W3car project

1
W3car project
Emmanuel Castellani Laurent Marchese Nicolas
Pastorelly
Wolfgang Kieß Johannes Walch Claudia Schremmer
Teleseminar Nice-Mannheim Year 2001-2002
2
Overview
1 General information 1.1 Big Picture 1.2
Initial Spec 1.3 Actual Spec
2 Technical informations 2.1 Server 2.2
Games 2.3 Browser 2.4 ClassLoader 2.5
Communication 2.6 Krypto Package 2.7 IPAQ
Java
3 Demonstration
3
Big Picture

• DCX Speed3 Project
• Prototype of UMTS car on Monaco Telecom network
• Emphasis on bandwidth-consuming type of 3G
  services
• DCX, Sun, Jentro, Siemens, MDBS joint venture

1 General information 1.1 Big Picture
1.2 Initial Spec 1.3 Actual Spec 2 Technical
informations 3 Demonstration
4
W3Car Services
1 General information 1.1 Big Picture
1.2 Initial Spec 1.3 Actual Spec 2 Technical
informations 3 Demonstration
5
Initial Specification

• Emergency service for UMTS car
• Using audio and video communication
• SUN-Jentro Platform for InCar Computer not ready
• Speed3 Project not started yet
• Very complex and proprietary technologies

1 General information 1.1 Big Picture
1.2 Initial Spec 1.3 Actual Spec 2 Technical
informations 3 Demonstration
6
Actual Specification

• New focus Architecture prototyping instead of
  Features Delivery
• Entertainment(Backseat) Applications
• Java Client Prototype for IPAQ/mobile network
  device

1 General information 1.1 Big Picture
1.2 Initial Spec 1.3 Actual Spec 2 Technical
informations 3 Demonstration
7
Important Technology

• Technologies/Features proposed
• Java
• XML-RPC / SOAP based communications
• Integrated web browser
• Download Java(jar-file) Entertainment
• Applications to IPAQ

1 General information 1.1 Big Picture
1.2 Initial Spec 1.3 Actual Spec 2 Technical
informations 3 Demonstration
8
Application Overview
1 General information 1.1 Big Picture
1.2 Initial Spec 1.3 Actual Spec 2 Technical
informations 3 Demonstration
9
Server
1 General information 2 Technical
informations 2.1 Server 2.2 Games 2.3
Browser 2.4 ClassLoader 2.5 Communication
2.6 Krypto Package 2.7 IPAQ Java 3
Demonstration
10
Server

• DBMS (MySql)

1 General information 2 Technical
informations 2.1 Server 2.2 Games 2.3
Browser 2.4 ClassLoader 2.5 Communication
2.6 Krypto Package 2.7 IPAQ Java 3
Demonstration
Dynamic
Contains references of games

• Web Server (Servlets, JSP)

JSP dynamic Web Page showing games
Servlet producing messages

• Multiple Game servers

11
Server
Architecture
1 General information 2 Technical
informations 2.1 Server 2.2 Games 2.3
Browser 2.4 ClassLoader 2.5 Communication
2.6 Krypto Package 2.7 IPAQ Java 3
Demonstration
Games Server
DBMS
Games Server
...
Games Server
Web Server JSP Servlets
12
Games Development
1 General information 2 Technical
informations 2.1 Server 2.2 Games 2.3
Browser 2.4 ClassLoader 2.5 Communication
2.6 Krypto Package 2.7 IPAQ Java 3
Demonstration
13
Games Development
1 General information 2 Technical
informations 2.1 Server 2.2 Games 2.3
Browser 2.4 ClassLoader 2.5 Communication
2.6 Krypto Package 2.7 IPAQ Java 3
Demonstration

• Anybody could develop games
• Need to standardize the games
• Games must extends an abstract class and
  redifined start() and stop() methods
• gtTo cast objects downloaded into Games like
  Plugins system

14
Browser
Two possibilities
1 General information 2 Technical
informations 2.1 Server 2.2 Games 2.3
Browser 2.4 ClassLoader 2.5 Communication
2.6 Krypto Package 2.7 IPAQ Java 3
Demonstration

• 1- IceBrowser (bean)
• Complete Web browser
• Problems
• Conflict with our ClassLoader
• No compatibility with IPAQ

• 2- Simple java files using swing API
• No ClassLoader, no security manager ...

15
ClassLoader
1 General information 2 Technical
informations 2.1 Server 2.2 Games 2.3
Browser 2.4 ClassLoader 2.5 Communication
2.6 Krypto Package 2.7 IPAQ Java 3
Demonstration
16
ClassLoader

• To download and instantiate jarFile via HTTP
• First version
• Used JarURLConnection to download the game
  directly in the virtual machine
• Problem with the jdk1.1.8
• Second version
• Used simple URLConnection
• The jarFile is written to the fileSystem

