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            C++ Programmer's Cookbook
            

            {C++ 基礎(chǔ)}

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{設(shè)計(jì)模式}

{C#基礎(chǔ)}






            
			
            
				
					
	
            
		
            
			模式設(shè)計(jì)c#－－結(jié)構(gòu)型－－facade
		
            
		
            
		
            
				
						
            
								名稱
								
										Facade
								
						
            
						
            
								結(jié)構(gòu)
								
										o_facade.bmp
								
						
            
						
            
								意圖
								為子系統(tǒng)中的一組接口提供一個(gè)一致的界面，F(xiàn) a c a d e 模式定義了一個(gè)高層接口，這個(gè)接口使得這一子系統(tǒng)更加容易使用。
						
            
						
            
								適用性
								
										
              
												
            • 當(dāng)你要為一個(gè)復(fù)雜子系統(tǒng)提供一個(gè)簡(jiǎn)單接口時(shí)。子系統(tǒng)往往因?yàn)椴粩嘌莼兊迷絹?lái)越復(fù)雜。大多數(shù)模式使用時(shí)都會(huì)產(chǎn)生更多更小的類。這使得子系統(tǒng)更具可重用性，也更容易對(duì)子系統(tǒng)進(jìn)行定制，但這也給那些不需要定制子系統(tǒng)的用戶帶來(lái)一些使用上的困難。F a c a d e 可以提供一個(gè)簡(jiǎn)單的缺省視圖，這一視圖對(duì)大多數(shù)用戶來(lái)說(shuō)已經(jīng)足夠，而那些需要更多的可定制性的用戶可以越過(guò)f a c a d e 層。 

              • 
												
            • 客戶程序與抽象類的實(shí)現(xiàn)部分之間存在著很大的依賴性。引入f a c a d e 將這個(gè)子系統(tǒng)與客戶以及其他的子系統(tǒng)分離，可以提高子系統(tǒng)的獨(dú)立性和可移植性。 

              • 
												
            • 當(dāng)你需要構(gòu)建一個(gè)層次結(jié)構(gòu)的子系統(tǒng)時(shí)，使用f a c a d e 模式定義子系統(tǒng)中每層的入口點(diǎn)。如果子系統(tǒng)之間是相互依賴的，你可以讓它們僅通過(guò)f a c a d e 進(jìn)行通訊，從而簡(jiǎn)化了它們之間的依賴關(guān)系。 
              • 
										
            
								            		
						
            
						
            
								
								
								
								
						
            
				            
		
            
		
            Code Example
            namespace?Facade_DesignPattern
            {
            ????            using?System;

            ????            class?SubSystem_class1?
            ????            {
            ????????            public?void?OperationX()?
            ????????            {
            ????????????Console.WriteLine(            "SubSystem_class1.OperationX?called");
            ????????}
            ????}

            ????            class?SubSystem_class2
            ????            {
            ????????            public?void?OperationY()
            ????????            {
            ????????????Console.WriteLine(            "SubSystem_class2.OperationY?called");
            ????????}
            ????}

            ????            class?SubSystem_class3?
            ????            {
            ????????            public?void?OperationZ()
            ????????            {????????????
            ????????????Console.WriteLine(            "SubSystem_class3.OperationZ?called");
            ????????}            ????
            ????}

            ????            class?Facade?
            ????            {
            ????????            private?SubSystem_class1?c1?=?new?SubSystem_class1();
            ????????            private?SubSystem_class2?c2?=?new?SubSystem_class2();
            ????????            private?SubSystem_class3?c3?=?new?SubSystem_class3();

            ????????            public?void?OperationWrapper()
            ????????            {
            ????????????Console.WriteLine(            "The?Facade?OperationWrapper?carries?out?complex?decision-making");
            ????????????Console.WriteLine(            "which?in?turn?results?in?calls?to?the?subsystem?classes");
            ????????????c1.OperationX();
            ????????????            if?(1==1?/*some?really?complex?decision*/)
            ????????????            {
            ????????????????c2.OperationY();
            ????????????}
            ????????????            //?lots?of?complex?code?here?.?.?.
            ????????????c3.OperationZ();
            ????????}
            ????????
            ????}

            ????            ///?<summary>
            ????            ///????Summary?description?for?Client.
            ????            ///?</summary>
            ????public?class?Client
            ????            {
            ??????????            public?static?int?Main(string[]?args)
            ????????            {
            ????????????Facade?facade?            =?new?Facade();
            ????????????Console.WriteLine(            "Client?calls?the?Facade?OperationWrapper");
            ????????????facade.OperationWrapper();??????
            ????????????            return?0;
            ????????}
            ????}
            }

            一個(gè)實(shí)際生活的例子:
            //?Facade?pattern?--?Real?World?example??


            using?System;

            namespace?DoFactory.GangOfFour.Facade.RealWorld
            {
            ??            //?MainApp?test?application?

