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Nandakumar JINI Jini is a layer atop JAVA like JFC or JDBC. Jini basically offers api’s for programming in a distributed environment. The Jini project was initiated to extend Java for what it was originally developed for. JINI… Jini is not a acronym for juniper internet communications inc. (as they claim) Jini is a new computing paradigm Java was actually developed for running on embedded applications before it became a programming language for the web. Vision of the Jini Project The design group had the following vision in mind: “Network Anything Anytime Anywhere” What Jini is not !! 1. 2. 3. 4. It is not a name server. It is not Java Beans or EJB . It is not just RMI. It is not a distributed Operating System. What ties JINI with DS ? Jini is used to create a platform where in different diverse systems all can “talk” to each other. It signals a change from a world in which devices are just networked into one in which devices join together to form a true distributed system. Jini design goals: Software infrastructure should be incredibly robust. Must be really Plug & Play. The software system for the internet must be evolvable. What we are actually looking for: Jini was developed for multi process – multi devices environment. We are basically looking for different devices interacting to provide different results , what we require is a generic platform to provide capabilities for interactive programming. Jini development: Jini can be considered as an extension to RMI.( we dealt this in the Cookie server /client model). rmi RMI-remote method invocation provides a way for Java applications, running on different JVM’s/host computers to “talk” to each other. Jini’s Key Concepts 1. 2. 3. 4. 5. Discovery. Lookup. Leasing. Remote Events. Transactions. Jini To work requires …. 3 major components Service Client Jini environment –rmi, web server, lookup service. Service Devices that can share their capabilities with other devices. Device requirements a. memory & cpu. b. Connection to network. E.g. TV, Microwave,Printer,PC,Software Client A device that uses services Requirement Memory & CPU Connection to Network E.g. PDA, WAP Phone, PC, Coke Machine The Jini environment Service Provider Service Consumer Jini Lookup Service How does it work? 1.create the jini environment-lookup server online. 2.services discover, join and register on lookup servers. 3.clients discover and find matching and downloadable services, then start using them. Creating The jini environment: 1.run a http server (jini provides a simple but efficient one). 2.run a RMI daemon (exists on Java 2). 3.run a lookup server (supplied with the reggie.jar files in jini){ comes with the jini env} Running the environment command lines: http server: java -jar java archive /usr/local/Java/jini1_1/lib/tools.jar. jini’s http -port 8087 -dir /usr/local/Java/jini1_1/lib the server’s root directory -verbose& Rmi daemon: rmid -J-Dsun.rmi.activation.execPolicy=none -port 1100 -log /tmp/rmid_log& rmi log directory-recvering... SAMPLE PROGRAM OUTPUT! From the service: >discovered a lookup service! >set serviceID to e91bb-53434-ty7554 From the client: >Got matching service. >Its message is: Hello, world! Advantages & shortfalls Uses java as the base. Support with all available java tools. Not all that easy to code. Uses RMI which adds its overhead.