author | Stefan Vogel <sv@exept.de> |
Tue, 03 Jun 2014 07:07:03 +0200 | |
changeset 16513 | 569bc0abc98d |
parent 16244 | 584d9f48f6c1 |
child 18120 | e3a375d5f6a8 |
child 18333 | 854cf4f00536 |
permissions | -rw-r--r-- |
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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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"{ Package: 'stx:libbasic' }" |
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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:'Collections-Weak' |
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! |
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||
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!WeakIdentityDictionary class methodsFor:'documentation'! |
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copyright |
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" |
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COPYRIGHT (c) 1992 by Claus Gittinger |
|
358 | 26 |
All Rights Reserved |
88 | 27 |
|
28 |
This software is furnished under a license and may be used |
|
29 |
only in accordance with the terms of that license and with the |
|
30 |
inclusion of the above copyright notice. This software may not |
|
31 |
be provided or otherwise made available to, or used by, any |
|
32 |
other person. No title to or ownership of the software is |
|
33 |
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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1263 | 39 |
WeakIdentityDictionaries behave like IdentityDictionaries, |
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as long as the keys are still referenced by some |
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other (non-weak) object. |
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However, once the last non-weak reference ceases to exist, |
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the object will be automatically removed from the Weakcollection |
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(with some delay: it will be removed after the next garbage collect). |
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||
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This class was added 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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49 |
which usually leads to a lot of garbage being 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, since no manual release of dependents is needed. |
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|
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[Warning:] |
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If you use this, be very careful since the collections size changes |
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'magically' - for example, testing for being nonEmpty and then |
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removing the first element may fail, since the element may vanish inbetween. |
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In general, never trust the value as returned by the size/isEmpty messages. |
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||
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[author:] |
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Claus Gittinger |
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|
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[See also:] |
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WeakArray WeakValueDictionary WeakIdentitySet |
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" |
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! ! |
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||
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!WeakIdentityDictionary methodsFor:'adding & removing'! |
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||
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at:key ifAbsent:exceptionBlock |
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"redefined to block interrupts |
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(avoid change of the dictionary while accessing)" |
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|val| |
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(OperatingSystem blockInterrupts) ifTrue:[ |
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#valueNowOrOnUnwindDo: -> #ensure:
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"/ already blocked |
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#valueNowOrOnUnwindDo: -> #ensure:
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^ super at:key ifAbsent:exceptionBlock. |
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]. |
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[ |
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val := super at:key ifAbsent:exceptionBlock. |
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#valueNowOrOnUnwindDo: -> #ensure:
