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��4]�1�@s@dZddlmZddlmZGdd�de�ZGdd�de�ZdS)	aDeprecated core event interfaces.


.. deprecated:: 0.7
    As of SQLAlchemy 0.7, the new event system described in
    :ref:`event_toplevel` replaces the extension/proxy/listener system,
    providing a consistent interface to all events without the need for
    subclassing.

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�PoolListenera�	Hooks into the lifecycle of connections in a :class:`.Pool`.

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       the :class:`.PoolEvents` listener interface.

    Usage::

        class MyListener(PoolListener):
            def connect(self, dbapi_con, con_record):
                '''perform connect operations'''
            # etc.

        # create a new pool with a listener
        p = QueuePool(..., listeners=[MyListener()])

        # add a listener after the fact
        p.add_listener(MyListener())

        # usage with create_engine()
        e = create_engine("url://", listeners=[MyListener()])

    All of the standard connection :class:`~sqlalchemy.pool.Pool` types can
    accept event listeners for key connection lifecycle events:
    creation, pool check-out and check-in.  There are no events fired
    when a connection closes.

    For any given DB-API connection, there will be one ``connect``
    event, `n` number of ``checkout`` events, and either `n` or `n - 1`
    ``checkin`` events.  (If a ``Connection`` is detached from its
    pool via the ``detach()`` method, it won't be checked back in.)

    These are low-level events for low-level objects: raw Python
    DB-API connections, without the conveniences of the SQLAlchemy
    ``Connection`` wrapper, ``Dialect`` services or ``ClauseElement``
    execution.  If you execute SQL through the connection, explicitly
    closing all cursors and other resources is recommended.

    Events also receive a ``_ConnectionRecord``, a long-lived internal
    ``Pool`` object that basically represents a "slot" in the
    connection pool.  ``_ConnectionRecord`` objects have one public
    attribute of note: ``info``, a dictionary whose contents are
    scoped to the lifetime of the DB-API connection managed by the
    record.  You can use this shared storage area however you like.

    There is no need to subclass ``PoolListener`` to handle events.
    Any class that implements one or more of these methods can be used
    as a pool listener.  The ``Pool`` will inspect the methods
    provided by a listener object and add the listener to one or more
    internal event queues based on its capabilities.  In terms of
    efficiency and function call overhead, you're much better off only
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    Either or both of the ``execute()`` and ``cursor_execute()``
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    cursor level executions, e.g.::

        class MyProxy(ConnectionProxy):
            def execute(self, conn, execute, clauseelement,
                        *multiparams, **params):
                print "compiled statement:", clauseelement
                return execute(clauseelement, *multiparams, **params)

            def cursor_execute(self, execute, cursor, statement,
                               parameters, context, executemany):
                print "raw statement:", statement
                return execute(cursor, statement, parameters, context)

    The ``execute`` argument is a function that will fulfill the default
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    The proxy is installed into an :class:`~sqlalchemy.engine.Engine` via
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        e = create_engine('someurl://', proxy=MyProxy())

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