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From Ramy Mamdouh <>
Subject Re: Flow status and report.
Date Tue, 03 Sep 2002 12:33:11 GMT
Per-Olof Norén wrote:

> Hi cocooners,
> I´d like to give a real-life scenario using flowscripts.
> We are currently in the end phase of developing the base of an 
> enterprise system used for ordering/invoicing/crm tasks.
> All of this is done in cocoon using the flowscript and Jakarta OJB, 
> Axis   and torque.
> We decided to use the flowscript since its *the* way of creating web 
> based, data-intensive business systems. In theese scenarios the focus 
> are at error handling and usability. The gui is of course important 
> but not in the "flashy" sence, but rather that its possible to work 
> with the system for a whole work-day.
> Model: OJB
> View: XSP´s
> Controller: flowscript
> The Model:
> Trying the axis wsdl2java tools to connect to SOAP services was as 
> easy as stealing candy from a child, not a single problem.
> This inspired us to look for a similar approach when using a local 
> dbms for the other data. After some looking around we found OJB to be 
> perfect. We modified the Ant tasks that reads db metadata and creates 
> a file called repository.xml that is the database schema. The next ant 
> task is to create beans for each table in the repository.xml file. 
> This is done by velocity templates. Finally an "Operations" interface 
> is created by hand. This interface class is then used by the flowscript.
> Its incredible easy to modify the database, we just run our ant build 
> that rebuilds all our beans. Using axis we can also wrap our 
> "Operations" interface as a web service for future integration.
> The views:
> We created a sort of language for page definition that abstracted html 
> in xsp´s and this allows hard core coders to create pages that
> are graphically pleasing. The concept of xsp as the source of the 
> pages is perfectly fine, since it allows for some rendering logic to 
> be applied. For example disabling buttons and parts of a page.
> All data is provided in a java.util.Hashmap sent from the flowscript.
> The controller:
> This is of course the flowscript.
> In here we program the flow-logic and call the Model(Operations 
> interface) for retrieving / updating / creating data.
> We´ve devided some common functions such as showing error messages and 
> delete confirms into "functions.js".
> To summarize:
> Using flowscript, xsp and OJB is the *perfect* match for creating 
> web-based enterprise systems
> Since this is the dev list, i also have som dev questions:
> I have problems putting things in a session variable from the 
> flowscript using this syntax: cocoon.session["user_id"] = 
> user.getUser_id(); 

I use the session inside the flow script using :
var ses = cocoon.request.getSession();

then dealing with the ses variable as we do in Java, like 
ses.setAttribute(key, value) , etc
Hope it helps.

> Does anyone have any idea´s?
> I will soon send a little patch for jpath.xsl that fixes for-each 
> functionality that we use.
> /Per-Olof Norén
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Ramy Mamdouh Kamel
Software Engineer
Imkenberg Software

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