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] ensure:[ |
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#valueNowOrOnUnwindDo: -> #ensure:
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OperatingSystem unblockInterrupts. |
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]. |
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^ val |
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||
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"Modified: 6.5.1996 / 12:22:26 / stefan" |
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"Modified: 1.7.1997 / 10:45:47 / cg" |
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! |
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||
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at:key put:anObject |
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"add the argument anObject under key, aKey to the receiver. |
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Return anObject (sigh). |
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Redefined to block interrupts, to avoid trouble when dependencies |
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are added within interrupting high prio processes." |
97 |
||
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|val| |
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|
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(OperatingSystem blockInterrupts) ifTrue:[ |
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"/ already blocked |
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^ super at:key put:anObject. |
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]. |
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[ |
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val := super at:key put:anObject. |
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] ensure:[ |
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#valueNowOrOnUnwindDo: -> #ensure:
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OperatingSystem unblockInterrupts. |
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]. |
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^ val |
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parents:
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"Modified: 6.5.1996 / 12:22:26 / stefan" |
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parents:
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"Modified: 29.1.1997 / 15:08:45 / cg" |
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! |
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116 |
removeKey:aKey ifAbsent:aBlock |
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"remove the association under aKey from the collection, |
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return the value previously stored there. |
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If it was not in the collection return the result |
120 |
from evaluating aBlock. |
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||
122 |
Redefined to avoid synchronization problems, in case |
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of interrupts (otherwise, there could be some other operation |
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on the receiver done by another process, which garbles my contents)." |
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|ret| |
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|
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(OperatingSystem blockInterrupts) ifTrue:[ |
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"/ already blocked |
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^ super removeKey:aKey ifAbsent:aBlock. |
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]. |
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|
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[ |
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ret := super removeKey:aKey ifAbsent:aBlock |
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] ensure:[ |
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OperatingSystem unblockInterrupts |
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]. |
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parents:
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^ ret |
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|
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parents:
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"Modified: 6.5.1996 / 12:44:51 / stefan" |
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"Modified: 29.1.1997 / 15:09:11 / cg" |
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! |
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|
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safeRemoveKey:key |
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"redefined to block interrupts |
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(avoid change of the dictionary while accessing)" |
