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[CDO] efficient removing objects from lazy loaded model [message #909581]

Fri, 07 September 2012 11:14

Richard Meyer

Messages: 40
Registered: June 2012

Member

Hy,

Is there a smart way to delete objects (and all his references) in a lazy loaded model?
If I execute the following code the whole model will be loaded.

EcoreUtil.delete(myObject);

Thanks for any advice

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Re: [CDO] efficient removing objects from lazy loaded model [message #909587 is a reply to message #909581]

Fri, 07 September 2012 11:22

Eike Stepper

Messages: 6683
Registered: July 2009

Senior Member

Am 07.09.2012 13:14, schrieb Richard Meyer:
> Hy,
>
> Is there a smart way to delete objects (and all his references) in a lazy loaded model?
If you want to avoid to traverse the entire object graph locally you should use remote queries.
CDOView provides convenient API for this task:

org.eclipse.emf.cdo.view.CDOView.queryXRefs(CDOObject, EReference...)
org.eclipse.emf.cdo.view.CDOView.queryXRefs(Set<CDOObject>, EReference...)
org.eclipse.emf.cdo.view.CDOView.queryXRefsAsync(Set<CDOObject>, EReference...)

You may have to query multiple times.

> If I execute the following code the whole model will be loaded.
>
> EcoreUtil.delete(myObject);
Yes, that one doesn't scale well.

Cheers
/Eike

----
http://www.esc-net.de
http://thegordian.blogspot.com
http://twitter.com/eikestepper

Cheers
/Eike

----
http://www.esc-net.de
http://thegordian.blogspot.com
http://twitter.com/eikestepper

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Re: [CDO] efficient removing objects from lazy loaded model [message #909670 is a reply to message #909581]

Fri, 07 September 2012 14:37

Richard Meyer

Messages: 40
Registered: June 2012

Member

Hy Eike,

Thanks for your response.
This works, but If I delete a complete branch (in my model), I have to check each leaf if it has a reference to an object outside the branch (to remove them).

What would be the "normal way" to delete objects in lazy loaded CDO models?

Thanks for any advice

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Re: [CDO] efficient removing objects from lazy loaded model [message #911331 is a reply to message #909670]

Tue, 11 September 2012 12:07

Eike Stepper

Messages: 6683
Registered: July 2009

Senior Member

Am 07.09.2012 16:37, schrieb Richard Meyer:
> Hy Eike,
>
> Thanks for your response.
> This works, but If I delete a complete branch (in my model), I have to check each leaf if it has a reference to an
> object outside the branch (to remove them).
> What would be the "normal way" to delete objects in lazy loaded CDO models?
Sorry for the late answer. There is currently no mechanism in CDO that directly supports deleting all transitive
incoming cross-references. You may have to query multiple times.

Cheers
/Eike

----
http://www.esc-net.de
http://thegordian.blogspot.com
http://twitter.com/eikestepper

Cheers
/Eike

----
http://www.esc-net.de
http://thegordian.blogspot.com
http://twitter.com/eikestepper

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