| [CDO] Preprocessing on the CDO Server [message #430217] |
Wed, 13 May 2009 15:06  |
Eclipse User |
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Originally posted by: maurice.gmail.com
Hi!
I'd like to find a way of doing some preprocessing on incoming models to
the CDO Server. Basically transforming the data, server-side, before the
commit attempt.
Is there an in-built mechanism on the server that I could exploit to this
end?
Thanks!
Maurice
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| Re: [CDO] Preprocessing on the CDO Server [message #430258 is a reply to message #430224] |
Thu, 14 May 2009 10:56  |
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This is a multi-part message in MIME format.
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Guys,
I'm not so sure if this mechanism (IRepository.WriteAccessHandler) is
what you're looking for! There's an important pont "hidden" in the JavaDocs:
| * @param commitContext
* The context of the commit operation that is to be executed against the backend store. The context can be
* used to *introspect *all aspects of the current commit operation.|
It's really only usable to *introspect* the objects and deltas. If you
were to change these informations before they're passed to the store
then you would probably at least corrupt the caches (and maybe more
general state) of the committing client. It could even be that the
repository caches get corrupted (I would have to look into the code, but
the first issue is a veto anyway).
We could consider an enhancement request.
Cheers
/Eike
----
http://thegordian.blogspot.com
Maurice schrieb:
> Looks like what I need, thanks!
>
> Maurice
>
> Tom Schindl wrote:
>
>> Hi,
>
>> There are read and write interceptors you one can push into the server
>> which are consulted for every read/write.
>
>> I used them in my example application for EclipseCon [1] to control who
>> is allowed to write back and who isn't but I guess you can also use them
>> for other purposes.
>
>> Tom
>
>>
> [1] http://github.com/tomsontom/emf-databinding-example/blob/0ae 7faa67697a84171846852a5c5b0492d9a8f7d/org.eclipse.emf.exampl e.library.cdo.server/src/org/eclipse/emf/example/library/cdo /server/LibraryServerApplication.java
>
>
>> Maurice schrieb:
>>> Hi!
>>>
>>> I'd like to find a way of doing some preprocessing on incoming
>>> models to
>>> the CDO Server. Basically transforming the data, server-side, before
>>> the
>>> commit attempt.
>>> Is there an in-built mechanism on the server that I could exploit to
>>> this end?
>>>
>>> Thanks!
>>>
>>> Maurice
>>>
>
>
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Guys,<br>
<br>
I'm not so sure if this mechanism (IRepository.WriteAccessHandler) is
what you're looking for! There's an important pont "hidden" in the
JavaDocs:<br>
<br>
<title></title>
<style type="text/css">
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</style>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<!-- start source code --> <td align="left" nowrap="nowrap"
valign="top"> <code><font color="#ffffff">
Cheers
/Eike
----
http://www.esc-net.de
http://thegordian.blogspot.com
http://twitter.com/eikestepper
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