Skip to main content

Details of JSF's MVC implementation:

Still reading Rick Hightower's article on JSF.


This image has been referenced from Rick Hightower's article.

The JSP page (essentially the tags) is bound to a server side view_root that maintains the state of the UI components. The view root is a composite just like Swing components. Any changes a user makes in their browser's view get reflected in the state of the view root. The view is also linked to properties (or nested properties) of a backing bean. It is recommended that we do not put business logic in the backing bean, they are meant to mediate between the view and the model. At first I thought, why do we need these backing beans? The properties can be set in the View Root objects, and they can handle the events as well, but I think there is a good reason for them. The View Root components are written by the component provider. We do not have control on them. However our application needs to have event handlers, and maybe transfer objects. These are bound to the view through the backing beans. So the backing beans act as the glue between the view and the model. Is there a cleaner way to do this? Maybe not.

How do the values from the front end actually get set in the backing bean? I think the components in the view root will invoke the setters when they are updated. Then exactly what role does the faces Servlet play?

Comments

Popular posts from this blog

Running your own one person company

Recently there was a post on PuneTech on mom's re-entering the IT work force after a break. Two of the biggest concerns mentioned were : Coping with vast advances (changes) in the IT landscape Balancing work and family responsibilities Since I have been running a one person company for a good amount of time, I suggested that as an option. In this post I will discuss various aspects of running a one person company. Advantages: You have full control of your time. You can choose to spend as much or as little time as you would like. There is also a good chance that you will be able to decide when you want to spend that time. You get to work on something that you enjoy doing. Tremendous work satisfaction. You have the option of working from home. Disadvantages: It can take a little while for the work to get set, so you may not be able to see revenues for some time. It takes a huge amount of discipline to work without a boss, and without deadlines. You will not get the benefits (insuranc

Testing Groovy domain classes

If you are trying to test Grails domain class constraints by putting your unit test cases in the 'test/unit' directory, then your tests will fail because the domain objects will not have the 'valdate' method. This can be resolved in two ways: Place the test cases inside test/integration (which will slow things down) Use the method 'mockForConstraintsTests(Trail)' to create mock method in your domain class and continue writing your test cases in 'test/unit' What follows is some example code around this finding. I am working on a Groovy on Grails project for a website to help programmers keep up and refresh their skills. I started with some domain classes and then moved on to write some unit tests. When we create a Grails project using grails create-app , it creates several directories, one of which is a directory called 'test' for holding unit tests. This directory contains two directories, 'unit', and 'integration' for unit and

Planning a User Guide - Part 3/5 - Co-ordinate the Team

Photo by  Helloquence  on  Unsplash This is the third post in a series of five posts on how to plan a user guide. In the first post , I wrote about how to conduct an audience analysis and the second post discussed how to define the overall scope of the manual. Once the overall scope of the user guide is defined, the next step is to coordinate the team that will work on creating the manual. A typical team will consist of the following roles. Many of these roles will be fulfilled by freelancers since they are one-off or intermittent work engagements. At the end of the article, I have provided a list of websites where you can find good freelancers. Creative Artist You'll need to work with a creative artist to design the cover page and any other images for the user guide. Most small to mid-sized companies don't have a dedicated creative artist on their rolls. But that's not a problem. There are several freelancing websites where you can work with great creative ar