| David Kranz | 6308ec2 | 2012-02-22 09:36:48 -0500 | [diff] [blame] | 1 | # Copyright 2011 Quanta Research Cambridge, Inc.
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| 2 | #
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| 3 | # Licensed under the Apache License, Version 2.0 (the "License");
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| 4 | # you may not use this file except in compliance with the License.
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| 5 | # You may obtain a copy of the License at
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| 6 | #
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| 7 | # http://www.apache.org/licenses/LICENSE-2.0
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| 8 | #
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| 9 | # Unless required by applicable law or agreed to in writing, software
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| 10 | # distributed under the License is distributed on an "AS IS" BASIS,
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| 11 | # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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| 12 | # See the License for the specific language governing permissions and
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| 13 | # limitations under the License.
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| 14 | """A class to store the state of various persistent objects in the Nova
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| 15 | cluster, e.g. instances, volumes. Use methods to query to state which than
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| 16 | can be compared to the current state of the objects in Nova"""
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| 17 |
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| 18 |
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| 19 | class State(object):
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| 20 |
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| 21 | def __init__(self, **kwargs):
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| 22 | self._max_vms = kwargs.get('max_vms', 32)
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| 23 | self._instances = {}
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| 24 | self._volumes = {}
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| 25 |
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| 26 | # machine state methods
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| 27 | def get_instances(self):
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| 28 | """return the instances dictionary that we believe are in cluster."""
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| 29 | return self._instances
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| 30 |
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| 31 | def get_max_instances(self):
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| 32 | """return the maximum number of instances we can create."""
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| 33 | return self._max_vms
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| 34 |
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| 35 | def set_instance_state(self, key, val):
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| 36 | """Store `val` in the dictionary indexed at `key`."""
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| 37 | self._instances[key] = val
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| 38 |
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| 39 | def delete_instance_state(self, key):
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| 40 | """Delete state indexed at `key`."""
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| 41 | del self._instances[key]
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