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Section: AR The Jini Architecture Specification
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AR21 Key Concepts The purpose of the Jini architecture is to federate groups of devices and software components into a single, dynamic distributed system The resulting federation provides the simplicity of access, ease of administration, and support for sharing that are provided by a large monolithic system while retaining the flexibility, uniform response, and control provided by a personal computer or workstation The architecture of a single Jini system is targeted to the workgroup Members of the federation are assumed to agree on basic notions of trust, administration, identification, and policy It is possible to federate Jini systems themselves for larger organizations
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AR211 Services
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The most important concept within the Jini architecture is that of a service A service is an entity that can be used by a person, a program, or another service A service may be a computation, storage, a communication channel to another user, a software filter, a hardware device, or another user Two examples of services are printing a document and translating from one word processor format to some other Members of a Jini system federate to share access to services A Jini system should not be thought of as sets of clients and servers, users and programs, or even programs and files Instead, a Jini system consists of services that can be collected together for the performance of a particular task Services may make use of other services, and a client of one service may itself be a service with clients of its own The dynamic nature of a Jini system enables services to be added or withdrawn from a federation at any time according to demand, need, or the changing requirements of the workgroup using the system Jini systems provide mechanisms for service construction, lookup, communication, and use in a distributed system Examples of services include: devices such as printers, displays, or disks; software such as applications or utilities; information such as databases and files; and users of the system Services in a Jini system communicate with each other by using a service protocol, which is a set of interfaces written in the Java programming language The set of such protocols is open ended The base Jini system defines a small number of such protocols that define critical service interactions
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Services are found and resolved by a lookup service The lookup service is the central bootstrapping mechanism for the system and provides the major point of contact between the system and users of the system In precise terms, a lookup service maps interfaces indicating the functionality provided by a service to sets of objects that implement the service In addition, descriptive entries associated with a service allow more fine grained selection of services based on properties understandable to people Objects in a lookup service may include other lookup services; this provides hierarchical lookup Further, a lookup service may contain objects that encapsulate other naming or directory services, providing a way for bridges to be built between a Jini lookup service and other forms of lookup service Of course, references to a Jini lookup service may be placed in these other naming and directory services, providing a means for clients of those services to gain access to a Jini system
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O'Reilly Network Safari Bookshelf Jini Specifications, The, Second Edition A service is added to a lookup service by a pair of protocols called discovery and join first the service locates an appropriate lookup service (by using the discovery protocol), and then it joins it (by using the join protocol)
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AR213 Java Remote Method Invocation (RMI)
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Communication between services can be accomplished using Java Remote Method Invocation (RMI) The infrastructure to support communication between services is not itself a service that is discovered and used but is, rather, a part of the Jini technology infrastructure RMI provides mechanisms to find, activate, and garbage collect object groups Fundamentally, RMI is a Java programming language enabled extension to traditional remote procedure call mechanisms RMI allows not only data to be passed from object to object around the network but full objects, including code Much of the simplicity of the Jini system is enabled by this ability to move code around the network in a form that is encapsulated as an object
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