root / snf-astakos-app / astakos / quotaholder_app / commission.py @ 548938f6
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# Copyright 2013 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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from astakos.quotaholder_app.exception import NoCapacityError, NoQuantityError |
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class Operation(object): |
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@staticmethod
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def assertions(holding): |
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assert(holding.usage_min <= holding.usage_max)
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@classmethod
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def _prepare(cls, holding, quantity, check=True): |
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raise NotImplementedError |
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@classmethod
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def prepare(cls, holding, quantity, check=True): |
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cls.assertions(holding) |
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cls._prepare(holding, quantity, check) |
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@classmethod
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def _finalize(cls, holding, quantity): |
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raise NotImplementedError |
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@classmethod
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def finalize(cls, holding, quantity): |
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cls.assertions(holding) |
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cls._finalize(holding, quantity) |
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@classmethod
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def undo(cls, holding, quantity): |
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cls.prepare(holding, -quantity, check=False)
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@classmethod
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def revert(cls, holding, quantity): |
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# Assertions do not hold when reverting
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cls._prepare(holding, -quantity, check=False)
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@classmethod
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def provision(cls, holding, quantity, importing=True): |
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return {'holder': holding.holder, |
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'source': holding.source,
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'resource': holding.resource,
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'quantity': quantity if importing else -quantity, |
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} |
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class Import(Operation): |
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@classmethod
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def _prepare(cls, holding, quantity, check=True): |
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usage_max = holding.usage_max |
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new_usage_max = usage_max + quantity |
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limit = holding.limit |
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if check and new_usage_max > limit: |
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holder = holding.holder |
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resource = holding.resource |
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m = ("%s has not enough capacity of %s." % (holder, resource))
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provision = cls.provision(holding, quantity, importing=True)
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raise NoCapacityError(m,
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provision=provision, |
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limit=limit, |
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usage=usage_max) |
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holding.usage_max = new_usage_max |
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holding.save() |
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@classmethod
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def _finalize(cls, holding, quantity): |
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holding.usage_min += quantity |
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holding.save() |
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class Release(Operation): |
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@classmethod
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def _prepare(cls, holding, quantity, check=True): |
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usage_min = holding.usage_min |
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new_usage_min = usage_min - quantity |
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if check and new_usage_min < 0: |
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holder = holding.holder |
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resource = holding.resource |
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m = ("%s attempts to release more %s than it contains." %
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(holder, resource)) |
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provision = cls.provision(holding, quantity, importing=False)
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raise NoQuantityError(m,
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provision=provision, |
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limit=0,
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usage=usage_min) |
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holding.usage_min = new_usage_min |
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holding.save() |
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@classmethod
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def _finalize(cls, holding, quantity): |
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holding.usage_max -= quantity |
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holding.save() |
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class Operations(object): |
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def __init__(self): |
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self.operations = []
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def prepare(self, operation, holding, quantity, force): |
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check = not force
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operation.prepare(holding, quantity, check) |
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self.operations.append((operation, holding, quantity))
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def revert(self): |
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for (operation, holding, quantity) in self.operations: |
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operation.revert(holding, quantity) |
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def finalize(operation, holding, quantity): |
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operation.finalize(holding, quantity) |
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def undo(operation, holding, quantity): |
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operation.undo(holding, quantity) |