├── LICENSE ├── README.md ├── READMEIMG ├── 211690962797_.pic.jpg ├── q2.png ├── qo.png ├── rela1.png └── vv.png ├── pom.xml └── src └── main ├── java └── com │ └── github │ └── qcalculator │ ├── core │ ├── aware │ │ └── CalculatorRouter.java │ ├── discount │ │ ├── Calculator.java │ │ └── impl │ │ │ └── AbstractCalculator.java │ ├── enums │ │ ├── GoodsType.java │ │ ├── GroupRelation.java │ │ └── ItemIdType.java │ ├── model │ │ ├── common │ │ │ ├── CalcResult.java │ │ │ ├── CalcStage.java │ │ │ ├── CalcState.java │ │ │ ├── DiscountConfig.java │ │ │ ├── DiscountContext.java │ │ │ ├── DiscountGroup.java │ │ │ ├── DiscountWrapper.java │ │ │ └── Item.java │ │ └── goods │ │ │ ├── GoodsInfo.java │ │ │ └── GoodsItem.java │ ├── permutation │ │ └── Permutation.java │ ├── precompute │ │ ├── PreCompute.java │ │ └── PreComputeHolder.java │ └── utils │ │ ├── DiscountGroupUtil.java │ │ ├── IdGenerator.java │ │ └── LimitingUtil.java │ └── demo │ ├── App.java │ └── biz │ ├── Flowable.java │ ├── TestController.java │ ├── calc │ ├── ManjianCalc.java │ └── ZhekouCalc.java │ ├── constant │ └── Constant.java │ └── precompute │ └── PreGroupBy.java └── resources └── calculator-core.properties /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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15 | 16 | ## Stateless高性能优惠叠加计算框架 17 | 18 | #### RT: 19 | 6000QPS下，RT的表现，可以说比较惊人了 20 | 21 | 22 | 23 | 24 | #### 背景： 25 | 26 | 优惠是营销转化链路的重要抓手，对刺激用户消费起到至关重要的作用，目前市场上的优惠主要包含活动（如拼多多的砍一刀、天猫农场、新用户首购、复购、积分等）和券（如折扣券、代金券、商品券、买A赠B等），复杂的优惠规则让用户很难自行计算优惠叠加的顺序，或许用户在复杂的优惠规则中降低购买商品的欲望，对于参加了多个活动、有多个优惠券情况尤为明显。 27 | 28 | 优惠的计算顺序可以分为平行式和渐进式，其中平行式优惠之间没有依赖关系，而渐进式优惠之间则存在依赖关系，即下一个优惠取决于上一步的优惠结果，假设小明消费了100元，有一个8折优惠券和一个满100-20的优惠券，则这2个优惠的使用顺序有以下两种情况： 29 | 30 | 31 | 32 | 33 | 34 | `Q-calculator`采用很多新颖的算法实现了高性能求解优惠最优排列。 35 | 36 | 37 | 38 | #### 核心计算类 Permutation<T extends GoodsItem> 39 | 40 | `Permutation`是一个抽象类，是`Q-calculator`的核心，在`Permutation`中使用了很多优化策略来保证性能，这些策略包括： 41 | 42 | - 预存的排列数结果集 43 | 44 | 这么设计的原因是在业务场景中需要频繁的计算排列，对于某个长度的序列，其排列结果是固定的。在`Permutation`类中的`PERMUTATIONS`属性存放了7以内的排列数结果集，这里使用了`Byte`来存储，因此占用的内存空间非常小。 45 | ```Java 46 | private final static Map>> PERMUTATIONS = Maps.newHashMap(); 47 | 48 | ``` 49 | 这个动作在类加载即完成，如果对7不满意，可以调整`SUPPORTEDSIZE`的大小，7是我们在实现中摸出来的兼顾业务和性能的参数，大家可以根据自己的需要来调整。 50 | 51 | ```Java 52 | public final static int SUPPORTEDSIZE = 7; 53 | 54 | static{ 55 | //前置计算 1-SUPPORTEDSIZE 之间所有排列组合 56 | for(byte i=1;i<=SUPPORTEDSIZE;i++){ 57 | PERMUTATIONS.put((int)i,Collections2.permutations(IntStream.range(0,i).boxed().map(x->(byte)x.intValue()).collect(Collectors.toList()))); 58 | } 59 | } 60 | 61 | ``` 62 | 63 | - $A_n^3$ 级别缓存 64 | 65 | 相对于传统的`Key-Value`结构，求解 $A_n^n$ 问题的缓存需要特殊设计，对一个优惠集合而言 $A_n^3$ 意味着缓存 n x (n-1) x (n-2) 条数据，默认n为7则需要缓存210条数据，兼顾内存大小和缓存带来的性能收益， $A_n^3$ 是最为合适的。 66 | 67 | `Permutation`的成员变量`cache`来实现高性能缓存。 68 | 69 | ```Java 70 | private final Map> cache = Maps.newHashMap(); 71 | ``` 72 | 可能你已经注意到，`cache`的键是`Integer`类型的，的确，通常`String`会更常用，然而在万次计算的场景下，`String`的拼接已经成了瓶颈。 73 | 为了实现高性能的键，`Permutation`通过位移对`Byte`数组的前3位进行扰动，确保键的唯一性和性能。 74 | 75 | ```Java 76 | private static Integer calcKey(List a){ 77 | return a.size()>=3?(a.get(0) << 6)+ (a.get(1) << 3) + a.get(2):0; 78 | } 79 | ``` 80 | 81 | `Permutation`提供了保存点来实现 $A_n^3$ 级别缓存，`CalcState` 记录了计算到第3步的状态，包括当前订单优惠金额和计算过程、已享用优惠的商品等，这些属性的保存和回放`Permutation`已经帮你做好了，`Permutation`额外提供了抽象的保存和回放方法来满足你的个性化诉求。 82 | 83 | ```Java 84 | /** 85 | * 业务将状态记录到保存点 86 | * @param state 保存点对象 87 | */ 88 | protected abstract void makeSnapshot(CalcState state,DiscountContext context); 89 | 90 | /** 91 | * 业务返回保存点状态 92 | * @param state 保存点对象 93 | */ 94 | protected abstract void backToSnapshot(CalcState state,DiscountContext context); 95 | ``` 96 | 97 | 优惠计算是有优先级的，必须保证属性`calculateGroup`值小的在前面运算，当`backToSnapshot`发生时，需要额外判断缓存中最后一个优惠和当前准备计算优惠之间的关系，若不满足则直接跳出。`checkIfWakeUpJump`方法将在缓存被使用后立刻判断是否需要继续下去。 98 | 99 | #### 上下文类 DiscountContext<T extends GoodsItem> 100 | 101 | `DiscountContext`是上下文，也是`Permutation`的成员变量，`DiscountContext`同样包含很多优化策略： 102 | 103 | - CalcStage数组 104 | 105 | 在变更最频繁也是最重要的计算步骤对象`CalcStage`使用数组存储，该数组随着上下文创建而创建，在`Permutation`中使用 106 | 107 | ```Java 108 | Arrays.fill(arr,null); 109 | ``` 110 | 111 | 将该数组清空并让它投入下一次计算，这样一次全排列过程中，数组只会被创建一次，避免了频繁创建数组带来的性能损耗。 112 | 113 | - 预计算 114 | 115 | `DiscountContext`的初始化方法是静态的`create`方法，该方法将商品和优惠进行绑定，同时执行一些用户自定义的逻辑，我们称之为`预计算`，预计算的结果会被保存在`DiscountContext`的`preCompute`属性，可以在后续的计算中直接取用，一劳永逸，避免了在后续的高速迭代中做相同的事情，比如商品分组、求和等等。 116 | 117 | #### 预计算 PreCompute<T extends GoodsItem> 118 | 119 | 预计算提供了接口，要使用预计算首先需要实现PreCompute接口 120 | 121 | ```Java 122 | public interface PreCompute { 123 | /** 124 | * 判断符合条件的活动类型，符合才会执行preComputeItems 125 | */ 126 | Set matchTypes(); 127 | 128 | /** 129 | * 对商品做一些复杂集合操作 130 | * @param items 当前参与优惠的商品 131 | * @param discount 当前优惠 132 | * @param preCompute 存储计算的结果 133 | */ 134 | void preComputeItems(List items, DiscountWrapper discount, Map preCompute); 135 | } 136 | ``` 137 | 138 | 此外需要在资源目录下建立`calculator-core.properties`文件，配置内容如下 139 | 140 | ```Java 141 | precompute.path=你要扫描的包 142 | ``` 143 | `PreComputeHolder`将处理所有的`PreCompute`实现类，只有`matchTypes`匹配的情况下`preComputeItems`方法才会被执行。 144 | 145 | ```Java 146 | public class PreComputeHolder { 147 | public static Set COMPUTES= Sets.newHashSet(); 148 | private final static String PATH = "precompute.path"; 149 | 150 | static{ 151 | Properties properties = new Properties(); 152 | try { 153 | properties = PropertiesLoaderUtils.loadProperties(new FileSystemResource(Objects.requireNonNull(PreComputeHolder.class.getClassLoader().getResource("calculator-core.properties")).getPath())); 154 | } catch (Exception ignore) { 155 | } 156 | String path = properties.getProperty(PATH); 157 | if(StringUtils.isNotBlank(path)){ 158 | Reflections reflections = new Reflections(path); 159 | Set> subTypes = reflections.getSubTypesOf(PreCompute.class); 160 | for(Class clazz:subTypes){ 161 | try { 162 | COMPUTES.add(clazz.newInstance()); 163 | } catch (Exception ignore) { 164 | } 165 | } 166 | } 167 | } 168 | } 169 | ``` 170 | 171 | #### 计算器 Calculator 172 | 173 | `Calculator`是单个优惠的计算接口，它有`calcWrap`一个方法，负责具体的优惠计算，但`calcWarp`需要承担一些内部的事情，因此我们提供了抽象类`AbstractCalculator`实现了`calcWrap`，并最终暴露了一个更简单的`calc`方法给使用者。 