business logic : Java processor vs webservices

Hi,

I need to perform some business logic (calculations) on data stored in a
database. I was looking at the doc and wondering about a good solution
for this implementation :

- Using pipelines to retrieve data from database, then use them in a
Java processor (or maybe using directly jdbc in the java processor to
avoid use of SQL processor?)
- Using webservices

Any advices or suggestions are welcome.

Thanks.



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I think xslt may be a good candidate for business logic,
and since you have the pipelines, you can take in steps
that aggregate/select/sort -- no need to put all the logic
in one script.

Xslt 2.0 functions or even extension libraries are
also available to you.

Cheers,
Hank

Hank Ratzesberger
http://nees.ucsb.edu/
Institute for Crustal Studies
University of California, Santa Barbara



----- Original Message -----
From: "Kim-Vân Ho-Dac" <[hidden email]>
To: <[hidden email]>
Sent: Wednesday, July 25, 2007 10:02 AM
Subject: [ops-users] business logic : Java processor vs webservices




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Hi,

Xslt is great for templates and presentation, but I'm not sure it's the
best solution for performing advanced business logic such as you could
do with Java for example. It would be ok if I only needed to use XPath
to grab a few elements and aggregate/select/sort, but here I need to
perform reports and compute calculation on data.

Cheers

Hank Ratzesberger a écrit :

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Kim-Vân Ho-Dac wrote: It's really up to what you prefer.

The web service approach (not necessarily SOAP by the way - you may just
do REST / XML over HTTP) separates very cleanly the presentation from
the rest of the system. It also allows you to implement that logic in
any language you want. But it is also usually a little more work to
implement such a service architecture.

I don't think there is any harm using the Java processor. If you decide
to migrate to using services later, and plan to implement them in Java,
you would even be able to reuse most of the code.

As mentioned, in simple cases, you can also use XSLT to implement logic.

-Erik

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Hi list, I'm new to Orbeon and looking for a hint ...

I have a session instance :
<xforms:instance id="session">
        <session xmlns=""/>
</xforms:instance>

... init on load
<xforms:send ev:event="xforms-ready" submission="sessionGet"/>
                       
... and then I would like to access the session instance using xsl (in the
body part of my html page) :
<xsl:if test="doc('instance-session')/info/user/role =
('ADMINISTRATEUR','AQUAREF','EXPERT')">

Any ideas ? Thanks a lot for your help.

Francois

                       









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François

All your XSL statements are applied before your html page
is transmitted to the client. In order to access session
variables in XSL, you must provide them in the model
attribute of your PFC:

<page id="my-page" model="get-session-info.xpl" view="my-view.xsl"/>

http://www.orbeon.com/ops/doc/reference-page-flow#page-model-page-view

You obtain the session variables document with the scope-generator
and you can aggregate it along with other inputs such as request headers
(request generator):

http://www.orbeon.com/ops/doc/processors-generators#scope-generator

Or, your model can provide several user-defined inputs to xsl:

http://www.orbeon.com/ops/doc/processors-xslt#user-defined

To access your session variables from _XForms_, you can
create an instance using XInclude or XSLT:

http://www.orbeon.com/ops/doc/reference-xforms-ng#xforms-instance-initialization

HTH,
Hank

Hank Ratzesberger
http://nees.ucsb.edu/
Institute for Crustal Studies
University of California, Santa Barbara


----- Original Message -----
From: "François-Xavier PRUNAYRE" <[hidden email]>
To: <[hidden email]>
Sent: Thursday, July 26, 2007 1:35 AM
Subject: [ops-users] How to get an instance in xsl ?


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