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模式設計c#－－行為型－－Chain of Responsibility

名稱	Chain of Responsibility
結構
意圖	使多個對象都有機會處理請求，從而避免請求的發(fā)送者和接收者之間的耦合關系。將這些對象連成一條鏈，并沿著這條鏈傳遞該請求，直到有一個對象處理它為止。
適用性	有多個的對象可以處理一個請求，哪個對象處理該請求運行時刻自動確定。你想在不明確指定接收者的情況下，向多個對象中的一個提交一個請求。可處理一個請求的對象集合應被動態(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;

????????}

????}

}

另一個很好的例子:

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

*?一個責任鏈模式例子?

*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,則一級售貨員可以處理該訂單?

*如果訂單金額小于10000,則二級售貨員可以處理該訂單?

*如果訂單金額小于100000,則三級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現(xiàn)該接口?

///?</summary>?

interface?ISalesMan?

????string?Name?{set;get;}?//售貨員名字?

????void?SetNext(ISalesMan?nextSalesMan);?//設置下一級售貨員?

????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 夢在天涯閱讀(760) 評論(1) 編輯收藏引用所屬分類: Design pattern

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

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# re: 模式設計c#－－行為型－－Chain of Responsibility 2006-04-24 16:47 夢在天涯

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