174 | 175 | `AbstractCalculator`的内容如下，`calcWrap`方法负责创建`CalcStage`，维护`CalcStage`数组等内部工作，这对使用者来说是透明的，使用者实现`calc`就好。 176 | 177 | ```Java 178 | public abstract class AbstractCalculator implements Calculator { 179 | public long calcWrap(DiscountContext context, DiscountWrapper discountWrapper, Map records, byte idx, int i) { 180 | CalcStage stage = new CalcStage(); 181 | CalcResult cr = context.getCalcResult(); 182 | long price= cr.getCurPrice(); 183 | stage.setBeforeCalcPrice(price); 184 | price = calc(context, discountWrapper,records, price, stage); 185 | if(price<0){ 186 | return price; 187 | } 188 | stage.setAfterCalcPrice(price); 189 | stage.setIndex(idx); 190 | stage.setStageType(discountWrapper.getType()); 191 | cr.setCurPrice(price); 192 | if(stage.getBeforeCalcPrice()>stage.getAfterCalcPrice()) { 193 | cr.getCurStages()[i] = stage; 194 | } 195 | return price; 196 | } 197 | 198 | /** 199 | * 返回该优惠下的最终要支付的金额,若不符合则返回 prevStagePrice 200 | * @param context 上下文 201 | * @param discountWrapper 优惠信息 202 | * @param records 记录享受过优惠的单品，key是calculateId，这里只提供容器，添加和判断规则由使用者自行决定 203 | * @param prevStagePrice 上一步计算的订单的价格 204 | * @param curStage 当前stage 205 | * @return 206 | */ 207 | public abstract long calc(DiscountContext context, DiscountWrapper discountWrapper, Map records, long prevStagePrice, CalcStage curStage); 208 | 209 | } 210 | 211 | ``` 212 | 最终用户继承`AbstractCalculator`，需要在`Component`注解中指定一个值，而`CalculatorRouter`将通过这个值来路由到具体的优惠计算器。这个值和`DiscountWrapper`中的`type`属性是对应的。 213 | 214 | ```Java 215 | @Component("manjian") 216 | public class ManjianCalc extends AbstractCalculator { 217 | ...... 218 | } 219 | ``` 220 | 221 | 222 | #### 共享互斥协议 DiscountGroup 223 | 224 | 共享互斥协议是一个数组，数组中最多有2个对象，最少1个对象，若只有1个对象，则该对象必然为共享组，即组内优惠可以叠加使用 225 | ```JavaScript 226 | [ 227 | { 228 | "relation": "share", 229 | "items": 230 | [ 231 | { 232 | "type": "activity0", 233 | "id": "11" 234 | } 235 | , 236 | { 237 | "type": "activity4", 238 | "id": "13" 239 | } 240 | , 241 | { 242 | "type": "coupon1", 243 | "id": "14" 244 | } 245 | ] 246 | }] 247 | ``` 248 | 相应地，数组中包含2个对象，则第1个对象的`relation`可以为`share`或者`exclude`，第二个对象的`relation`必须为`exclude` 249 | 250 | ```JavaScript 251 | [ 252 | { 253 | "relation": "share", 254 | "items": 255 | [ 256 | { 257 | "type": "activity0", 258 | "id": "11" 259 | }, 260 | { 261 | "type": "card3", 262 | "id":"12" 263 | } 264 | ] 265 | }, 266 | { 267 | "relation": "exclude", 268 | "items": 269 | [ 270 | { 271 | "type": "card1", 272 | "id": "18" 273 | }, 274 | { 275 | "type": "coupon1", 276 | "id": "22" 277 | } 278 | ] 279 | } 280 | ] 281 | ``` 282 | 最终将转化为共享组，比如上面的协议将转化为下面2个共享组 283 | 284 | `activity0-card3-card1` 285 | `activity0-card3-coupon1` 286 | 287 | 工具类 `DiscountGroupUtil` 提供了协议转共享组的方法，由于共享组可能很长，所以先和用户当前订单可享的优惠进行一个交叉过滤，为了提升过滤的性能，要将当前可用优惠转成二级`Map`，这个`Map`的外层键是协议中的`type`，第二层键是协议中的`id`。 288 | 289 | ```Java 290 | public static List,Set>> transform(List> groups, Map> inMap); 291 | ``` 292 | 为了保证算力，我们将用户本单可享的优惠分别装在2个集合中，左侧集合的大小为`SUPPORTEDSIZE`，也就是算力之内的、重点保障的优惠，而右侧的集合则尽力而为去叠加即可。 293 | 从稳定性角度来讲，我们需要给计算次数做一个统计，并在压测中摸清楚阈值，我们提供了`LimitingUtil.count`统计进入`calc`方法的次数，显然在没有开启缓存的情况下，计算次数为 $A_n^n$ x n，在开启缓存的情况下，计算次数为 $A_n^n$ x (n-3) + $A_n^3$ 294 | 295 | #### CASE 296 | 297 | 可以在`com.github.qcalculator.discount.demo`找到调用的具体case 298 | 299 | 300 | 301 | 302 | 303 | -------------------------------------------------------------------------------- /READMEIMG/211690962797_.pic.jpg: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/CyrilFeng/Q-calculator/ccece53668d33dfaef4afd28392ed9c29a1f2e27/READMEIMG/211690962797_.pic.jpg -------------------------------------------------------------------------------- /READMEIMG/q2.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/CyrilFeng/Q-calculator/ccece53668d33dfaef4afd28392ed9c29a1f2e27/READMEIMG/q2.png -------------------------------------------------------------------------------- /READMEIMG/qo.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/CyrilFeng/Q-calculator/ccece53668d33dfaef4afd28392ed9c29a1f2e27/READMEIMG/qo.png -------------------------------------------------------------------------------- /READMEIMG/rela1.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/CyrilFeng/Q-calculator/ccece53668d33dfaef4afd28392ed9c29a1f2e27/READMEIMG/rela1.png -------------------------------------------------------------------------------- /READMEIMG/vv.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/CyrilFeng/Q-calculator/ccece53668d33dfaef4afd28392ed9c29a1f2e27/READMEIMG/vv.png -------------------------------------------------------------------------------- /pom.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 5 | 6 | com.github.qcalculator 7 | 4.0.0 8 | jar 9 | calculator-core 10 | calculator 11 | 1.0-SNAPSHOT 12 | 13 | 14 | org.springframework.boot 15 | spring-boot-starter-parent 16 | 2.2.6.RELEASE 17 | 18 | 19 | 20 | 21 | UTF-8 22 | 1.8 23 | 1.8 24 | 25 | 26 | 27 | 28 | 29 | org.reflections 30 | reflections 31 | 0.10.2 32 | 33 | 34 | org.mapstruct 35 | mapstruct 36 | 1.5.5.Final 37 | 38 | 39 | org.apache.commons 40 | commons-lang3 41 | 3.12.0 42 | 43 | 44 | com.alibaba 45 | fastjson 46 | 1.2.80 47 | 48 | 49 | org.apache.commons 50 | commons-collections4 51 | 4.4 52 | 53 | 54 | com.google.guava 55 | guava 56 | 31.1-jre 57 | 58 | 59 | org.projectlombok 60 | lombok 61 | 1.18.24 62 | 63 | 64 | org.springframework.boot 65 | spring-boot-starter-web 66 | 2.2.6.RELEASE 67 | 68 | 69 | org.springframework.boot 70 | spring-boot-starter-test 71 | 2.2.6.RELEASE 72 | 73 | 74 | net.logstash.logback 75 | logstash-logback-encoder 76 | 4.9 77 | 78 | 79 | 80 | 81 | 82 | org.apache.maven.plugins 83 | maven-compiler-plugin 84 | 3.8.1 85 | 86 | 1.8 87 | 1.8 88 | 89 | 90 | org.mapstruct 91 | mapstruct-processor 92 | 1.5.5.Final 93 | 94 | 95 | org.projectlombok 96 | lombok 97 | 1.18.24 98 | 99 | 100 | org.projectlombok 101 | lombok-mapstruct-binding 102 | 0.2.0 103 | 104 | 105 | 106 | 107 | 108 | 109 | 110 | 111 | -------------------------------------------------------------------------------- /src/main/java/com/github/qcalculator/core/aware/CalculatorRouter.java: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2022 