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|
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|val| |
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(OperatingSystem blockInterrupts) ifTrue:[ |
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"/ already blocked |
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^ super safeRemoveKey:key. |
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]. |
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|
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[ |
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val := super safeRemoveKey:key. |
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] ensure:[ |
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158 |
OperatingSystem unblockInterrupts. |
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]. |
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^ val |
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|
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"Modified: 6.5.1996 / 12:22:26 / stefan" |
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163 |
"Modified: 1.7.1997 / 10:45:52 / cg" |
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164 |
"Created: 1.7.1997 / 10:46:34 / cg" |
359 | 165 |
! ! |
166 |
||
10 | 167 |
!WeakIdentityDictionary methodsFor:'element disposal'! |
168 |
||
6309 | 169 |
clearDeadSlots |
170 |
|wasBlocked| |
|
171 |
||
172 |
" |
|
173 |
have to block here - dispose may be done at a low priority |
|
174 |
from the background finalizer. If new items are added by a |
|
175 |
higher prio process, the dictionary might get corrupted otherwise |
|
176 |
" |
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177 |
wasBlocked := OperatingSystem blockInterrupts. |
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6469 | 178 |
[ |
179 |
keyArray |
|
180 |
forAllDeadIndicesDo:[:idx | |
|
181 |
valueArray basicAt:idx put:nil. |
|
182 |
tally := tally - 1. |
|
183 |
] |
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184 |
replacingCorpsesWith:DeletedEntry. |
|
185 |
] ensure:[ |
|
186 |
wasBlocked ifFalse:[OperatingSystem unblockInterrupts]. |
|
187 |
]. |
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|
189 |
"Modified: / 13.12.2001 / 14:18:17 / martin" |
|
190 |
! |
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191 |
||
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192 |
update:something with:aParameter from:changedObject |
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193 |
"an element (either key or value) died - clear out slots for |
f19df2d4c238
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|
194 |
disposed keys." |
6 | 195 |
|
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196 |
something == #ElementExpired ifTrue:[ |
6309 | 197 |
self clearDeadSlots. |
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198 |
] |
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199 |
|
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"Created: / 7.1.1997 / 16:59:30 / stefan" |
201 |
"Modified: / 13.12.2001 / 14:17:58 / martin" |
|
6 | 202 |
! ! |
609 | 203 |
|
204 |
!WeakIdentityDictionary methodsFor:'private'! |
|
205 |
||
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206 |
findKeyOrNil:key |
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|
207 |
"Look for the key in the receiver. |
2988 | 208 |
If it is found, return the index, |
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209 |
otherwise the index of the first unused slot. |
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210 |
Grow the receiver, if key was not found, and no unused slots were present. |
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|
211 |
|
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|
212 |
Warning: an empty slot MUST be filled by the sender - it is only to be sent |
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by at:put: / add: - like methods." |
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|
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|
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|
215 |
|index "{ Class:SmallInteger }" |
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|
216 |
length "{ Class:SmallInteger }" |
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|
217 |
startIndex probe |
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218 |
delIndex "{ Class:SmallInteger }"| |
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219 |
|
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220 |
(OperatingSystem blockInterrupts) ifFalse:[ |
2988 | 221 |
"/ |
222 |
"/ may never be entered with interrupts enabled |
|
223 |
"/ |
|
224 |
OperatingSystem unblockInterrupts. |
|
8493 | 225 |
self error:'unblocked call of findKeyOrNil'. |
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|
226 |
]. |
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|
227 |
|
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228 |
delIndex := 0. |
