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S)zAbstract Protocol base classes.)�BaseProtocol�Protocol�DatagramProtocol�SubprocessProtocol�BufferedProtocolc�.�eZdZdZdZd�Zd�Zd�Zd�ZdS)raCommon base class for protocol interfaces.

    Usually user implements protocols that derived from BaseProtocol
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    �c��dS)z�Called when a connection is made.

        The argument is the transport representing the pipe connection.
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�excs  r�connection_lostzBaseProtocol.connection_lostrrc��dS)aCalled when the transport's buffer goes over the high-water mark.

        Pause and resume calls are paired -- pause_writing() is called
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        (even if subsequent writes increases the buffer size even
        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
        through EventLoop.call_soon() -- if it were, it would have no
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pause_writingzBaseProtocol.pause_writing%rrc��dS)zvCalled when the transport's buffer drains below the low-water mark.

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__module__�__qualname__�__doc__�	__slots__r
rrrrrrrr	sa���������I����������,����rrc�"�eZdZdZdZd�Zd�ZdS)ranInterface for stream protocol.

    The user should implement this interface.  They can inherit from
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    nothing (they don't raise exceptions).

    When the user wants to requests a transport, they pass a protocol
    factory to a utility function (e.g., EventLoop.create_connection()).

    When the connection is made successfully, connection_made() is
    called with a suitable transport object.  Then data_received()
    will be called 0 or more times with data (bytes) received from the
    transport; finally, connection_lost() will be called exactly once
    with either an exception object or None as an argument.

    State machine of calls:

      start -> CM [-> DR*] [-> ER?] -> CL -> end

    * CM: connection_made()
    * DR: data_received()
    * ER: eof_received()
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    rc��dS)zTCalled when some data is received.

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data_receivedzProtocol.data_received^rrc��dS�z�Called when the other end calls write_eof() or equivalent.

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    and control the receive buffer.  Event loops can then use the buffer
    provided by the protocol to avoid unnecessary data copies.  This
    can result in noticeable performance improvement for protocols that
    receive big amounts of data.  Sophisticated protocols can allocate
    the buffer only once at creation time.

    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()
    rc��dS)aPCalled to allocate a new receive buffer.

        *sizehint* is a recommended minimal size for the returned
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get_bufferzBufferedProtocol.get_buffer�rrc��dS)z�Called when the buffer was updated with the received data.

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r �addrs   r�datagram_receivedz"DatagramProtocol.datagram_received�rrc��dS)z~Called when a send or receive operation raises an OSError.

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