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| Re: Trouble with Proxy Resolution [message #423588 is a reply to message #423581] |
Thu, 02 October 2008 15:48   |
Eclipse User |
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Originally posted by: cdamus.zeligsoft.com
Hi, Greg,
When the Bs are resolved, the ResourceSet is ultimately responsible for
resolving them by loading the resources that contain the Bs. Thus, the
Bs should already be contained by resources in the same resource set as
A, but they would never be expected to be in the same *resource* as A
because then they wouldn't have been proxies in the first place.
I think the question is how does proxy resolution yield B instances that
aren't in any resource. They must be in a resource. Does your
application somehow customize the proxy-resolution code in the
ResourceSet (the getEObject(...) method)?
Cheers,
Christian
Greg wrote:
> I am having trouble with proxy resolution. My model doesn't use
> containment relationships, they are all references.
> A hasManyBs
> B hasManyCs
>
> An instance of A is created during resource load and added to the
> resource contents.
>
> When I do "a.hasManyBs.toArray()" the Bs resolve but are not contained
> in the resource.
>
> If I then try to do "b.hasManyCs.toArray()", the proxy resolution seems
> to fail because B does not belong to a resource.
>
> I have tried to add each object to the resource as they are loaded but I
> get exceptions when doing that. I am not sure if this is the correct
> approach or not anyway.
>
> What approach should I use to make this model behave as expected in EMF?
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| Re: Trouble with Proxy Resolution [message #423608 is a reply to message #423602] |
Thu, 02 October 2008 20:26 |
| Eclipse User |
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Originally posted by: cdamus.zeligsoft.com
Hi, Greg,
Your TransactionalEditingDomain will consider this addition of the
object to a resource as a model change, which requires a read/write
transaction. Ordinary proxy resolution is compatible with a read-only
context because it doesn't actually change the "abstract state" of any
EObjects or Resources.
You will need to do one of:
- execute a command with the Transaction.UNPROTECTED option to
add the object to the resource. This option is required in
case the current thread has a read-only transaction in progress,
which is probably likely. Also, you probably don't want this
change to be undoable
- toggle the eDeliver() state of the resource off and on around
the insertion of the object, so that the editing domain doesn't
hear about the change
HTH,
Christian
Greg Fox wrote:
> I tracked it down to the TransactionChangeListener.
>
> IllegalStateException ise = new
> IllegalStateException(Messages.noWriteTx);
>
>
> Here is my method from my ResourceImpl :
> protected EObject getEObjectByID(String id) {
> EObject result = null;
> MMObj obj = MMObj.getInstance(getModelSource().getModel(), ObjId
> .getInstance(Long.valueOf(id)));
>
> // If the MMObj is in a deleted status, then do not continue
> if (obj.getChgStatus() == ChgStatus.DELETED_ITEM) {
> return null;
> } else {
> MetaModelResourceSync synch = ResourceSyncFactory
> .getResourceSyncByOTC(obj.getObjTypeCode());
> if (synch != null) {
> result = (EObject) synch.load(this, obj.getId().getValue());
> this.contents.add(result);
> }
> }
> return result;
> }
>
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