EJB 3.0 + JSF 1.2 architecture question

Hi,
I have some experience with EJB 2.x and now we are working on another project with EJB 3.0 + JSF. In our old project, we created an EJB facade in the JSF (as an app. bean) so every call to the backend originated from the JSF went through this facade. We had everything contained in one app. bean.
But now, with the injection and annotations, how should we approach this? Should we contain all calls to the backend in one JSF bean or this is not neccessary anymore? Our next application will run in clustered env., back end and front end on different servers (both have two nodes), so we must call the EJBs from the session scope (at least I think so). How fast and resource consuming is the injection? We are speaking about thousands maybe tens of thousands users a day.
Thanks for any advanced EJB hints.

A typical setup is to use multiple EJBs each tailored for specific tasks. For example, you could create DAO EJBs and then put one or more service EJBs in front of them that does the calls to the DAOs and manages the transactions (basically performs the business logic). From your JSF managed beans you do calls to the service bean(s) only.
As for injection and resource consumption: I wouldn't worry about such matters. The injection is at the core of EJB3 and therefore you should use it freely. Most bookkeeping is done at server startup anyway, the runtime impact should be neglectable. It makes no difference how many users your site has per day, it is the hardware that should be tailored to the demands.

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Edited by: 905243 on Aug 23, 2012 1:27 PM

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"Paul S." <[email protected]> wrote in message
news:407c68a1$[email protected]..
>
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Little architectural question: why is all the stuff
that is needed to render a page put into the
constructor of a backing bean? Why is there no
beforeRender method, analogous to the
afterRenderResponse method? That method
can then be called if and only if a page has to be
rendered. It seems to me that an awful lot of
resources are waisted this way.There actually is such a method ... if you look at the FacesBean base class, there is a beforeRenderResponse() method that is called before the corresponding page is actually rendered.
>
Reason I bring up this question is that I have to do
a query in the constructor in a page backing bean.
Every time the backing bean is created the query is
executed, including when the page will not be
rendered in the browser...This is definitely a valid concern. In Creator releases prior to Update 6 of the Reef release, however, there were use cases when the beforeRenderResponse method would not actually get called (the most important one being when you navigated to a new page, which is a VERY common use case :-).
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So, something would have to exist to
determine which database to connect to and issue the
queries.Okay this could be a piece of logic after the user has provided username and password.
Login page = JSP;
Logic page = Servlet;
It sounds like the more object oriented approach would
be to use an EJB architecture. If that is the case,
since Java Web Start is what would be invoking the
application, should a servlet invoke the EJB rather
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Object orientation is the power of the java language, not specifically the power of the architecture. The architecture is based on some best practices. Do a search on the MVC pattern to learn more.
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such an architecture? If so, what benefits do
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I want to define the architecture before we start
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Regards
T

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Hello,
My problem is as follows: I would like for a session ejb to retrieve information from xml files (other that the ejb DDs of course...). I prefer the XML-file solution to the relational-database solution as it is more lightweight. (We haven't got the resources nor the skill to administrate a native xml database.) Am I allowed to read from the filesystem? What is the best architectural solution you would advise bearing in mind I need the information contained in the xml files to be available in java (in the session bean). Ideally I would drop xml files in a directory and they would automatically be parsed and taken into account by an ejb.
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Please help!
Thx in Advance!
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Cheers

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Thanks Slava,
You deserve more than a free trip to a conference for the time and effort
that you put into this board. I think you should be able to write this off
as a charitable contribution on your taxes. If you need someone to sign the
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code, etc)?
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Thomas A. Valletta
"Slava Imeshev" <[email protected]> wrote in message
news:3ec552f9$[email protected]..
Hi Thomas,
"Thomas A. Valletta" <[email protected]> wrote in message
news:[email protected]..
I need to create a hierarchy of simple objects. I will call my object
"Part" for simplicity. I have two Oracle tables to maintain my Part
hierarchy. The first table contains the detail for the part: number and
name. The second table maintains the relationship: parent_number and
child_number. I built Entity EJBs with CMP for both tables, but I don't
know if that is the "best practices" approach. If it is, how do I
define
the relationships (EJB 2.0)? If it is not, how would you build it?The best approach is the one that works for you. If the
combination of two beans works, leave it as is and
go ahead with next tasks.
Regards,
Slava Imeshev

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View = HTML
Controller = accepts user input and instructs model and view to perform actions based on that input, ie. maps end-user action to application response.
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OR
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