Separating Layers physically

Hi,
Under what circumstances should we provide physical separation of different layers such as presentation, business logic?
Does it make sense to keep the presentation layer in a web server (tomcat) and the business logic layer in an application server (glassfish, jboss)?
Or should everything reside in one application server?
Kindly help me with your suggestions.

Hi,
Under what circumstances should we provide physical
separation of different layers such as presentation,
business logic?As expressed before, there are no hard and fast rules, however I see three aspects involved in the decision: scalability, administration, maintenance
scalability: (note that I didn't say "performance") is probably the least impacting this decision:
Depending on the application, on its functional usage as well as its technical flows, you may want to fine-tune the repartition of resources devoted to the web tier independently from the resources devoted to the business tier. If the application undergoes a lot of servlet requests, but most of them do not invoke business services, you may want to have more web container nodes (say Nw) than you have EJB containers (say, Nb).
However, it's not necessarily a waste of resources to have them all in (NW=Nb) application servers: the business part of each of them will be less loaded than the web part, that's all.
Does it make sense to keep the presentation layer in
a web server (tomcat) and the business logic layer in
an application server (glassfish, jboss)?>
Or should everything reside in one application server?"A", "One"?
OK, so if the load is not that big, and you are confident enough in your application, and deem that you won't need clustering nor failover today, then the physical separation makes only sense if you plan to enable to have them tomorrow (say, cluster the web tier with 2-3 nodes while keeping only one business-tier node, or the other way round).
Note that I didn't mention that the database tier is most likely physically separated in all cases, if not for failover, be it only because the hardware requirements (disk, memory,...) are quite different from the web or AS hardware.
Administration:
Putting both web and business parts in the same AS enables you to monitor and manage all parts from a single management console, often an AS-specific one, cluster-aware, or an external tool using AS-specific agents.
By separating the layers you complexify the administration of the whole system; you may still have a single management console, but then it's necessarily an external tool, and you have to configure it to collect and correlate info from all nodes.
Maintenance:
Your application will have bugs, failures, outages. Even if very bug-free, it will undergo upgrades.
Separating the layers enables you to sometimes upgrade them independently (say, upgrade the web part for cosmetic enhancements with no impact on business logic).
This possibility should not be overestimated because as soon as the upgrade involves a coupling (e.g. modification of an API between the web and business tier), you will on the contrary be much safer to upgrade both in one atomic upgrade.
One last thing, if you deploy your apps as separate war and jars, instead of as one big ear, the AS will likely enable you to undeploy/upgrade/redeploy each part separately. In one EAR, the undeploy/redeploy is normally atomic, unless there are AS-specific enhancements.
In my case, the business tier has to serve both web
clients and application clients.
Both these clients may number in thousands.
I'm thinking of the following:
Web Clients => Web Server => Application Server =>
Database
Application Clients ========> Application Server =>
Database
But heavy load will be from the Application Clients.The fact that you have two different categories of clients that target different entry points of the application does not imply that you have to physically separate the entry points.

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Hi,
Can any one explain me in details what Whar are logical table, Physical table Logical data Source.
Any qucik help will be graetly appreciated

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Hi,
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http://members.cox.net/michael.henderson/Papers/SONET-SDH.pdf
http://www.eetimes.com/electrical-engineers/education-training/tech-papers/4136556/A-Tutorial-on-ITU-T-G-709-Optical-Transport-Networks-OTN-
http://networking.ringofsaturn.com/Protocols/sonet.pdf

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Poor Performance over Converged Networks using LBFO Team

Hi,
I have built a Hyper-v 2012 R2 cluster with converged networking and correct logical networks.
However, I notice that I am not able to utilise more than apprx 1gb over the converged network for live migration, cluster, management etc even though they have a total of 8 x 1gb physical adapters available (switch independant, dynamic load balancing).
e.g
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Without doing a case study on your environment, it would be pretty much impossible to give you a truly correct answer on what you should do.
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Again, that's in the generic sense. When you get into trying to tap the power of SMB Multichannel, that changes the equation. That's where the case study picks up.
Eric Siron Altaro Hyper-V Blog
I am an independent blog contributor, not an Altaro employee. I am solely responsible for the content of my posts.
"Every relationship you have is in worse shape than you think."

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If you are working in RGB mode
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Message was edited by: JJMack

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http://www.ddbcinc.com/askDDBC

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I have several interview segments and I would like to do a small digital zoom at the end of each clip. The background is slightly out of focus already and it doesn't look natural to zoom when the bokeh is not changing.
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Did some searches but I am probably not searching the right keywords. Can anyone point me in the right direction.
Thanks.

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hi all,
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Isn't this a bad design?
Would'nt it be better, to keep the view jsp pages as simple as possible, with only containing the jsf form definition.
How would you design a complex site, composed from different jsp fragments leveraging java server faces?
Perhaps doing a kind of preprocessing by a Servlet. This could probably be done using a Phase Event Listener, at the Render Response phase....
The view id is generated from the ViewHandler, according to 2.2.1 by the URL Path, either by using the /faces/* or the *.faces method. Isn't that difficult for big sites, to always stick to the this page naming scheme.
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-- Jakob

hi all,
by view ioc, I mean that the view as currently drawn
by the examples, is responsible for the whole page
production ( the view id are the jsp pages ). So the
view must actively include the other jsp fragments, in
order to build the site layout.
Isn't this a bad design?
Would'nt it be better, to keep the view jsp pages as
simple as possible, with only containing the jsf form
definition.
How would you design a complex site, composed from
different jsp fragments leveraging java server faces?
Perhaps doing a kind of preprocessing by a Servlet.
This could probably be done using a Phase Event
Listener, at the Render Response phase....
Struts developers have found the Tiles framework to be an appropriate solution for this sort of problem, and you'll be able to use Tiles along with JavaServer Faces using the Struts-Faces integration library (see my other posting today about an update to this library that corresponds to the final release of JavaServer Faces 1.0). I'm sure that other solutions centered around templating approaches will also emerge from other places. I've also been doing some experiments with components to do layout management (akin to things like BorderLayout and CardLayout in Swing, and its also likely we will see JavaServer Faces based component libraries in this space as well.
For 1.0, we focused primarily on the APIs for the components themselves, so templating was out of scope. Standardization here is certainly something that can be considered in future versions, but we didn't feel it was a prerequisite for a 1.0 release of a UI component framework.
The view id is generated from the ViewHandler,
according to 2.2.1 by the URL Path, either by using
the /faces/* or the *.faces method. Isn't that
difficult for big sites, to always stick to the this
page naming scheme.
Having a common prefix or extension turns out not to be the significant issue (after all, does it really matter that all your JSP pages end with "*.jsp"?) A key scalability issue for large-page-count apps is separating the physical names of the pages from the business logic that drives the navigation. In JavaServer Faces, you accomplish this by leveraging the navigation rules, so that action event handlers return simple strings that indicate what happened, and let the configured rules define where to go next.
I like the jsf principles, and would like to use it to
upgrade some of my existing web applications to using
jsf.Sounds like a good plan :-).
>
-- JakobCraig

Separating Layers physically

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