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229 |
|
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230 |
length := keyArray basicSize. |
6953
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231 |
startIndex := index := self initialIndexForKey:key. |
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|
232 |
|
16244 | 233 |
[ |
2988 | 234 |
probe := keyArray basicAt:index. |
235 |
key == probe ifTrue:[^ index]. |
|
236 |
probe isNil ifTrue:[ |
|
237 |
delIndex == 0 ifTrue:[^ index]. |
|
238 |
keyArray basicAt:delIndex put:nil. |
|
239 |
^ delIndex |
|
240 |
]. |
|
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|
241 |
|
2988 | 242 |
probe == 0 ifTrue:[ |
243 |
probe := DeletedEntry. |
|
244 |
keyArray basicAt:index put:probe. |
|
245 |
valueArray basicAt:index put:nil. |
|
246 |
tally := tally - 1. |
|
247 |
]. |
|
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|
248 |
|
2988 | 249 |
delIndex == 0 ifTrue:[ |
250 |
probe == DeletedEntry ifTrue:[ |
|
251 |
delIndex := index |
|
252 |
] |
|
253 |
]. |
|
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|
254 |
|
2988 | 255 |
index == length ifTrue:[ |
256 |
index := 1 |
|
257 |
] ifFalse:[ |
|
258 |
index := index + 1 |
|
259 |
]. |
|
260 |
index == startIndex ifTrue:[ |
|
261 |
delIndex ~~ 0 ifTrue:[ |
|
262 |
keyArray basicAt:delIndex put:nil. |
|
263 |
^ delIndex |
|
264 |
]. |
|
265 |
^ self grow findKeyOrNil:key |
|
266 |
]. |
|
16244 | 267 |
] loop. |
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268 |
|
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|
269 |
"Modified: 30.1.1997 / 15:04:34 / cg" |
2988 | 270 |
"Modified: 1.10.1997 / 11:25:32 / stefan" |
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271 |
! |
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272 |
|
2298 | 273 |
grow:newSize |
274 |
"grow the receiver. |
|
275 |
Redefined to block interrupts, to avoid trouble when dependencies |
|
276 |
are added within interrupting high prio processes." |
|
277 |
||
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278 |
"/ 'grow:' printCR. |
2298 | 279 |
|
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280 |
(OperatingSystem blockInterrupts) ifTrue:[ |
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|
281 |
"/ already blocked |
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282 |
^ super grow:newSize. |
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283 |
]. |
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284 |
|
2298 | 285 |
[ |
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286 |
super grow:newSize |
58dca33cf0fc
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|
287 |
] ensure:[ |
58dca33cf0fc
#valueNowOrOnUnwindDo: -> #ensure:
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288 |
OperatingSystem unblockInterrupts |
2298 | 289 |
]. |
290 |
||
291 |
"Created: 28.1.1997 / 23:41:39 / cg" |
|
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292 |
"Modified: 29.1.1997 / 15:10:12 / cg" |
2298 | 293 |
! |
294 |
||
609 | 295 |
keyContainerOfSize:n |
296 |
"return a container for keys of size n. |
|
2298 | 297 |
use WeakArrays here, but dont make me a depenent of it." |
609 | 298 |
|
299 |
|w| |
|
300 |
||
301 |
w := WeakArray new:n. |
|
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|
302 |
w addDependent:self. |
609 | 303 |
^ w |
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|
304 |
|
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parents:
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changeset
|
305 |
"Modified: 7.1.1997 / 17:01:15 / stefan" |
2298 | 306 |
"Modified: 29.1.1997 / 14:18:49 / cg" |
307 |
! |
|
308 |
||
309 |
rehash |
|
310 |
"grow the receiver. |
|
311 |
Redefined to block interrupts, to avoid trouble when dependencies |
|
312 |
are added within interrupting high prio processes." |
|
313 |
||
314 |
"/ 'rehash' printCR. |
|
315 |
||
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parents:
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diff
changeset
|
316 |
(OperatingSystem blockInterrupts) ifTrue:[ |
6421
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parents:
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changeset
|
317 |
"/ already blocked |
8493 | 318 |
super rehash. |
319 |
^ self. |
|
2303
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parents:
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diff
changeset
|
320 |
]. |
f19df2d4c238
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parents:
2298
diff
changeset
|
321 |
|
2298 | 322 |
[ |
6421
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#valueNowOrOnUnwindDo: -> #ensure:
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parents:
6309
diff
changeset
|
323 |
super rehash |
58dca33cf0fc
#valueNowOrOnUnwindDo: -> #ensure:
Claus Gittinger <cg@exept.de>
parents:
6309
diff
changeset
|
324 |
] ensure:[ |
58dca33cf0fc
#valueNowOrOnUnwindDo: -> #ensure:
Claus Gittinger <cg@exept.de>
parents:
6309
diff
