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<TITLE>Writing Advanced Applications, Chapter 1: Project Requirements and Modeling</TITLE>
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<H2>Writing Advanced Applications<BR>
<FONT SIZE="3">Chapter 1 Continued: Project Requirements and Modeling</FONT></H2>
<FONT SIZE="-1">[<A HREF="proj.html"><<BACK</A>] [<A HREF="index.html#contents">CONTENTS</A>] [<A HREF="proj3.html">NEXT>></A>]</FONT></DIV>
<P>
The first step in determining project requirements is to interview the
user base to find out what they want in an online auction. This is an
important step, and one that cannot be overrated because a solid base
of user-oriented information helps you define your key application
capabilities.
<P>
Chapter 2 walks through the application code, explains
how the Enterprise JavaBeans platform works, and tells you
how to run a live demonstration. If you have never seen
or used an online auction, here are mockups of the
<A HREF="./Auction/index.html">example auction
application</A> <CODE>HTML</CODE> pages.
<UL>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#interview">Interview User Base</A></FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">
<A HREF="#model">Model the Project</A></FONT>
</UL>
<HR>
<A NAME="interview"></A>
<H3>Interview User Base</H3>
For the sake of discussion and to keep things simple, this discussion
assumes interviews with the user base found auction
house and user requirements, as follows:
<p>
<STRONG>Auction House Requirements</STRONG>
<UL>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">Require buyer and seller information </FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">Bill sellers for posting items</FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">Record and report the day's transactions</FONT>
</UL>
<STRONG>User Requirements</STRONG>
<UL>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">Bid on or sell an item</FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">Search or view items for sale</FONT>
<LI><FONT FACE="Verdana, Arial, Helvetica, sans-serif">Notify buyer and seller of sale</FONT>
</UL>
<A NAME="model"></A>
<H3>Model the Project</H3>
After analyzing the requirements, you can build a use
case diagram for the application to gain a better
understanding of the elements needed in the application and
how they interact.
<P>
A use case diagram
shows the relationships among actors and use cases
within the system. A use case is a unique function in
a system, and an actor is the person or software that performs
the action or use case.
For example,
a buyer is the actor that performs the function (use case) of
bidding on an auction item, and the seller is the actor that performs
the use case of posting an item for auction.
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