使用工厂方法模式实现各种不同分润规则

本文主要是介绍使用工厂方法模式实现各种不同分润规则，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

本人邮箱: kco1989@qq.com
欢迎转载,转载请注明网址 http://blog.csdn.net/tianshi_kco
github: https://github.com/kco1989/kco
代码已经全部托管github有需要的同学自行下载

引言

在上一篇文章中使用简单工厂编写不同的分润规则遗留着一个问题,那就是如果要新增分润规则,则需要修改原来的类.也就是代码没有完全解耦.
因此在这一篇中,我将分润规则的设计改为抽象工厂模式来编写.以解决上次遗留的问题.

改写示例

分润规则接口类

该类与上一篇是一样的.

public interface ProfitRole {double getProfit(double money);
}

分润规则抽象工厂类

public abstract class ProfitRoleFactory {public static ProfitRole createProfitRole(String profitTypeName, String expression){ProfitType profitType = ProfitType.getProfitType(profitTypeName);Matcher matcher = profitType.getPattern().matcher(expression);if (!matcher.matches()){throw new RuntimeException("分润表示时不符合" + profitType.getName() + "的规则.");}return profitType.getFactory().newProfitRole(profitType, matcher, expression);}protected abstract ProfitRole newProfitRole(ProfitType profitType, Matcher matcher, String expression);}

该类主要提供一个统一的接口ProfitRoleFactory.createProfitRole创建分润规则实现类
每一个分润规则实现类对应一个分润规则工厂类,由分润规则工厂类来创建出分润规则对象
再由分润规则对象实现具体的分润细节

分润规则类型

上一篇使用到的枚举类型.但是java不支持动态增加枚举成员.所以如果这一篇还是使用枚举类型的话,则在增加新的分润规则时难免需要修改该枚举类型.
因此,这一篇不是枚举类型.

public class ProfitType {// 非捕捉匹配正实数public static final String number = "(?:(?:[1-9]+\\d*)|(?:\\d))(?:\\.\\d+)?";// 捕捉匹配正实数public static final String realNumber = "(" + number + ")";// 捕捉匹配百分比public static final String rateNumber = realNumber + "%";// 分润规则mapprivate static final Map<String, ProfitType> profitTypeMap = new HashMap<>();static {ProfitType.registerProfitRole("FIXED_RATE","^"+ ProfitType.rateNumber +"$",new FixedRateRoleFactory(),"每笔收益率为0.1%则填写代理商收益0.1%;");ProfitType.registerProfitRole("FIXED_INCOME","^" + ProfitType.realNumber + "$",new FixedIncomeRoleFactory(),"每笔固定收益1元，则填写代理商收益1.00");ProfitType.registerProfitRole("FIXED_RATE_AND_FIXED_INCOME","^"+ ProfitType.rateNumber  + "\\+" + ProfitType.realNumber + "$",new FixedRateAndFixedIncomeRoleFactory(),"每笔收益率为0.1%加上固定收益1元，则填写代理商收益0.1%+1.00");ProfitType.registerProfitRole("FIXED_RATE_AND_UPPER_LIMIT","^"+ ProfitType.realNumber + "~" + ProfitType.rateNumber + "~" + ProfitType.realNumber  + "$",new FixedRateAndUpperLimitRoleFactory(),"每笔收益率为0.1%，封顶3元，保底1元则填写代理商收益1.00~0.1%~3.00;");ProfitType.registerProfitRole("GRADIENT_RATE","^"+ ProfitType.rateNumber+"(<"+ ProfitType.realNumber+"<"+ ProfitType.rateNumber+")+$",new GradientRateRoleFactory(),"梯度分润 例如 0.1%<10000<0.2%<20000<0.3%<30000<0.5%");}private String name;private String expression;private String description;private ProfitRoleFactory factory;public ProfitType(String name, String expression, ProfitRoleFactory factory, String description) {this.name = name;this.expression = expression;this.factory = factory;this.description = description;}public static Pattern getNumberPattern() {return Pattern.compile(number);}public String getName() {return name;}public Pattern getPattern(){return Pattern.compile(this.expression);}/*** 注册分润规则类型*/public static void registerProfitRole(String name, String profitRoleExpression,ProfitRoleFactory factory, String description){if (profitTypeMap.containsKey(name)){throw new RuntimeException("该"+name+"分润规则已经存在");}profitTypeMap.put(name, new ProfitType(name, profitRoleExpression, factory, description));}public ProfitRoleFactory getFactory() {return factory;}public String getDescription() {return description;}/*** 根据分润规则名字获取分润规则类型*/public static ProfitType getProfitType(String name){return profitTypeMap.get(name);}public static String getProfitTypeInfo(){StringBuilder sb = new StringBuilder();for (Map.Entry<String, ProfitType> entry : profitTypeMap.entrySet()){sb.append(entry.getKey() + " --> " + entry.getValue().getDescription() + "\n");}return sb.toString();}
}

