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OpenStack Study: operation.py**** CubicPower OpenStack Study ****
# vim: tabstop=4 shiftwidth=4 softtabstop=4 # Copyright 2013 Embrane, 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. # # @author: Ivar Lazzaro, Embrane, Inc.
**** CubicPower OpenStack Study **** class Operation(object): """Defines a series of operations which shall be executed in order. the operations expected are procedures, return values are discarded """
**** CubicPower OpenStack Study **** def __init__(self, procedure, args=(), kwargs={}, nextop=None): self._procedure = procedure self.args = args[:] self.kwargs = dict(kwargs) self.nextop = nextop
**** CubicPower OpenStack Study **** def execute(self): args = self.args self._procedure(*args, **self.kwargs) return self.nextop
**** CubicPower OpenStack Study **** def execute_all(self): nextop = self.execute() while nextop: nextop = self.execute_all()
**** CubicPower OpenStack Study **** def has_next(self): return self.nextop is not None
**** CubicPower OpenStack Study **** def add_bottom_operation(self, operation): op = self while op.has_next(): op = op.nextop op.nextop = operation
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