ?)
any hits are very welcome.Thanks in advanced.

Answer 1

Client does something like this:
serverRev.doRemoteOperation(this);
This passes a reference to the client object to the server.
Server does something like this:
void doRemoteMethod(Client client) {
String request = getRrequestId;
// Save reference to client for callback.
clientTable.put(requestId, client);
< kick off lengthy operation and return>
void notifyClient(String requestId) {
Client client = clientTable.get(requestId);
// callback to client.
client.notify();
}