[PDF] [PDF] N-tier Architectures

[PDF] N-tier Architecture Improves Scalability - cadeirasisctept

This additional layer has the effect of decoupling business logic from presentation and database functions, both physically and in the software architecture The 

[PDF] Creating 3-tier Architecture in Visual Studio

3-tier/layer Architecture 4 Presentation Why 3-Tier (N-Tier Architecture?) • Flexible Application tier (business logic, logic tier, data access tier, or middle tier)

[PDF] Implementing N-Tier Architecture for Improvement in - IJERT

The simplest of n tier architecture is 3-Tier which typically contains following software component layers listed from top level to low level: presentation layer, 

[PDF] What is N-Tier? - Magadh University

A diagrammatic representation of an n-tier system depicts here – presentation, application, and database layers N Tier Architecture Diagram These three layers 

[PDF] WEB APP ARCHITECTURES:

Business/Logic □ Data □ N-tier architectures try to separate the components into different tiers/layers □ Tier: physical separation □ Layer: logical separation  

Cloud Deployments: Is this the End of N-Tier Architectures?

Via this model the presentation, the application processing (business logic) and end layers, N-tier architecture supports a more standardized, building block 

Understanding Application Architecture: An Overview

Not all applications need to use an n-tier architecture just because it is the will see that the business logic is the most important component of any application

[PDF] N-tier Architectures

N-tier Architectures DB3 - 2005 2 business logic ○ interfaces Logic Business Logic Monoliths Client Server Period 3 tier Period N-tier Period DB3 - 

A Web-Based Chinese Chess Xiang Qi using n-tier Architecture Model

The system applies the MVC (Model View Controller) concept and created four layers in the architecture which are presentation layer, business layer, data layer  

[PDF] Research and Application of the Four-tier Architecture Jiexian Cao

may have to increase the corresponding code in the business logic layer and data The four layers of four-tier architecture are presentation layer (PL), data 3) Using the four-tier architecture design patterns can guarantee the multi-team 

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N-tier Architectures

DB3 - 20052In this section...

?Iadh"s been blasting you with SQL to a high standard! ?Look at applications of SQL in programming languages, in particular ?JDBC, SQLj ?PHP ?Also other crucial aspects of data intensive systems ?transactions ?First, though, in this lecture ?attempt to fit all this in context - Enterprise computing DB3 - 20053What characteristics do we want our Software to have (PSD...?) ? ?Easily Developed ?Speedily Developed ?Agile ?Easily Understood ?Easily Maintained ?Easily Modifiable ?Reliable DB3 - 20054Major components in Enterprise computing ?Basically ?data ?business logic ?interfaces ?But this can be/is implemented in more layers often.

DB3 - 20055The Mesozoic Era

The dinosaurs and the mammals appeared during the Triassic period, roughly 225 million years ago. The dinosaurs went extinct 65 million years ago

DB3 - 20056Computer Systems Timeline

Monoliths

Client Server

Period

3 tier

Period

N-tier

Period

Legacy Era

Component-Based

Era NOW

Web Services

Era

DB3 - 20057In the beginning....

Enterprise

Salaries

Orders

Accounts

Monoliths

Client Server

Period

3 tier

Period

N-tier

Period

DB3 - 20058Monolithic Era

?Single chunks of code ?Data Storage embedded ?UI embedded ?System rules embedded ?No inter-system dependencies

Monoliths

Client Server

Period

3 tier

Period

N-tier

Period

DB3 - 20059Monolithic Era - reasons for existence

?Mainframe platforms ?Few or no tools existed ?Off-the-shelf databases did not yet exist ?Simple and easily understood ?Natural way of implementing many business processes

