author | Claus Gittinger <cg@exept.de> |
Mon, 27 Jan 1997 15:18:48 +0100 | |
changeset 2278 | f4b82ee501cc |
parent 2189 | 618dcdc1cee9 |
child 2414 | 215e58d26a05 |
permissions | -rw-r--r-- |
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" |
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COPYRIGHT (c) 1993 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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Object subclass:#Registry |
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instanceVariableNames:'registeredObjects handleArray tally' |
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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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!Registry class methodsFor:'documentation'! |
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copyright |
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" |
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COPYRIGHT (c) 1993 by Claus Gittinger |
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217 | 25 |
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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29 |
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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||
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documentation |
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" |
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Registries provide an easy interface to using WeakArrays. |
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A class, which wants to be informed of instance-death, can put a created object |
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into a registry. The registry will create a (shallow-)copy of the object, and |
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watch out for death of the original object. When it dies, the copy will |
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be sent a #disposed-message. |
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The trick with the shallow copy is especially nice, you can think of it as |
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being the original object which died. |
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All objects, which keep external resources (such as fileDescriptors, fonts, |
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colormap-entries etc.) should be registered, so that the underlying resource |
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can be freed when the object goes away. |
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Of course, you too can use it to do whatever you need to do in case of the |
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death of an object. |
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Registries use #shallowCopyForFinalization to aquire the copy of the original, |
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this can be redefined in registered classes for faster copying |
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(typically, not all internal state but only some device handles are needed for |
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finalization). I if the to-be-registered object is large, this method may also |
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return a stub (placeHolder) object. (i.e. there is no need for the copy to be |
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of the same class as the original, as long as it implements disposed and frees |
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the relevant OS resources ...) |
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Example uses are found in Form, Color, ExternalStream and Font |
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[author:] |
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Claus Gittinger |
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[see also:] |
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WeakArray WeakIdentityDictionary WeakIdentitySet |
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Font Form Color Cursor ExternalStream |
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" |
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! ! |
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!Registry methodsFor:'accessing'! |
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contents |
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"return the collection of registered objects. |
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Warning: this returns a weak collection." |
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^ registeredObjects |
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"Modified: 16.1.1997 / 16:40:46 / cg" |
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! ! |
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!Registry methodsFor:'dispose handling'! |
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informDispose:someHandle |
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"send a dispose message - this is sent to the phantom, |
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since the original is already gone" |
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someHandle disposed |
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"Modified: 16.1.1997 / 17:23:46 / cg" |
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! |
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update:something with:aParameter from:changedObject |
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"an instance has been destroyed - look which one it was" |
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|phantom |
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dstIdx "{ Class: SmallInteger }" |
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sz "{ Class: SmallInteger }" |
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newObjects newHandles o wasBlocked |
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myHandleArray myRegisteredObjects| |
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something == #ElementExpired ifTrue:[ |
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"/ |
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"/ use local refs, in case I shrink in an interrupt |
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"/ |
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myHandleArray := handleArray. |
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myRegisteredObjects := registeredObjects. |
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sz := myHandleArray size. |
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1 to:sz do:[:index | |
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o := myRegisteredObjects at:index. |
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o notNil ifTrue:[ |
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o == 0 ifTrue:[ |
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myRegisteredObjects at:index put:nil. |
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phantom := myHandleArray at:index. |
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phantom notNil ifTrue:[ |
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myHandleArray at:index put:nil. |
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tally := tally - 1. |
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self informDispose:phantom. |
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] |
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] |
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] |
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]. |
