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�ZdS)zAbstract Protocol base classes.)�BaseProtocol�Protocol�DatagramProtocol�SubprocessProtocol�BufferedProtocolc@s4eZdZdZdZdd�Zdd�Zdd�Zd	d
�ZdS)raCommon base class for protocol interfaces.

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        more), and eventually resume_writing() is called once when the
        buffer size reaches the low-water mark.

        Note that if the buffer size equals the high-water mark,
        pause_writing() is not called -- it must go strictly over.
        Conversely, resume_writing() is called when the buffer size is
        equal or lower than the low-water mark.  These end conditions
        are important to ensure that things go as expected when either
        mark is zero.

        NOTE: This is the only Protocol callback that is not called
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    When the connection is made successfully, connection_made() is
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    State machine of calls:

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    The idea of BufferedProtocol is that it allows to manually allocate
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    receive big amounts of data.  Sophisticated protocols can allocate
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    State machine of calls:

      start -> CM [-> GB [-> BU?]]* [-> ER?] -> CL -> end

    * CM: connection_made()
    * GB: get_buffer()
    * BU: buffer_updated()
    * ER: eof_received()
    * CL: connection_lost()
    rcCsdS)aPCalled to allocate a new receive buffer.

        *sizehint* is a recommended minimal size for the returned
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