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−This module is an experiment about a more graceful shutdown process.
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−Why
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−===
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−When shutting down, a number of sessions, connections and other things
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−are teared down. Due to all these things happening very quickly,
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−sometimes eg client unavailable notifications don't make it to all
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−remote contacts because the server-to-server connections are teared down
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−just after.
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−
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−How
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−===
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−This module works by breaking the shutdown process into separate steps
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−with a brief pause between them.
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−It goes something like this
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−1.  Stop accepting new client connections.
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−2.  Close all client connections.
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−3.  Fire event for everything else.
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−4.  Tell `net.server` to quit the main loop.
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−5.  ???
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−6.  Still here? Kill itself.
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−