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(sz > 50 and:[tally < (sz // 2)]) ifTrue:[ |
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"/ shrink |
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self resize |
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] |
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] ifFalse:[ |
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something == #earlyRestart ifTrue:[ |
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handleArray notNil ifTrue:[ |
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handleArray atAllPut:nil. |
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] |
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] |
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]. |
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"Created: 15.6.1996 / 15:24:41 / cg" |
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"Modified: 8.1.1997 / 14:05:02 / stefan" |
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"Modified: 16.1.1997 / 18:07:41 / cg" |
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! ! |
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!Registry methodsFor:'enumerating'! |
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do:aBlock |
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"evaluate aBlock for each registered object" |
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registeredObjects notNil ifTrue:[ |
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registeredObjects validElementsDo:aBlock |
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] |
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! ! |
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!Registry methodsFor:'private'! |
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159 |
resize |
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|sz "{ Class: SmallInteger }" |
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dstIndex "{ Class: SmallInteger }" |
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realNewSize "{ Class: SmallInteger }" |
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newObjects newHandles wasBlocked |
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phantom| |
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sz := registeredObjects size. |
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(sz > 50 and:[tally < (sz // 2)]) ifTrue:[ |
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"/ shrink |
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171 |
realNewSize := tally * 3 // 2. |
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newObjects := WeakArray new:realNewSize. |
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newHandles := Array new:realNewSize. |
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175 |
wasBlocked := OperatingSystem blockInterrupts. |
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177 |
dstIndex := 1. |
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1 to:sz do:[:index | |
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(phantom := registeredObjects at:index) notNil ifTrue:[ |
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dstIndex > realNewSize ifTrue:[ |
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'Registry [info]: size given is too small in resize' infoPrintCR. |
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wasBlocked ifFalse:[OperatingSystem unblockInterrupts]. |
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^ self |
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]. |
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newObjects at:dstIndex put:phantom. |
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newHandles at:dstIndex put:(handleArray at:index). |
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dstIndex := dstIndex + 1 |
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] |
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]. |
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registeredObjects removeDependent:self. |
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newObjects addDependent:self. |
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registeredObjects := newObjects. |
194 |
handleArray := newHandles. |
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wasBlocked ifFalse:[OperatingSystem unblockInterrupts]. |
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] |
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"Created: 16.1.1997 / 18:08:00 / cg" |
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"Modified: 27.1.1997 / 15:04:40 / cg" |
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! ! |
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!Registry methodsFor:'registering objects'! |
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register:anObject |
206 |
"register anObject, so that a copy of it gets the disposed message |
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when anObject dies (some time in the future)" |
1 | 208 |
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375 | 209 |
^ self register:anObject as:(anObject shallowCopyForFinalization) |
210 |
! |
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211 |
||
212 |
register:anObject as:aHandle |
|
213 |
"register anObject, so that I later receive informDispose: with aHandle |
|
214 |
(some time in the future)" |
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215 |
||
216 |
|newColl newPhantoms |
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159 | 217 |
size "{ Class: SmallInteger }" |
218 |
index "{ Class: SmallInteger }" |
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p wasBlocked| |
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wasBlocked := OperatingSystem blockInterrupts. |
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registeredObjects size == 0 "isNil" ifTrue:[ |
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registeredObjects := WeakArray new:10. |
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registeredObjects addDependent:self. |
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handleArray := Array basicNew:10. |
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registeredObjects at:1 put:anObject. |
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handleArray at:1 put:aHandle. |
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tally := 1. |
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wasBlocked ifFalse:[OperatingSystem unblockInterrupts]. |
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ObjectMemory addDependent:self. |
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^ self |
1 | 232 |
]. |
233 |
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wasBlocked ifFalse:[ |
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OperatingSystem unblockInterrupts. |
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OperatingSystem blockInterrupts. |
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]. |
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|
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index := registeredObjects identityIndexOf:anObject ifAbsent:0. |
1 | 240 |
index ~~ 0 ifTrue:[ |
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"already registered" |
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242 |
handleArray at:index put:aHandle. |
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('Registry [info]: object (' , (registeredObjects at:index) printString , ' is already registered') infoPrintCR. |
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wasBlocked ifFalse:[OperatingSystem unblockInterrupts]. |
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^ self |
1 | 246 |
]. |
247 |
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wasBlocked ifFalse:[ |
