英語 での Weak references の使用例とその 日本語 への翻訳
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Is there a practical use for weak references?
Observers use weak references to nodes internally.
However, the garbage collector also supports weak references.
Each class keeps a list of weak references to its immediate subclasses.
Java theory and practice: Plugging memory leaks with weak references.
Each new-style class keeps a list of weak references to its immediate subclasses.
There are two specific object types which directly implement weak references.
Tree data structures, for instance, should use weak references for their parent and sibling references(if they need them!).
The managed heap contains two internal datastructures whose sole purpose is to manage weak references:.
Unlike normal(strong) references, weak references do not prevent the garbage collector from freeing that object.
The WeakKeyDictionary works similarly but uses weak references for the keys.
(Note: weak references are supported, that work with the Java garbage collector to allow for different strengths of reachability.).
Changed in version 2.3: Previously, adding'__weakref__' to the__slots__ declarationwould not enable support for weak references.
The WeakKeyDictionary and WeakValueDictionary classes supplied by the weakref module are an alternative,using weak references to construct mappings that don't keep objects alive solely because they appear in the mapping objects.
WeakSet implements the set interface, but keeps weak references to its elements, just like a WeakKeyDictionary does. finalize provides a straight forward way to register a cleanup function to be called when an object is garbage collected.
Most programs should find that using one of these weak container types or finalize is all they need--it's not usually necessary to create your own weak references directly.
WeakKeyDictionary and WeakValueDictionary use weak references in their implementation, setting up callback functions on the weak references that notify the weak dictionaries when a key or value has been reclaimed by garbage collection.
To avoid these issues, references to DOM nodes in foreign document should instead be stored in an object which is specific to that document, and cleaned up when the document is unloaded,or stored as weak references.
If, for example, an image object is a value in a WeakValueDictionary, then when the lastremaining references to that image object are the weak references held by weak mappings, garbage collection can reclaim the object, and its corresponding entries in weak mappings are simply deleted.
LG: Potential lost logger changes due to weak reference in OpenJDKExperimental.
It's clear, therefore, that the weak reference can't be aggregated to the target object.
This would be possible if the weak reference was actually aggregated to the target object.
The weak reference doesn't artificially extend the life of the observer, and yet.
A weak pointer or weak reference to an object, then you hint to the.
However, until the object is actually destroyed the weak reference may return the object even if there are no strong references to it.
Parent-child relationship in this case is a weak reference relationship.
Return a proxy to object which uses a weak reference.