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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# Copyright (c) 2017 Cisco and/or its affiliates.
#
# 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.
#
def SchedulingAlgebra(cls, concurrent_mixin=object, composition_mixin=object,
sequential_mixin=object): # allow_none = True
class BaseElement(cls):
def __default__(cls, *elements):
elts = [e for e in elements
if e is not None and not isinstance(e, Empty)]
if len(elts) == 0:
# The first is always Empty
assert len(elements) != 0
return elements[0]
elif len(elts) == 1:
return elts[0]
return cls(*elts)
def __concurrent__(*elements):
return BaseElement.__default__(Concurrent, *elements)
def __composition__(*elements):
return BaseElement.__default__(Composition, *elements)
def __sequential__(*elements):
return BaseElement.__default__(Sequential, *elements)
# Operator: |
__or__ = __concurrent__
# Operator: >
__gt__ = __sequential__
# Operator: @
__matmul__ = __composition__
class Element(BaseElement):
def __iter__(self):
yield self
class Operator(BaseElement):
def __init__(self, *elements):
super().__init__()
self._elements = list(elements)
def __iter__(self):
yield self
for element in self._elements:
for x in element:
yield x
class Concurrent(Operator, concurrent_mixin):
# Algebraic rule : ((A // B) // C) ~ (A // B // C)
def __concurrent__(self, other):
self._elements.append(other)
return self
def __repr__(self):
return '<Concurrent {}>'.format(self._elements)
class Composition(Operator, composition_mixin):
def __repr__(self):
return '<Composition {}>'.format(self._elements)
class Sequential(Operator, sequential_mixin):
def __repr__(self):
return '<Sequential {}>'.format(self._elements)
class Empty(Element):
def __concurrent__(self, other):
return other
def __composition__(self, other):
return other
def __sequential__(self, other):
return other
def __repr__(self):
return '<Empty>'
return Element, Empty
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