| # Copyright 2011 Quanta Research Cambridge, Inc. |
| # |
| # 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. |
| """A class to store the state of various persistent objects in the Nova |
| cluster, e.g. instances, volumes. Use methods to query to state which than |
| can be compared to the current state of the objects in Nova""" |
| |
| |
| class State(object): |
| |
| def __init__(self, **kwargs): |
| self._max_vms = kwargs.get('max_vms', 32) |
| self._instances = {} |
| self._volumes = {} |
| |
| # machine state methods |
| def get_instances(self): |
| """return the instances dictionary that we believe are in cluster.""" |
| return self._instances |
| |
| def get_max_instances(self): |
| """return the maximum number of instances we can create.""" |
| return self._max_vms |
| |
| def set_instance_state(self, key, val): |
| """Store `val` in the dictionary indexed at `key`.""" |
| self._instances[key] = val |
| |
| def delete_instance_state(self, key): |
| """Delete state indexed at `key`.""" |
| del self._instances[key] |