08-10-2010, 11:12 AM
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Introduction to Jini
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. 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 for spontaneously forming networks of heterogeneous equipment to share code and configurations transparently. And Jini has the potential to radically alter our use of computer service networks, since it allows and encourages new types of services and new uses of existing networks.
What is Jini
Jini is a set of specifications that enables services to discover each other on a network and that provides a framework that allows those services to participate in certain types of operations. For an instance, take a Jini-enabled laptop into a Jini-enabled conference room and the laptop automatically be able to find and use the services of the conference room such as the laptop will automatically find the printer inside the room, seamlessly download any drivers required by the printer and will send its output to the printer. But Jini is not about hardware and devices. Jini is all about services.
A Jini-enabled printer provides a print service to the network; that the particular service is provided by a piece of hardware is irrelevant. There may be a software service on the network that also provides the same print service by accepting print requests, rasterizing them and emailing the rasterized images to a distant recipient. There are many services that are only software.
Thus Jini not only allows hardware and applications to interact but also allows this interaction to happen in a dynamic, robust way. Jini software also gives network devices self-configuration and self-management capabilities. It lets devices communicate immediately on a network without human intervention. And Jini has the potential to radically alter our use of computer service networks, since it allows and encourages new types of services and new uses of existing networks. These networks are self-healing in that devices that leave the network for any reason, such as machine crashes or power surges, do not affect the remaining devices' operation. A Jini client that loses contact with a server can recover and continue processing. It is precisely these features that make Jini technology ideal for embedded systems in a dynamic environment. But network plug-and-play capabilities and self-configuration are also attractive for enterprise systems.
Jini Advantages
Jini developers intended Jini technology as a sophisticated platform on which to develop network-aware applications. Jini technology provides users access to resources located anywhere on the network. Both user and resource locations can change without affecting the application. Users, devices, and resources can join and leave the network without manual reconfiguration. Jini developers used the Internet as a model for developing their product and sought to take advantage of the Internet's advantages in terms of reliability, scalability, maintenance and administration, and security. Jini is freed from having to deal with specific operating system and hardware requirements by Java technology, while Jini itself frees the client and service to interact without having to concern themselves withe the particulars of the network.
Jini Infrastructure
Jini is a distributed computing framework. Hence the participants in the Jini network are called clients and servers. A server has an interface, which is the API that it presents to the outside world. This interface is called the service interface or the service. A server is hence an implementation of a service.
Jini software runs on top of Java Virtual machine and will work in any IP-based network of machines with Java VMs. It is based entirely on Java and depends on Java to function. Jini technology presupposes the existence of network connecting devices and Jini-enabled communicate with each other over this network. A Jini network contains communities, or federations, or clients and services. A Jini service joins a federation, to share its service with clients. A Jini client joins a federation to gain access to services. Federations are dynamic constructs, appearing and disappearing based on the demands of Jini devices.
Introduction to Jini
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. 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 for spontaneously forming networks of heterogeneous equipment to share code and configurations transparently. And Jini has the potential to radically alter our use of computer service networks, since it allows and encourages new types of services and new uses of existing networks.
What is Jini
Jini is a set of specifications that enables services to discover each other on a network and that provides a framework that allows those services to participate in certain types of operations. For an instance, take a Jini-enabled laptop into a Jini-enabled conference room and the laptop automatically be able to find and use the services of the conference room such as the laptop will automatically find the printer inside the room, seamlessly download any drivers required by the printer and will send its output to the printer. But Jini is not about hardware and devices. Jini is all about services.
A Jini-enabled printer provides a print service to the network; that the particular service is provided by a piece of hardware is irrelevant. There may be a software service on the network that also provides the same print service by accepting print requests, rasterizing them and emailing the rasterized images to a distant recipient. There are many services that are only software.
Thus Jini not only allows hardware and applications to interact but also allows this interaction to happen in a dynamic, robust way. Jini software also gives network devices self-configuration and self-management capabilities. It lets devices communicate immediately on a network without human intervention. And Jini has the potential to radically alter our use of computer service networks, since it allows and encourages new types of services and new uses of existing networks. These networks are self-healing in that devices that leave the network for any reason, such as machine crashes or power surges, do not affect the remaining devices' operation. A Jini client that loses contact with a server can recover and continue processing. It is precisely these features that make Jini technology ideal for embedded systems in a dynamic environment. But network plug-and-play capabilities and self-configuration are also attractive for enterprise systems.
Jini Advantages
Jini developers intended Jini technology as a sophisticated platform on which to develop network-aware applications. Jini technology provides users access to resources located anywhere on the network. Both user and resource locations can change without affecting the application. Users, devices, and resources can join and leave the network without manual reconfiguration. Jini developers used the Internet as a model for developing their product and sought to take advantage of the Internet's advantages in terms of reliability, scalability, maintenance and administration, and security. Jini is freed from having to deal with specific operating system and hardware requirements by Java technology, while Jini itself frees the client and service to interact without having to concern themselves withe the particulars of the network.
Jini Infrastructure
Jini is a distributed computing framework. Hence the participants in the Jini network are called clients and servers. A server has an interface, which is the API that it presents to the outside world. This interface is called the service interface or the service. A server is hence an implementation of a service.
Jini software runs on top of Java Virtual machine and will work in any IP-based network of machines with Java VMs. It is based entirely on Java and depends on Java to function. Jini technology presupposes the existence of network connecting devices and Jini-enabled communicate with each other over this network. A Jini network contains communities, or federations, or clients and services. A Jini service joins a federation, to share its service with clients. A Jini client joins a federation to gain access to services. Federations are dynamic constructs, appearing and disappearing based on the demands of Jini devices.
