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The application is a Web site for online book sales.

The inventory information such as book categories and the number of books in each category is displayed in the Web home page (see Figure 1).

For that you need a server based on protocol like Comet.

Check this project for more information In your case, if you/your company can afford it, I'd recommend Wt.

What if the dynamic elements cannot be identified until run time?

At this time, JSF has no good solution to this problem.

(Eg, a random number via PHP, your sales stats, your DOB, etc, wherever your imagination takes you!

Because actions such as adding or removing a book in the inventory leads the server-side data to change, you must monitor these actions.I have considered the following scheme: Allocate shared memory in the C program for the sensor data, which can be read by a server side script like php.Then have some ajax or something requesting the data on a loop or timer event.The method for monitoring changes is to add a listener looking for changes of server-side data, and have the server-side notify the listener after any change occurs.Listing 1 shows how to register and de-register listeners to a class.

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Although you may be familiar with Java Swing applications such as "clock," in which data changes prompt GUI updates, or you might have read the implementation details of such applications in some basic Swing development guides, this approach will not work with my scenarios.

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