An Introduction of Jini Technology

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An Introduction of Jini Technology
How can JINI Technology Boost Our Business

• Presenter Carfield Yim, Gary Lam
• Date 31-Jul-2002

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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

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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

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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.

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How Jini works?
Adapted from Jini Technology Datasheet
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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

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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.

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How JavaSpace Work
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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.

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FYP Overview
Layer Architecture
Component Architecture
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Collaborative UML Editor
IIDEF
Socket server
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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.

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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

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Jini and WebService

• Similar service base concept, but one is base on
  XML and one is base on Java

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From http//jini.groupserve.com/
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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.com8080/projects/XtremeSpace/i
  ndex.html
• Commercial consultation of jini
  http//www.pronoic.org/indexFrameSet.html

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Reference Links

• http//java.sun.com/features/2000/09/jini.html
  (Successful Story)
• http//www.onjava.com/onjava/p2p_java/ (Orielly
  Jini resource)
• http//www.theserverside.com/patterns/thread.jsp?t
  hread_id7158 (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)