In preparation for a talk I'm giving at DOSUG I'm going to post my thoughts as they develop.
Jumping back...
Miranda is composed of subsystems, each of which runs in its own thread. The threads communicate by means of Messages and BlockingQueues.
A thread simply takes the next Message off the queue and processes it.
The various subsystems of Miranda each have a State object. The states "know" how to process a Message (a method called processMessage), and common behavior, like shutting down or how to deal with a file change, is gathered into the superclasses of states.
Each state has a class it is partnered with that does the "real" work.
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