ProfitType.profitTypeMap 存放分润类型名称和分润类型的key-value值
ProfitType.registerProfitRole 提供一个注册分润类型的借口
ProfitType static域 默认增加上一篇提到的5种分润规则

分润规则工厂类和分润规则实现类

目前提供五种分润规则:
1. 每笔固定收益1元，则填写代理商收益1.00
2. 每笔收益率为0.1%则填写代理商收益0.1%
3. 每笔收益率为0.1%加上固定收益1元，则填写代理商收益0.1%+1.00
4. 每笔收益率为0.1%，封顶3元，保底1元则填写代理商收益1.00~0.1%~3.00
5. 梯度分润 例如 0.1%<10000<0.2%<20000<0.3%<30000<0.5%
- 少于10000 按照 0.1% 分润
- 少于20000 按照 0.2% 分润
- 少于30000 按照 0.3% 分润
- 多于30000 按照 0.5% 分润

分别对应于分润规则工厂类 -> 分润规则实现类:

1. FixedIncomeRoleFactory -> FixedIncomeRole
2. FixedRateRoleFactory -> FixedRateRole
3. FixedRateAndFixedIncomeRoleFactory -> FixedRateAndFixedIncomeRole
4. FixedRateAndUpperLimitRoleFactory -> FixedRateAndUpperLimitRole
5. GradientRateRoleFactory -> GradientRateRole

实现新的分润规则

如果需要实现新的分润规则,则分别编写一个分润规则工厂类和分润规则实现类,使其实分别继承(/实现)ProfitRoleFactory和ProfitRole,然后再调用ProfitType.registerProfitRole注册一下新的分润规则就万事大吉了.不需要修改原有的代码.也就是实现了完全解耦.

测试类

public class TestProfitRole2 {private static final List<Double> testDate = Arrays.asList(100.0,200.0,300.0,400.0,700.0,1000.0,2000.0,3000.0,7000.0,10000.0, 20000.0, 30000.0, 70000.0);@Testpublic void test(){String profitTypeInfo = ProfitType.getProfitTypeInfo();System.out.println(profitTypeInfo);}@Testpublic void testFixedIncome(){for (double data : testDate){ProfitRole fixedIncome = ProfitRoleFactory.createProfitRole("FIXED_INCOME", "1.00");double profit = fixedIncome.getProfit(data);Assert.assertEquals(1.00, profit, 0.00001);}}@Testpublic void testFixedRate(){for (double data : testDate){ProfitRole fixedRate = ProfitRoleFactory.createProfitRole("FIXED_RATE", "0.1%");double profit = fixedRate.getProfit(data);Assert.assertEquals(data * 0.1 * 0.01, profit, 0.00001);}}@Testpublic void testFixedRateAndFixedIncome(){for (double data : testDate){ProfitRole profitRole = ProfitRoleFactory.createProfitRole("FIXED_RATE_AND_FIXED_INCOME", "0.63%+3.00");double profit = profitRole.getProfit(data);Assert.assertEquals(data * 0.63 * 0.01 + 3.0, profit, 0.00001);}}@Testpublic void testFixedRateAndUpperLimit(){for (double data : testDate){ProfitRole profitRole = ProfitRoleFactory.createProfitRole("FIXED_RATE_AND_UPPER_LIMIT", "1.00~0.1%~3.00");double profit = profitRole.getProfit(data);double actual = data * 0.1 * 0.01;if (actual < 1.0){actual = 1.0;}if (actual > 3.0){actual = 3.0;}Assert.assertEquals(actual, profit, 0.00001);}}@Testpublic void testGradientRate(){for (double data : testDate){ProfitRole profitRole = ProfitRoleFactory.createProfitRole("GRADIENT_RATE", "0.1%<1000<0.2%<5000<0.3%<15000<0.5%");double profit = profitRole.getProfit(data);if (data < 1000){Assert.assertEquals(data * 0.01 * 0.1, profit, 0.00001);}else if (data < 5000){Assert.assertEquals(data * 0.01 * 0.2, profit, 0.00001);}else if(data < 15000){Assert.assertEquals(data * 0.01 * 0.3, profit, 0.00001);}else{Assert.assertEquals(data * 0.01 * 0.5, profit, 0.00001);}}}
}

打赏

如果觉得我的文章写的还过得去的话,有钱就捧个钱场,没钱给我捧个人场(帮我点赞或推荐一下)

这篇关于使用工厂方法模式实现各种不同分润规则的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！

---