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Date: Thu, 2 Nov 2006 16:35:02 +0100
From: "Emmanuel Lecharny" <elecharny@gmail.com>
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Subject: Re: ApacheDS partition implementation based on Relational Model
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Hi Ole,

On 11/2/06, Ole Ersoy <ole_ersoy@yahoo.com> wrote:
>
> Hi Ersin,
>
> <snip/>
> Personally I need to be able to go between an LDAP
> format, XML Schema format, and a relational format.

This will be possible really soon, at least from ldap to XML. Pam is
writting a DSML codec, so you will be able to extract data from LDAP and put
them in XML format (using DSML V2). You will also be able to send data to a
ldap server using DSML.


I'm planning on going with need a 4th representation
> of
> those  3, which will be Eclipse EMF Ecore (A subset of
> OMG's meta object facility).
>
> That way ecore is the common denominator.


At this point, I really think that DSML might be the perfect pivot
description, because LDIF is only representing data while DSML can express
operations. For instance, if you want to write a LDAP proxy, you can do that
with DSML requests and response (and the LdapStudio ldap browser is working
this way, so, yes, this is possible :). I don't think we need a 4th
description meta-stuff :) KISS, bros !

So the initial thinking is that ldap attributes will
> be mapped to attributes on an Ecore based model object
> (Just a pojo really supported by the Eclipse EMF API).
>
> The same Ecore model is used to generate the Hibernate
> mapping (Preferably using annotations).
>
> Then it's done.  Hibernate takes care of the rest.


Well, this is a vision which is not  taking into account the performance
issues you will have if you do that. I may be wrong - and I hope to be,
because this seems to be _so_ simple that I really want it to work -, but as
an old programmer, I don't believe in god or in 'snap your finger and the
tool will do the rest' thingy ... Yeah, I'm an agnostic old fart ;) Make me
believe in it : I want a working sample !

I still need to put this in complete context, adding
> in Alex's thoughts on virtual directories, etc.
>
> That's a little off though...after the rpm mojo gets
> done.


Yeah, that's seems pragmatic :) Thanks for the work done on RPM, man !

Cheers,
> - Ole


Emmanuel

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Hi Ole,<br><br><div><span class="gmail_quote">On 11/2/06, <b class="gmail_sendername">Ole Ersoy</b> &lt;<a href="mailto:ole_ersoy@yahoo.com">ole_ersoy@yahoo.com</a>&gt; wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Hi Ersin,<br><br>&lt;snip/&gt;<br>Personally I need to be able to go between an LDAP<br>format, XML Schema format, and a relational format.</blockquote><div>This will be possible really soon, at least from ldap to XML. Pam is writting a DSML codec, so you will be able to extract data from LDAP and put them in XML format (using DSML V2). You will also be able to send data to a ldap server using DSML.
<br>&nbsp;</div><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">I'm planning on going with need a 4th representation<br>of<br>those&nbsp;&nbsp;3, which will be Eclipse EMF Ecore (A subset of
<br>OMG's meta object facility).<br><br>That way ecore is the common denominator.</blockquote><div><br>At this point, I really think that DSML might be the perfect pivot description, because LDIF is only representing data while DSML can express operations. For instance, if you want to write a LDAP proxy, you can do that with DSML requests and response (and the LdapStudio ldap browser is working this way, so, yes, this is possible :). I don't think we need a 4th description meta-stuff :) KISS, bros !
<br></div><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">So the initial thinking is that ldap attributes will<br>be mapped to attributes on an Ecore based model object
<br>(Just a pojo really supported by the Eclipse EMF API).<br><br>The same Ecore model is used to generate the Hibernate<br>mapping (Preferably using annotations).<br><br>Then it's done.&nbsp;&nbsp;Hibernate takes care of the rest.
</blockquote><div><br>Well, this is a vision which is not&nbsp; taking into account the performance issues you will have if you do that. I may be wrong - and I hope to be, because this seems to be _so_ simple that I really want it to work -, but as an old programmer, I don't believe in god or in 'snap your finger and the tool will do the rest' thingy ... Yeah, I'm an agnostic old fart ;) Make me believe in it : I want a working sample !
<br></div><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">I still need to put this in complete context, adding<br>in Alex's thoughts on virtual directories, etc.
<br><br>That's a little off though...after the rpm mojo gets<br>done.</blockquote><div><br>Yeah, that's seems pragmatic :) Thanks for the work done on RPM, man ! <br></div><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Cheers,<br>- Ole</blockquote><div><br>Emmanuel<br></div></div><br>

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