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模式設(shè)計(jì)c#－－行為型－－Chain of Responsibility

名稱	Chain of Responsibility
結(jié)構(gòu)
意圖	使多個(gè)對(duì)象都有機(jī)會(huì)處理請(qǐng)求，從而避免請(qǐng)求的發(fā)送者和接收者之間的耦合關(guān)系。將這些對(duì)象連成一條鏈，并沿著這條鏈傳遞該請(qǐng)求，直到有一個(gè)對(duì)象處理它為止。
適用性	有多個(gè)的對(duì)象可以處理一個(gè)請(qǐng)求，哪個(gè)對(duì)象處理該請(qǐng)求運(yùn)行時(shí)刻自動(dòng)確定。你想在不明確指定接收者的情況下，向多個(gè)對(duì)象中的一個(gè)提交一個(gè)請(qǐng)求。可處理一個(gè)請(qǐng)求的對(duì)象集合應(yīng)被動(dòng)態(tài)指定。

Code Example

namespace?ChainOfResponsibility_DesignPattern

{

????using?System;

????abstract?class?Handler?

????{

????????protected?Handler?successorHandler;

????????abstract?public?void?HandleRequest(Request?request);????????

????????public?void?SetSuccessor(Handler?sucessor)

????????{

????????????successorHandler?=?sucessor;

????????}

????}

????class?ConcreteHandler1?:?Handler

????{

????????override?public?void?HandleRequest(Request?request)

????????{

????????????//?determine?if?we?can?handle?the?request

????????????if?(request.RequestType?==?1)?//?some?complex?decision?making!

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

????????????????//?request?handling?code?goes?here

????????????????Console.WriteLine("request?handled?in?ConcreteHandler1");

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

????????????else?

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

????????????????//?not?handled?here?-?pass?on?to?next?in?the?chain

????????????????if?(successorHandler?!=?null)

????????????????????successorHandler.HandleRequest(request);

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

????????}

????}

????class?ConcreteHandler2?:?Handler

????{

????????override?public?void?HandleRequest(Request?request)

????????{

????????????//?determine?if?we?can?handle?the?request

????????????if?(request.RequestType?==?2)?//?some?complex?decision?making!

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

????????????????//?request?handling?code?goes?here

????????????????Console.WriteLine("request?handled?in?ConcreteHandler2");

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

????????????else?

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

????????????????//?not?handled?here?-?pass?on?to?next?in?the?chain

????????????????if?(successorHandler?!=?null)

????????????????????successorHandler.HandleRequest(request);

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

????????}

????}

????class?ConcreteHandler3?:?Handler

????{

????????override?public?void?HandleRequest(Request?request)

????????{

????????????//?determine?if?we?can?handle?the?request

????????????if?(request.RequestType?==?3)?//?some?complex?decision?making!

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

????????????????//?request?handling?code?goes?here

????????????????Console.WriteLine("request?handled?in?ConcreteHandler3");

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

????????????else?

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

????????????????//?not?handled?here?-?pass?on?to?next?in?the?chain

????????????????if?(successorHandler?!=?null)

????????????????????successorHandler.HandleRequest(request);

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

????????}

????}

????class?Request?

????{

????????private?int?iRequestType;

????????private?string?strRequestParameters;

????????public?Request(int?requestType,?string?requestParameters)

????????{

????????????iRequestType?=?requestType;????

????????????strRequestParameters?=?requestParameters;

????????}

????????public?int?RequestType?

????????{

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

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

????????????????return?iRequestType;

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

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

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

????????????????iRequestType?=?value;

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

????????}

????}

????///?<summary>

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

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

????public?class?Client

????{

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

????????{

????????????//?Set?up?chain?(usually?one?need?to?be?done?once)

????????????Handler?firstHandler?=?new?ConcreteHandler1();

????????????Handler?secondHandler?=?new?ConcreteHandler2();

????????????Handler?thirdHandler?=?new?ConcreteHandler3();

????????????firstHandler.SetSuccessor(secondHandler);

????????????secondHandler.SetSuccessor(thirdHandler);

????????????//?After?setting?up?the?chain?of?responsibility,?we?can

????????????//?now?generate?requests?and?pass?then?off?to?the?

