Friday, March 16, 2007

ServerSocket HAS-A queue

Default queue of 50 waiting "patrons" to our restaurant. If a patron arrives when the queue is full, the connection is refused.

Each "successful" patron would be allocated a dining table ie an address:port on the server-side.

The operating system stores incoming connection requests addressed to a particular port in a first-in, first-out queue. The default length of the queue is normally 50, though this can vary from operating system to operating system. Some operating systems (though not Solaris) have a maximum queue length, typically five. On these systems, the queue length will be the largest possible value less than or equal to 50. After the queue fills to capacity with unprocessed connections, the host refuses additional connections on that port until slots in the queue open up. Many (though not all) clients will try to make a connection multiple times if their initial attempt is refused. Managing incoming connections and the queue is a service provided by the operating system; your program does not need to worry about it. Several ServerSocket constructors allow you to change the length of the queue if its default length isn't large enough; however, you won't be able to increase the queue beyond the maximum size that the operating system supports.

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