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# Copyright 2012 GRNET S.A. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or
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# without modification, are permitted provided that the following
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# conditions are met:
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#
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#   1. Redistributions of source code must retain the above
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#      copyright notice, this list of conditions and the following
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#      disclaimer.
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#
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#   2. Redistributions in binary form must reproduce the above
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#      copyright notice, this list of conditions and the following
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#      disclaimer in the documentation and/or other materials
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#      provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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# The views and conclusions contained in the software and
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# documentation are those of the authors and should not be
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# interpreted as representing official policies, either expressed
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# or implied, of GRNET S.A.
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""" Module implementing connection and communication with an AMQP broker.
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AMQP Client's instatiated by this module silenty detect connection failures and
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try to reconnect to any available broker. Also publishing takes advantage of
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publisher-confirms in order to guarantee that messages are properly delivered
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to the broker.
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"""
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from synnefo import settings
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if settings.AMQP_BACKEND == 'puka':
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    from amqp_puka import AMQPPukaClient as Client
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elif settings.AMQP_BACKEND == 'haigha':
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    from amqp_haigha import AMQPHaighaClient as Client
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else:
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    raise Exception('Unknown Backend %s' % settings.AMQP_BACKEND)
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class AMQPClient(object):
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    """
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    AMQP generic client implementing most of the basic AMQP operations.
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    This class will create an object of AMQPPukaClient or AMQPHaigha client
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    depending on AMQP_BACKEND setting
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    """
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    def __new__(cls, *args, **kwargs):
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        return Client(*args, **kwargs)