Using J2EE Design Patterns
About the VSM Sample Application
The Virtual Shopping Mall (VSM) sample application
enables vendors to set up online shops, customers to browse through the shops,
and a system administrator to approve and reject requests for new shops and
maintain lists of shop categories.
About VSM Users
The application identifies three types of users—Mall
Administrator, Shop Owner and Mall Customer—each with different privileges.
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The Mall Administrator is the superuser and has
complete control over all the activities that can be performed. The application
notifies the administrator of all shop creation requests, and the adminstrator
can then approve or reject them. The administrator also manages the list
of available product categories. The administrator can also view and delete
entries in the guestbook. |
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Any user can submit a shop creation request through
the application. When the request is approved by the Mall Administrator,
the requester is notified, and from there on is given the role of Shop Owner.
The Shop Owner is responsible for setting up the shop and maintaining it.
The job involves managing the sub-categories of the items in the shop. Also,
the shop owner can add or remove items from his shop. The Shop Owner can
view different reports that give details of the sales and orders specific
to his shop. The Shop Owner can also decide to close shop and remove it
from the mall. |
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A Mall Customer can browse through the shops
and choose products to place in a virtual shopping cart. The shopping cart
details can be viewed and items can be removed from the cart. To proceed
with the purchase, the customer is prompted to login. Also, the customer
can modify personal profile information (such as phone number and shipping
address) stored by the application. The customer can also view the status
of any previous orders, and cancel any order that has not been shipped yet. |
The following use-case diagram shows how each type of user
interacts with the VSM application.
Database Schema
The figure below shows the database schema for the VSM application.
Conclusion
The Virtual Shopping Mall (VSM) sample application shows how
design patterns can simplify enterprise development tasks, and demonstrates
approaches you can use to implement common J2EE design patterns. If you're interested
in other approaches, you can visit OTN to learn how Oracle's J2EE-compliant
Business Components for Java (BC4J) framework provides off-the-shelf implementations
of numerous design patterns you would otherwise have to code by hand. The article
Simplifying
J2EE and EJB Development with BC4J provides more information.
Questions or comments? Post a message in the OTN
Sample Code discussion forum or send email to the author.
Using J2EE Design Patterns: About the Virtual Shopping
Mall Sample Application
Author: Robert Hall, Oracle Corporation
Date: May 2002
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