行为型模式11之4-Chain of Responsibility责任链模式例子理解

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职责链模式
使多个对象都有机会处理请求，从而避免请求的发送者和接受者之间的耦合关系，
将这个对象连成一条链，并沿着这条链传递该请求，直到有一个对象处理他为止。

角色
抽象处理者角色(Handler)：定义出一个处理请求的接口。如果需要，接口可以定义出一个方法以设定和返回对下家的引用。这个角色通常由一个Java抽象类或者Java接口实现。
具体处理者角色(ConcreteHandler)：具体处理者接到请求后，可以选择将请求处理掉，或者将请求传给下家。由于具体处理者持有对下家的引用，因此，如果需要，具体处理者可以访问下家。
抽象处理者角色

例子：
1。sales

package com.test.chain_of_responsibilitymodel;public class Sales extends PriceCaseBase{    @Override    public void postPriceUp(float price) {        // TODO Auto-generated method stub        if(price>=90){            System.out.println("90以内"+this.getClass().getName()+"批准了！卖"+price);        }else {            priceCaseBase.postPriceUp(price);        }    }}

2。SalesManger

package com.test.chain_of_responsibilitymodel;public class SalesManger extends PriceCaseBase{    @Override    public void postPriceUp(float price) {        // TODO Auto-generated method stub        if(price>=70){            System.out.println("70以内"+this.getClass().getName()+"批准了！卖"+price);        }else {            priceCaseBase.postPriceUp(price);        }    }}

3。PartManger

package com.test.chain_of_responsibilitymodel;public class PartManger extends PriceCaseBase{    @Override    public void postPriceUp(float price) {        // TODO Auto-generated method stub        if(price>=50){            System.out.println("50以内"+this.getClass().getName()+"批准了！卖"+price);        }else {            priceCaseBase.postPriceUp(price);        }    }}

4。CompanyManger

package com.test.chain_of_responsibilitymodel;public class CompanyManger extends PriceCaseBase{    @Override    public void postPriceUp(float price) {        // TODO Auto-generated method stub        if(price>=30){            System.out.println("30以内"+this.getClass().getName()+"批准了！卖"+price);        }else {            System.out.println(price+"太亏了，卖不了！");        }    }}

5。interface PriceCaseBase

package com.test.chain_of_responsibilitymodel;public abstract class PriceCaseBase {    // 子类可以访问到自身的引用    protected PriceCaseBase priceCaseBase;    public void setPriceCaseBase(PriceCaseBase priceCaseBase) {        this.priceCaseBase = priceCaseBase;    }    public abstract void postPriceUp(float price);}

6。PriceCaseBaseFactory

package com.test.chain_of_responsibilitymodel;public class PriceCaseBaseFactory {    /**     *      * @return     */    public static PriceCaseBase createPriceCaseBaseFactory() {        PriceCaseBase sales = new Sales();        PriceCaseBase salesManger = new SalesManger();        PriceCaseBase partManger = new PartManger();        PriceCaseBase companyManger = new CompanyManger();        // 依次设置直接后继        sales.setPriceCaseBase(salesManger);        salesManger.setPriceCaseBase(partManger);        partManger.setPriceCaseBase(companyManger);        return sales;    }}

7。Test

package com.test.chain_of_responsibilitymodel;public class Test {    PriceCaseBase priceCaseBase;    public void setPriceCaseBase(PriceCaseBase priceCaseBase) {        this.priceCaseBase = priceCaseBase;    }    public void doCasePrice(float price) {        priceCaseBase.postPriceUp(price);    }    public static void main(String[] agrs) {        Test test = new Test();        test.setPriceCaseBase(PriceCaseBaseFactory.createPriceCaseBaseFactory());        for (int i = 0; i < 50; i++) {            System.out.print("=======" + i+":");            float price =(float) (Math.random()*100);            test.doCasePrice(price);        }    }}

