Home » Modeling » EMF » [CDO] volatile and derived feature
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| Re: [CDO] volatile and derived feature [message #545238 is a reply to message #545220] |
Wed, 07 July 2010 09:46   |
Eclipse User |
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Originally posted by: ralf.ellner.cs.fau.de
Nils,
> I have an Ecode model with classes with some volatile and derived
> features. Without CDO I would
> set the feature delegation method to 'none' and would override the
> generated getter methods. But since I am using CDO, which
> requires 'reflective' feature delegation method this doesn't work.
>
> Where is the correct place to compute the value of the derived feature?
if you are using EMF 2.5+ you could set feature delegation to 'dynamic'
and implement the generated getter methods. See note at the bottom of
http://wiki.eclipse.org/Preparing_EMF_Models_for_CDO
Best regards, Ralf
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| Re: [CDO] volatile and derived feature [message #545250 is a reply to message #545220] |
Wed, 07 July 2010 09:53 |
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Hi Nils,
Derived features should be declared transient so that they don't get stored somewhere. It may be the case that the EMF generator generates reflective delegation code into the getters for transient features, but you can just replace that code with your computation.
Cheers
/Eike
Contact: http://www.esc-net.de Blogger <http://thegordian.blogspot.com>Twitter <http://twitter.com/eikestepper>Linkedin <http://de.linkedin.com/in/eikestepper>Xing <http://www.xing.com/profile/Eike_Stepper>
Article: What exactly is inside that p2 repository? < http://thegordian.blogspot.com/2010/05/what-exactly-is-insid e-that-p2.html>
Am 07.07.2010 10:53, schrieb Nils Israel:
> Hi,
>
> I have an Ecode model with classes with some volatile and derived features. Without CDO I would
> set the feature delegation method to 'none' and would override the generated getter methods. But since I am using CDO, which
> requires 'reflective' feature delegation method this doesn't work.
>
> Where is the correct place to compute the value of the derived feature?
>
> Best regards,
> Nils Israel
>
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Hi Nils,<br>
<br>
Derived features should be declared transient so that they don't get
stored
<meta content="text/html; charset=ISO-8859-15"
http-equiv="Content-Type">
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somewhere. It may be the case that the EMF generator generates
reflective delegation code into the getters for transient features,
but you can just replace that code with your computation.<br>
<br>
<!--WISESTAMP_SIG_75665_START--><span style="color: black;">
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<div>Cheers
<br>
/Eike
<br>
<br>
</div>
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<div style="color: gray; font-size: 13.3px; padding-bottom:
5px;">Article: <span style="color: blue; text-decoration:
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undefined="">What exactly is inside that p2 repository?</a></span></div>
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<br>
Am 07.07.2010 10:53, schrieb Nils Israel:
<blockquote cite="mid:i11fah$qio$1@build.eclipse.org" type="cite">Hi,
<br>
<br>
I have an Ecode model with classes with some volatile and derived
features. Without CDO I would
<br>
set the feature delegation method to 'none' and would override the
generated getter methods. But since I am using CDO, which
<br>
requires 'reflective' feature delegation method this doesn't work.
<br>
<br>
Where is the correct place to compute the value of the derived
feature?
<br>
<br>
Best regards,
<br>
Nils Israel
<br>
<br>
</blockquote>
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Cheers
/Eike
----
http://www.esc-net.de
http://thegordian.blogspot.com
http://twitter.com/eikestepper
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| Re: [CDO] volatile and derived feature [message #545251 is a reply to message #545238] |
Wed, 07 July 2010 09:56 |
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Hi Ralf,
You're generally right about the dynamic feature delegation, but I suspect (and hope) that Nils really wants to replace the whole getter logic without persisting anything for the derived features.
Cheers
/Eike
Contact: http://www.esc-net.de Blogger <http://thegordian.blogspot.com>Twitter <http://twitter.com/eikestepper>Linkedin <http://de.linkedin.com/in/eikestepper>Xing <http://www.xing.com/profile/Eike_Stepper>
Article: What exactly is inside that p2 repository? < http://thegordian.blogspot.com/2010/05/what-exactly-is-insid e-that-p2.html>
Am 07.07.2010 11:46, schrieb Ralf Ellner:
> Nils,
>
>> I have an Ecode model with classes with some volatile and derived
>> features. Without CDO I would
>> set the feature delegation method to 'none' and would override the
>> generated getter methods. But since I am using CDO, which
>> requires 'reflective' feature delegation method this doesn't work.
>>
>> Where is the correct place to compute the value of the derived feature?
> if you are using EMF 2.5+ you could set feature delegation to 'dynamic'
> and implement the generated getter methods. See note at the bottom of
> http://wiki.eclipse.org/Preparing_EMF_Models_for_CDO
>
> Best regards, Ralf
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Hi Ralf,<br>
<br>
You're generally right
<meta content="text/html; charset=ISO-8859-15"
http-equiv="Content-Type">
about the dynamic feature delegation, but I suspect (and hope) that
Nils really wants to replace the whole getter logic without
persisting anything for the derived features.<br>
<br>
Cheers
<br>
<span style="color: black;">
<div dir="ltr">
<div>/Eike
<br>
<br>
</div>
<div style="padding: 5px 0pt; font-family: arial,sans-serif;
font-size: 13.3px;"><span style="color: gray;">Contact: <a
href="http://www.esc-net.de">http://www.esc-net.de</a></span>
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<div style="color: gray; font-size: 13.3px; padding-bottom:
5px;">Article: <span style="color: blue; text-decoration:
underline;"><a
href=" http://thegordian.blogspot.com/2010/05/what-exactly-is-insid e-that-p2.html"
undefined="">What exactly is inside that p2 repository?</a></span></div>
</div>
</span><!--WISESTAMP_SIG_70323_END--><br>
<br>
Am 07.07.2010 11:46, schrieb Ralf Ellner:
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<br>
<!--WISESTAMP_SIG_70323_START--><span style="color: black;">
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</span><br>
<blockquote cite="mid:i11ide$pua$1@build.eclipse.org" type="cite">
<pre wrap="">Nils,
</pre>
<blockquote type="cite">
<pre wrap="">I have an Ecode model with classes with some volatile and derived
features. Without CDO I would
set the feature delegation method to 'none' and would override the
generated getter methods. But since I am using CDO, which
requires 'reflective' feature delegation method this doesn't work.
