1. An Introduction of Jini Technology
How can JINI Technology Boost Our Business
Presenter: Carfield Yim, Gary Lam
Date: Jul-2002

2. Outline What is Jini? What is the advantage of using Jini?
FYP Overview
How Jini help our final year project
Jini/Javaspace performance issue
Jini and WebService
Some Commercial Jini Products
Q & A

3. What is Jini?
Jini is a network technology that enables spontaneous assembly and interaction of services and devices on a network. [Adapted from Jini Network Technology datasheet]
Provide reliable services in an unreliable environment
This includes self-healing by leasing and transaction support for partial failure
Code mobility which is implemented by notion of Jini proxy

4. Jini's Infrastructure Discovery, Join and Lookup Protocol
Discovery - looking for a lookup service for registration or request of a service.
Join – A joining process of a service. Discovery should be performed beforehand. If joining process is succeed, a Jini proxy will be uploaded to the lookup service.
Lookup – search a service to be used. This involves locating and invoking the service. The matching is based on Java type concept. The service is located by downloading the Jini proxy of that service to the client.

5. How Jini works?
Adapted from Jini Technology Datasheet

6. Jini's Programming Model
Leasing
Lease grantor grants a period of time to the grantee. If there is no renewal after the lease expired, grantor will cancel the lease.
Remote Event
This is a distributed event environment.
Distributed Transaction
Implement the concept of Two-phase commit protocol

7. JavaSpace
The Java version of tuple space, origin from Linda project from Yale University
Provide a generic object broker for Jini service.
Thus, other than service distributed; data is also distributed.

8. How JavaSpace Work

9. Advantage of using Jini
JavaSpace provide a total decoupling protocol
Jini leasing mechanism provide a network wide Garbage Collection
Lookup and Discovery base on type but not name
Remote event and Distributed transaction simplify the distributed programming.

10. FYP Overview Layer Architecture Component Architecture
Java
Internet-IDEF
Jini network technology
JavaSpaces
Tool
Project Resource Management
Communication Facility
Network Resource Management
Util
Startup Facility
Tool Administration
ToolProxy Interface
API for JAR file
tools
API for
Remote Service
Client
Application
Component
Architecture

11. Collaborative UML Editor
ArgoUML
GEF
NSUML
ArgoUML
GEF
NSUML
IIDEF
Socket server

12. How Jini help our project
Javaspace help to prevent deadlock of server model
JavaSpace provide a network wide persistence support
Dynamic tool plug-in is facilitated by Jini's join , dicovery and lookup Protocol.
JavaSpace provides a loose-coupled communication.

13. Jini/Javaspace Performance Issue
A scientific Java-based tuplespaces benchmark package available to test the performance
A benchmark result of Javaspace

14. Jini and WebService
Similar service base concept, but one is base on XML and one is base on Java

15. From http://jini.groupserve.com/

16. Some Commercial Jini Products
Commercial JavaSpace implementation
IBM implementation of tuplespaces
Database Persistence of JavaSpace
Commercial consultation of jini

17. Reference Links
(Successful Story)
(O’rielly Jini resource)
(discussion thread to compare Jini and J2EE)
(Jini wiki)
(Jini webservice)
(Javaspace paper)