changeset
|
325 |
OperatingSystem unblockInterrupts |
2298 | 326 |
]. |
327 |
||
328 |
"Created: 29.1.1997 / 11:39:42 / cg" |
|
329 |
"Modified: 29.1.1997 / 14:18:52 / cg" |
|
330 |
! |
|
331 |
||
332 |
setTally:count |
|
333 |
"grow the receiver. |
|
334 |
Redefined to block interrupts, to avoid trouble when dependencies |
|
335 |
are added within interrupting high prio processes." |
|
336 |
||
2303
f19df2d4c238
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Claus Gittinger <cg@exept.de>
parents:
2298
diff
changeset
|
337 |
"/ 'setTally:' printCR. |
2298 | 338 |
|
2303
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avoid creation of a blocks if possible - if not, cheap ones are now created
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parents:
2298
diff
changeset
|
339 |
(OperatingSystem blockInterrupts) ifTrue:[ |
6421
58dca33cf0fc
#valueNowOrOnUnwindDo: -> #ensure:
Claus Gittinger <cg@exept.de>
parents:
6309
diff
changeset
|
340 |
"/ already blocked |
8493 | 341 |
super setTally:count. |
342 |
^ self. |
|
2303
f19df2d4c238
avoid creation of a blocks if possible - if not, cheap ones are now created
Claus Gittinger <cg@exept.de>
parents:
2298
diff
changeset
|
343 |
]. |
f19df2d4c238
avoid creation of a blocks if possible - if not, cheap ones are now created
Claus Gittinger <cg@exept.de>
parents:
2298
diff
changeset
|
344 |
|
2298 | 345 |
[ |
6421
58dca33cf0fc
#valueNowOrOnUnwindDo: -> #ensure:
Claus Gittinger <cg@exept.de>
parents:
6309
diff
changeset
|
346 |
super setTally:count |
58dca33cf0fc
#valueNowOrOnUnwindDo: -> #ensure:
Claus Gittinger <cg@exept.de>
parents:
6309
diff
changeset
|
347 |
] ensure:[ |
58dca33cf0fc
#valueNowOrOnUnwindDo: -> #ensure:
Claus Gittinger <cg@exept.de>
parents:
6309
diff
changeset
|
348 |
OperatingSystem unblockInterrupts |
2298 | 349 |
]. |
350 |
||
351 |
"Created: 29.1.1997 / 11:40:12 / cg" |
|
2303
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avoid creation of a blocks if possible - if not, cheap ones are now created
Claus Gittinger <cg@exept.de>
parents:
2298
diff
changeset
|
352 |
"Modified: 29.1.1997 / 15:11:11 / cg" |
609 | 353 |
! ! |
354 |
||
2741 | 355 |
!WeakIdentityDictionary methodsFor:'testing'! |
356 |
||
357 |
includes:anObject |
|
358 |
"redefined to block interrupts |
|
359 |
(avoid change of the dictionary while accessing)" |
|
360 |
||
361 |
|val| |
|
362 |
||
363 |
(OperatingSystem blockInterrupts) ifTrue:[ |
|
6421
58dca33cf0fc
#valueNowOrOnUnwindDo: -> #ensure:
Claus Gittinger <cg@exept.de>
parents:
6309
diff
changeset
|
364 |
"/ already blocked |
58dca33cf0fc
#valueNowOrOnUnwindDo: -> #ensure:
Claus Gittinger <cg@exept.de>
parents:
6309
diff
changeset
|
365 |
^ super includes:anObject. |
2741 | 366 |
]. |
367 |
||
368 |
[ |
|
6421
58dca33cf0fc
#valueNowOrOnUnwindDo: -> #ensure:
Claus Gittinger <cg@exept.de>
parents:
6309
diff
changeset
|
369 |
val := super includes:anObject. |
58dca33cf0fc
#valueNowOrOnUnwindDo: -> #ensure:
Claus Gittinger <cg@exept.de>
parents:
6309
diff
changeset
|
370 |
] ensure:[ |
58dca33cf0fc
#valueNowOrOnUnwindDo: -> #ensure:
Claus Gittinger <cg@exept.de>
parents:
6309
diff
changeset
|
371 |
OperatingSystem unblockInterrupts. |
2741 | 372 |
]. |
373 |
^ val |
|
374 |
||
375 |
"Modified: 6.5.1996 / 12:22:26 / stefan" |
|
376 |
"Modified: 1.7.1997 / 10:45:52 / cg" |
|
377 |
"Created: 1.7.1997 / 10:47:13 / cg" |
|
378 |
! |
|
379 |
||
380 |
includesKey:key |
|
381 |
"redefined to block interrupts |
|
382 |
(avoid change of the dictionary while accessing)" |
|
383 |
||
384 |
|val| |
|
385 |
||
386 |
(OperatingSystem blockInterrupts) ifTrue:[ |
|
6421
58dca33cf0fc
#valueNowOrOnUnwindDo: -> #ensure:
Claus Gittinger <cg@exept.de>
parents:
6309
diff
changeset
|
387 |
"/ already blocked |
58dca33cf0fc
#valueNowOrOnUnwindDo: -> #ensure:
Claus Gittinger <cg@exept.de>
parents:
6309
diff
changeset
|
388 |
^ super includesKey:key. |
2741 | 389 |
]. |
390 |
||
391 |
[ |
|
6421
58dca33cf0fc
#valueNowOrOnUnwindDo: -> #ensure:
Claus Gittinger <cg@exept.de>
parents:
6309
diff
changeset
|
392 |
val := super includesKey:key. |
58dca33cf0fc
#valueNowOrOnUnwindDo: -> #ensure:
Claus Gittinger <cg@exept.de>
parents:
6309
diff
changeset
|
393 |
] ensure:[ |
58dca33cf0fc
#valueNowOrOnUnwindDo: -> #ensure:
Claus Gittinger <cg@exept.de>
parents:
6309
diff
changeset
|
394 |
OperatingSystem unblockInterrupts. |
2741 | 395 |
]. |
396 |
^ val |
|
397 |
||
398 |
"Modified: 6.5.1996 / 12:22:26 / stefan" |
|
399 |
"Created: 1.7.1997 / 10:45:14 / cg" |
|
400 |
"Modified: 1.7.1997 / 10:45:52 / cg" |
|
9243 | 401 |
! |
402 |
||
403 |
isWeakCollection |
|
404 |
"return true, if the receiver has weak references to its elements." |
|
405 |
||
406 |
^ true |
|
2741 | 407 |
! ! |
408 |
||
635 | 409 |
!WeakIdentityDictionary class methodsFor:'documentation'! |
410 |
||
411 |
version |
|
16513 | 412 |
^ '$Header: /cvs/stx/stx/libbasic/WeakIdentityDictionary.st,v 1.45 2014-06-03 05:07:03 stefan Exp $' |
635 | 413 |
! ! |
16244 | 414 |