[squeak-dev] ObjectFinalizerTests>>testFinalizationOfEquals
Norbert Hartl
norbert at hartl.name
Sat Jun 14 10:29:08 UTC 2008
While trying to fix some things in pharo I came across a test
I have some problems with understanding (by the way this test has
vanished in 3.10).
testFinalizationOfEquals
"self debug: #testFinalizationOfEquals"
| bag o |
bag := IdentityBag new.
1 to: 5 do: [:n | o := Object new. bag add: n. o toFinalizeSend:
#remove: to: bag with: n].
1 to: 5 do: [:n | o := Object new. bag add: n. o toFinalizeSend:
#remove: to: bag with: n].
o := nil. "<-- Hello Klaus :)"
Smalltalk garbageCollect.
self assert: [ bag isEmpty ].
My problem is that toFinalizeSend:to:with adds an Objectfinalizer
to the finalizationRegistry of the instance. But
Object>>finalizationRegistry
"Answer the finalization registry associated with the receiver."
^WeakRegistry default
returns a global object which is WeakKeyDictionary. And
| d |
d := WeakKeyDictionary new.
d at: (1 asString copy) put: $a.
d at: (1 asString copy) put: $b.
d size
prints 1. To me that would exchange every entry from the first
run by the second run (because the objects are equal).
So I would assume that if there does not happen a run of the
garbagecollector between the two loops the objects of the first
loop should be still contained in the bag. But the test is named
finalizationOfEquals so I have to assume: self doesNotUnderstand
Can someone explain it to me, please?
Norbert
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