8.结果

=======0:12.921482太亏了，卖不了！=======1:15.293591太亏了，卖不了！=======2:70以内com.test.chain_of_responsibilitymodel.SalesManger批准了！卖72.087074=======3:30以内com.test.chain_of_responsibilitymodel.CompanyManger批准了！卖48.80181=======4:70以内com.test.chain_of_responsibilitymodel.SalesManger批准了！卖76.63781=======5:15.493307太亏了，卖不了！=======6:70以内com.test.chain_of_responsibilitymodel.SalesManger批准了！卖87.30026=======7:70以内com.test.chain_of_responsibilitymodel.SalesManger批准了！卖76.97786=======8:30以内com.test.chain_of_responsibilitymodel.CompanyManger批准了！卖32.80416=======9:30以内com.test.chain_of_responsibilitymodel.CompanyManger批准了！卖40.209476=======10:30以内com.test.chain_of_responsibilitymodel.CompanyManger批准了！卖35.908688=======11:30以内com.test.chain_of_responsibilitymodel.CompanyManger批准了！卖42.464153=======12:70以内com.test.chain_of_responsibilitymodel.SalesManger批准了！卖83.58707=======13:50以内com.test.chain_of_responsibilitymodel.PartManger批准了！卖64.86954=======14:9.98403太亏了，卖不了！=======15:70以内com.test.chain_of_responsibilitymodel.SalesManger批准了！卖82.65527=======16:11.788233太亏了，卖不了！=======17:30以内com.test.chain_of_responsibilitymodel.CompanyManger批准了！卖48.04178=======18:50以内com.test.chain_of_responsibilitymodel.PartManger批准了！卖67.012344=======19:50以内com.test.chain_of_responsibilitymodel.PartManger批准了！卖51.525536=======20:50以内com.test.chain_of_responsibilitymodel.PartManger批准了！卖52.2112=======21:50以内com.test.chain_of_responsibilitymodel.PartManger批准了！卖67.39455=======22:50以内com.test.chain_of_responsibilitymodel.PartManger批准了！卖55.068405=======23:50以内com.test.chain_of_responsibilitymodel.PartManger批准了！卖53.07613=======24:22.03274太亏了，卖不了！=======25:3.1497579太亏了，卖不了！=======26:10.088352太亏了，卖不了！=======27:16.632261太亏了，卖不了！=======28:70以内com.test.chain_of_responsibilitymodel.SalesManger批准了！卖81.409966=======29:90以内com.test.chain_of_responsibilitymodel.Sales批准了！卖99.8564=======30:70以内com.test.chain_of_responsibilitymodel.SalesManger批准了！卖76.012665=======31:21.622719太亏了，卖不了！=======32:50以内com.test.chain_of_responsibilitymodel.PartManger批准了！卖64.79263=======33:50以内com.test.chain_of_responsibilitymodel.PartManger批准了！卖57.329395=======34:50以内com.test.chain_of_responsibilitymodel.PartManger批准了！卖50.622337=======35:90以内com.test.chain_of_responsibilitymodel.Sales批准了！卖94.80636=======36:70以内com.test.chain_of_responsibilitymodel.SalesManger批准了！卖83.27312=======37:30以内com.test.chain_of_responsibilitymodel.CompanyManger批准了！卖37.24371=======38:50以内com.test.chain_of_responsibilitymodel.PartManger批准了！卖52.56701=======39:70以内com.test.chain_of_responsibilitymodel.SalesManger批准了！卖83.86704=======40:30以内com.test.chain_of_responsibilitymodel.CompanyManger批准了！卖48.795223=======41:23.143074太亏了，卖不了！=======42:30以内com.test.chain_of_responsibilitymodel.CompanyManger批准了！卖38.384327=======43:50以内com.test.chain_of_responsibilitymodel.PartManger批准了！卖57.880505=======44:12.155732太亏了，卖不了！=======45:30以内com.test.chain_of_responsibilitymodel.CompanyManger批准了！卖38.517277=======46:70以内com.test.chain_of_responsibilitymodel.SalesManger批准了！卖72.23591=======47:90以内com.test.chain_of_responsibilitymodel.Sales批准了！卖97.363785=======48:30以内com.test.chain_of_responsibilitymodel.CompanyManger批准了！卖38.471447=======49:10.121493太亏了，卖不了！

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