December 2000
Intermediate to advanced
784 pages
20h 54m
English
Content preview from Network Programming with Perl
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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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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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