introducing the java ee platform

7/31/2019 Introducing the Java EE Platform

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Chapter:05


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Java EE6 basics


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Java enterprise edition 6 is latest javaplatform for develop enterpriseapplication.

Enterprise application is used forEnterprise Resource planning(ERP)which cutting age technology.

What is Java EE6.??!


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There are Three basic Layers ofarchitecture

1)The presentation layer :: User interface

2)The business logic layer :: Logic ofbusiness is implement here

3)The data storage and access layer :: Readand store data

Enterprise Architecture


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1)The Single tier architecture

2)The Two tier architecture

3)The Three tier architecture4)The Four tier architecture

Designing Ways of architecture


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The Single tier architecture consist of

the Presentation logic ,

Business logic andData access layer in single computingdevice.

The Single tier architecture


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Advantage Easy to manage and implementdata consistency

Data is stored at single location

DrawbacksCant handle multiple user at atime

Data sharing across origination is too difficult

task

Cont Single tier


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Consist of two layers

1) Business logic layer

2) Data access layer

In two tier architecture, application existing entirely in local

machine and database is located at another secure place in

organization.

At here, server just control traffic between application anddatabase.

A network architecture in which each computer or process on

the network is either a clientor a serverclient/server model

Two tier architecture


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Components

Clients

Servers

Communication Networks

Client

Server


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Applications that run on computers

Rely on servers for

Files

DevicesProcessing power

Example: E-mail client

An application that enables you to send andreceive e-mail

Clients are application

Client.??!


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Computers or processes that manage networkresources

Disk drives (file servers)

Printers (print servers)Network traffic (network servers)

Example: Database Server

A computer system that processes databasequeries

Servers are Resources

Servers..??!


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Communication Networks

Networks

Connect Clients

and Servers


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ClientServer Computing

Process takes place

on the server and

on the client

Servers

Store and protect data

Process requests from clients

Clients Make requests

Format data on the desktop

Client-Server Computing

Optimizes Computing

Resources


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Types of Servers

Application Servers

Audio/Video ServersChat Servers

Fax Servers

FTP Servers

Groupware Servers

IRC Servers

List Servers

Mail ServersNews Servers

Proxy Servers

Telnet Servers

Web Servers

Z39.50 Servers

From A to Z


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Development Issues:

Simple structure

Easy to setup and maintain

Performance:

Adequate performance for low to medium

volume environments

Business logic and database are physically close,

which provides higher performance.

Advantages of 2-tier


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Development Issues:

Complex application rules difficult to implementin database server requires more code for the

client Complex application rules difficult to implementin client and have poor performance

Changes to business logic not automaticallyenforced by a server changes require new clientside software to be distributed and installed

Not portable to other database server platforms

Drawback of 2-tier

introducing the java ee platform

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