1. JINI NETWORK TECHNOLOGY
Abstract: Jini network technology is an open
architecture that enables developers to create
network-centric services -- whether
Jini is a network architecture for the
implemented in hardware or software -- that
construction of the distributed systems are highly adaptive to change. Jini
where scale, rate of change and the technology can be used to build
complexity of the interactions within and adaptive networks that are scalable,
between networks are extremely important evolvable and flexible as typically required
and cannot be satisfactorily addressed by in dynamic computing environments. It is
existing technology. This technology based on java & TCP/IP..
provides a flexible infrastructure for
delivering services in a network and for History:
creating spontaneous interactions between Jini was introduced by Sun Microsystems
clients that use these services regardless of under the leadership of Bill Joy and Jim
their hardware or software implementations. Waldo on January, 1999. The first major
Examples ranges from business enterprises, step in bringing computing technology to the
world occurred when chips were first fitted
medical systems, financial applications, and onto circuit board in 1978.
battlefield implementations, to a Jini enabled Bill Joy, Sun’s co-founder and CEO,
car or a Smart House. It’s source code is describes five areas of research and
available at no cost. There are no fees of any development that led to Jini.
kind associated with the licensing and use of 1: Remote Method Invocation: alone it fails,
this technology. The Jini architecture is the but it works within Jini.
2: Object and information storage: figuring
only technology in the marketplace that
out how to store massive amounts of
moves Objects around the network and information and objects for a limited time is
relegates wire protocols to mere key to Jini.
implementation details. It’s vision is 3:Transactions: transactions systems must
network anything , anytime, anywhere !.Due allow immediate change.
to the simplicity of Jini architecture it 4:Distributed events: events are necessarily
clearly wins and will be. logical.
5: Distributed security: good security
enables trust. Joy points out that Jini
Introduction : resolved and brought together all these areas
of Java.
Jini™ (pronounced like genie) is a network
architecture for the construction of
distributed systems where scale, rate What is Jini?
of change and complexity of interactions
within and between networks are extremely Jini connection technology is based on a
important simple concept that “devices should work
together”. No drivers to find, no operating

2. systems issues, no weird cables and
connectors. It is designed to facilitate the
communication of cellular phones, pocket-
sized computers, pagers and other devices
over computer networks. In simple terms,
it’s really a Java program that serves as a
translator between the device and the rest of
the devices on the network .
JINI Technology KeyConcepts
 The jini technology makes a network
more dynamic The architecture of a single Jini system is
 It provides mechanism for devices to targeted to the workgroup. Members of the
join and detach from network federation are assumed to agree on basic
dynamically without the need for notions of trust, administration,
configuring each device identification, and policy. It is possible to
 Jini is also called “Apache River” federate Jini systems themselves for larger
 Jini addresses the problems of organizations.
distributed computing using a set of
simple interfaces and protocols 1:Services
 Jini enables spontaneous network of
software services to assemble into The most important concept within the Jini
working group of objects of architecture is that of a service. A
federations. service is an entity that can be used by a
 Jini builds on the Java 2 Platforms person, a program, or another service.
 Jini enables self healing when one or A service may be a computation, storage, a
more devices are removed from the communication channel to another
federations user, a software filter, a hardware device, or
 Jini is useful for hardware as well as another user.
software services. Services in a Jini system communicate with
each other by using a service
Purpose of Jini protocol, which is a set of Java interfaces.
 Enabling users to share services or
The set of such protocols is open
resources over a network
ended. The base Jini system defines a small
 Providing users easy access to the
number of such protocols which
resources anywhere on the network
define critical service interactions. For some
 Simplifying the task of building,
of these protocols we will provide
maintaining and altering a Network example implementations of services that
of devices , software and users. use them.
JINI Architecture 2:Lookup Service
Services are found and resolved by a lookup service.
Overview The lookup service is the central bootstrapping
mechanism for the system and provides the major

3. point of contact between the system and users of the before it is freed—either because the resource is
system. In precise terms, a lookup service maps no longer needed, the client or network fails, or
interfaces indicating the functionality provided by a the lease is not permitted to be renewed—then
service to sets of objects that implement the service. both the user and the provider of the resource
can conclude the resource can be freed. Leases
A service is added to a lookup service by a are either exclusive or non-exclusive.
pair of protocols called discovery and join--first
the service locates an appropriate lookup service 6:Transactions
(by using the discovery protocol), and then it A series of operations, either within a single service
or spanning multiple services, can be wrapped in a
joins it (by using the join protocol).
transaction. The Jini transaction interfaces supply
3:Remote Method Invocation a service protocol needed to coordinate a two-phase
commit. How transactions are implemented—and
(RMI) indeed, the very semantics of the notion of a
transaction—is left up to the service using the
Communication between services is accomplished interfaces.
using Java Remote Method Invocation (RMI). The
infrastructure to support communication between
services is not itself a service that is discovered and 7:Events
used but is, rather, a part of the Jini infrastructure. The Jini architecture supports distributed events.
RMI provides mechanisms to find, activate, and An object may allow other objects to register
garbage collect object groups. RMI also provides the interest in events in the object and receive a
infrastructure for multicast, replication, and the notification of the occurrence of such an event.
mechanisms for basic security and confidentiality. This enables distributed event-based programs to
Fundamentally, RMI is a Java-programming- be written with a variety of reliability and
language-enabled extension to traditional remote scalability guarantees.
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
Jini Service oriented
simplicity of the Jini system is enabled by this ability
to move code around the network in a form that is
Architecture
encapsulated as an object.
4:Security This section discusses the fundamental issue
The Jini security model is built on the twin of how services connect and register with
notions of a principal and an access the network in a SOA.
control list. Jini services are accessed on The basic networks elements in the Jini
behalf of some entity—the principal— architecture related to this issue are:
which generally traces back to a particular
 Lookup Service
user of the system. Services themselves may
 Service Proxy
request access to other services based on the
 Client
identity of the object that implements the
service. Jini Process
5: Leasing 1:Jini service discovers LUS and registers its
Access to many of the services in the Jini service
environment is lease based. A lease is 2:Jini client discovers LUS and locates the
a grant of guaranteed access over a time period. desired jini service
Each lease is negotiated between the user of the 3:Jini client receives java proxy for jinni
service and the provider of the service as part of service.
the service protocol: A service is requested for 4:Jini client uses proxy to contact JINI
some period; access is granted for service directly
some period, presumably taking the request
period into account. If a lease is not renewed

4.  Stub is Light weight and does not
carry any extra UI classes
 Adding support for new UI tech by
simply adding new builders at
service end
Unique Benefits
 Resiliency-Networks readily adapt to
changes in the computing
Discovery: Environment
 Integration-Allows fast , easy
Jini discovery is the process of adding a incorporation of Legacy ,current and
service to a jinni sy future network components.
 Licensing-jini network technology is
available free of charge With an
evergreen license.
Future Work
 Identifying and refining the UI
patterns
stem.  Security in jini:
 Who can access
Join services?
 Authentication
 Who can invoke what
services?
 Authorization
conclusion
The overall goal is to turn the
network into a flexible, easily
administered tool on which resources
Lookup: can be found by human and
computational clients. Resources can
be implemented as either hardware
devices, software programs, or a
combination of the two." You can
use the Jini Network technology to
create technology systems that are
scalable, evolvable, and flexible, in
Merits dynamic runtime environments in a
multifaceted way… Happy
 Dynamically builders can be loaded reading!!!!
with various kinds of Factory
settings
 Support for different Display
Technologies