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How can I implement a Server, which is also a Client. I mean, it can call an operation or send some data to the Client actively.
There is nothing special to do. You just invoke on a proxy in the server, as usual.
For a callback example, have a look at demo/Ice/callback.0
But I don't think it's actively.
You mean muti-threads?0
I'm not sure I understand what you mean. Ice is inherently multi-threaded. However, you can use the main thread to call operations on proxies. Requests are dispatched in threads from the thread pool, and don't require the main thread.0
I'll think more about it.0