Where is the correct place to compute the value of the derived feature?
</pre>
</blockquote>
<pre wrap="">
if you are using EMF 2.5+ you could set feature delegation to 'dynamic'
and implement the generated getter methods. See note at the bottom of
<a class="moz-txt-link-freetext" href="http://wiki.eclipse.org/Preparing_EMF_Models_for_CDO">http://wiki.eclipse.org/Preparing_EMF_Models_for_CDO</a>.
Best regards, Ralf
</pre>
</blockquote>
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Cheers
/Eike
----
http://www.esc-net.de
http://thegordian.blogspot.com
http://twitter.com/eikestepper
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| Re: [CDO] volatile and derived feature [message #545277 is a reply to message #545251] |
Wed, 07 July 2010 10:45 |
 Nils Israel
Messages: 72
Registered: May 2010 |
Member |
|
|
Hi Ralf and Eike,
@Ralf you were right, it works with dynamic feature delegation, thanks.
@Eike The way you described in the other post is the way I tried before.
I just replaced the generated code with my own. I am using databinding
to update the textfields but the textfield of the derived feature
doesn't get updated since the databinding code uses the eGet method
instead of my own getter.
And you were right, I don't want to persist the computed value. The
feature ist flagged as: derived, volatile and transient. (BTW: whats the
difference between volatile and transient?)
Could you explain what is wrong about using dynamic feature delegation
and overriding the getter method?
Thanks,
Nils
Am 07.07.2010 11:56, schrieb Eike Stepper:
> Hi Ralf,
>
> You're generally right about the dynamic feature delegation, but I
> suspect (and hope) that Nils really wants to replace the whole getter
> logic without persisting anything for the derived features.
>
> Cheers
> /Eike
>
> Contact: http://www.esc-net.de Blogger
> <http://thegordian.blogspot.com>Twitter
> <http://twitter.com/eikestepper>Linkedin
> <http://de.linkedin.com/in/eikestepper>Xing
> <http://www.xing.com/profile/Eike_Stepper>
> Article: What exactly is inside that p2 repository?
> < http://thegordian.blogspot.com/2010/05/what-exactly-is-insid e-that-p2.html>
>
>
> Am 07.07.2010 11:46, schrieb Ralf Ellner:
>
>> Nils,
>>
>>> I have an Ecode model with classes with some volatile and derived
>>> features. Without CDO I would
>>> set the feature delegation method to 'none' and would override the
>>> generated getter methods. But since I am using CDO, which
>>> requires 'reflective' feature delegation method this doesn't work.
>>>
>>> Where is the correct place to compute the value of the derived feature?
>> if you are using EMF 2.5+ you could set feature delegation to 'dynamic'
>> and implement the generated getter methods. See note at the bottom of
>> http://wiki.eclipse.org/Preparing_EMF_Models_for_CDO
>>
>> Best regards, Ralf
|
|
|
| Re: [CDO] volatile and derived feature [message #545299 is a reply to message #545277] |
Wed, 07 July 2010 11:21 |
|
Am 07.07.2010 12:45, schrieb Nils Israel:
> Hi Ralf and Eike,
>
> @Ralf you were right, it works with dynamic feature delegation, thanks.
>
> @Eike The way you described in the other post is the way I tried before. I just replaced the generated code with my own. I am using databinding to update the textfields but the textfield of the derived feature doesn't get updated since the databinding code uses the eGet method instead of my own getter.
Well, that's a piece of information that you didn't give in your first question ;-(
> And you were right, I don't want to persist the computed value. The feature ist flagged as: derived, volatile and transient. (BTW: whats the difference between volatile and transient?)
>
> Could you explain what is wrong about using dynamic feature delegation and overriding the getter method?
Nothing, then.
Cheers
/Eike
----
http://www.esc-net.de
http://thegordian.blogspot.com
http://twitter.com/eikestepper
|
|
|
| Re: [CDO] volatile and derived feature [message #545301 is a reply to message #545299] |
Wed, 07 July 2010 11:32 |
Nils Israel
Messages: 72
Registered: May 2010 |
Member |
|
|
Am 07.07.2010 13:21, schrieb Eike Stepper:
> Am 07.07.2010 12:45, schrieb Nils Israel:
>> Hi Ralf and Eike,
>>
>> @Ralf you were right, it works with dynamic feature delegation, thanks.
>>
>> @Eike The way you described in the other post is the way I tried
>> before. I just replaced the generated code with my own. I am using
>> databinding to update the textfields but the textfield of the derived
>> feature doesn't get updated since the databinding code uses the eGet
>> method instead of my own getter.
> Well, that's a piece of information that you didn't give in your first
> question ;-(
>
>> And you were right, I don't want to persist the computed value. The
>> feature ist flagged as: derived, volatile and transient. (BTW: whats
>> the difference between volatile and transient?)
>>
>> Could you explain what is wrong about using dynamic feature delegation
>> and overriding the getter method?
> Nothing, then.
OK ;)
Thank you both,
Nils
|
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|
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