Yes, adding it to the weak registry does the trick! Thank you Esteban for the pointer and Torsten for the magic line of code WeakRegistry default add: anObject.
Being able to hook into the GC in this way is extremely cool, it saves me a lot of housekeeping work and I am very happy because of that ! > On Jan 13, 2015, at 17:35, Torsten Bergmann <asta...@gmx.de> wrote: > > Esteban wrote: >> you also need to register the object for cleanup, in the WeakRegistry. >> (not on my machine, sorry I cannot put an example, but look around) > > It is simple and here is an example: > > > Create a class: > > Object subclass: #Bar > instanceVariableNames: 'id' > classVariableNames: '' > category: 'Foo' > > implemented an #initialize method > > initialize > super initialize. > id := UUID new. > Transcript show: 'Initialized ', id printString; cr > > and implemented a finalization method: > > finalize > > Transcript show: 'Finalized ', id printString; cr > > Now in the workspace I instantiate the object: > > |anObject| > Transcript open; clear. > anObject := Bar new. > Transcript flush. > WeakRegistry default add: anObject. > > and by forcing garbage collection in a second step I can > see that the finalization method is working: > > 3 timesRepeat: [ Smalltalk garbageCollect ]. > Transcript flush. > > > And I get the following output > > Initialized 4aa47ef1-0e4c-9a47-bddf-b406ee2042e4 > Finalized 4aa47ef1-0e4c-9a47-bddf-b406ee2042e4 > > If it doesnt work check your VM for updates. > > I'm using Pharo4.0 Latest update: #40442 on Windows with the following VM: > Win32 built on Sep 4 2014 01:13:32 Compiler: 4.6.2 VMMaker versionString > https://github.com/pharo-project/pharo-vm.git > Commit: c7bc23dd6053d5f9934f7dd427537f76fc96eb32 Jenkins build #14851 > ---> Save our in-boxes! http://emailcharter.org <--- Johan Fabry - http://pleiad.cl/~jfabry PLEIAD lab - Computer Science Department (DCC) - University of Chile
