Hi,

as promised, i will do a more technical screencast now. I will show you, how to set up an XPage application, that is seperated into different layers, where each layer has its own responsibility. Why should you do this?

It’s extremely easy to switch datasources, you could even switch between datasources (Notes, SQL, Webservice,…) based on the current time, current user,… . You will do this in a central Java Class, using the Factory-Pattern. No Changes in XPages,… are necessary.

Calculating the status of Objects (overdue, approved,…), formatting of Names,… will be done in a central place, if you change the logic, no changes to the XPages (UI) will be necessary.

Accessing the data in your XPage will be more user friendly, because you can write object.getStatus() etc… to access information.

You can use all the great Java editing features of eclipse and ~ 30% of your application can be developed by a pure Java programmer, no notes knowledge necessary.

And I’m sure there are loads of more advantages, otherwise these multilayer architectures wouldn’t be the de-facto standard.

To better understand the architecture, you can download a stripped down version of the application, containing only the display of the users e-mails. 

If you are really interested in the subject and willing to learn Java, you should search the internet for the following topics: “Interface driven design”, “Data Access Objects”, “Factory Pattern” and maybe “Data Transfer Object”

Screencast (if you have problems viewing it, there is a link to download the .mp4 file after registering at vimeo

Demo NSF

*Update: the last 30 seconds of the sceencast are messed up, but you don’t really miss anything important, and i don’t want to recreate it now – its 00:52 am and i finally need some sleep

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