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From Leandro Rodrigo Saad Cruz <lean...@ibnetwork.com.br>
Subject Re: [RFC] Defensive copies on store/delete
Date Thu, 17 Apr 2003 21:36:09 GMT
singlewm.PBImpl

[delete|retrive]Collections and References

On Thu, 2003-04-17 at 17:48, Jakob Braeuchi wrote:
> hi leandro,
> 
> where do you make these copies ?
> 
> jakob
> 
> Leandro Rodrigo Saad Cruz wrote:
> 
> >Hi all.
> >
> >I'm trying to build a generic PersistenceManager using OJB and have
> >thise issues !
> >
> >CONTEXT :
> >
> >I want my business object to be independent of the persistence api used,
> >instead, I want them to implement BusinessObject that has the following
> >methods :
> >
> >before/afterXXX() {Update,Add,Remove,Lookup}
> >
> >On this methods I can implement particular business logic
> >(saving/removing files, adding/removing object from lists, etc).
> >
> >PROBLEM :
> >
> >If I want to change a collection that OJB is using on 
> >
> >deleteReferences()
> >storeReferences()
> >deleteCollections()
> >storeCollections()
> >
> >I get a java.util.ConcurrentModificationException
> >because OJB is using a Iterator on the same collection I'm trying to
> >modify ! To SOLVE this problem I have to make OJB use defensive copies
> >of collections before iterating through them !
> >
> >I can't think of any problem that this change should rise besides
> >performance ones.
> >
> >I made a simple modification on deleteCollections and all tests (the
> >ones that were passing) still pass !
> >
> >If there are no objections I'll implement this !
> >
> >Maybe a flag on reference/collection descriptors to indicate that a
> >defensive copy should be used is fine !
> >
> >Any comments ??
> >
> >
> >
> >  
> >
> 
> 
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> 
-- 
Leandro Rodrigo Saad Cruz
IT - Inter Business Tecnologia e Servicos (IB)
http://www.ibnetwork.com.br
http://jakarta.apache.org/ojb


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