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3-1. Overview of Java EE web tier installation . The rich client is supported in both the two-tier architecture and four-tier architecture.

3-Tier Architecture

3-Tier Architecture

Prepared By

Channu Kambalyal

Page 1 of 19

3-Tier Architecture

Table of Contents

1.0 Traditional Host Systems........................................................................

................3

2.0 Distributed Systems........................................................................

........................4

3.0 Client/Server Model........................................................................

........................5

4.0 Distributed Client/Server Model........................................................................

......6

5.0 Inter-process Communication........................................................................

.........7

6.0 Benefits of the Client/Server Model........................................................................

8

7.0 Client/Server 2-Tier Architecture........................................................................

....9

8.0 3-Tier Client/Server Architecture........................................................................

..11

9.0 Middleware........................................................................

...................................13

10.0 Architectures in Discover Financial Services......................................................14

10.1 Current DAS Architecture........................................................................

........14

10.2 Migration from DAS-Tuxedo based to J2EE - WebSphere based system......15

10.3 Future WebSphere Based System..................................................................16

11.0 Architecture Trends........................................................................

....................17

11.1 Web Services, J2EE Connectors, Message Brokers, etc................................17

11.2 Business Process Management (BPM)...........................................................19

Page 2 of 19

3-Tier Architecture

1.0 Traditional Host Systems

A Central Processing System (Mainframe) provides all processing. Local Terminals are responsible for display and keyboard for user input and viewing capabilities. Local Terminals do not contain any intelligent processing capabilities.

Mainframe

Computer

Keyboard

Computer

Keyboard

Computer

Keyboard

Figure 1.0.1 Non-Client-Server System

File Server and retrieval processing provided by File Server Word Processing and spreadsheet processing provided by PC workstation.

Mainframe

Computer

Keyboard

Computer

Keyboard

Computer

Keyboard

Server

Server

Computer

Keyboard

Figure 1.0.2 Traditional Host System with LAN

Page 3 of 19

3-Tier Architecture

2.0 Distributed Systems

Distributed System

Both data and transaction processing are divided between one or more computers connected by a network, each computer playing a specific role in the system.

Replication

Ensures data at all sites in a distributed system reflects any changes made anywhere in the system.

Computer

Computer

Computer

Computer

Computer

Computer

Computer

Computer

Computer

Computer

Computer

Computer

server

Database

server

Database

Host Host D a t a U p d a t e s D a t a U p d a t e s R o u t in g t a s k s

RoutineTasks

Routine tasks

R o ut i n e ta s k s R o u ti n g T a s k s

Data Queries

Data Queries

Regional Centers

Corporate Data Centers

Data Replication

Figure 1.3. Distributed Data Centers

Page 4 of 19

3-Tier Architecture

3.0 Client/Server Model

Complements distributed systems

Responds to limitations found in the two host data processing models:

1. The traditional mainframe host model, in which a single mainframe

provides shared data access to many dumb terminals, and;

2. The local area network (LAN) model, in which many isolated systems

access a file server that provides no central processing power.

Provides integration of data and services

Application Processing provided by multiple tiers -

1. Database Server

2. Application Server

3. PC Workstation

server

Database

Application

Server

Application

Services

Computer

Computer

Computer

PC

Workstations

Database retrievel and updatingApplication LogicGUI presentation

Figure 3.1 Client/Server 3-Tier Model

Page 5 of 19

3-Tier Architecture

4.0 Distributed Client/Server Model

Application processing provided by all tiers of the network -

1. Mainframe

2. Application Servers

3. Workstations

Multiple databases to support distributed data requirements Supports high volume, load balancing and scalability (extendibility) Requires extensive network administration and application management.

Application

Server

Computer

Computer

Computer

PC

Workstations

Database retrievel

and updating

Application Logic

GUI presentation

Computer

Computer

Computer

PC

Workstations

Application

Server

Application

Server

Computer

Computer

Computer

PC

Workstations

Mainframe

Database

Datab ase

Figure 4.1 Distributed Client/Server Model

Page 6 of 19

3-Tier Architecture

5.0 Inter-process Communication

Basis for client/server computing

Client process communicates with server process

Each process performs separate functions

Data is passed between processes using IPC functions

Server Process

Client Process

Relational

Database

Get input from

user

Request

processing from server

Receive request

for processing

Retreive and

process data

Return values

Receive returned

values

Display output to

user

Inter-process

Communication

Pipes FIFOs

Message Queues

Semaphores

Shared Memory

Sockets

Streams

Figure 5.1 Inter-Process Communication

Page 7 of 19

3-Tier Architecture

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