root / trunk / src / haizea / policies / admission.py @ 632
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# -------------------------------------------------------------------------- #
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# Copyright 2006-2008, University of Chicago #
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# Copyright 2008, Distributed Systems Architecture Group, Universidad #
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# Complutense de Madrid (dsa-research.org) #
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# #
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# Licensed under the Apache License, Version 2.0 (the "License"); you may #
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# not use this file except in compliance with the License. You may obtain #
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# a copy of the License at #
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# #
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# http://www.apache.org/licenses/LICENSE-2.0 #
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# #
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# Unless required by applicable law or agreed to in writing, software #
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# distributed under the License is distributed on an "AS IS" BASIS, #
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. #
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# See the License for the specific language governing permissions and #
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# limitations under the License. #
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# -------------------------------------------------------------------------- #
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"""This module provides pluggable lease admission policies. See the documentation
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for haizea.core.schedule.policy.LeaseAdmissionPolicy for more details on
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lease admission policies.
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"""
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from haizea.core.scheduler.policy import LeaseAdmissionPolicy |
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from haizea.core.leases import Lease |
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class AcceptAllPolicy(LeaseAdmissionPolicy): |
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"""A simple admission policy: all lease requests are accepted.
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"""
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def __init__(self, slottable): |
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"""Constructor
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Argument
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slottable -- A fully constructed SlotTable
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"""
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LeaseAdmissionPolicy.__init__(self, slottable)
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def accept_lease(self, lease): |
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"""Lease admission function
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See class documentation for details on what policy is implemented here.
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Returns True if the lease can be accepted, False if it should be rejected.
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Argument
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lease -- Lease request
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"""
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return True |
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class NoARsPolicy(LeaseAdmissionPolicy): |
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"""A simple admission policy: all lease requests, except AR requests,
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are accepted.
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"""
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def __init__(self, slottable): |
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"""Constructor
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Argument
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slottable -- A fully constructed SlotTable
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"""
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LeaseAdmissionPolicy.__init__(self, slottable)
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def accept_lease(self, lease): |
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"""Lease admission function
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See class documentation for details on what policy is implemented here.
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Returns True if the lease can be accepted, False if it should be rejected.
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Argument
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lease -- Lease request
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"""
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return lease.get_type() != Lease.ADVANCE_RESERVATION
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