Computer Network project on Back-End Application for Distributed Systems. The code we used are not included here.

1. Back-End Application
for Distributed System
TEAM MEMBERS:
1.HIMANSHU PANWAR
2.KARTHIKEYAN S
3.BONALA SANDEEP
4.ATIF IMAM
5.PRIYAM SURAI

2. Introduction:
 Recent trends in IT modernization, presents a growing need for
distributed Computing.
 The main aim of this project is to reduce the workload of an
individual data server.
 This is done by using a PROXY SERVER. The main object of which is to
handle the User request and to produce User response.
 The proxy server sends and receives the Data by means of http
request and http response from the data servers which are in
different locations.

3. Introduction:
 Normally all department data will be stored in a single server. Due to
this, single server will maintain all department request so the server
workload is increased .
 Secondly, a single failure would mean that the whole system is
down.
 So, to avoid this problem we are creating a web-enabled software,
which acts as proxy server for the clients who, have to access the
data from the database.

4. Proxy Server
M6M5M3M2M1
Internet Proxy server:

5. Our Proposed System:
 The System reduces the server workload of the data server by using
sub servers.
 Each Department Data should be in the same department server,
this helps in avoiding wastage of network capacity.
 All the servers are interconnected via the proxy server to be able to
provide data to the clients system.

6. Database Proxy server:

7.  Language : Java 1.7
 Front End Tool : HTML, Java
 Operating System : Linux
 Web Server : Tomcat 7.0
Software Requirements:

8. DISTRIBUTED COMPUTING:
 In the modern Internet World, Distributed Computing is one of the
key technology that play an important role.
 Distributed system requires that servers are running in different
address spaces, potentially on different hosts, to be able to
communicate with each other.
 Large amounts of data (several Terabytes) can be read and
processed in parallel, in a matter of seconds in this type of
computing.

9. Remote Method Invocation(RMI):
 RMI provides the mechanism by which the server and the client
communicate and pass information back and forth.
 Server creates a number of remote objects, and makes references
to those remote objects. The client gets a remote reference to one
or more remote objects in the server and then invokes them.
 In such systems, a local surrogate (stub) object manages the
invocation on a remote object.

10. JAVA VIRTUAL MACHINE JAVA VIRTUAL MACHINE
Application LayerApplication Layer
SERVER
SKELETON
Transport Layer
Remote Reference Layer
Proxy Layer
CLIENT
STUB
Proxy Layer
TCP
Transport Layer
Remote Reference Layer
Architecture of RMI:

11. Servlets Overview:
 Servlets extend the request-response-oriented servers, such as Java-
enabled Web servers.
 For example, a servlet can retrieve data from an HTML form and
apply the business logic and use it to update Product database.
 Applet is used in browsers. Similarly, Servlets is used for server. The
servlet API assumes nothing about the server’s environment or
protocol. So Servlet can be embedded in many different servers.

12. Client System
HTTP
Server
Servlet Product
Database
Servlets Overview:

13. Demo:

14. Thank You.