An OTP Server
When we wrote our Fibonacci server in the previous chapter,, we had to do all the message handling ourselves. It wasn’t difficult, but it was tedious. Our scheduler also had to keep track of three pieces of state information: the queue of numbers to process, the results generated so far, and the list of active PIDs.
Most servers have a similar set of needs, so OTP provides libraries that do all the low-level work for us.
When we write an OTP server, we write a module containing one or more callback functions with standard names. OTP will invoke the appropriate callback to handle a particular situation. For example, when someone sends a request to our server, OTP will call our handle_call function, passing in the request, the caller, ...
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