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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(778) 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，這使得系統可以在不影響客戶端的情況下動態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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