Fix unlikely but possible race in `WeakValueDictionary`
It may happen that value in `valueArray` could have been already
collected by the GC but #clearDeadSlots have not yet been called.
When this happened, `#at:ifAbsentPut:` returned tombstone rather
than updating the dictionary with value from block.
This commit fixes this by checking whether `valueArray` contain
the tombstone and if so, clearing up the dead slots and restarting
the operation. HTH.
"
COPYRIGHT (c) 2016 by eXept Software AG
All Rights Reserved
This software is furnished under a license and may be used
only in accordance with the terms of that license and with the
inclusion of the above copyright notice. This software may not
be provided or otherwise made available to, or used by, any
other person. No title to or ownership of the software is
hereby transferred.
"
"{ Package: 'stx:libbasic' }"
"{ NameSpace: Smalltalk }"
Notification subclass:#UnhandledAttributeInLiteralArrayErrorSignal
instanceVariableNames:'badLiteralArray'
classVariableNames:''
poolDictionaries:''
category:'Kernel-Exceptions-Errors'
!
!UnhandledAttributeInLiteralArrayErrorSignal class methodsFor:'documentation'!
copyright
"
COPYRIGHT (c) 2016 by eXept Software AG
All Rights Reserved
This software is furnished under a license and may be used
only in accordance with the terms of that license and with the
inclusion of the above copyright notice. This software may not
be provided or otherwise made available to, or used by, any
other person. No title to or ownership of the software is
hereby transferred.
"
!
documentation
"
notifying when decoding a literal array spec,
when a non-existing attribute is encountered.
i.e. a spec-element of the form
(Foo attribute: x),
where atribute is unknown to the Foo class (at cannot decode that)
(used to be an errorPrint in basicFromLiteralArrayEncoding).
|spec1 spec2|
UnhandledAttributeInLiteralArrayErrorSignal handle:[:ex |
Transcript showCR:ex description
] do:[
spec1 := #(#UISpecification #activeHelpKey: #foo) decodeAsLiteralArray.
spec2 := #(#UISpecification #blabla: #foo) decodeAsLiteralArray.
].
Transcript showCR:spec1.
Transcript showCR:spec2.
[author:]
cg
"
! !
!UnhandledAttributeInLiteralArrayErrorSignal class methodsFor:'initialization'!
initialize
NotifierString := 'unhandled literalArrayEncoding attribute: '.
"
self handle:[:ex |
Transcript showCR:ex
] do:[
self raiseWith:'bla'
].
"
! !
!UnhandledAttributeInLiteralArrayErrorSignal methodsFor:'accessing'!
badLiteralArray
"the literal array containing the unhandled attribute"
^ badLiteralArray
!
badLiteralArray:something
badLiteralArray := something.
!
unhandledAttribute
"the unhandled attribute"
^ parameter
! !
!UnhandledAttributeInLiteralArrayErrorSignal methodsFor:'printing & storing'!
description
^ super description, ' (', parameter printString,')'
! !
!UnhandledAttributeInLiteralArrayErrorSignal class methodsFor:'documentation'!
version
^ '$Header$'
!
version_CVS
^ '$Header$'
! !
UnhandledAttributeInLiteralArrayErrorSignal initialize!