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

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

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

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.

How Jini works? Adapted from Jini Technology Datasheet

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

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.

How JavaSpace Work

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

FYP Overview 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 Layer Architecture Component Architecture

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

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.

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

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

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

Reference Links (Successful Story) (Orielly Jini resource) =7158 (discussion thread to compare Jini and J2EE) (Jini wiki) (Jini webservice) (Javaspace paper)