#!/usr/bin/python2.5

#

# Copyright 2009 the Melange authors.

#

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

#

#   http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

"""Middleware to set up and empty the value store.

"""

__authors__ = [

  '"Sverre Rabbelier" <sverre@rabbelier.nl>',

  ]

from soc.modules import callback

class ValueStoreMiddleware(object):

  """Middleware class to set up and empty the value store.

  """

  def start(self, request):

    """Sets up the value store.

    Args:

      request: a Django HttpRequest object

    """

    core = callback.getCore()

    core.startNewRequest(request)

  def end(self, request, optional):

    """Empties the value store.

    Args:

      request: a Django HttpRequest object

    """

    core = callback.getCore()

    core.endRequest(request, optional)

  def process_request(self, request):

    """Called when a request is made.

    See the Django middleware documentation for an explanation of

    the method signature.

    """

    self.start(request)

  def process_response(self, request, response):

    """Called when a response is returned.

    See the Django middleware documentation for an explanation of

    the method signature.

    """

    self.end(request, True)

    return response

  def process_exception(self, request, exception):

    """Called when an uncaught exception is raised.

    See the Django middleware documentation for an explanation of

    the method signature.

    """

    self.end(request, False)