Detecting Dead Clients
There is, however, a significant problem with the chat server as it is currently written. A client might crash for some reason before sending a LOGOFF event to the server, or a LOGOFF event might be sent but get lost on the network. In this case, the server will think that the user is logged in and continue to send messages to the client. Over long periods of time, the server may fill up with such phantom users. There are a number of solutions to this problem:
The server times out inactive users Each time the server receives an event from a user, such as joining or departing a channel, it records the time the event occurred in the corresponding ChatObjects::User object. At periodic intervals, the server checks all users ...
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