1 General information 2 Technical
informations 2.1 Server 2.2 Games 2.3
Browser 2.4 ClassLoader 2.5 Communication
2.6 Krypto Package 2.7 IPAQ Java 3
Demonstration
17
ClassLoader
1 General information 2 Technical
informations 2.1 Server 2.2 Games 2.3
Browser 2.4 ClassLoader 2.5 Communication
2.6 Krypto Package 2.7 IPAQ Java 3
Demonstration
18
Communication
1 General information 2 Technical
informations 2.1 Server 2.2 Games 2.3
Browser 2.4 ClassLoader 2.5 Communication
2.6 Krypto Package 2.7 IPAQ Java 3
Demonstration
19
Communication

• We wanted to have a flexible, easy to use
  protocol which can easily be debugged (and
  simulated manually) gt XML

1 General information 2 Technical
informations 2.1 Server 2.2 Games 2.3
Browser 2.4 ClassLoader 2.5 Communication
2.6 Krypto Package 2.7 IPAQ Java 3
Demonstration

• SOAP
• Complex protocol
• SOAP-Server on IPAQ ?
• gt limited Resources
• Extensible architecture for future integration

20
JAXB messaging

• JAXB Java XML Binding
• In our case marshal (serialize to XML) the
  Message and transmit it as String
• Receiver unmarshals the XML String to a Message
• Marshaling/Unmarshaling framework is generated
  with a tool (castor)
• Grammar (w3c schema ) ltgt Class (Java)
• XML-Document ltgt Object Instance

1 General information 2 Technical
informations 2.1 Server 2.2 Games 2.3
Browser 2.4 ClassLoader 2.5 Communication
2.6 Krypto Package 2.7 IPAQ Java 3
Demonstration
21
Communication

• Message objects with set and get methods
• Call the send(Message m) Method
• Message is transformed into XML, send as a String
  and the object reconstructed on the receiving
  side.

1 General information 2 Technical
informations 2.1 Server 2.2 Games 2.3
Browser 2.4 ClassLoader 2.5 Communication
2.6 Krypto Package 2.7 IPAQ Java 3
Demonstration
Sender
ltxmlgt ltaaaagtlt/aaaagt ltbbgtlt/bbgt lt/xmlgt
Message Service
Message Object
22
Krypto Package
1 General information 2 Technical
informations 2.1 Server 2.2 Games 2.3
Browser 2.4 ClassLoader 2.5 Communication
2.6 Krypto Package 2.7 IPAQ Java 3
Demonstration
23
Krypto Package

• Motivation
• Download an application and execute it
• risk of malicious code
• security problem
• Solution
• Trusted party signs the jar file using asymmetric
  cryptography
• Before loading, verify the signature

1 General information 2 Technical
informations 2.1 Server 2.2 Games 2.3
Browser 2.4 ClassLoader 2.5 Communication
2.6 Krypto Package 2.7 IPAQ Java 3
Demonstration
24
How it works

• Generate a key pair with the JAVA keytool
• Sign the file with the W3carSigner
• On each request for a game, the Signature is
  transmitted with the other information via the
  MessageService
• The client uses the signature to verify the file
  before executing the game

1 General information 2 Technical
informations 2.1 Server 2.2 Games 2.3
Browser 2.4 ClassLoader 2.5 Communication
2.6 Krypto Package 2.7 IPAQ Java 3
Demonstration
25
Implementation

• Java.security package contains all necessary
  classes
• the package is not supported by the JVM on the
  IPAQ
• the signature mechanism is disabled on the
  IPAQ, but will be demonstrated on a laptop.

1 General information 2 Technical
informations 2.1 Server 2.2 Games 2.3
Browser 2.4 ClassLoader 2.5 Communication
2.6 Krypto Package 2.7 IPAQ Java 3
Demonstration
26
Ipaq Java

• Insignia Jeode JRE Conflict with our ClassLoader
• Java 1.1 compatible including java.security
• Commercial package
• Sun Personal Java JRE
• Java 1.1 compatible without java.security
• Other OS than Windows CE 3.0
• Linux
• Java OS

1 General information 2 Technical
informations 2.1 Server 2.2 Games 2.3
Browser 2.4 ClassLoader 2.5 Communication
2.6 Krypto Package 2.7 IPAQ Java 3
Demonstration
27
Evaluation of JRE

• Problem Browser we choose needs swing
• Solution Porting swing to IPAQ using jar file
• Swing is only lightweight implementation on top
  of AWT
• did not work with Jeode PersonalJava
• JRE of Choice Personal Java

1 General information 2 Technical
informations 2.1 Server 2.2 Games 2.3
Browser 2.4 ClassLoader 2.5 Communication
2.6 Krypto Package 2.7 IPAQ Java 3
Demonstration
28
Java on IPAQ

• Java is very slow on IPAQ due to limited
  resources
• Developing on a limited device is difficult,
  testing takes a lot of time
• Better environment a specialized Java OS or
  compiled binaries

1 General information 2 Technical
informations 2.1 Server 2.2 Games 2.3
Browser 2.4 ClassLoader 2.5 Communication
2.6 Krypto Package 2.7 IPAQ Java 3
Demonstration
29
Demonstration
30
Conclusion

• The goal of the project was reached.
• Work Experience Similiar to an industrial
  project
• Investigation on the best technologies, no exact
  specification
• Short time for delivery (Specification and
  Implementation done at the same time)
• Personal Experience
• We got used to video conference and foreign
  languages

• In the end it was a lot of fun ...