Monoliths

Client Server

Period

3 tier

Period

N-tier

Period

DB3 - 200510Monolithic Era - reasons for extinction

Monoliths

Client Server

Period

3 tier

Period

N-tier

Period

DB3 - 200511Evolution - 1970s Client Server Era

Enterprise

Server

Client

Client

Client

Monoliths

Client Server

Period

3 tier

Period

N-tier

Period

DB3 - 200512Client - Server

Client

Server

Ports (1-9999)

Address

Another

Server

Monoliths

Client Server

Period

3 tier

Period

N-tier

Period

DB3 - 200513Addressing - the DNS

rootoz uk comoz ukcom ac.uk co.ukac co gla.ac.uk strath.ac.uk gla.ac.uk strath.ac.uk

Monoliths

Client Server

Period

3 tier

Period

N-tier

Period

DB3 - 200514Client - Server

Client

Server

Address

Another

Server

sockets Port Port

Server Protocol

Monoliths

Client Server

Period

3 tier

Period

N-tier

Period

DB3 - 200515Client - Server

Client

Server

Address

Another

Server

sockets

Another

Client

Server ProtocolPortPort

Monoliths

Client Server

Period

3 tier

Period

N-tier

Period

DB3 - 200516Client-Server Era - Reasons

?Advent of PCs ?Availability of off-the-shelf DBMSs ?Advent of RAD Tools ?Acceptable networking facilities ?Distributed Processing load across clients ?Visualisation at the client level and data processing at the server level

Monoliths

Client Server

Period

3 tier

Period

N-tier

Period

DB3 - 200517Whence the business logic?

?At the client? ?Yes, usually - hence Fat Client ?Difficult to deal with maintenance and change ?At the server? ?Could store functions in the DBMS but it overloads the server ?The client and server are tightly coupled.

Monoliths

Client Server

Period

3 tier

Period

N-tier

Period

DB3 - 200518Client-Server deficiencies

?Difficult to reuse client with different data sources ?Difficult to reuse server on different front-end ?Development tools were poor ?Developers were contaminated by the monolithic culture

Monoliths

Client Server

Period

3 tier

Period

N-tier

Period

DB3 - 200519Developers" myopia

?No concept of separating out business logic ?Focus on reuse OF CODE ?The first generation tools were impressive to people who had had notools

Monoliths

Client Server

Period

3 tier

Period

N-tier

Period

DB3 - 200520Next step?

Client-Server

Monoliths?

DB3 - 200521Advancing Upwards

Enterprise

Server

network

DB3 - 2005221990s - what next?

Client-Server 2 tiers

Monoliths 1 tier3 tiers!

DB3 - 2005233 tiers!

Enterprise

Server

Server

ServerClient

network

Business

Logic

Business

Logic

Business

Logic

Monoliths

Client Server

Period

3 tier

Period

N-tier

Period

DB3 - 200524Cooperating Collections of Components

User interface Data

Business

logic

Monoliths

Client Server

Period

3 tier

Period

N-tier

Period

DB3 - 200525Server-Side Processing

Server

ComponentApplication Server

Server Machine

Monoliths

Client Server

Period

3 tier

Period

N-tier

Period

What is needed

to make this run efficiently?

DB3 - 200526Advantages of 3 tier

?Loosely coupled ?Agile Software ?Use of pre-assembled parts ?Promotes reuse of parts ?Eases maintenance ?Ease of versioning

Monoliths

Client Server

Period

3 tier

Period

N-tier

Period

DB3 - 200527Interconnection?

?Customised connection would be too difficult ?Use standardised data bus like CORBA ?So MxN connection is simplified to 1x1 connection

Monoliths

Client Server

Period

3 tier

Period

N-tier

Period

DB3 - 200528Data Bus Concept

Client

Server

ObjectClient

Object Request Broker

Monoliths

Client Server

Period

3 tier

Period

N-tier

Period

DB3 - 200529Limitations

?Technical ?Size of executable ?Speed of execution ?Cultural ?Updating legacy systems to 3 tier is not always acceptable to people used to monoliths

Monoliths

Client Server

Period

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