CyrilFeng 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | 17 | 18 | package com.github.qcalculator.core.aware; 19 | import com.github.qcalculator.core.discount.Calculator; 20 | import org.springframework.beans.BeansException; 21 | import org.springframework.context.ApplicationContext; 22 | import org.springframework.context.ApplicationContextAware; 23 | import org.springframework.stereotype.Component; 24 | import java.util.Map; 25 | 26 | /** 27 | 28 | * 根据注解路由到目标Calculator 29 | * @author: CyrilFeng 30 | * @date: 2022/8 31 | */ 32 | @Component 33 | @SuppressWarnings("all") 34 | public class CalculatorRouter implements ApplicationContextAware { 35 | 36 | private Map map; 37 | 38 | @Override 39 | public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { 40 | map = applicationContext.getBeansOfType(Calculator.class); 41 | } 42 | 43 | 44 | public Map getMap() { 45 | return map; 46 | } 47 | 48 | public Calculator getService(String key) { 49 | return map.get(key); 50 | } 51 | 52 | } 53 | -------------------------------------------------------------------------------- /src/main/java/com/github/qcalculator/core/discount/Calculator.java: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2022 CyrilFeng 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | 17 | package com.github.qcalculator.core.discount; 18 | import com.github.qcalculator.core.model.common.DiscountContext; 19 | import com.github.qcalculator.core.model.common.DiscountWrapper; 20 | import com.github.qcalculator.core.model.goods.GoodsItem; 21 | 22 | import java.util.Map; 23 | 24 | /** 25 | * 优惠计算器接口 26 | * @author: CyrilFeng 27 | * @date: 2022/8 28 | */ 29 | public interface Calculator { 30 | 31 | /** 32 | * 优惠计算引擎的内部方法 33 | * @param context 上下文 34 | * @param discountWrapper 当前优惠信息 35 | * @param records 参与优惠的商品记录，用于过滤 36 | * @param idx 活动的index 37 | * @param i 当前计算的索引下标，它和idx的区别在于比如有数组[9,4,6,5],则i为数组下标 i=1 时对应的idx是4 38 | */ 39 | long calcWrap(DiscountContext context, DiscountWrapper discountWrapper, Map records, byte idx, int i); 40 | } 41 | -------------------------------------------------------------------------------- /src/main/java/com/github/qcalculator/core/discount/impl/AbstractCalculator.java: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2022 CyrilFeng 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | 17 | package com.github.qcalculator.core.discount.impl; 18 | import com.github.qcalculator.core.discount.Calculator; 19 | import com.github.qcalculator.core.model.common.CalcStage; 20 | import com.github.qcalculator.core.model.common.DiscountContext; 21 | import com.github.qcalculator.core.model.common.DiscountWrapper; 22 | import com.github.qcalculator.core.model.goods.GoodsItem; 23 | import com.github.qcalculator.core.model.common.CalcResult; 24 | 25 | import java.util.Map; 26 | 27 | /** 28 | * 抽象计算器类，每种类型优惠做一个实现类，负责创建 stage，维护CalcStage[]数组等内部工作，这对使用者是透明的 29 | * @author: CyrilFeng 30 | * @date: 2022/8 31 | */ 32 | public abstract class AbstractCalculator implements Calculator { 33 | 34 | public long calcWrap(DiscountContext context, DiscountWrapper discountWrapper, Map records, byte idx, int i) { 35 | CalcStage stage = new CalcStage(); 36 | CalcResult cr = context.getCalcResult(); 37 | long price= cr.getCurPrice(); 38 | stage.setBeforeCalcPrice(price); 39 | price = calc(context, discountWrapper,records, price, stage); 40 | if(price<0){ 41 | return price; 42 | } 43 | stage.setAfterCalcPrice(price); 44 | stage.setIndex(idx); 45 | stage.setStageType(discountWrapper.getType()); 46 | cr.setCurPrice(price); 47 | if(stage.getBeforeCalcPrice()>stage.getAfterCalcPrice()) { 48 | cr.getCurStages()[i] = stage; 49 | } 50 | return price; 51 | } 52 | 53 | /** 54 | * 返回该优惠下的最终要支付的金额,若不符合则返回 prevStagePrice 55 | * @param context 上下文 56 | * @param discountWrapper 优惠信息 57 | * @param records 记录享受过优惠的单品，key是calculateId，这里只提供容器，添加和判断规则由使用者自行决定 58 | * @param prevStagePrice 上一步计算出的订单的价格 59 | * @param curStage 当前stage 60 | * @return 61 | */ 62 | public abstract long calc(DiscountContext context, DiscountWrapper discountWrapper, Map records, long prevStagePrice, CalcStage curStage); 63 | 64 | } 65 | -------------------------------------------------------------------------------- /src/main/java/com/github/qcalculator/core/enums/GoodsType.java: -------------------------------------------------------------------------------- 1 | package com.github.qcalculator.core.enums; 2 | 3 | public enum GoodsType { 4 | ALL(0,"所有商品可参与"), 5 | SELECT(1,"指定某些商品参与"), 6 | INVERT(2,"指定某些商品不参与"); 7 | 8 | private int code; 9 | private String desc; 10 | 11 | GoodsType(int code, String desc) { 12 | this.code = code; 13 | this.desc = desc; 14 | } 15 | 16 | public int getCode() { 17 | return code; 18 | } 19 | 20 | public void setCode(int code) { 21 | this.code = code; 22 | } 23 | 24 | public String getDesc() { 25 | return desc; 26 | } 27 | 28 | public void setDesc(String desc) { 29 | this.desc = desc; 30 | } 31 | } 32 | -------------------------------------------------------------------------------- /src/main/java/com/github/qcalculator/core/enums/GroupRelation.java: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2022 CyrilFeng 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | 17 | package com.github.qcalculator.core.enums; 18 | 19 | /** 20 | * 组内关系枚举 21 | * 组内关系枚举 22 | * @author: CyrilFeng 23 | * @date: 2022/8 24 | */ 25 | public enum GroupRelation { 26 | 27 | SHARE("share"), 28 | EXCLUDE("exclude"); 29 | 30 | private String type; 31 | 32 | GroupRelation(String type) { 33 | this.type = type; 34 | } 35 | 36 | public String getType() { 37 | return type; 38 | } 39 | 40 | public void setType(String type) { 41 | this.type = type; 42 | } 43 | } 44 | -------------------------------------------------------------------------------- /src/main/java/com/github/qcalculator/core/enums/ItemIdType.java: -------------------------------------------------------------------------------- 1 | package com.github.qcalculator.core.enums; 2 | 3 | public enum ItemIdType { 4 | ITEM(0,"商品ID"), 5 | SKU(1,"SKUID"), 6 | CATEGORY(2,"类目Id"); 