????????????//?chain?to?be?handled

????????????//?generate?and?fire?request

????????????Request?newRequest?=?new?Request(2,"This?are?the?request?parameters");

????????????firstHandler.HandleRequest(newRequest);

????????????

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

????????}

????}

}

另一個(gè)很好的例子:

/*****************************************************?

*?一個(gè)責(zé)任鏈模式例子?

*該例子是三類售貨員處理訂單的情況?

*如果訂單金額小于1000,則一級(jí)售貨員可以處理該訂單?

*如果訂單金額小于10000,則二級(jí)售貨員可以處理該訂單?

*如果訂單金額小于100000,則三級(jí)售貨員可以處理該訂單?

******************************************************/?

using?System;?

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

///售貨員接口,所有類型的售貨員必須實(shí)現(xiàn)該接口?

///?</summary>?

interface?ISalesMan?

????string?Name?{set;get;}?//售貨員名字?

????void?SetNext(ISalesMan?nextSalesMan);?//設(shè)置下一級(jí)售貨員?

????void?Process(Order?order);?//處理訂單?

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

///?訂單類?

///?</summary>?

class?Order?

????private?int?orderAmount;?

????public?int?Amount?

????{?

????????set{?this.orderAmount?=?value;}?

????????get{?return?this.orderAmount;?}?

????}?

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

///?一類售貨員?

///?</summary>?

class?FirstSalesMan?:?ISalesMan?

????private?ISalesMan?nextSalesMan?=?null;?

????private?string?name?=?string.Empty;?

????ISalesMan?成員ISalesMan?成員?

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

///?二類售貨員?

///?</summary>?

class?SecondSalesMan?:?ISalesMan?

????private?ISalesMan?nextSalesMan?=?null;?

????private?string?name?=?string.Empty;?

????ISalesMan?成員ISalesMan?成員?

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

///?三類售貨員?

///?</summary>?

class?ThirdSalesMan?:?ISalesMan?

????private?ISalesMan?nextSalesMan?=?null;?

????private?string?name?=?string.Empty;?

????ISalesMan?成員ISalesMan?成員?

class?Client?

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

????{?

????????FirstSalesMan?first?=?new?FirstSalesMan();?

????????first.Name?=?"firstMan";?

????????SecondSalesMan?second?=?new?SecondSalesMan();?

????????second.Name?=?"secondMan";?

????????ThirdSalesMan?third?=?new?ThirdSalesMan();?

????????third.Name?=?"thirdMan";?

????????first.SetNext(second);?

????????second.SetNext(third);?

????????Order?o?=?new?Order();?

????????o.Amount?=?300;?

????????first.Process(o);?

????????o?=?new?Order();?

????????o.Amount?=?1300;?

????????first.Process(o);?

????????o?=?new?Order();?

????????o.Amount?=?11300;?

????????first.Process(o);?

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

????}?

posted on 2006-01-03 16:06 夢(mèng)在天涯閱讀(776) 評(píng)論(1) 編輯收藏引用所屬分類: Design pattern

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# re: 模式設(shè)計(jì)c#－－行為型－－Chain of Responsibility 2006-04-24 16:47 夢(mèng)在天涯

職責(zé)鏈（Chain of Responsibility）模式
責(zé)任鏈模式是一種對(duì)象的行為模式【GOF95】。在責(zé)任鏈模式里，很多對(duì)象由每一個(gè)對(duì)象對(duì)其下家的引用而連接起來(lái)形成一條鏈。請(qǐng)求在這個(gè)鏈上傳遞，直到鏈上的某一個(gè)對(duì)象決定處理此請(qǐng)求。發(fā)出這個(gè)請(qǐng)求的客戶端并不知道鏈上的哪一個(gè)對(duì)象最終處理這個(gè)請(qǐng)求，這使得系統(tǒng)可以在不影響客戶端的情況下動(dòng)態(tài)地重新組織鏈和分配責(zé)任。

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# re: 模式設(shè)計(jì)c#－－行為型－－Chain of Responsibility 2006-04-24 16:47 夢(mèng)在天涯

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