Hi All!
I have object System, it has collection of SubSystems.
When I create new SubSystem, I add it to System's collection.
tx.begin();
System system = getByIdentity( 1, System.class );
Collection subSystems = system.getSubSystems();
subSystems.add( new SubSystem() );
tx.commit();
After saying commit, ALL(!) objects in subSystems collection are
updated. I think it's not good. What can you say about it?
PersistentBorekerImpl:
private void store(Object obj, boolean insert, Map markedForStore)
{
......
storeCollections(
obj,
cld.getCollectionDescriptors(),
markedForStore);
}
storeCollections() iterates over all objects in collection, and stores
all the objects in it. :(
May be the dirty check mentioned below will help?
Thomas Mahler wrote:
>Hi Winson,
>The layerered approach of OJB delegates such optimizations to the high
>level APIs ODMG, JDO and OTM.
>That is on the PersistenceBroker there is no such tracking.
>But on the ODMG and JDO level you have full object level transactions.
>There is some further explanation on this topic in the FAQ.
>The PersistenceBroker provides the notion of an ObjectModification that
> contains hint information if an object needs insert or update.
>So IMO there no need to add anything.
>cheers,
>Thomas
>Winson Quock wrote:
> Hello,
>
> Looks like to me that OJB allows configuration of whether to store a related
> object automatically, but it does not attempt to figure out if the related
> objects are changed, i.e. we need some kind of dirty-flag mechanism, for
> optimization.
>
> I suggest we add an interface "ChangeTrackedObject" like
>
> interface ChangeTrackedObject {
> bool isChanged();
> }
>
> when we store we check if we can:
>
> if (obj instanceof ChangeTrackedObject) {
> if (!((ChangeTrackedObject)obj).isChanged()) {
> // no change
> return;
> }
> }
>
> The data object is responsible for tracking the changes.
>
> What do you think?
>
Best regards,
Andrey Chernyh<[EMAIL PROTECTED]>
Plesk Inc.
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