"
 COPYRIGHT (c) 2006 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:libbasic2' }"

Collection subclass:#SharedCollection
	instanceVariableNames:'accessLock realCollection'
	classVariableNames:''
	poolDictionaries:''
	category:'Collections-Unordered'
!

!SharedCollection class methodsFor:'documentation'!

copyright
"
 COPYRIGHT (c) 2006 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
"
    Instances of this class provide synchronized access (of multiple processes) 
    to a collection.
"
!

examples
"
                                        [exBegin]
        |c|

        c := SharedCollection for:(OrderedCollection new).
        c add:1.
        c add:2.
        c add:3.
        c addAll:#(4 5 6).
        c removeFirst.
        c removeLast.
        c inspect.
                                        [exEnd]

                                        [exBegin]
        |c|

        c := SharedCollection for:(Array new:10).
        c at:1 put:5.
        c replaceFrom:2 to:5 with:#(20 30 40 50).
        c inspect.
                                        [exEnd]
"
! !

!SharedCollection class methodsFor:'instance creation'!

for:aCollection
    ^ self new initializeFor:aCollection
! !

!SharedCollection methodsFor:'initialization'!

initializeFor:aCollection
    accessLock := RecursionLock new.
    realCollection := aCollection.
! !

!SharedCollection methodsFor:'message forwarding'!

at:index
    |rslt|

    accessLock critical:[
        rslt := realCollection at:index
    ].
    ^ rslt
!

at:index put:value
    |rslt|

    accessLock critical:[
        rslt := realCollection at:index put:value
    ].
    ^ rslt
!

doesNotUnderstand:aMessage
    "catches everything not understood by the collection protocol"

    |msg rslt|

    msg := thisContext sender message.
    accessLock critical:[
        rslt := aMessage sendTo:realCollection
    ].
    ^ rslt
!

subclassResponsibility
    "catches every required message of the collection protocol"

    |msg rslt|

    msg := thisContext sender message.
    accessLock critical:[
        rslt := msg sendTo:realCollection
    ].
    ^ rslt
! !

!SharedCollection class methodsFor:'documentation'!

version
    ^ '$Header: /cvs/stx/stx/libbasic2/SharedCollection.st,v 1.1 2006-05-08 13:09:23 cg Exp $'
! !