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One model + ETL; multiple targets [message #748286]

Mon, 24 October 2011 15:57

Hugo A. Garcia

Messages: 258
Registered: July 2009

Senior Member

Hi

Writing a driver for doing multiple outputs of multiple instances of one
model element type for EGL is documented well in previous post with a
similar title to this post. How would one achieve the same using EGL?

Starting from one model with x number of X elements then generate
multiple models for each X element and persist the new model?
-H

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Re: One model + ETL; multiple targets [message #753593 is a reply to message #748286]

Thu, 27 October 2011 22:04

Horacio Hoyos

Messages: 242
Registered: October 2009
Location: Mexico

Senior Member

Hello,

Quote:

How would one achieve the same using EGL?

I would asume you ment using ETL Wink

.

Quote:

Starting from one model with x number of X elements then generate
multiple models for each X element and persist the new model?

Is the number x dynamic or is it known before hand?

If it is known before hand, I have never tried it, but I think something in the lines of this should work: You can use x number of epsilon.emf.loadModel targets in your launch.xml (or epsilon run configuration) to produce multiple output model files. Give each model a unique name, but give them all the same alias. Something like:

<target name="loadModel1">
    <epsilon.emf.loadModel
        name="model1"
        alias="outputModel"
	modelfile="model1.xmi"
	metamodeluri="http://www.mymetamodel.com"
	read="false"
	store="store"
	/>
</target>
...
<target name="loadModelx">
    <epsilon.emf.loadModel
        name="modelx"
        alias="outputModel"
	modelfile="modelx.xmi"
	metamodeluri="http://www.mymetamodel.com"
	read="false"
	store="store"
	/>
</target>

Then in your ETL rules use outputModel as the from model identifier.

If x is dynamic... Is there an ant expert who can tell us if ant supports loops? If not, you will be required to use epsilon standalone, i.e. call ETL from java. Look at the epsilon standalone example for etl (in the repository or the website) and modify the java code so that invocation of etl is inside a loop. Using my own implementation of epsilon standalone, it is something in the lines of:

URI inputModel = URI.createFileURI(inputModelFile.getRawLocation().toString());
for(i = 0; i < x; i++ {
    URI outputModel = URI.createFileURI("C:/model-gen/model" + i + ".xmi");
    EtlExecutor etlExecutor;
    etlExecutor = new EtlExecutor("pathToETlSource");
    etlExecutor.addSourceModel("inputModel", inputModel,    URI.createURI("metamodelIn"));
    etlExecutor.addTargetModel("model" + i, outputModel,  URI.createURI("metamodelOut"));
    etlExecutor.execute();
}

Greetings,

Horacio

Horacio Hoyos Rodriguez
Kinori Tech
Need professional support for Epsilon, EMF?
Go to: https://kinori.tech

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Re: One model + ETL; multiple targets [message #753875 is a reply to message #753593]

Sat, 29 October 2011 18:16

Antonio Garcia-Dominguez

Messages: 594
Registered: January 2010
Location: Birmingham, UK

Senior Member

Hi,

Ant by itself does not support for loops. However, you could use the <for> Ant task, from Ant Contrib. I haven't tried it, though.

Cheers,
Antonio

[Updated on: Sat, 29 October 2011 18:17]

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Re: One model + ETL; multiple targets [message #754283 is a reply to message #753875]

Tue, 01 November 2011 19:22

Louis Rose

Messages: 440
Registered: July 2009
Location: York, United Kingdom

Senior Member

Hi,

It's also worth noting that ETL rules can create more than one target element. For example:

rule Foo2BarBaz
  transform  s : Input!Foo
  to t1 : FirstOutput!Bar,
     t2 : SecondOutput!Baz {

   // Mappings, for example:
   t1.name = s.name;
   t2.name = s.name;
}

If you want to create different model elements in different models and know the number of target models in advance, this might be a viable option.

Cheers,
Louis.

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Re: One model + ETL; multiple targets [message #1215796 is a reply to message #754283]

Thu, 28 November 2013 07:34

Ethem Arkin

Messages: 1
Registered: September 2010

Junior Member

Is it possible to define two input models for the rule?

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Re: One model + ETL; multiple targets [message #1219619 is a reply to message #1215796]

Thu, 05 December 2013 00:14

Dimitris Kolovos

Messages: 2165
Registered: July 2009
Location: York, UK

Senior Member

Hi,

Each ETL rule can define only one source (from) role. However, it's possible to transform groups of elements from multiple models that match specific patterns using the pattern language of Epsilon (EPL) + ETL. Could you please elaborate a bit more on your use case so that I can provide more specific guidance?

Cheers,
Dimitris

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