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OperatingSystem unblockInterrupts. |
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OperatingSystem blockInterrupts. |
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251 |
]. |
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252 |
|
2182 | 253 |
"search for a free slot, on the fly look for leftovers (no longer happens)" |
159 | 254 |
index := registeredObjects identityIndexOf:nil startingAt:1. |
255 |
index ~~ 0 ifTrue:[ |
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256 |
"is there a leftover ?" |
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257 |
p := handleArray at:index. |
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258 |
p notNil ifTrue:[ |
2182 | 259 |
'Registry [info]: there should be no leftOvers' infoPrintCR. |
260 |
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261 |
"tell the phantom" |
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262 |
handleArray at:index put:nil. |
2182 | 263 |
tally := tally - 1. |
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264 |
self informDispose:p. |
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p := nil. |
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266 |
]. |
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267 |
registeredObjects at:index put:anObject. |
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268 |
handleArray at:index put:aHandle. |
2182 | 269 |
tally := tally + 1. |
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wasBlocked ifFalse:[OperatingSystem unblockInterrupts]. |
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271 |
^ self |
1 | 272 |
]. |
273 |
||
274 |
"no free slot, add at the end" |
|
275 |
||
159 | 276 |
size := registeredObjects size. |
277 |
index := size + 1. |
|
278 |
newColl := WeakArray new:(size * 2). |
|
279 |
newColl replaceFrom:1 to:size with:registeredObjects. |
|
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280 |
registeredObjects removeDependent:self. |
1 | 281 |
registeredObjects := newColl. |
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282 |
registeredObjects addDependent:self. |
159 | 283 |
registeredObjects at:index put:anObject. |
1 | 284 |
|
359 | 285 |
newPhantoms := Array basicNew:(size * 2). |
375 | 286 |
newPhantoms replaceFrom:1 to:size with:handleArray. |
287 |
handleArray := newPhantoms. |
|
288 |
handleArray at:index put:aHandle. |
|
2182 | 289 |
tally := tally + 1. |
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290 |
|
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291 |
wasBlocked ifFalse:[OperatingSystem unblockInterrupts]. |
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292 |
|
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293 |
"Modified: 7.1.1997 / 16:56:03 / stefan" |
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294 |
"Modified: 27.1.1997 / 15:18:07 / cg" |
1 | 295 |
! |
296 |
||
617 | 297 |
registerChange:anObject |
298 |
"a registered object has changed, create a new phantom" |
|
299 |
||
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300 |
|index wasBlocked| |
617 | 301 |
|
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wasBlocked := OperatingSystem blockInterrupts. |
1467 | 303 |
registeredObjects isNil ifTrue:[ |
304 |
index := 0 |
|
305 |
] ifFalse:[ |
|
306 |
index := registeredObjects identityIndexOf:anObject ifAbsent:0. |
|
307 |
]. |
|
617 | 308 |
index ~~ 0 ifTrue:[ |
1467 | 309 |
handleArray at:index put:anObject shallowCopyForFinalization. |
310 |
] ifFalse:[ |
|
311 |
self register:anObject |
|
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312 |
]. |
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313 |
wasBlocked ifFalse:[OperatingSystem unblockInterrupts]. |
1467 | 314 |
|
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315 |
"Modified: 22.6.1996 / 14:27:52 / cg" |
617 | 316 |
! |
317 |
||
1 | 318 |
unregister:anObject |
319 |
"remove registration of anObject, without telling the phantom; |
|
759
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interest is written with one 'r' (shame on me)
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|
320 |
should be sent, if we are no more interested in destruction of |
1 | 321 |
anObject (i.e. it no longer holds external resources)." |
322 |
||
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323 |
|index wasBlocked| |
1 | 324 |
|
1338 | 325 |
registeredObjects notNil ifTrue:[ |
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326 |
wasBlocked := OperatingSystem blockInterrupts. |
1338 | 327 |
index := registeredObjects identityIndexOf:anObject ifAbsent:0. |
328 |
index ~~ 0 ifTrue:[ |
|
329 |
handleArray at:index put:nil. |
|
2182 | 330 |
registeredObjects at:index put:nil. |
331 |
tally := tally - 1. |
|
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332 |
]. |
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333 |
wasBlocked ifFalse:[OperatingSystem unblockInterrupts]. |
2182 | 334 |
|
335 |
self resize |
|
1 | 336 |
] |
1338 | 337 |
|
2182 | 338 |
"Modified: 16.1.1997 / 18:08:42 / cg" |
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339 |
! |
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|
340 |
|
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341 |
unregisterAllForWhich:aBlock |
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342 |
"remove registration of all entries, for which the argument block |
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343 |
evaluates to true. |
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344 |
should be sent, if we are no more interested in destruction of |
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345 |
a group of objects (i.e. it no longer holds external resources)." |
617 | 346 |
|
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347 |
|n "{ Class: SmallInteger }" |
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348 |
obj wasBlocked| |
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349 |
|
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350 |
registeredObjects notNil ifTrue:[ |
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351 |
wasBlocked := OperatingSystem blockInterrupts. |
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352 |
n := registeredObjects size. |
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353 |
1 to:n do:[:index | |
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354 |
obj := registeredObjects at:index. |
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355 |
(obj notNil and:[obj ~~ 0]) ifTrue:[ |
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356 |
(aBlock value:obj) ifTrue:[ |
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|
357 |
handleArray at:index put:nil. |
2182 | 358 |
registeredObjects at:index put:nil. |
359 |
tally := tally - 1. |
|
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360 |
] |
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361 |
] |
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|
362 |
]. |
2180
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|
363 |
wasBlocked ifFalse:[OperatingSystem unblockInterrupts]. |
2182 | 364 |
self resize |
2180
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365 |
] |
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|
366 |
|
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|
367 |
"Created: 16.1.1997 / 16:39:18 / cg" |
2182 | 368 |
"Modified: 16.1.1997 / 18:08:47 / cg" |
617 | 369 |
! ! |
370 |
||
1961 | 371 |
!Registry class methodsFor:'documentation'! |
630 | 372 |
|
373 |
version |
|
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374 |
^ '$Header: /cvs/stx/stx/libbasic/Registry.st,v 1.39 1997-01-27 14:18:48 cg Exp $' |
630 | 375 |
! ! |