584571c3d8
Garbage collection is triggered by io.murano.system.GC.collect() static method. Garbage collector destroys all object that are not reachable anymore. GC can handle objects with cross-references and isolated object graphs. When portion of object model becomes not reachable it destroyed in predictable order such that child objects get destroyed before their parents and, when possible, before objects that are subscribed to their destruction notifications. Internally, both pre-deployment garbage collection (that was done by comparision of ``Objects`` and ``ObjectsCopy``) and post-deployment orphan object collection are now done through the new GC. MuranoPL GC utilizes Python GC to track and collect objects. The main idea is to make ObjectStore have weak links only and prevent hard links in other dsl places so that only links between objects remain. Then prevent Python GC to automatically delete objects that are not used anymore and use gc.collect() to obtain a list of objects that are both not reachable and cannot be destroyed and then destroy them in the correct order. Targets-blueprint: dependency-driven-resource-deallocation Closes-Bug: #1619635 Closes-Bug: #1597747 Change-Id: I653d8f71f003afa0a1ea588c9d14198571f5ad14
68 lines
2.4 KiB
Python
68 lines
2.4 KiB
Python
# Copyright (c) 2014 Mirantis, Inc.
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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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import collections
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import six
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from murano.dsl import dsl_types
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class AttributeStore(object):
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def __init__(self):
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self._attributes = collections.defaultdict(lambda: {})
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@staticmethod
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def _get_attribute_key(tagged_object, owner_type, name):
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if isinstance(owner_type, dsl_types.MuranoTypeReference):
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owner_type = owner_type.type
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if isinstance(tagged_object, dsl_types.MuranoObjectInterface):
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tagged_object = tagged_object.object
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return tagged_object.object_id, (owner_type.name, name)
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def get(self, tagged_object, owner_type, name):
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key1, key2 = self._get_attribute_key(tagged_object, owner_type, name)
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return self._attributes[key1].get(key2)
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def set(self, tagged_object, owner_type, name, value):
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if isinstance(value, dsl_types.MuranoObjectInterface):
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value = value.id
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elif isinstance(value, dsl_types.MuranoObject):
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value = value.object_id
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key1, key2 = self._get_attribute_key(tagged_object, owner_type, name)
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if value is None:
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self._attributes[key1].pop(key2, None)
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else:
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self._attributes[key1][key2] = value
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def serialize(self, known_objects):
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return [
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[key1, key2[0], key2[1], value]
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for key1, inner in six.iteritems(self._attributes)
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for key2, value in six.iteritems(inner)
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if key1 in known_objects
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]
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def load(self, data):
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for item in data:
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if item[3] is not None:
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self._attributes[item[0]][(item[1], item[2])] = item[3]
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def forget_object(self, obj):
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if isinstance(obj, dsl_types.MuranoObjectInterface):
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obj = obj.id
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elif isinstance(obj, dsl_types.MuranoObject):
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obj = obj.object_id
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self._attributes.pop(obj, None)
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