Bluetooth™ and Java™ Technologies in the Wireless Environment

1. Bluetooth™ and Java™ Technologiesin the Wireless Environment Michael T. Portwood, MS President & CEO Exuberance, LLC

2. Agenda • What is Bluetooth™ wireless technology • Technology Overview • Weaknesses • Strengths • What is Jini™ technology • Bluetooth, Jini™ technology, and the Wireless Environment • Conclusion • Question & Answer

3. What is Bluetooth™Wireless Technology Overview • Technology started by Ericsson • Named after 10th century Viking king(Harald Blatand) • A global wireless technology specification • “Always on” communication • Radio frequency based • Inexpensive • Intended for … • Portable devices • Desktop machines • Peripherals

4. Bluetooth™ Wireless Technology Details • Baseband protocols • Circuit switching • Packet switching • Uses 24 GHz globally available unlicensed ISM radio band • Effective range is 10 meters • Slow communication rate (721Kbps) • Small number of stations • 8 devices / piconet • 3 voice channels • Secure • Spread spectrum

5. Comparison ofWireless Technologies

6. Bluetooth™ Technology Strengths • Inexpensive • Superior range compared with IR • Omnidirectional, not requiring line of sight • Designed for ad hoc networking • Both voice and data channels • Well defined specification • Large number of implementing companies

7. Bluetooth™ Technology Weaknesses • Slow communication rate (1 Mbps) • Short networking range • Limited number of network connections • Large and complex specification(over 1000 pages)

8. Pure computing applications Presentations Card Scanning Synchronizing Data Remote Synchronization Printing Scanners Ubiquous Applications Communicator platforms Electronic Books Travel Home Entertainment System Applications In-vehicle systems Payment Systems Behavior Enforcement Collaboration Mobile E-commerce Bluetooth™ Wireless Technology Application Areas

9. What is Jini™ Technology • Jini™ Technology is designed for reliable distributed computing • Features • Simplicity • Reliability • Scalability

10. What Jini™ Technology is not • Jini is not a name server • Jini is not JavaBeans or Enterprise JavaBeans (EJBs) • Jini is not RMI • Jini is not a distributed operating system

11. Five Key Featuresof Jini™ Technology • Discovery • Lookup • Leasing • Remote Events • Transactions

12. Discovery • Discovery is the process of finding available lookup services • The Jini discovery protocol is the means by which Jini-aware code finds Jini communities

13. Jini™ Discovery Protocols • Multicast Request Protocol • Multicast Announcement Protocol • Unicast Discovery Protocol

14. Lookup • Lookup refers to the things that you can do with the lookup services that are determined via discovery • Lookup is similar to a name server • A process • Keeps track of all services that have joined a Jini community • Differs from a name server • Richer set of semantics than provided by traditional name server

15. Lookup Actions • Publishing a Service • Downloading a Proxy • Finding a Service

16. Leasing • Leasing refers to the process of allocating resources to community members • Leases are granted for a specified periodof time • Addresses problems with network fragility

17. Remote Events • Remote event is a technique for members of the community to notify one another of change • Asynchronous notifications • Consistent with events used in Java

18. Local Events Easier to deliver events in the order that they were generated Always delivered Cost of delivery is low The sender knows that it can safely deliver the event to the consumer Remote Events Difficult to deliver events in the order that they were generated Events may be undelivered Cost of delivery is high The sender does not know if it can safely deliver the event to the consumer Differences BetweenLocal and Remote Events

19. Transaction • A transaction is a unit of work • Transactions are used to complete complex units of work that may fail before complete • Two phase commit • Transactions are not heavily used in Jini™ applications

20. Transaction (cont.) • Transaction provide… • Atomicity • Consistency • Isolation • Durability

21. Jini™ Key Concept Overview • Discovery and Lookup establish a Jini community • Leasing helps Jini communities ensure stable, self healing, and resilient networks in spite of inevitable network failure • Events help Jini communities asynchronously communicate • Transactions help successfully complete complex operations and provide resolution for incomplete operations

22. How Bluetooth™ Complements Jini™ Technology • The key concepts found in Jini™ technology are found in Bluetooth™ wireless technology • Bluetooth™ technology is hardware what Jini™ technology is to software • Platform independent • A “standard” • Widely accepted

23. Bluetooth™ and Jini™ • Both Bluetooth and Jini work well together • Ad hoc networking • Hardware specification complements software specification, and visa versa • Broadly accepted technologies

24. Using Jini™ Technology

25. Additional Resources • Bluetooth™ Wireless Technology • www.bluetooth.com • Jini™ Technology • www.jini.org • www.javasoft.com

26. Conclusion • Bluetooth™ and Jini™ technologies compliment one another • Bluetooth™ technology excels at short duration ad hoc networking • Jini™ technology complements Bluetooth™ Wireless Technology • Many of the features of Jini™ technology can be found within the Bluetooth™ specification

27. Question & Answer

28. For Additional Information • World Wide Web site • www.exuberance4me.com • Presentation • Presentation notes • E-mail contact • portwood@exuberance4me.com