Client Server models in JAVA

Agenda
 Introduction

 Logical Layers
 Presentation layer
 Application layer
 Data layer

 Client / Server Models
 Distributed presentation
 Remote presentation
 Distributed logic
 Remote data
 Distributed data

Introduction
 The Client-Server model is the most prevalent

model for distributed computing protocols.

 It is the basis of all distributed computing

paradigms at a higher level of abstraction.

 It is service-oriented, and employs a request-

response protocol.

Introduction
 Client
 A client is an individual user's computer or a user
application that does a certain amount of
processing on its own. It also sends and receives
requests to and from one or more servers for other
processing and/or data.

 Server
 A server consists of one or more computers that
receive and process requests from one or more
client machines. A server is typically designed with
some redundancy in power, network, computing
and file storage.

The Client / Server Model
 A server process, running on a server
host, provides access to a service.
 A client process, running on a client
host, accesses the service via the server
process.
 The interaction of the process proceeds
according to a protocol.
 An application based on the client-server
model is a client-server application.

Logical Layers

 In general, application software can be
divided into 3 logical layers:

 Presentation layer
 Application layer
 Data layer

Presentation Layer
 Presentation layer is responsible for
displaying the information and interacting with
the user .

 It must make the information available in a
suitable form to the user and must respond
appropriately to input from the user.

Application Layer
 Application layer processes
commands, makes logical decisions, performs
calculations, and coordinates the application

 It also moves and processes data between
the presentation layer and data layer

Data Layer
 Data layer refers to the management of
underlying databases

 It is responsible for storing and retrieving the
data according to the requirements of the
application layer.

Client Server Models
 Distributed presentation

 Remote presentation

 Distributed logic

 Remote data

 Distributed data

Distributed Presentation
 Only presentation management function
shared between client and server everything
else remains on the server
 Dummy terminals
 GUI placed in front of existing character
based interface, E.g. Windows 3.1.

Presentation Application Layer Data Layer
Layer

Client Side Server Side

Remote presentation
 Presentation manager entirely on client
 Application layer, data layer and data
manager on server
 Web applications where clients are Web
browsers, Unix through Putty

Distributed Logic
 Application is split into presentation layer and
data layer component
 All presentation management activities on
client
 All data management activities on the server

Remote Data
 Database manager resides on server
 Presentation management and data logic reside
on client
 Typical of client/server DBMSs
(DB2, Oracle, Informix, etc.)

Presentation Application Layer Data Layer
Layer

Client Side Server
Side

Distributed Data
 Portions of the database reside on client
 Portions of the database reside on server
 DBMS manages communication involved
 Limited implementation of full-fledged DDBMS
functionality

Client Server models in JAVA

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Client Server models in JAVA