teleseminar nice – mannheim w3auction 1 w3 auction vanessa bouchet, lars klose, heiko kopitzki,...

1Teleseminar Nice – Mannheim w3auction

W3 AUCTION

Vanessa BOUCHET, Lars KLOSE, Heiko KOPITZKI,

Annabelle LE SONN, Dorothée ROBERT,Gunnar WIEDENFELS

Prof. Dr. Wolfgang EFFELSBERG

2Teleseminar Nice – Mannheim w3auction

CONTENT

• Project goals• 3rd generation auctioning• System architecture• Auction server• Database• Client applications• Experience• Demonstration• Conclusion• Outlook

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PROJECT GOALS

• Provide online auctions over a wireless LAN

• Allow users to also participate with notebook and desktop PCs connected to the Internet

• Provide different auction algorithms • Provide an administrator interface• Allow multiple auctions at the same

time

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3rd GENERATION AUCTIONING

• Like traditional auctions– Live– Fast– Interactive– Entertaining

• Like online auctions– Worldwide– Easy to participate

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SYSTEM ARCHITECTURE - Local

Access point

Auction server

Administration clientUser clients

• Usually in one auctioning room

• One human auctioneer

• Only the auctioneer can create auctions!

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SYSTEM ARCHITECTURE - Internet

Internet

UMTS WLAN LAN

Wireless Devices Stationary PCs

Auction Server

Dialup

• Open scenario worldwide!

• Non-guided, the auction server acts self-sufficient

• Everybody can create his own auctions

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SYSTEM ARCHITECTURE – UML

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AUCTION SERVER - Features

• Based on J2SE– Platform independent

• Intelligent auction algorithms– Moderation – Entertainment

• Extensible– Dynamically loadable algorithms– Open architecture

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AUCTION SERVER - Architecture

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AUCTION SERVER - Architecture

- Basic class that contains and connects other components

- Manages dynamic loading of algorithms

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AUCTION SERVER - Architecture

- Central place to store data:

- Users- Auctions- Categories- Errors

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AUCTION SERVER - Architecture

- Stores system errors and warnings in the DataStore

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AUCTION SERVER - Architecture

- Direct access to control the server via console:

- stop the server - load/unload algorithms

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AUCTION SERVER - Architecture

- Waits for connect requests on a TCP/IP port

- New connections are established

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AUCTION SERVER - Architecture

- Logical representation of a client connection

- Based on a TCP/IP client socket- Allows communication in both

directions- Permanently listens for incoming

messages, initiates appropriate action for each request

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AUCTION SERVER - Architecture

- Auctioneer role (logic processing)

- Autonomous termination- Broad variety of auction types- English and Dutch auction

algorithms included- Custom algorithms can be

added easily at runtime

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AUCTION SERVER - Architecture

- Starts auctions automatically at specified time

- Creates algorithm instances to allow users to enter and bid

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AUCTION SERVER - Architecture

- Different time / time zones on clients and server

- Users should neither wait unnecessarily long nor miss an auction

- Auctions happen in real-time- Unstable connections in

wireless environment- Detect connection loss and

ensure synchronous times

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DATABASE – Relation diagram

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DATABASE – Java interconnection

• JDBC class to connect to the mySql database management system

• The auction server and the database are interconnected by TCP and can be located in different places

• Implementation of methods to – Insert new tuples into relations– Select tuples with different criteria– Delete tuples from relations

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CLIENT APPLICATIONS - Requirements

• Executable on Compaq iPAQ under Windows CE as well as on regular desktop or notebook PC

• Graphical User Interface based on AWT (due to iPAQ VM)

• Support two-way communication according to w3auction protocol

• Provide auction user and server admin functionality

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CLIENT APPLICATIONS - Architecture

ClientCommunicator ClientGUI

UserServer

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ONE OR TWO APPLICATIONS ?

Core functionalityUser functionality• Create auctions• Browse auctions• Participate(bid)• Maintain user

account

• Communication• Framework

Admin functionality

• Maintain user accounts

• Control current connections

• View error log• Supervise

ongoing auctions• Add and delete

categories

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OUR CHOICE : TWO SEPARATE APPLICATIONS

• Clear structure• Administrator is never a user, always overhead• Easy implementation through

concept of inheritance

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DEMONSTRATION

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EXPERIENCE - Project

• Using new technologies:– iPAQ– Wireless LAN– OO design and programming– UML and Rational Rose

• A complete project:– Analysis – Implementation– Database management– Test– Documentation

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EXPERIENCE – Tele-cooperation

• Language difficulties and distance• Weekly videoconference between Nice

and Mannheim• Very long discussions about the

functionality in the beginning• Use of TWIKI website to exchange

documents and CVS for version control

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CONCLUSION

• w3auction system operational• User client and admin client easy

to use• Object oriented design and

implementation proved to be very powerful

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OUTLOOK

• Security• Integrate settlement• Usability study to improve the

user interface• Screen layout should be adapted

to notebook and desktop PC

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THANK YOU FOR YOUR ATTENTION

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AUCTION SERVER - Class Diagram