7 | 8 | private int code; 9 | private String desc; 10 | 11 | ItemIdType(int code, String desc) { 12 | this.code = code; 13 | this.desc = desc; 14 | } 15 | 16 | public int getCode() { 17 | return code; 18 | } 19 | 20 | public void setCode(int code) { 21 | this.code = code; 22 | } 23 | 24 | public String getDesc() { 25 | return desc; 26 | } 27 | 28 | public void setDesc(String desc) { 29 | this.desc = desc; 30 | } 31 | } 32 | -------------------------------------------------------------------------------- /src/main/java/com/github/qcalculator/core/model/common/CalcResult.java: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2022 CyrilFeng 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | 17 | package com.github.qcalculator.core.model.common; 18 | 19 | import com.fasterxml.jackson.annotation.JsonIgnore; 20 | import lombok.Data; 21 | import java.io.Serializable; 22 | 23 | 24 | /** 25 | * 优惠计算结果 26 | * @author: CyrilFeng 27 | * @date: 2022/8 28 | */ 29 | @Data 30 | public class CalcResult implements Serializable { 31 | 32 | private CalcResult() { 33 | } 34 | 35 | /** 36 | * 最优实付金额 37 | */ 38 | private long finalPrice; 39 | 40 | /** 41 | * 最优优惠计算过程 42 | */ 43 | private CalcStage[] stages; 44 | 45 | /** 46 | * 当前序列计算的实付金额 47 | */ 48 | @JsonIgnore 49 | private transient long curFinalPrice; 50 | 51 | /** 52 | * 当前序列优惠计算过程 53 | */ 54 | @JsonIgnore 55 | private transient CalcStage[] curStages; 56 | 57 | /** 58 | * 实时计算价格 59 | */ 60 | @JsonIgnore 61 | private transient long curPrice; 62 | 63 | public static CalcResult create(int n){ 64 | CalcResult c=new CalcResult(); 65 | c.stages=new CalcStage[n]; 66 | c.curStages=new CalcStage[n]; 67 | return c; 68 | } 69 | 70 | } 71 | -------------------------------------------------------------------------------- /src/main/java/com/github/qcalculator/core/model/common/CalcStage.java: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2022 CyrilFeng 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | 17 | package com.github.qcalculator.core.model.common; 18 | 19 | import lombok.*; 20 | import java.io.Serializable; 21 | import java.util.Map; 22 | 23 | /** 24 | * 单个具体优惠计算明细，可以当成日志来用，用于计算过程的追溯 25 | * @author: CyrilFeng 26 | * @date: 2022/8 27 | */ 28 | @Data 29 | public class CalcStage implements Serializable { 30 | 31 | /** 32 | * 优惠前价格 33 | */ 34 | private long beforeCalcPrice; 35 | 36 | /** 37 | * 优惠后价格 38 | */ 39 | private long afterCalcPrice; 40 | 41 | /** 42 | * 优惠类型 43 | */ 44 | private String stageType; 45 | 46 | /** 47 | * 优惠索引 48 | */ 49 | private byte index; 50 | 51 | /** 52 | * 扩展属性 53 | */ 54 | private Map extra; 55 | 56 | } 57 | -------------------------------------------------------------------------------- /src/main/java/com/github/qcalculator/core/model/common/CalcState.java: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2022 CyrilFeng 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | 17 | package com.github.qcalculator.core.model.common; 18 | import com.github.qcalculator.core.model.goods.GoodsItem; 19 | import lombok.Data; 20 | import java.io.Serializable; 21 | import java.util.Map; 22 | 23 | /** 24 | * 保存点，用于缓存，入计算到第3个节点时可以将所有状态写入CalcState 25 | * @author: CyrilFeng 26 | * @date: 2022/8 27 | */ 28 | @Data 29 | public class CalcState implements Serializable { 30 | 31 | /** 32 | * 截止到保存点计算的最终优惠价格 33 | */ 34 | private long curPrice; 35 | 36 | /** 37 | * 截止到保存点计算的CalcStage 38 | */ 39 | private CalcStage[] curStages; 40 | 41 | /** 42 | * 截止到保存点的商品列表 43 | */ 44 | private Map goodsItems; 45 | 46 | /** 47 | * 截止到保存点的已计算商品列表 48 | */ 49 | private Map records; 50 | 51 | /** 52 | * 截止到保存点的扩展信息 53 | */ 54 | private Map extra; 55 | } 56 | -------------------------------------------------------------------------------- /src/main/java/com/github/qcalculator/core/model/common/DiscountConfig.java: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2022 CyrilFeng 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | 17 | package com.github.qcalculator.core.model.common; 18 | import lombok.Data; 19 | import java.io.Serializable; 20 | import java.util.List; 21 | import java.util.Map; 22 | 23 | /** 24 | * 优惠配置信息 25 | * @author: CyrilFeng 26 | * @date: 2022/7 27 | */ 28 | @Data 29 | public class DiscountConfig implements Serializable { 30 | 31 | /** 32 | * 当前优惠的优先级（如10 - 单商品组， 20 - 整单组） 33 | */ 34 | private int calculateGroup; 35 | 36 | /** 37 | * 商品限制 (0 - 所有商品可参与，1 - 指定某些商品参与， 2- 指定某些商品不参与) 38 | */ 39 | private int goodsType; 40 | 41 | /** 42 | * 下一个属性 itemIds 存放的内容是啥，（0 - 商品ID， 1 - SKUID， 2 - 类目Id） 43 | */ 44 | private int itemIdType; 45 | 46 | /** 47 | * 同上 48 | */ 49 | private List itemIds; 50 | 51 | /** 52 | * 活动信息扩展信息 53 | */ 54 | private Map extra; 55 | 56 | } 57 | -------------------------------------------------------------------------------- /src/main/java/com/github/qcalculator/core/model/common/DiscountContext.java: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2022 CyrilFeng 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | 17 | package com.github.qcalculator.core.model.common; 18 | import com.github.qcalculator.core.enums.GoodsType; 19 | import com.github.qcalculator.core.enums.ItemIdType; 20 | import com.github.qcalculator.core.model.goods.GoodsItem; 21 | import com.github.qcalculator.core.precompute.PreCompute; 22 | import com.github.qcalculator.core.precompute.PreComputeHolder; 23 | import com.google.common.collect.Lists; 24 | import com.google.common.collect.Maps; 25 | import lombok.Data; 26 | import org.apache.commons.collections4.CollectionUtils; 27 | import java.io.Serializable; 28 | import java.util.List; 29 | import java.util.Map; 30 | import java.util.stream.Collectors; 31 | 32 | /** 33 | * 优惠上下文，包含一些初始化工作、预计算等等 34 | * @author: CyrilFeng 35 | * @date: 2022/8 36 | */ 37 | @Data 38 | public class DiscountContext implements Serializable { 39 | 40 | private DiscountContext() { 41 | } 42 | 43 | /** 44 | * 原始价格 45 | */ 46 | private long originalPrice; 47 | 48 | /** 49 | * 优惠的计算结果 50 | */ 51 | private CalcResult calcResult; 52 | 53 | 54 | /** 55 | * 当前订单参与计算的商品 56 | */ 57 | private List goodsItems; 58 | 59 | /** 60 | * 当前订单可用优惠的配置 61 | */ 62 | private List discountWrappers; 63 | 64 | /** 65 | * 优惠维度进行商品分组，这样每个计算器只取自己相关的商品 66 | */ 67 | private Map> discountItemGroup; 68 | 69 | /** 70 | * 记录享受过优惠的单品，key是calculateId 71 | */ 72 | private Map records; 73 | 74 | /** 75 | * 存储预计算的结果 76 | */ 77 | private Map preCompute; 78 | 79 | /** 80 | * 扩展字段 81 | */ 82 | private Map extra; 83 | 84 | 85 | /** 86 | * 构造一个上下文 87 | * @param originalPrice 订单原始价格 88 | * @param goodsItems 可用商品列表 89 | * @param discountWrappers 可用优惠列表 90 | * @return 91 | */ 92 | public static DiscountContext create(long originalPrice, List goodsItems, List discountWrappers) { 93 | DiscountContext c=new DiscountContext<>(); 94 | c.originalPrice = originalPrice; 95 | c.records = Maps.newHashMap(); 96 | c.discountItemGroup= Maps.newHashMap(); 97 | c.calcResult=CalcResult.create(discountWrappers.size()); 98 | c.calcResult.setFinalPrice(originalPrice); 99 | c.goodsItems = goodsItems; 100 | c.discountWrappers=discountWrappers; 101 | c.preCompute = Maps.newHashMap(); 102 | //预处理优惠 103 | for(DiscountWrapper discount:discountWrappers) { 104 | initDiscount(c, discount); 105 | } 106 | return c; 107 | } 108 | 109 | 110 | /** 111 | * 对某个优惠进行初始化工作，包括商品的筛选、预计算逻辑 112 | * @param c 上下文 113 | * @param discount 当前优惠的信息 114 | */ 115 | private static void initDiscount(DiscountContext c,DiscountWrapper discount){ 116 | DiscountConfig conf = discount.getDiscountConfig(); 117 | List list = Lists.newArrayList(c.goodsItems); 118 | if(GoodsType.ALL.getCode() ==conf.getGoodsType()){ 119 | //不限制 120 | list=list.stream().sorted().collect(Collectors.toList()); 121 | }else if(GoodsType.SELECT.getCode()==conf.getGoodsType()){ 122 | if(ItemIdType.ITEM.getCode() ==conf.getItemIdType()){ 123 | list = list.stream().filter(x->conf.getItemIds(). 124 | contains(x.getGoodsId())).sorted().collect(Collectors.toList()); 125 | } else if (ItemIdType.SKU.getCode()==conf.getItemIdType()) { 126 | list = list.stream().filter(x->conf.getItemIds(). 127 | contains(x.getSkuId())).sorted().collect(Collectors.toList()); 128 | } else{ 129 | list = list.stream().filter(x-> CollectionUtils.intersection( 130 | conf.getItemIds(), x.getCategoryIds()).size()>0).sorted().collect(Collectors.toList()); 131 | } 132 | }else{ 133 | //指定不参与 134 | if(ItemIdType.ITEM.getCode()==conf.getItemIdType()){ 135 | list=list.stream().filter(x->!conf.getItemIds(). 136 | contains(x.getGoodsId())).sorted().collect(Collectors.toList()); 137 | } else if (ItemIdType.SKU.getCode()==conf.getItemIdType()) { 138 | list = list.stream().filter(x->!conf.getItemIds(). 139 | contains(x.getSkuId())).sorted().collect(Collectors.toList()); 140 | } else{ 141 | list=list.stream().filter(x-> CollectionUtils.intersection( 142 | conf.getItemIds(), x.getCategoryIds()).size()==0).sorted().collect(Collectors.toList()); 143 | } 144 | } 145 | c.discountItemGroup.put(discount.getId(), list); 146 | runPreCompute(c,discount,list); 147 | } 148 | 149 | /** 150 | * 预计算 151 | * @param c 上下文 152 | * @param discount 当前的优惠信息 153 | * @param list 当前优惠匹配的商品列表 154 | */ 155 | @SuppressWarnings("unchecked") 156 | private static void runPreCompute(DiscountContext c,DiscountWrapper discount,List list){ 157 | list = Lists.newArrayList(list); 158 | for(PreCompute e: PreComputeHolder.COMPUTES){ 159 | if(e.matchTypes().contains(discount.getType())){ 160 | e.preComputeItems(list,discount,c.preCompute); 161 | } 162 | } 163 | } 164 | 165 | } 166 | -------------------------------------------------------------------------------- /src/main/java/com/github/qcalculator/core/model/common/DiscountGroup.java: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2022 CyrilFeng 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | 17 | package com.github.qcalculator.core.model.common; 18 | import com.google.common.collect.Lists; 19 | import lombok.*; 20 | import org.apache.commons.collections4.CollectionUtils; 21 | import org.apache.commons.collections4.MapUtils; 22 | import org.apache.commons.lang3.StringUtils; 23 | import java.io.Serializable; 24 | import java.util.Iterator; 25 | import java.util.List; 26 | import java.util.Map; 27 | 28 | /** 29 | * 共享互斥组 30 | * @author: CyrilFeng 31 | * @date: 2022/8 32 | */ 33 | @Data 34 | public class DiscountGroup implements Serializable { 35 | 36 | private String relation; 37 | private List items; 38 | 39 | /** 40 | * 根据用户可用的优惠，对组内信息进行过滤 41 | * @param inMap 42 | * @return 43 | */ 44 | public List filterItems(Map> inMap){ 45 | //inMap 外层key为type，内层key为id，value为DiscountWrapper 46 | if(CollectionUtils.isEmpty(items)|| MapUtils.isEmpty(inMap)){ 47 | return null; 48 | } 49 | //构建items副本 50 | List itemsCopy = Lists.newArrayList(items); 51 | Iterator it = itemsCopy.iterator(); 52 | while(it.hasNext()){ 53 | Item item = it.next(); 54 | if(!inMap.containsKey(item.getType())){ 55 | it.remove(); 56 | continue; 57 | } 58 | if(StringUtils.isNotBlank(item.getId())){ 59 | //理论上m不可能为空 60 | Map m = inMap.get(item.getType()); 61 | if(MapUtils.isNotEmpty(m)){ 62 | if(!m.containsKey(item.getId())){ 63 | it.remove(); 64 | } 65 | } 66 | } 67 | } 68 | return itemsCopy; 69 | } 70 | } 71 | -------------------------------------------------------------------------------- /src/main/java/com/github/qcalculator/core/model/common/DiscountWrapper.java: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2022 CyrilFeng 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | 17 | package com.github.qcalculator.core.model.common; 18 | import lombok.Data; 19 | import java.io.Serializable; 20 | import java.util.Objects; 21 | 22 | /** 23 | * 优惠类 24 | * @author: CyrilFeng 25 | * @date: 2022/7 26 | */ 27 | @Data 28 | public class DiscountWrapper implements Serializable,Comparable { 29 | 30 | /** 31 | * 优惠的具体类型，CalculatorRouter会根据这个type在Calculator的实现类中扫描 32 | */ 33 | private String type; 34 | 35 | /** 36 | * 优惠的ID 37 | */ 38 | private String id; 39 | 40 | /** 41 | * 优惠的名称 42 | */ 43 | private String name; 44 | 45 | /** 46 | * 是否是必须使用的优惠 47 | */ 48 | private boolean mustUse; 49 | 50 | /** 51 | * 优惠的配置信息 52 | */ 53 | private DiscountConfig discountConfig; 54 | 55 | 56 | public static DiscountWrapper of(String type,String id,String