J2ME and the IVY Platform

1. J2ME and the IVY Platform Confidential & Proprietary Information of Digital Focus

2. Agenda • Digital Focus • J2ME • Quick overview • What’s in & what’s out • Networking capabilities • IVY & JXTA • Why and what • IVY Architecture and Design • JXTA protocols and components Confidential & Proprietary Information of Digital Focus

3. Digital Focus • Founded in 1995 • Headquartered in Herndon, Virginia • Long history of excellence with Java technology… Confidential & Proprietary Information of Digital Focus

4. Our Clients Confidential & Proprietary Information of Digital Focus

5. J2ME • J2ME – Java 2 MicroEdition • Java for small, mobile and embedded devices • Configurations (horizontal) • CLDC, CDC • Profiles (vertical) • MIDP, Foundation, Palm Confidential & Proprietary Information of Digital Focus

6. J2ME Architecture • CLDC Configuration • KVM, networking • Lowest common denominator for portability • No optional elements • MID profile • GUI • RMS • Timers • Lifecycle Confidential & Proprietary Information of Digital Focus

7. What’s missing • Reduced number support • float, double primitives • Double, Float classes • Extendable UI components • Final High-level components • New components subclass Canvas • Lacks: • JNI • Sound API • Serialization • Reflection • User defined class loaders Confidential & Proprietary Information of Digital Focus

8. Networking • Only HTTP is required with CLDC • Not great for mobile wireless solutions • Stateful – tough with mobile IP • Stream oriented • Generic Connection Framework • Opens protocol support (sockets, serial, datagram,…) • Runtime binding to protocol • J2ME generally designed as a “client” However: • Can be a Datagram server • Interfaces exist for socket serving Confidential & Proprietary Information of Digital Focus

9. “Designing for small places” • Device resources limit OO design • Use objects judiciously – consider patterns like Flyweight • Use lazy instantiation where feasible • Design tradeoffs: • Classes, methods (encapsulation vs space) • Inheritance (saves space, increases cpu) • Names (maintainability vs space) • Use an obfuscator • Optimizations • Reuse objects; avoid needless re-instantiation • StringBuffer vs String • Use String wrappers when hashing Confidential & Proprietary Information of Digital Focus

10. Devices RIM 5180 Nokia 9120 Nextel I85s Kyocera Sprint Confidential & Proprietary Information of Digital Focus

11. Confidential & Proprietary Information of Digital Focus

12. What is it? • Lightweight wireless platform for Mobile to Mobile (M2M) collaboration • Every Peer is a client, server and router • Enables rapid development • Easy, low cost entry • Provides API for locating, communicating with and sharing services between groups/peers • Supports Web-enabled start-up and authentication • Open standards-based • Web Services, JXTA • XML • Built for wireless Java • J2ME (MIDP/CLDC) • Personal Java • CVM & Foundation Profile Confidential & Proprietary Information of Digital Focus

13. Why IVY • Growing demand for P2P applications • Groove Networks • Games, Instant messaging • Napster, GNUtella • Mesh Networks • Technology is available • Programmable, wireless devices • Nextel’s I85 • RIM’s 5820 J2ME/GPRS support • Nokia 9210 (personal java and MIDP) • RIM 8150 • Over the air provisioning • Investment in 2.5G infrastructure • Network providers want to increase data usage Confidential & Proprietary Information of Digital Focus

14. What & Why not JXTA? • What is JXTA • www.jxta.org • Mainly 6 protocols • Is IVY compliant with JXTA? No, but almost • Uses JXTA protocols • JXTA requires TCP/IP and/or HTTP; • Datagram/UDP not supported • Why use Datagrams • Optimal for wireless networks. • Network providers use datagrams under WAP, HTTP and sockets. • Why not use JXME (JXTA’s J2ME project) • Very early stages • Uses TCP/Http and centralized “super server” • Polling architecture. Not really P2P? Confidential & Proprietary Information of Digital Focus

15. Group Peer Peer Peer Endpoint Service Pipe Advertisement JXTA • High-level abstraction • Hides complexity of physical network • Single uniform addressability for all peers • Simple model for discovery, addressing and service sharing • Based on JXTA – 6 protocols • Peer Discovery • Peer Resolver • Peer Information • Peer Membership • Pipe Binding • Endpoint routing • XML messages • Text • Binary • 1 Request & 1 Response • Stateless Confidential & Proprietary Information of Digital Focus

16. Conceptual Architecture • APIs • Peer , groups • Services, Ads • Pipes • Protocols & Formats • JXTA XML & binary • SOAP/WSDL • Messages • Full duplex • Datagrams • HTTP,HTTPS • Cross Platform • J2ME • J2SE Confidential & Proprietary Information of Digital Focus

17. Service-oriented Architecture Confidential & Proprietary Information of Digital Focus

18. Key Design Drivers • Network connectivity • Asynchronous API with listeners • Datagrams with reliable upper level • Minimize server dependency • Peer Group advertisements • Get credentials • Small footprint • Implement “needed” protocols • 30K un-obfuscated • JXTA compliant Confidential & Proprietary Information of Digital Focus

19. Java Packages • Ivy.api – Just interfaces and factories for services and abstracts (pipes, messages, peers, endpoints) • Ivy.impl – Implementations for the ivy.api package • Ivy.util – constants and static methods • Ivy.net – Differs whether J2ME or J2SE • Ivy.exception Confidential & Proprietary Information of Digital Focus

20. Contact InformationDigital Focus, Inc.13825 Sunrise Valley DriveSuite 220Herndon, VA 20171www.digitalfocus.comTom WhitcombChief Technology Officertom.whitcomb@digitalfocus.com703.561.5884orDave HoffmanVice Presidentdave.hoffman@digitalfocus.com703.561.5963 Confidential & Proprietary Information of Digital Focus