UML Chuong8 Mauthietke

8/9/2019 UML Chuong8 Mauthietke

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Chn 8: Mu thit k attern

UML/NN 1


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Phn mm tt?Theo kin trc

Comodity (Tin nghi) Firmness Tnh n nh Delight (Tnh m quan)

UML/NN 2


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Kh khn ca thit kphn mm phc tp

nh bt qui tc Phn mm c ththa i v lun lun thai

UML/NN 3


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Nguyn l thit k lp Nguyn l ng m: m vi pht trin thm

Nguyn l thay thLiskov: Cc lp c s c th

Nguyn l nghch

o ph

thu

c: Ph thuc

trc phn tng qu nhiu s bt li)

Principle): Nn tch giao din (vd c chc nngchung) dng chung thnh nhiu c th

UML/NN 4


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Mu thit k(Design Pattern) Ngi thit ktt c kh nng nhn ra nhng mu

quyt vn , , ,

thuc tnh ca thit km c thiu chnh choh mu thit k ii u t cc vn

5 CNPM/NN


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Pattern Tn mu (Pattern name) - describes the essence of the

Mc ch (Intent) - describes the pattern and what itdoes

Tn khc (Also-known-as) - lists any synonyms for the

pattern -

problem

Kh nn v n d n A licabilit - notes s ecificdesign situations in which the pattern is applicable

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Pattern Cu trc (Structure) - describes the classes that are

re uired to im lement the attern

Lp tham gia (Participants) - describes theresponsibilities of the classes that are required to implement

Cng tc (Collaborations) - describes how the

participants collaborate to carry out their responsibilities H qu Consequences - escri es t e esign orces

that affect the pattern and the potential trade-offs that mustbe considered when the pattern is implemented (t cho

n c c a c n Mu lin quan (Related patterns) - cross-references

related desi n atterns

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Cc mu thit k Creational Pattern (Mu kin to):

Abstractional Factory Method Pattern Builder pattern

Factory Method pattern

Prototype Pattern Singleton Pattern

Structure Pattern: c mu Com ositeAdaptor)

8 CNPM/NN


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Mu thit kSingleton Cho php c mt thhin ca lp. Vd: Find

a og, n ey, m ng o n cc ugikt ni CSDL

UML/NN 9


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Singleton (kin to)

Singleton

static Instance

singletonData

return uniqueinstance

SingletonOp()

GetSingletonData()

CS 406: DesignPatterns10


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Singleton CodeUsing system;

{

Protect Singlestone() {}

public static SingleStone Instance(){

if (instance==null)

instance = new SingleStone ();return SingleStone;

}UML/NN 11


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ADAPTER (structure) Ti sdng cc lp nhng giao din (interface)

ng ng c

C nhng vn khng tng thch tim tng

4/16/2010 F21ASMF12


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Adapter

C 2 mu:

M u cu trc Class Mu Cu trc Object

4/16/2010 F21ASMF13


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Adapter1

ClientTarget

Adaptee

reques spec c equest

Adapter

a tha k

4/16/2010 F21ASMF14


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Adapter2

Client Target

reques

Adapter Adaptee

request() specificRequest()

4/16/2010 F21ASMF15


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Adapter example

....//this method expects a WeeklyEmployee object

pu c s a c vo pr n ay ee y mp oyee e

{

System.out.println(e.getName()

+ is paid + e.getPay() ;

}

PayProcessor WeeklyEmployee

4/16/2010 F21ASMF16

printPay(WeeklyEmp

loyee e)

getName()getPay()


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Example

PayProcessor

printPay(WeeklyEmpclient

ada tee loyee e)

?

getEmployeeName()getMonthlySalary()

getName()getPay()

target

4/16/2010 F21ASMF17


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Biu lpClient - unaltered

Target

Pay

ProcessorprintPay

WeeklyEmployeegetPay()

-unaltered.

ee yEmployeee)

ge ame

MonthlyAdapter MonthlyEmployeeMonthlyEmployee : megetPay()getName()

getMonthlyPay()getEmployeeName()

Adapteeunaltered

Adaptor

4/16/2010 F21ASMF18

Provides own implementation of

targets methods which calladaptees methods


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MonthlyAdapter

public class MonthlyAdapter

extends WeeklyEmployee {

private MonthlyEmployee me; //composed with adaptee

created with adaptee object

public MonthlyAdapter(MonthlyEmployee memp)

{ me = memp; }

//own implementation of target method,

//adapting to use adaptees instead

{ return me.getEmployeeName(); }

public int getPay()

4/16/2010 F21ASMF19

.

}


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Test

class Test {

ublic static void main(Strin ar [])

{

WeeklyEmployee we

= new Weekl Em lo ee tim 150

PayProcessor.printPay(we);

=

new MonthlyEmployee(jane, 200);

MonthlyAdapter ma = new MonthlyAdapter (me);

.