name,boolean mustUse,DiscountConfig discountConfig){ 57 | DiscountWrapper wrapper = new DiscountWrapper(); 58 | wrapper.setType(type); 59 | wrapper.setId(id); 60 | wrapper.setName(name); 61 | wrapper.setMustUse(mustUse); 62 | wrapper.setDiscountConfig(discountConfig); 63 | return wrapper; 64 | } 65 | 66 | @Override 67 | public boolean equals(Object o) { 68 | if (this == o) return true; 69 | if (o == null || getClass() != o.getClass()) return false; 70 | DiscountWrapper wrapper = (DiscountWrapper) o; 71 | return type.equals(wrapper.type) && id.equals(wrapper.id); 72 | } 73 | 74 | @Override 75 | public int hashCode() { 76 | return Objects.hash(type, id); 77 | } 78 | 79 | @Override 80 | public int compareTo(DiscountWrapper o) { 81 | return (this.type+this.id).compareTo(o.getType()+o.getId()); 82 | } 83 | 84 | } 85 | -------------------------------------------------------------------------------- /src/main/java/com/github/qcalculator/core/model/common/Item.java: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2022 CyrilFeng 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | 17 | package com.github.qcalculator.core.model.common; 18 | import lombok.*; 19 | import java.io.Serializable; 20 | 21 | /** 22 | * 共享互斥关系中的元素 23 | * @author: CyrilFeng 24 | * @date: 2022/8 25 | */ 26 | @AllArgsConstructor 27 | @NoArgsConstructor 28 | @Getter 29 | @Setter 30 | @ToString 31 | @EqualsAndHashCode 32 | public class Item implements Serializable { 33 | /** 34 | * 优惠类型，和DiscountWrapper中的type保持一致 35 | */ 36 | private String type; 37 | 38 | /** 39 | * 优惠的ID，和DiscountWrapper中的id保持一致 40 | */ 41 | private String id; 42 | } 43 | -------------------------------------------------------------------------------- /src/main/java/com/github/qcalculator/core/model/goods/GoodsInfo.java: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2022 Shiyafeng 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | 17 | package com.github.qcalculator.core.model.goods; 18 | 19 | import com.google.common.collect.Maps; 20 | import lombok.Data; 21 | import java.io.Serializable; 22 | import java.util.List; 23 | import java.util.Map; 24 | 25 | /** 26 | * 商品信息 27 | * @author: longlian 28 | * @date: 2022/7 29 | */ 30 | @Data 31 | public class GoodsInfo implements Serializable,Cloneable { 32 | 33 | /** 34 | * 商品ID 35 | */ 36 | private Long goodsId; 37 | 38 | /** 39 | * 商品的SKUID 40 | */ 41 | private Long skuId; 42 | 43 | /** 44 | * 商品分类ID,一个商品可能出现在多个品类中 45 | */ 46 | private List categoryIds; 47 | 48 | /** 49 | * 购买数量 50 | */ 51 | private int num; 52 | 53 | /** 54 | * 商品价格，用于计算（单位：分） 55 | */ 56 | private long salePrice; 57 | 58 | /** 59 | * 商品名 60 | */ 61 | private String name; 62 | 63 | /** 64 | * 商品扩展属性 65 | */ 66 | private Map goodsExtra = Maps.newHashMap(); 67 | 68 | 69 | public static GoodsInfo of(Long goodsId,Long skuId,List categoryIds,int num,long salePrice,String name,Map goodsExtra){ 70 | GoodsInfo goodsInfo = new GoodsInfo(); 71 | goodsInfo.setGoodsId(goodsId); 72 | goodsInfo.setCategoryIds(categoryIds); 73 | goodsInfo.setNum(num); 74 | goodsInfo.setSkuId(skuId); 75 | goodsInfo.setSalePrice(salePrice); 76 | goodsInfo.setName(name); 77 | goodsInfo.setGoodsExtra(goodsExtra); 78 | return goodsInfo; 79 | } 80 | 81 | @Override 82 | public GoodsInfo clone() throws CloneNotSupportedException { 83 | return (GoodsInfo)super.clone(); 84 | } 85 | } 86 | -------------------------------------------------------------------------------- /src/main/java/com/github/qcalculator/core/model/goods/GoodsItem.java: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2022 CyrilFeng 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | 17 | package com.github.qcalculator.core.model.goods; 18 | 19 | import com.github.qcalculator.core.utils.IdGenerator; 20 | import com.google.common.collect.Lists; 21 | import com.google.common.collect.Maps; 22 | import lombok.*; 23 | import java.io.Serializable; 24 | import java.util.List; 25 | import java.util.Map; 26 | import java.util.Objects; 27 | import java.util.function.Consumer; 28 | 29 | /** 30 | * 拆分后的商品，比如一个商品GoodsInfo买了2件则会产出2个GoodsItem 31 | * @author: CyrilFeng 32 | * @date: 2022/7 33 | */ 34 | @Data 35 | public class GoodsItem extends GoodsInfo implements Serializable, Comparable,Cloneable { 36 | 37 | /** 38 | * 根据基本信息构造具体的计算商品，复制属性，以及单商品唯一id 39 | * @param calculateId 40 | * @param goodsInfo 41 | */ 42 | public GoodsItem (long calculateId, GoodsInfo goodsInfo) { 43 | this.calculateId = calculateId; 44 | this.setGoodsId(goodsInfo.getGoodsId()); 45 | this.setCategoryIds(goodsInfo.getCategoryIds()); 46 | this.setName(goodsInfo.getName()); 47 | this.setSkuId(goodsInfo.getSkuId()); 48 | this.setSalePrice(goodsInfo.getSalePrice()); 49 | } 50 | 51 | /** 52 | * 引擎计算时使用的id，每个单独商品一个 53 | */ 54 | private Long calculateId; 55 | 56 | /** 57 | * 商品扩展属性 58 | */ 59 | private Map extra = Maps.newHashMap(); 60 | 61 | /** 62 | * 根据商品信息（数量），生成计算时候需要的具体商品（单个） 63 | * @param goodsInfo 商品信息 64 | * @param idGenerator id生成器 65 | * @param consumer 在创建商品的同时对extra中的内容进行初始化 66 | */ 67 | @SuppressWarnings("unchecked") 68 | public static List generateItems(GoodsInfo goodsInfo, IdGenerator idGenerator, Consumer consumer) { 69 | if (Objects.isNull(goodsInfo)) { 70 | return Lists.newArrayList(); 71 | } 72 | List goodsItems = Lists.newArrayList(); 73 | for (int i = 0; i < goodsInfo.getNum(); i++) { 74 | T item = (T)new GoodsItem(idGenerator.nextId(),goodsInfo); 75 | consumer.accept(item); 76 | goodsItems.add(item); 77 | } 78 | return goodsItems; 79 | } 80 | 81 | @Override 82 | public boolean equals(Object o) { 83 | if (this == o) { 84 | return true; 85 | } 86 | if (o == null || getClass() != o.getClass()) { 87 | return false; 88 | } 89 | GoodsItem goodsItem = (GoodsItem) o; 90 | return Objects.equals(calculateId,goodsItem.calculateId); 91 | } 92 | 93 | @Override 94 | public int hashCode() { 95 | return Objects.hash(calculateId); 96 | } 97 | 98 | @Override 99 | public int compareTo(GoodsItem o) { 100 | return this.getCalculateId().compareTo(o.getCalculateId()); 101 | } 102 | 103 | @Override 104 | public GoodsItem clone() throws CloneNotSupportedException { 105 | return (GoodsItem)super.clone(); 106 | } 107 | 108 | } 109 | -------------------------------------------------------------------------------- /src/main/java/com/github/qcalculator/core/permutation/Permutation.java: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2022 CyrilFeng 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | 17 | package com.github.qcalculator.core.permutation; 18 | 19 | import com.github.qcalculator.core.aware.CalculatorRouter; 20 | import com.github.qcalculator.core.discount.Calculator; 21 | import com.github.qcalculator.core.model.common.