1. An Introduction of Jini
Technology
Presenter: Carfield Yim, Gary Lam
Date: 31-Jul-2002
How can JINI Technology Boost Our
Business

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
Java
Internet-IDEF
Jini network technology
JavaSpaces
Tool Tool Tool 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
Layer
Architecture
Component
Architecture

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

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 http://hea-www.harvard.edu/~mnoble/tonic/doc/
 A benchmark result of Javaspace
http://sitar.anr.mcnc.org/JavaSpace_perf.html

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
http://www.j-spaces.com/
 IBM implementation of tuplespaces
http://www.almaden.ibm.com/cs/people/toby
 Database Persistence of JavaSpace
http://www.kalixia.com:8080/projects/XtremeSpace/index.html
 Commercial consultation of jini
http://www.pronoic.org/indexFrameSet.html

17. Reference Links
 http://java.sun.com/features/2000/09/jini.html
(Successful Story)
 http://www.onjava.com/onjava/p2p_java/
(O’rielly Jini resource)
 http://www.theserverside.com/patterns/thread.jsp?
thread_id=7158 (discussion thread to compare Jini and
J2EE)
 http://www.cdegroot.com/cgi-bin/jini (Jini wiki)
 http://jini.groupserve.com/ (Jini webservice)
 http://www.javaspaces.homestead.com/ (Javaspace paper)