DM-31507 Modify data-structures to aid ref counting #199
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andy-slac
approved these changes
Aug 25, 2021
| @@ -79,30 +77,32 @@ def __init__(self, butler: Butler, quantum: Quantum): | |||
| for refs in quantum.outputs.values(): | |||
| for ref in refs: | |||
| self.allOutputs.add((ref.datasetType, ref.dataId)) | |||
| self._butler_ = butler | |||
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Cannot you do self.__butler instead and avoid __getattribute__?
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I really was trying to be difficult, but really this is pragmatic enough I suppose.
| @@ -170,13 +174,17 @@ def __init__(self, config=None, name=None, parentTask=None, log=None): | |||
| self._display = lsstDebug.Info(self.__module__).display | |||
| else: | |||
| self._display = None | |||
| self._taskDict[self._fullName] = self | |||
| self._taskDict[self._fullName] = weakref.ref(self) | |||
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Would it be better to use WeakValueDictionary for self._taskDict?
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I dont know, I thought about that too, but then thought there might be some value to being able to see what keys were there at some point even if the reference was gone. Though this would probably only happen in the most obscure of debug cases, I was ready to punt thinking about it further to get the ticket in.
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It is desirable that variables get cleaned up when they go out of scope, meaning that their ref count must go to zero. Some objects kept closures or circular references which means they must be cleaned by the garbage collector which can happen at unpredictable times. Make these objects able to be dropped with reference counting.
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It is desirable that variables get cleaned up when they go out of
scope, meaning that their ref count must go to zero. Some objects
kept closures or circular references which means they must be
cleaned by the garbage collector which can happen at unpredictable
times. Make these objects able to be dropped with reference counting.
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