JINI TECH PPT
- 1. JINI TECHNOLGY Submitted by- KAKI REDDY DIVYA (10D41A1207) Submitted to- Department of INFORMATION TECHNOLOGY SRI INDU COLLEGE OF ENGG. AND TECHNOLOGY
- 2. INTRODUCTION • Jini is a simple set of Java classes and services that has the potential to create its own revolution because it allows technology to be exploited in new ways. • Jini was created by Sun Microsystems as software for networking in all sorts of electronic devices, services, and applications. • Jini lets them join up easily, seamlessly and gracefully - it is a sort of plug-and-play capability.
- 3. INTRODUCTION ( cont… • Jini technology is one of the most important attempts to fulfill the high requirements of heterogeneous and fast changing network design and implementation issues. • Based on the java programming language , Jini technology tries to deal with very complex network issues like partial network failures. • Jini offers relatively lightweight solutions for issues which cannot be covered by the traditional distributed system.
- 4. WHAT is JINI?? • Jini technology provides a simple infrastructure for providing services in a network. It enables spontaneous interactions between applications. • Network of services connected together dynamically. • Services can join or leave the network in a robust manner. Clients can rely upon the availability of visible services.
- 5. GOALS • Network plug-and-play. • Spontaneous networking. • Service-based architecture. • Simplicity. • Reliability.
- 6. Purpose of Jini • Federate groups of hardware and/or software components into a single, dynamic, distributed system. • The resulting federation provides the simplicity of access and ease of administration. • It guarantees the reliability and scalability of the whole system.
- 7. Key Concepts of Jini The main concepts of Jini and their relationships are described in the conceptual model. • Jini services. • Service Item. • Service ID. • Service proxy. • Service attribute, etc…
- 9. 1.1 Jini Service • A Jini service is an entity that can be used by a person, a program or another service. • A service may be a computing program, a hardware device or a component of the Jini system. • A Jini system consists of services that can be collected together for the performance of a particular task.
- 10. 1.2 Service Item • A service item is an object that represents this service in the Jini federation. • A service item is composed of a service identifier, a set of attributes and a proxy object.
- 11. 1.3 Service ID • A service identifier is a global unique identifier for a service. • This identifier is assigned by a lookup service (further detailed) the first time a service registers in the Jini federation.
- 12. 1.4 Service Proxy • A service proxy is an object that encapsulates the mechanisms that a service and a client communicate with. • When a client system looks for a service it receives from a lookup service a proxy object enabling the communication with the requested service.
- 13. 1.5 Service Attribute. • Service attributes represent relevant characteristics of a service; relevant features that distinguish one service from another in ways that are not reflected by the type of the proxy. • In this way, Jini clients can perform rather complex searches of services based on these attributes.
- 14. 1.6 Jini Group • Jini services are structured within groups. A group usually represents a rather small (typically the size of a workgroup) community of services. • The default group is called “public”. Group names are only unique within the naming space of a network.
- 15. 1.7 Jini Federation. • The Jini federation is an abstract concept that represents the full set of communities (or groups) of Jini Services
- 16. 1.8 Jini Client • A Jini client is a system that uses a Jini service. • A Jini client can eventually be another Jini service or just another entity. In an ideal Jini federation there would be nothing but Jini services that collaborate to perform certain tasks.
- 17. 1.9 Lookup Service. • Services are found and resolved by a Jini Lookup Service (JLS). • The JLS is the central bootstrapping mechanism for the system. It provides the major point of contact between services.
- 18. Key MECHANISMS of Jini • Key mechanisms of Jini technology are: Discovery Protocol. Join Protocol. Lookup Protocol. Leasing. Remote Events. Transactions.
- 19. 2.1 Discovery Protocol • The protocols that govern the acquisition of these references are known as the discovery protocols. • A Jini discovery protocol is the means by which Jini entities find Jini communities.
- 20. 2.2 Join Protocol • A Jini entity, using references to JLSs obtained during the discovery process, can advertise the services it offers. • The join protocol regulates how services join Jini communities.
- 21. 2.3 Lookup Protocol. • A Jini entity, using a reference to a JLS obtained during the discovery process, can search all the service items provided by this JLS to find services of interest.
- 22. 2.4 Leasing. • In distributed systems, there are situations when different parts of a cooperating group are unable to communicate - either because one of the members has crashed or because the connection between the members of the group has failed. • To deal with these problems, the notion of lease was introduced.
- 23. 2.5 Remote Events. • Jini entities occasionally need to be notified when certain interesting changes happen in their environment. • To do that, Jini has the notion of remote events.
- 24. 2.6 Transactions. • Transactions provide a way to group a series of related operations so either all the operations succeed, or all the operations fail. • The transaction protocol must be implemented by each service.
- 25. USERS Active users of Jini technology in the present days are RAILWAY SYSTEMS.
- 26. Conclusion • The use of Jini technology simplifies the development of distributed systems because Jini forces distributed systems developers to deal with the network in early stages of development.
- 27. THANK YOU
- 28. Queries