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"
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COPYRIGHT (c) 1999 by eXept Software AG
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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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Registry subclass:#CachingRegistry
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instanceVariableNames:'keptReferences cacheSize'
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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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!CachingRegistry class methodsFor:'documentation'!
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copyright
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"
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COPYRIGHT (c) 1999 by eXept Software AG
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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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!
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documentation
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"
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A CachingRegistry behaves generally like a registry;
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However, it keeps hard references to the last n registered objects,
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preventing them from being garbage collected (and finalized).
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This is useful for resources, which do not cost too much memory,
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but are expensive to allocate - a special canditate of this kind are
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XFonts. With a CachingRegistry, fonts are kept a bit longer alive
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and can therefore often be reused - even if temporarily unreferenced.
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This is kind of experimental.
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[author:]
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Claus Gittinger (cg@exept)
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[see also:]
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[instance variables:]
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keptObjects Collection hard referenced objects
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cacheSize Integer number of hard references
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[class variables:]
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"
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! !
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!CachingRegistry methodsFor:'private'!
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cacheSize:aNumber
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keptReferences := OrderedCollection new:aNumber.
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cacheSize := aNumber.
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! !
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!CachingRegistry methodsFor:'registering objects'!
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register:anObject as:aHandle
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keptReferences removeIdentical:anObject ifAbsent:nil.
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keptReferences addLast:anObject.
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keptReferences size > cacheSize ifTrue:[
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keptReferences removeFirst.
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].
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super register:anObject as:aHandle.
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!
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repairTally
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keptReferences := OrderedCollection new:cacheSize.
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super repairTally.
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!
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unregister:anObject atIndex:index
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keptReferences removeIdentical:anObject ifAbsent:nil.
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super unregister:anObject atIndex:index.
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! !
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!CachingRegistry class methodsFor:'documentation'!
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version
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17711
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^ '$Id: CachingRegistry.st 10447 2009-06-14 13:09:55Z vranyj1 $'
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! !
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