How to create an event in web application?

Hi,
I am creating online auction application. I need to have an event trigerred when an auction on an item is finished. How can I do that?
Thank you

You could use the Observer design pattern...You'll find plenty of litterature on the subject.
You'd also want to take a look at how they implement the feature you're looking for in existing auction applications, like Sun's :
http://developer.java.sun.com/developer/onlineTraining/Programming/JDCBook/code.html
Sourceforge's Gavel, which is open source, so you can browse the CVS repository to look for source code :
http://sourceforge.net/projects/gavel/

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