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"
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COPYRIGHT (c) 1994 by Claus Gittinger
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187
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All Rights Reserved
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94
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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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IdentitySet subclass:#WeakIdentitySet
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609
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instanceVariableNames:''
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classVariableNames:''
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poolDictionaries:''
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category:'Collections-Unordered'
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94
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!
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!WeakIdentitySet class methodsFor:'documentation'!
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copyright
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"
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COPYRIGHT (c) 1994 by Claus Gittinger
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187
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All Rights Reserved
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94
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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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!
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documentation
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"
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this is a special class to support dependencies which do not
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prevent objects from dying.
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"
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609
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!
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version
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^ '$Header: /cvs/stx/stx/libbasic/WeakIdentitySet.st,v 1.11 1995-11-23 01:26:15 cg Exp $'
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! !
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111
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!WeakIdentitySet class methodsFor:'instance creation'!
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new
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"return a new empty Set"
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^ self new:1
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! !
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609
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!WeakIdentitySet class methodsFor:'queries'!
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goodSizeFrom:arg
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"return a good array size for the given argument.
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Since WeakIdentitySets are mostly used for dependency management, we typically
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have only one element in the set. Therefore use exact size for small sets
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(instead of rounding up to the prime 11)."
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arg <= 10 ifTrue:[
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arg < 1 ifTrue:[^ 1].
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^ arg.
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].
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^ super goodSizeFrom:arg
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! !
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359
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!WeakIdentitySet methodsFor:'adding & removing'!
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add:newElement
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"redefined to avoid synchronization promlems, in case
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of interrupts
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(otherwise, there could be some other operation on the receiver
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done by another process, which garbles my contents)"
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|wasBlocked|
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wasBlocked := OperatingSystem blockInterrupts.
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super add:newElement.
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wasBlocked ifFalse:[OperatingSystem unblockInterrupts]
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!
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remove:anObject ifAbsent:exceptionBlock
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"redefined to avoid synchronization promlems, in case
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of interrupts
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(otherwise, there could be some other operation on the receiver
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done by another process, which garbles my contents)"
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|wasBlocked|
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wasBlocked := OperatingSystem blockInterrupts.
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[
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super remove:anObject ifAbsent:exceptionBlock
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] valueNowOrOnUnwindDo:[
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wasBlocked ifFalse:[OperatingSystem unblockInterrupts]
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]
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! !
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609
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!WeakIdentitySet methodsFor:'element disposal'!
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94
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609
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informDispose
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"an element died - must rehash"
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|wasBlocked|
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111
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609
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"
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must block interrupts here - finalization
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may be done at low prio in the background
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finalizer, we do not want to be interrupted
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while rehashing
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"
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wasBlocked := OperatingSystem blockInterrupts.
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self rehash.
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wasBlocked ifFalse:[OperatingSystem unblockInterrupts].
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94
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! !
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216
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!WeakIdentitySet methodsFor:'enumerating'!
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do:aBlock
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"perform the block for all members in the collection.
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This method has been rewritten to be more robust about
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changed contents while enumerating elements (which might
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happen during change&update processing, if dependents
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are added or removed within the update."
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|index "{ Class: SmallInteger }"
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element|
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index := 1.
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[index <= keyArray size] whileTrue:[
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element := keyArray at:index.
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(element notNil and:[element ~~ DeletedEntry]) ifTrue:[
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aBlock value:element
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].
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index := index + 1
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]
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! !
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609
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!WeakIdentitySet methodsFor:'private'!
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94
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609
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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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359
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609
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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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94
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! !
|
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609
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