}

}

4/16/2010 F21ASMF20


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Mu thit kObserver (hnh vi)

Bi ton thc t: Mt i tng thi gian m g c n n u n c

nhng h s, ng h kim Ta c th D dng thm, bt nhiu i tng th hin

Khi tay i i tng thi gian th tt c cc thhi n c a th i gian u thay i theo

21 CNPM/NN


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Observer

Intent: Ph thuc mt nhiu khi mt i tng bin

bin i tng

tng c lin quan

Khi c 2 hng mt ci ph thuc vo mt ci khc Khi m t bin i ti m t i t n i hi bin i nhn

i tng khc m khng bit bao nhiu i tng cnbin i

22 CNPM/NN

m ng p c n ng ng o

tng khc m khng cn bit r chng


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M hnh Observer

A

Relative Percentages

A B C D

B

CY 10 40 30 20

Z 10 40 30 20A DCB

A=10%B=40%

C=30% Application data

CS 406: DesignPatterns23

D=20%Requests, modifications


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Observer-- Structure

Subject Observer

*

Attach(Observer) Update()

e ac server

Notify()

ConcreteSubject ConcreteObserver

observerState

SetState()

GetState() Update()

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Observer Sequence Diagram

aConcreteSubject:

ConcreteSubject

aConcreteObserver:

ConcreteObserver

anotherConcreteObserver:

ConcreteObserver

SetState()

Update()

GetState()

Update()

GetState()

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Observer-- Example

Subject Observer

*

Attach(Observer) Update()

e ac server

Notify()

ClockTimerDigitalClock AnalogClock

Update()ClockTimer *sub;

Update()

ClockTimer *sub;

Draw() Draw()

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Observer Example Sample Code

class Subject;

public:

virtual ~Observer();virtual void Update(Subject * theChngedSub) = 0;

pro ec e :Observer();

}

class Subject {public:

virtual ~Subject();virtual void Attach Observer *

virtual void Detach(Observer *);virtual void Notify();

protected:* *

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_};


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Observer Example

void Subject :: Attach(Observer* o) {--_

}

void Sub ect :: Detach Observer* o_observers-->Remove(o);

}

void Subject :: Notify() {ListIterator i (_observers);for (i.First(); !i.IsDone(); i.Next()) {

. urren em - p a e s ;}

}

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Observer Example

class ClockTimer : public Subject {public:

virtual int GetHour();virtual int GetMinute();v r ua n e econ ;void Tick();

}

void ClockTimer :: Tick() {// update internal time-keeping state//Notify();

}

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Observer Exampleclass DigitalClock : public Widget, public Observer {

public:*

virtual ~DigitalClock();

virtual void Update(Subject *);v r ua vo raw ;

private:ClockTimer* _subject;

}

DigitalClock :: DigitalClock(ClockTimer *s) {_subject = s;_sub ect->Attach this

}DigitalClock :: ~DigitalClock(ClockTimer *s) {_subject->Detach(this);

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Observer Example

void DigitalClock :: Update(Subject *theChngedSub) {if (theChngedSub == _subject){

}}void DigitalClock :: Draw() {

ge e new va ues rom e su ecint hour = _subject->GetHour();int minute = _subject->GetMinute();

// //draw the digital clock

}

// main

ClockTimer *timer = new ClockTimer;AnalogClock * analogClock = new AnalogClock(timer);DigitalClock * digitalClock = new DigitalClcok(timer);

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Observer C# (tham khao file project)

using System;

using System.Collections;

{

private ArrayList _observer;

public Subject()

_observer = new ArrayList();

}

public void Attach(Observer o)

{

_observer.Add(o);

}

public void Detach(Observer o)

{

_observer.Add(o);

public void Notify(){

for (int i = 0; i < _observer.Count; i++)

{

((Observer)_observer[i]).Update(this);

}

}

}

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Mu thit kComposite (kin trc)

Bi ton thc t: Mt my c cc chi titm y, c c c m y c g m c c cmy n gin (chi tit my n) v c thcn ng c m y c m y p c m

gm c nhng chi tit my n v cc chim y p c c Gii quyt bi ton tnh gi tr ca cc chi tit:

g r m y ng g r c a c c c m y nv gi tr ca chi tit my phc (bng tt c gi

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Composite

Intent (mc ch): Compose objects into tree structures tore resent art-whole hierarchies. Let clients treat individualobjects and compositions of objects uniformly

Motivation (sthc y): components can be grouped to form

aPicture

aPicture aLIne aRectangle

aText aLine aRectangle

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V d 1Graphic *

Draw()

Add(Graphic)Remove(Graphic)

TextLine Rectangle

Picture

Draw()Draw() Draw()

Draw()

Add(Graphic)

Remove(Graphic)

35 CNPM/NN

GetChild(int)


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V d 2Component *

Operation()

Add(Component)Remove(Component)

LeafComposite

Operation()

Operation()

Add(Component)Remove(Component)

36 CNPM/NN

GetChild(int)


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V d khcEquipment *

FloppyDisk CompositeEquipmentCard

Chasis BusCabinet

38 CNPM/NN

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