1 lecture 3 major architectural models 4 + 1 view (cont’d) architectural models/patterns...

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Lecture 3 Major Architectural Models

• 4 + 1 View (Cont’d)

• Architectural Models/Patterns

• Architecture Case Study

Software Architecture & Design Pattern

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Logical View

Physical ViewProcess View

Development View

End user

System EngineerIntegrator

Programmers& software managers

Scenarios


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Logical View

Viewer: End-userConsiders: Functional requirements- What the system should provide in terms of services to its users. Notation: Class diagramTool: CASE tool


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Logical View – class view


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Logical View – sequence diagram


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Logical View – communication diagram


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Logical View – state diagram


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Development View

Viewer: programmers and managers

Considers: software module organization

Style: layered style

Notation: UML


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Process View

Viewer: integrator

Considers: Non - functional requirements

(concurrency, performance, scalability)

Style: several styles


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Process View example


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Physical View

Viewer: system engineer

Considers: non-functional requirements regarding

hardware (computing node, network)

Notation: costumed


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Physical View example


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Scenarios

Viewer: all users of other views and evaluators.Considers: system consistency, validityNotation: UML/Use CaseTool: CASE tool


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Scenarios – Use Case diagram


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Software Architectural Model• structural model• Use Case model• component model• class model• communication/interaction model• deployment model

Software Development Model• development model• development process


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Structural Model – layered architecture

Hardware

Domain-SpecificServices

CommonMiddleware Services

DistributionMiddleware

Host InfrastructureMiddleware

Applications

O/S and Protocols


17Hardware (CPU, Memory, I/O)Hardware (CPU, Memory, I/O)

Networking InterfacesNetworking Interfaces

Operating SystemOperating System

Middleware InfrastructureMiddleware Infrastructure

Mission Computing ServicesMission Computing Services

GPS IFF FLIR

HUDNav WTS Air

Frame

Publishers

Subscribers

push(event)

push(event) Event Channel

Broker


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Use Case Model – Use Case diagram


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Component Model – component diagram


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Class Model – class diagram


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Communication/Interaction Model


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Class Libraries

Frameworks

Macro-levelMeso-levelMicro-level

Borrow caller’s thread

Inversion of control

Borrow caller’s thread

Domain-specific or Domain-independent

Domain-specific

Domain-independent

Stand-alone composition

entities

“Semi-complete”

applications

Stand-alone language entities

Components

Class Library Architecture

ADTs

Strings

LocksIPC

MathLOCAL

INVOCATIONSAPPLICATION-SPECIFIC

FUNCTIONALITY

EVENTLOOP

GLUECODE

Files

GUI

A class is a unit of abstraction & implementation in an OO programming language

Framework Architecture

ADTs

Locks

Strings

FilesINVOKES

A framework is an integrated set of classes that collaborate to produce a reusable architecture for a family of

applications

Reactor

GUI

DATABASE

NETWORKING

APPLICATION-SPECIFIC FUNCTIONALITY

CALLBACKS

Middleware Bus

Component Architecture

A component is an encapsulation unit with one or more interfaces that provide

clients with access to its services

Naming

LockingLogging

Events


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Deployment Model


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Deployment View


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Software Architecture Types

• Data Flow Architecture - batch processing - filter/pipe• Data Centered Architecture - repository design - blackboard architecture• Hierarchy Architecture - layered architecture - main/subroutine• Interaction Oriented Architecture - MVC (Model-View-Control) - PAC (Presentation-Abstraction-Control)


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Software Architecture Types (cont’d)

• Object Oriented Architecture - OOAD - UML model• Component- Based Architecture - framework approach• Distributed Architecture - client/server, - peer-to-peer - multi-tier• Service-Oriented Architecture - integration with business process


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Composite Subsystem

C3 C4 C5

A

B C

D

C2C1

C7C6


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Compiler Topology

Lexer

Parser

Semantor

Optimizer

CodeGenerator

Lexer Parser Semantor

InternalRepresentation

OptimizerCode

Generator


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Blackboard Architecture

Projectrepository

Designtranslator

Programeditor

Designeditor

Codegenerator

Designanalyser

Reportgenerator


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Invocation Architecture


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Layered Architecture

Operatingsystem

Database system

Object management

Version management


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Architectural Patterns

• Client-Server• MVC (Model-View-Control)• PAC (Presentation-Abstraction-Control)• Pipe and Filter• Remote Procedure Call (RPC)• Layered Architecture• Distributed System• Object-Oriented Architecture• Service-Oriented Architecture• Multi-tier Architecture


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Client-Server

- scalability issue at server

Three-tier Architecture- split functions server -> web server + application server

Client Server

Client Web Server App Server


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Multi-tier Architecture

Client

Client

Client

Front-end

Front-end

Server

Server

Server


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http://upload.wikimedia.org/wikipedia/en/6/66/Overview_of_a_three-tier_application.png

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MVC (Model-View-Control) model

• Java Swing

• GTK++

• MFC

• ASP .Net

• Adobe Flex


http://upload.wikimedia.org/wikipedia/commons/2/2e/ModelViewControllerDiagram.svg

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PAC (Presentation-Abstraction-Control )

Track_Model

- int modelID

- float posLat

+ add(int id)

Track_Presentation

- int presID

- int viewID

+ draw ()


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Questions?


1 lecture 3 major architectural models 4 + 1 view (cont’d) architectural models/patterns...

Documents

architecture clientserver

logical viewviewer

development viewviewer

physical viewviewer

process viewviewer

class diagramtool

layered stylenotation

system engineerconsiders