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Mobile agents in a distributed multimedia dabase system(synopsis)Document Transcript
MOBILE AGENTS IN DISTRIBUTED MULTIMEDIA
The size of networks is increasing rapidly and this fact is not
straitened to the internet alone. Many intra and inter–organization
networks are affected by this trend, too. A side effect of this growth is
the increase of nework traffic. This development leads to new
challenges and we have to think about new technologies. Mobile agent
systems are one answer to these challenges.Mobile agents are an
emerging technology attracting interest from the fields of distributed
systems, information retrieval, electronic commerce and artificial
A mobile agent is an executing program that can migrate
during execution from machine to machine in a heterogeneous
network. On each machine, the agent interacts with stationary service
agents and other resources to accomplish its task, returning to its
home site with a final result when that task is finished. Mobile agents
applications. By moving to the location of an information resource, the
agent can search the resource locally, eliminating the transfer of
intermediate results across the network and reducing end-to-end
latency. Mobile agents are goal-oriented, can communicate with other
agents, and can continue to operate even after the machine that
launched them has been removed from the network.
The mobile feature enables the agent to travel to the host where
the data are physically stored. This is obviously of great interest in a
distributed multimedia database systems where we have in most cases
large binary objects. This Project integrates mobile agent technology in
a distributed database system. The advantage of this approach is the
combination of mobile agent features (e.g. autonomy, mobility,
enhancement of functionality) and database services such as recovery,
transaction handling, concurrency and security. This projects aims at
distributed multimedia database using mobile agents based on host
database which will provide the result to the user upon request.
Recent times have seen exciting new developments in
computer networking. Applications like the World Wide Web have
made computer networks such as the Internet available to users
Information servers offering all sorts of interesting data are cropping
up, and, as researchers are trying to find ways of reliable electronic
payment, the net will soon be important as a ‘virtual marketplace’.Yet
the sheer amount of data available to users in such a network will be
difficult to handle. How will they be able to locate the information they
need? How are they going to find the best offer for some service they
One possible solution brought forward to help in this
situation consists of ‘mobile agents’ - autonomous programs that move
about the network on behalf of their owners while searching for
information, negotiating with other agents, or even concluding
business deals Agents can be loosely defined as programs that assist
people and act on their behalf.Agents are programs that can act
Transportable (or "mobile") agents can migrate from
host to host across the network and interact with other agents. Mobile
agents are an emerging technology attracting interest from the fields
of distributed systems, information retrieval, electronic commerce and
The concept of mobile agents implies a lot more. It is
often considered as a new programming and architecture development
paradigm, i.e. as the next step after the client/server and objectoriented programming paradigms.Mobile agent technology has been
the subject of much attention in the last years due mainly to the
availability of technologies and standards for platform integration such
as CORBA, JAVA RMI and OMG MASIF.
Review of Existing model & the proposed model
Existing Model is local System computation i.e. each system , where
the data is stored should have separate database Management System
or the application takes lot of time and CPU cycle to retrieve
Information ( Multimedia Data ) .
To better understand mobile agents and their behavior, we must first
look briefly at traditional network architectures. The following figure
illustrates the network behavior of a typical client/server application.
FIGURE1.6 The typical client/server application communication
A client/server application typically consists of two pieces: a client
piece and a server piece. Often, the client and server pieces are on
separate machines and they communicate over a common network.
When the client needs data or access to resources that the server
provides, the client sends a request to the server over the network.
The server in turn sends a response to the request. This “handshake”
occurs again and again in a traditional client/server architecture. Each
request/response requires a complete round trip across the network.
The Proposed System is using Agents can able to do the same
Application with less amount of Time and CPU cycle. Now compare the
client/server architecture described to the mobile agent architecture
illustrated in the next figure.
FIGURE1.7 The mobile agent paradigm(Architecure)
Just as in the client/server architecture, there is a client piece and a
server piece. The difference lies in how the two communicate. When
the client in the mobile agent architecture needs data or access to a
resource that the server provides, the client doesn’t talk to the server
over the network. Instead, the client actually migrates to the server’s
machine. Once on the server’s machine, the client makes its requests
of the server directly. When the entire transaction is complete, the
mobile agent returns home with the results.
(Or) Java Swing / AWT
Server Agent (SA)
Java, Jini, JMF
Query Agent (QA)
Java, Jini, JMF
Database Agent (DA) Java, Jini, JMF
TABLE 2.1 MODULES INVOLVED THE PROJECT
2.5 DEVELOPEMENT PHASES:
The Project is Functionally divided into 4 modules. They are:
Client Application (CA)
In the Client Application, there is a Client Agent, for communicating
with the Server Agent (SA). User request will be received from the
Client Agent’s user interface and forwarded to the Server Agent (SA).
The Client Agent is also responsible for presenting the query results to
the user. The Client Application supports Agents with the following
missions (1) search MPEG audio files and MPEG video files by user’s
specification. (2) stream and play audio files and video files on a
remote location. It can decode two types of file formats including
MPEG I Layer III audio and MPEG I video.
Server Side Agent (SA)
The SA is responsible for dispatching client’s requests to the Query
Agent (QA) or Database Agent (DA). If the client requests is a query it
will be forwarded to the Query Agent or if it is someother, it will be
based on the clients request.
Query Agent (QA)
The Query Agent (QA) is responsible for making query to find out the
site containing the requested multimedia data.
Database Agent (DA)
If a client’s request is a list of multimedia data, it will be forwarded to
the Database Agent (DA) for indexing and updating the multimedia
meta-data database. Moreover the Database Agent (DA) will be asked
to update the database if a multimedia data is removed from a
Metadata represent information about the data in individual databases
and data repositories. They may represent relationships between
individual media objects.
extracted using various mappings/extractors associated with the
various types of digital data.
Hardware & Software Requirements
1. Pentium III Processor
2. 128 MB RAM ( or More )
3. Java Virtual Machine
4. Data Base Software
5. JINI Frame Work