            ??            class?MainApp
            ??            {
            ????            static?void?Main()
            ????            {
            ??????            //?Facade?
            ??????Mortgage?mortgage?=?new?Mortgage();

            ??????            //?Evaluate?mortgage?eligibility?for?customer?
            ??????Customer?customer?=?new?Customer("Ann?McKinsey");
            ??????            bool?eligable?=?mortgage.IsEligible(customer,125000);
            ??????
            ??????Console.WriteLine(            "\n"?+?customer.Name?+?
            ??????????            "?has?been?"?+?(eligable???"Approved"?:?"Rejected"));

            ??????            //?Wait?for?user?
            ??????Console.Read();
            ????}
            ??}

            ??            //?"Subsystem?ClassA"?

            ??            class?Bank
            ??            {
            ????            public?bool?HasSufficientSavings(Customer?c,?int?amount)
            ????            {
            ??????Console.WriteLine(            "Check?bank?for?"?+?c.Name);
            ??????            return?true;
            ????}
            ??}

            ??            //?"Subsystem?ClassB"?

            ??            class?Credit
            ??            {
            ????            public?bool?HasGoodCredit(Customer?c)
            ????            {
            ??????Console.WriteLine(            "Check?credit?for?"?+?c.Name);
            ??????            return?true;
            ????}
            ??}

            ??            //?"Subsystem?ClassC"?

            ??            class?Loan
            ??            {
            ????            public?bool?HasNoBadLoans(Customer?c)
            ????            {
            ??????Console.WriteLine(            "Check?loans?for?"?+?c.Name);
            ??????            return?true;
            ????}
            ??}

            ??            class?Customer
            ??            {
            ????            private?string?name;

            ????            //?Constructor?
            ????public?Customer(string?name)
            ????            {
            ??????            this.name?=?name;
            ????}

            ????            //?Property?
            ????public?string?Name
            ????            {
            ??????            get{?return?name;?}
            ????}
            ??}

            ??            //?"Facade"?

            ??            class?Mortgage
            ??            {
            ????            private?Bank?bank?=?new?Bank();
            ????            private?Loan?loan?=?new?Loan();
            ????            private?Credit?credit?=?new?Credit();

            ????            public?bool?IsEligible(Customer?cust,?int?amount)
            ????            {
            ??????Console.WriteLine(            "{0}?applies?for?{1:C}?loan\n",
            ????????cust.Name,?amount);

            ??????            bool?eligible?=?true;

            ??????            //?Check?creditworthyness?of?applicant?
            ??????if?(!bank.HasSufficientSavings(cust,?amount))?
            ??????            {
            ????????eligible?            =?false;
            ??????}
            ??????            else?if?(!loan.HasNoBadLoans(cust))?
            ??????            {
            ????????eligible?            =?false;
            ??????}
            ??????            else?if?(!credit.HasGoodCredit(cust))?
            ??????            {
            ????????eligible?            =?false;
            ??????}

            ??????            return?eligible;
            ????}
            ??}
            }            ?
            Output
            MethodA() ----
            SubSystemOne Method
            SubSystemTwo Method
            SubSystemFour Method

            MethodB() ----
            SubSystemTwo Method
            SubSystemThree Method
            
		
            
			posted on 2006-01-03 15:48 夢(mèng)在天涯 閱讀(876) 評(píng)論(1)  編輯 收藏 引用  所屬分類: Design pattern 
		
            
	
            
	
	


	


            
	    
    


            

            評(píng)論
            
	
	
			
            
				# re: 模式設(shè)計(jì)c#－－結(jié)構(gòu)型－－facade
					
						2006-04-24 15:17
					
				夢(mèng)在天涯
			
            
			
            
				在什么情況下使用門面模式

            為一個(gè)復(fù)雜子系統(tǒng)提供一個(gè)簡(jiǎn)單接口 

            提高子系統(tǒng)的獨(dú)立性 

            在層次化結(jié)構(gòu)中，可以使用Facade模式定義系統(tǒng)中每一層的入口。

              回復(fù)  更多評(píng)論
				  
			
            
		

            




            






            

				
			
            
			
            
				
					

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