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Metamodel migration, how to ? [message #535091]

Fri, 21 May 2010 09:36

Sébastien Gandon

Messages: 184
Registered: July 2009

Senior Member

Hello,
I have a big ecore metamodel(myMetaModelv1.ecore) that I refactored by changing a few inheritance and some class attributes and references (myMetaModelv2.ecore).

I am in the process of writing a migration engine for all the models conforming to the old metamodel, so I tought of using some M2M transformation.
I looked at the ATL transformation user guide and it seems that I need to create a copy of all the old model instance into the new model.

My problem is that most of the classes have not been renamed and still have the same attributes, the changes I have made just concern a small amount of classes.
I there any mean such as a ecore transformation/generation that could help me generate the atl script for the copy of the old instance to the new ones automatically ?
Is there another approach to take ?

Thanks for any lead.

SeB.

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Re: Metamodel migration, how to ? [message #535114 is a reply to message #535091]

Fri, 21 May 2010 10:40

Sylvain EVEILLARD

Messages: 556
Registered: July 2009

Senior Member

Have a look here (EModelCopyGenerator.atl).

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Re: Metamodel migration, how to ? [message #535115 is a reply to message #535091]

Fri, 21 May 2010 10:39

Vincent MAHE

Messages: 129
Registered: July 2009

Senior Member

Le 21/05/2010 11:36, seb.fr a écrit :
> Hello, I have a big ecore metamodel(myMetaModelv1.ecore) that I
> refactored by changing a few inheritance and some class attributes and
> references (myMetaModelv2.ecore).
>
> I am in the process of writing a migration engine for all the models
> conforming to the old metamodel, so I tought of using some M2M
> transformation.
> I looked at the ATL transformation user guide and it seems that I need
> to create a copy of all the old model instance into the new model.
> My problem is that most of the classes have not been renamed and still
> have the same attributes, the changes I have made just concern a small
> amount of classes.
> I there any mean such as a ecore transformation/generation that could
> help me generate the atl script for the copy of the old instance to the
> new ones automatically ?
> Is there another approach to take ?
>
> Thanks for any lead.
>
> SeB.

You may use the ATL refining mode:
http://wiki.eclipse.org/ATL/User_Guide_-_Overview_of_the_Atl as_Transformation_Language#Refining_mode_execution_semantics

--
Cordialement

Vincent MAHÉ

Ingénieur Expert - Projet IDM++ - Équipe AtlanMod
École des Mines de Nantes
La Chantrerie - 4, rue Alfred Kastler
B.P. 20722 - F-44307 NANTES Cedex 3
Tel: (33)2 51 85 81 00

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Re: Metamodel migration, how to ? [message #535128 is a reply to message #535115]

Fri, 21 May 2010 11:50

Sébastien Gandon

Messages: 184
Registered: July 2009

Senior Member

I have tried one simple refining transformation which does nothing
------------------------------------------------------------
-- @path MM=/org.talend.model/model/metadata.ecore
-- @path OLDMM=/org.talend.model.transformation/old_models/metadata.e core

module TosMetadata400to410;
create OUT : MM refining IN : OLDMM;
------------------------------------------------------------ ---

and the output gets empty which I understand because I do not know how the mapping would be done between the 2 model classes because althougth the have the same name and belong to the same package and almmost have the same attributes, the package names space URI have been change to reflect the change of version and I am affraid they are considered as completly different models.

How does ATL handle refining from one metamodel to another ?

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Re: Metamodel migration, how to ? [message #535132 is a reply to message #535114]

Fri, 21 May 2010 12:02

Sébastien Gandon

Messages: 184
Registered: July 2009

Senior Member

Sylvain EVEILLARD wrote on Fri, 21 May 2010 06:40

Have a look here (EModelCopyGenerator.atl).

Thank fo the tip, This seems to be what I am looking for althoug I am looking at Atlas Model Weaving also.
But I do not know how to use the given ATL, do you have any lead or tutorial on how to use the query the user guide is not sufficent.
Is there any book I could get have deeper information on ATL ?

Anyway thaks for this quick answer.

SeB.

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Re: Metamodel migration, how to ? [message #535156 is a reply to message #535132]

Fri, 21 May 2010 12:51

Sylvain EVEILLARD

Messages: 556
Registered: July 2009

Senior Member

seb.fr wrote on Fri, 21 May 2010 08:02

Sylvain EVEILLARD wrote on Fri, 21 May 2010 06:40

Have a look here (EModelCopyGenerator.atl).

A query is just a standard transformation but you only add input models. Here the input model is your metamodel conforming to ecore (be sure to use the 'isMetaMetaModel' checkbox).Be careful tho that with ATL v3, the writeTo helper is no longer relative to the workspace but to the eclipse installation folder instead (that is really puzzling I know). So, just use an absolute path.

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