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名稱	Mediator
結(jié)構(gòu)
意圖	用一個中介對象來封裝一系列的對象交互。中介者使各對象不需要顯式地相互引用，從而使其耦合松散，而且可以獨立地改變它們之間的交互。
適用性	一組對象以定義良好但是復(fù)雜的方式進行通信。產(chǎn)生的相互依賴關(guān)系結(jié)構(gòu)混亂且難以理解。一個對象引用其他很多對象并且直接與這些對象通信,導(dǎo)致難以復(fù)用該對象。想定制一個分布在多個類中的行為，而又不想生成太多的子類。

namespace ?Mediator_DesignPattern

{

???? using ?System;

???? class ?Mediator?

???? {

???????? private ?DataProviderColleague?dataProvider;

???????? private ?DataConsumerColleague?dataConsumer;

???????? public ? void ?IntroduceColleagues(DataProviderColleague?c1,?DataConsumerColleague?c2)

???????? {

????????????dataProvider? = ?c1;

????????????dataConsumer? = ?c2;????????????

????????}

????????

???????? public ? void ?DataChanged()

???????? {

???????????? int ?i? = ?dataProvider.MyData;

????????????dataConsumer.NewValue(i);

????????}

????}

???? class ?DataConsumerColleague?

???? {

???????? public ? void ?NewValue( int ?i)

???????? {

????????????Console.WriteLine( " New?value?{0} " ,?i);

????????}

????}

???? class ?DataProviderColleague

???? {

???????? private ?Mediator?mediator;

???????? private ? int ?iMyData = 0 ;

???????? public ? int ?MyData?

???????? {

???????????? get ?

???????????? {

???????????????? return ?iMyData;

????????????}

???????????? set ?

???????????? {

????????????????iMyData? = ?value;

????????????}

????????}

???????? public ?DataProviderColleague(Mediator?m)

???????? {

????????????mediator? = ?m;

????????}

???????? public ? void ?ChangeData()

???????? {

????????????iMyData? = ? 403 ;

???????????? // ?Inform?mediator?that?I?have?changed?the?data

???????????? if ?(mediator? != ? null )

????????????????mediator.DataChanged();????

????????} ????????

????}

???? /// ? <summary>

???? /// ????Summary?description?for?Client.

???? /// ? </summary>

???? public ? class ?Client

???? {

???????? public ? static ? int ?Main( string []?args)

???????? {????????????

????????????Mediator?m? = ? new ?Mediator();

????????????DataProviderColleague?c1? = ? new ?DataProviderColleague(m);

????????????DataConsumerColleague?c2? = ? new ?DataConsumerColleague();

????????????m.IntroduceColleagues(c1,c2);

????????????c1.ChangeData();

???????????? return ? 0 ;

????????}

????}

}

很好的例子:聊天室:

//?Mediator?pattern?--?Real?World?example??

using?System;

using?System.Collections;

namespace?DoFactory.GangOfFour.Mediator.RealWorld

{

??//?MainApp?test?application?

??class?MainApp

??{

????static?void?Main()

????{

??????//?Create?chatroom?

??????Chatroom?chatroom?=?new?Chatroom();

??????//?Create?participants?and?register?them?

??????Participant?George?=?new?Beatle("George");

??????Participant?Paul?=?new?Beatle("Paul");

??????Participant?Ringo?=?new?Beatle("Ringo");

??????Participant?John?=?new?Beatle("John")?;

??????Participant?Yoko?=?new?NonBeatle("Yoko");

??????chatroom.Register(George);

??????chatroom.Register(Paul);

??????chatroom.Register(Ringo);

??????chatroom.Register(John);

??????chatroom.Register(Yoko);

??????//?Chatting?participants?

??????Yoko.Send?("John",?"Hi?John!");

??????Paul.Send?("Ringo",?"All?you?need?is?love");

??????Ringo.Send("George",?"My?sweet?Lord");

??????Paul.Send?("John",?"Can't?buy?me?love");

??????John.Send?("Yoko",?"My?sweet?love")?;

??????//?Wait?for?user?

??????Console.Read();

????}

??}

??//?"Mediator"?

??abstract?class?AbstractChatroom

??{

????public?abstract?void?Register(Participant?participant);

????public?abstract?void?Send(

??????string?from,?string?to,?string?message);

??}

??//?"ConcreteMediator"?

??class?Chatroom?:?AbstractChatroom

??{

????private?Hashtable?participants?=?new?Hashtable();

????public?override?void?Register(Participant?participant)

????{

??????if?(participants[participant.Name]?==?null)

??????{

????????participants[participant.Name]?=?participant;

??????}

??????participant.Chatroom?=?this;

????}

????public?override?void?Send(

??????string?from,?string?to,?string?message)

????{

??????Participant?pto?=?(Participant)participants[to];

??????if?(pto?!=?null)

??????{

????????pto.Receive(from,?message);

??????}

????}

??}

??//?"AbstractColleague"?

??class?Participant

??{

????private?Chatroom?chatroom;

????private?string?name;

????//?Constructor?

????public?Participant(string?name)

????{

??????this.name?=?name;

????}

????//?Properties?

????public?string?Name

????{

??????get{?return?name;?}

????}

????public?Chatroom?Chatroom

????{

??????set{?chatroom?=?value;?}

??????get{?return?chatroom;?}

????}

????public?void?Send(string?to,?string?message)

????{

??????chatroom.Send(name,?to,?message);

????}

????public?virtual?void?Receive(

??????string?from,?string?message)

????{

??????Console.WriteLine("{0}?to?{1}:?'{2}'",

????????from,?Name,?message);

????}

??}

??//"?ConcreteColleague1"?

??class?Beatle?:?Participant

??{

????//?Constructor?

????public?Beatle(string?name)?:?base(name)?

????{?

????}

????public?override?void?Receive(string?from,?string?message)

????{

??????Console.Write("To?a?Beatle:?");

??????base.Receive(from,?message);

????}

??}

??//"?ConcreteColleague2"?

??class?NonBeatle?:?Participant

??{

????//?Constructor?

????public?NonBeatle(string?name)?:?base(name)?

????{?

????}

????public?override?void?Receive(string?from,?string?message)

????{

??????Console.Write("To?a?non-Beatle:?");

??????base.Receive(from,?message);

????}

??}

}

posted on 2006-01-03 16:10 夢在天涯閱讀(751) 評論(0) 編輯收藏引用所屬分類: Design pattern

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