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Abstract file handle class
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    File handle that can read and write asynchronously
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        Dispatch previously read data. Return True if self.reading and we don't
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        Returns False if we should stop reading for now
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        Returns false if we should stop writing for now
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        The connection was lost.

        This is called when the connection on a selectable object has been
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        Clean up state here, but make sure to call back up to FileDescriptor.
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        Close the connection at the next available opportunity.

        Call this to cause this FileDescriptor to lose its connection.  It will
        first write any data that it has buffered.

        If there is data buffered yet to be written, this method will cause the
        transport to lose its connection as soon as it's done flushing its
        write buffer.  If you have a producer registered, the connection won't
        be closed until the producer is finished. Therefore, make sure you
        unregister your producer when it's finished, or the connection will
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        This is called when a producer has lost its connection, to tell the
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