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"
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COPYRIGHT (c) 1992 by Claus Gittinger
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All Rights Reserved
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This software is furnished under a license and may be used
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only in accordance with the terms of that license and with the
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inclusion of the above copyright notice. This software may not
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be provided or otherwise made available to, or used by, any
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other person. No title to or ownership of the software is
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hereby transferred.
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"
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IdentityDictionary subclass:#WeakIdentityDictionary
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instanceVariableNames:''
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classVariableNames:''
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poolDictionaries:''
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category:'System-Support'
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!
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WeakIdentityDictionary comment:'
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COPYRIGHT (c) 1992 by Claus Gittinger
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All Rights Reserved
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$Header: /cvs/stx/stx/libbasic/WeakIdentityDictionary.st,v 1.2 1993-11-08 02:32:38 claus Exp $
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written dec 92 by claus
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'!
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!WeakIdentityDictionary class methodsFor:'documentation'!
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documentation
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"
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this is a special class to support keeping track of dependents without
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keeping the values alive - values simply become nil when no one else
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references it. The original dependency mechanism used a regular Dictionary,
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which usually leads to a lot of garbage beeing kept due to a forgotten
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release. Using a WeakDictionary may be incompatible to ST-80 but is much
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more comfortable.
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"
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! !
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!WeakIdentityDictionary methodsFor:'private'!
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keyContainerOfSize:n
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"return a container for keys and values of size n.
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use WeakArrays here."
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|w|
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w := WeakArray new:n.
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w watcher:self.
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^ w
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! !
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!WeakIdentityDictionary methodsFor:'element disposal'!
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informDispose
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"an element (either key or value) died - rehash"
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| sz "{ Class:SmallInteger }"
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any |
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sz := keyArray size.
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any := false.
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1 to:sz do:[:index |
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(keyArray at:index) isNil ifTrue:[
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(valueArray at:index) notNil ifTrue:[
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valueArray at:index put:nil.
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tally := tally - 1.
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any := true
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]
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]
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].
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any ifTrue:[self rehash]
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! !
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