old_contents: # -*- coding: utf-8 -*-
  
  # vim: tabstop=4 shiftwidth=4 softtabstop=4
  
  #    Copyright (C) 2012 Yahoo! Inc. All Rights Reserved.
  #
  #    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.
  
  import inspect
  
  from taskflow import task
  
  
  class FunctorTask(task.Task):
      """A simple task that can wrap two given functions and allow them to be
      in combination used in apply and reverting a given task. Useful for
      situations where existing functions already are in place and you just want
      to wrap them up."""
  
      def __init__(self, name, apply_functor, revert_functor,
                   provides_what=None, extract_requires=False):
          super(FunctorTask, self).__init__(name)
          if not self.name:
              self.name = "%s_%s" % (apply_functor.__name__,
                                     revert_functor.__name__)
          self._apply_functor = apply_functor
          self._revert_functor = revert_functor
          self._requires = set()
          self._provides = set()
          if provides_what:
              self._provides.update(provides_what)
          if extract_requires:
              for a in inspect.getargspec(apply_functor).args:
                  if a in ('self', 'context',):
                      continue
                  self._requires.add(a)
  
      def requires(self):
          return set(self._requires)
  
      def provides(self):
          return set(self._provides)
  
      def apply(self, context, *args, **kwargs):
          return self._apply_functor(context, *args, **kwargs)
  
      def revert(self, context, result, cause):
          return self._revert_functor(context, result, cause)
  
new_contents: # -*- coding: utf-8 -*-
  
  # vim: tabstop=4 shiftwidth=4 softtabstop=4
  
  #    Copyright (C) 2012 Yahoo! Inc. All Rights Reserved.
  #
  #    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.
  
  import inspect
  
  from taskflow import task
  
  AUTO_ARGS = ('self', 'context',)
  
  
  class FunctorTask(task.Task):
      """A simple task that can wrap two given functions and allow them to be
      in combination used in apply and reverting a given task. Useful for
      situations where existing functions already are in place and you just want
      to wrap them up."""
  
      def __init__(self, name, apply_functor, revert_functor,
                   provides_what=None, extract_requires=False):
          if not name:
              name = "_".join([apply_functor.__name__, revert_functor.__name__])
          super(FunctorTask, self).__init__(name)
  
          self._apply_functor = apply_functor
          self._revert_functor = revert_functor
          self._requires = set()
          self._provides = set()
          if provides_what:
              self._provides.update(provides_what)
          if extract_requires:
              for arg_name in inspect.getargspec(apply_functor).args:
                  # These are automatically given, ignore.
                  if arg_name in AUTO_ARGS:
                      continue
                  self._requires.add(arg_name)
  
      def requires(self):
          return set(self._requires)
  
      def provides(self):
          return set(self._provides)
  
      def apply(self, context, *args, **kwargs):
          return self._apply_functor(context, *args, **kwargs)
  
      def revert(self, context, result, cause):
          return self._revert_functor(context, result, cause)
  
subject: Update automatic naming and arg checks.