*; 22 | import com.github.qcalculator.core.model.goods.GoodsItem; 23 | import com.google.common.collect.Collections2; 24 | import com.google.common.collect.Maps; 25 | import com.google.common.collect.Sets; 26 | import org.apache.commons.collections4.CollectionUtils; 27 | import java.util.*; 28 | import java.util.stream.Collectors; 29 | import java.util.stream.IntStream; 30 | 31 | 32 | /** 33 | * 全排列计算引擎 34 | * @author: CyrilFeng 35 | * @date: 2022/8 36 | */ 37 | 38 | @SuppressWarnings("all") 39 | public abstract class Permutation { 40 | 41 | /** 42 | * 根据注解路由到目标Calculator 43 | */ 44 | private CalculatorRouter calculatorRouter; 45 | 46 | /** 47 | * 上下文 48 | */ 49 | private DiscountContext context; 50 | 51 | /** 52 | * 必须使用的优惠，比如用户手动选择的优惠 53 | */ 54 | private final Set mustUseSet = Sets.newHashSet(); 55 | 56 | /** 57 | * 缓存，key是calcKey生成的数字，value是保存点 58 | */ 59 | private final Map> cache = Maps.newHashMap(); 60 | 61 | /** 62 | * 将calculatorRouter绑定到当前Permutation 63 | * @param calculatorRouter 路由器 64 | * @return 65 | */ 66 | public Permutation build(CalculatorRouter calculatorRouter){ 67 | this.calculatorRouter=calculatorRouter; 68 | return this; 69 | } 70 | 71 | /** 72 | * 1-SUPPORTEDSIZE 之间所有排列组合的记录 73 | */ 74 | private final static Map>> PERMUTATIONS = Maps.newHashMap(); 75 | 76 | /** 77 | * 最大支持的共享组长度 78 | */ 79 | public final static int SUPPORTEDSIZE = 7; 80 | 81 | static{ 82 | //前置计算 1-SUPPORTEDSIZE 之间所有排列组合 83 | for(byte i=1;i<=SUPPORTEDSIZE;i++){ 84 | PERMUTATIONS.put((int)i,Collections2.permutations(IntStream.range(0,i).boxed() 85 | .map(x->(byte)x.intValue()).collect(Collectors.toList()))); 86 | } 87 | } 88 | 89 | 90 | /** 91 | * 计算最优解 92 | * @param context 上下文 93 | * @return 94 | */ 95 | public void perm(DiscountContext context){ 96 | int size=context.getDiscountWrappers().size(); 97 | this.context = context; 98 | loadMustUseDiscount(); 99 | if(size==0){ 100 | return ; 101 | } 102 | Collection> list = PERMUTATIONS.get(size); 103 | for(List a:list) { 104 | boolean isBetter = executeCalc(this.context, a); 105 | if (isBetter) { 106 | //若出现比当前结果更优的结果则替换 107 | updateRecord(this.context.getCalcResult()); 108 | } 109 | } 110 | cache.clear(); 111 | mustUseSet.clear(); 112 | } 113 | 114 | private void loadMustUseDiscount(){ 115 | for(int i=0;i a){ 126 | return a.size()>=3?(a.get(0) << 6)+ (a.get(1) << 3) + a.get(2):0; 127 | } 128 | 129 | /** 130 | * 若出现比当前结果更优的结果则替换 131 | * @param result 当前的计算结果 132 | */ 133 | private void updateRecord(CalcResult result){ 134 | result.setFinalPrice(result.getCurFinalPrice()); 135 | System.arraycopy(result.getCurStages(),0,result.getStages(),0,result.getStages().length); 136 | } 137 | 138 | private void cacheSnapshot(List a,int i,Integer k){ 139 | if(enableOptimize(a)&&i==2&&!cache.containsKey(k)){ 140 | cache.put(k,makeSnapshot()); 141 | } 142 | } 143 | 144 | private void initInner(boolean canOptimize,Integer k){ 145 | if(canOptimize){ 146 | //若可优化则还原之前的保存点 147 | backToSnapshot(k); 148 | }else{ 149 | //若不可优化则老老实实初始化 150 | initCtx(); 151 | } 152 | } 153 | 154 | private boolean calcInner(Calculator calculator,DiscountWrapper wrapper,List a,int i){ 155 | long price = calculator.calcWrap(context, wrapper, context.getRecords(), a.get(i), i); 156 | if (price < 0) { 157 | return false; 158 | } 159 | if(inextOrder){ 163 | //优先级不符合则跳出 164 | return false; 165 | } 166 | } 167 | return true; 168 | } 169 | 170 | /** 171 | * 根据数组顺序执行计算器 172 | */ 173 | public boolean executeCalc(DiscountContext context,List a){ 174 | Integer k = calcKey(a); 175 | boolean canOptimize = enableOptimize(a)&&cache.containsKey(k); 176 | initInner(canOptimize,k); 177 | for(int i=canOptimize?3:0;i calculator = (Calculator) calculatorRouter.getService(wrapper.getType()); 180 | //路由目标的计算器实现 181 | if(canOptimize&&checkIfWakeUpJump(context.getDiscountWrappers().get(a.get(2)),wrapper)){ 182 | //还原保存点后，比较保存点的最后一个优惠节点和当前优惠的优先级，如不符合则跳出 183 | break; 184 | } 185 | if(Objects.nonNull(calculator)){ 186 | //执行计算器 187 | if(!calcInner(calculator,wrapper,a,i)){ 188 | return false; 189 | } 190 | //优惠长度为5、6、7 将开启优化，只缓存走到第3个节点的部分 191 | cacheSnapshot(a,i,k); 192 | } 193 | } 194 | long curPrice = context.getCalcResult().getCurPrice(); 195 | context.getCalcResult().setCurFinalPrice(curPrice); 196 | CalcStage[] stages = context.getCalcResult().getCurStages(); 197 | return curPricewrapper.getDiscountConfig().getCalculateGroup(); 209 | } 210 | 211 | 212 | /** 213 | * 全排列计算后判断位置是否匹配 214 | * @param stages 当前stage数组 215 | * @param pos 必须使用的优惠索引 216 | * @return 217 | */ 218 | private boolean isMustUse(CalcStage[] stages,Set pos){ 219 | int c=0; 220 | for(CalcStage stage:stages){ 221 | if(Objects.isNull(stage)){ 222 | continue; 223 | } 224 | if(pos.contains(stage.getIndex())){ 225 | c++; 226 | } 227 | } 228 | return c==pos.size(); 229 | } 230 | 231 | 232 | /** 233 | * 初始化上下文，清理上一排列留下的脏数据 234 | */ 235 | private void initCtx(){ 236 | context.getCalcResult().setCurPrice(context.getOriginalPrice()); 237 | CalcStage[] curArr =context.getCalcResult().getCurStages(); 238 | //每次排列计算前初始化curStages为null 239 | Arrays.fill(curArr,null); 240 | //每次排列计算前reset usedList 中的单品价格，并清空 241 | context.getGoodsItems().forEach(this::resetItems); 242 | //清空黑名单 243 | context.getRecords().clear(); 244 | //初始化Context 245 | resetContext(context); 246 | } 247 | 248 | /** 249 | * 构建保存点 250 | */ 251 | private CalcState makeSnapshot(){ 252 | CalcState state = new CalcState<>(); 253 | state.setCurPrice(context.getCalcResult().getCurPrice()); 254 | state.setCurStages(copyStage(context.getCalcResult().getCurStages())); 255 | state.setRecords(copyRecord(context.getRecords())); 256 | makeSnapshot(state,context); 257 | return state; 258 | } 259 | 260 | 261 | /** 262 | * 返回保存点 263 | * @param k 缓存的key 264 | */ 265 | private void backToSnapshot(Integer k){ 266 | CalcState state=(CalcState)cache.get(k); 267 | context.getCalcResult().setCurPrice(state.getCurPrice()); 268 | context.getCalcResult().setCurStages(copyStage(state.getCurStages())); 269 | context.setRecords(copyRecord(state.getRecords())); 270 | backToSnapshot(state,context); 271 | } 272 | 273 | 274 | /** 275 | * 复制stages 276 | * @param curStages 当前stages 277 | */ 278 | private CalcStage[] copyStage(CalcStage[] curStages){ 279 | CalcStage[] cs=new CalcStage[curStages.length]; 280 | System.arraycopy(curStages,0,cs,0,curStages.length); 281 | return cs; 282 | } 283 | 284 | /** 285 | * clone商品当前状态，转成map便于查找 286 | * @param goods 商品列表 287 | * @return 288 | */ 289 | protected Map copyGoods(List goods){ 290 | Map map=Maps.newHashMap(); 291 | for(T good:goods){ 292 | try { 293 | map.put(good.getCalculateId(),(T)good.clone()); 294 | } catch (Exception ignore) { 295 | } 296 | } 297 | return map; 298 | } 299 | 300 | /** 301 | * 复制享受过优惠的商品记录，只用到calculateId，因此不对对象进行clone 302 | * @param records 享受过优惠的商品记录 303 | */ 304 | private Map copyRecord(Map records){ 305 | return Maps.newHashMap(records); 306 | } 307 | 308 | /** 309 | * 相同最优解的处理逻辑，交给业务来实现 310 | * @param stages 最终的stage数组 311 | * @param curStages 当前的stage数组 312 | * @return 313 | */ 314 | protected abstract boolean sameOptimumCondition(CalcStage[] curStages); 315 | 316 | /** 317 | * context参数的重置逻辑，交给业务来实现 318 | * @param context 上下文 319 | */ 320 | protected abstract void resetContext(DiscountContext context); 321 | 322 | /** 323 | * 开启缓存的条件,如 a.size>4 324 | * @param a 优惠排列 325 | */ 326 | protected abstract boolean enableOptimize(List a); 327 | 328 | /** 329 | * 商品参数的重置逻辑，交给业务来实现 330 | * @param item 单品 331 | */ 332 | protected abstract void resetItems(T item); 333 | 334 | /** 335 | * 业务将状态记录到保存点 336 | * @param state 保存点对象 337 | */ 338 | protected abstract void makeSnapshot(CalcState state,DiscountContext context); 339 | 340 | /** 341 | * 业务返回保存点状态 342 | * @param state 保存点对象 343 | */ 344 | protected abstract void backToSnapshot(CalcState state,DiscountContext context); 345 | } 346 | -------------------------------------------------------------------------------- /src/main/java/com/github/qcalculator/core/precompute/PreCompute.java: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2022 CyrilFeng 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | 17 | package com.github.qcalculator.core.precompute; 18 | 19 | import com.github.qcalculator.core.model.common.DiscountWrapper; 20 | import com.github.qcalculator.core.model.goods.GoodsItem; 21 | 22 | import java.util.List; 23 | import java.util.Map; 24 | import java.util.Set; 25 | 26 | /** 27 | * 预计算，把一些耗时操作放在Context中操作 28 | * @author: CyrilFeng 29 | * @date: 2022/8 30 | */ 31 | public interface PreCompute { 32 | 33 | /** 34 | * 判断符合条件的活动类型，符合才会执行preComputeItems 35 | */ 36 | Set matchTypes(); 37 | 38 | /** 39 | * 对商品做一些复杂集合操作 40 | * @param items 当前参与优惠的商品 41 | * @param discount 当前优惠 42 | * @param preCompute 存储计算的结果 43 | */ 44 | void preComputeItems(List items, DiscountWrapper discount, Map preCompute); 45 | } 46 | -------------------------------------------------------------------------------- /src/main/java/com/github/qcalculator/core/precompute/PreComputeHolder.java: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2022 CyrilFeng 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | 17 | package com.github.qcalculator.core.precompute; 18 | import com.google.common.collect.Sets; 19 | import org.apache.commons.lang3.StringUtils; 20 | import org.reflections.Reflections; 21 | import org.springframework.core.io.FileSystemResource; 22 | import org.springframework.core.io.support.PropertiesLoaderUtils; 23 | import java.util.Objects; 24 | import java.util.Properties; 25 | import java.util.Set; 26 | 27 | /** 28 | * PreCompute实现类的加载器，会扫描calculator-core文件中的precompute.path属性 29 | * @author: CyrilFeng 30 | * @date: 2022/8 31 | */ 32 | @SuppressWarnings("all") 33 | public class PreComputeHolder { 34 | public static Set COMPUTES= Sets.newHashSet(); 35 | private final static String PATH = "precompute.path"; 36 | 37 | static{ 38 | Properties properties = new Properties(); 39 | try { 40 | properties = PropertiesLoaderUtils.loadProperties(new FileSystemResource(Objects.requireNonNull(PreComputeHolder.class.getClassLoader().getResource("calculator-core.properties")).getPath())); 41 | } catch (Exception ignore) { 42 | } 43 | String path = properties.getProperty(PATH); 44 | if(StringUtils.isNotBlank(path)){ 45 | Reflections reflections = new Reflections(path); 46 | Set> subTypes = reflections.getSubTypesOf(PreCompute.class); 47 | for(Class clazz:subTypes){ 48 | try { 49 | COMPUTES.add(clazz.newInstance()); 50 | } catch (Exception ignore) { 51 | } 52 | } 53 | } 54 | } 55 | } 56 | -------------------------------------------------------------------------------- /src/main/java/com/github/qcalculator/core/utils/DiscountGroupUtil.java: -------------------------------------------------------------------------------- 1 | 2 | 3 | package com.github.qcalculator.core.utils; 4 | import com.github.qcalculator.core.model.common.DiscountGroup; 5 | import com.github.qcalculator.core.model.common.DiscountWrapper; 6 | import com.github.qcalculator.core.model.common.Item; 7 | import com.github.qcalculator.core.permutation.Permutation; 8 | import com.google.common.collect.Lists; 9 | import com.google.common.collect.Maps; 10 | import com.google.common.collect.Sets; 11 | import com.google.common.util.concurrent.AtomicLongMap; 12 | import org.apache.commons.collections4.CollectionUtils; 13 | import org.apache.commons.collections4.MapUtils; 14 | import org.apache.commons.lang3.tuple.Pair; 15 | import java.util.*; 16 | import java.util.stream.Collectors; 17 | 18 | 19 | public class DiscountGroupUtil { 20 | 21 | private static final String EXCLUDE="exclude"; 22 | 23 | /** 24 | * 返回所有共享组 25 | * Pair的left是长度不超过 Permutation.SUPPORTEDSIZE 的内容，right是第 Permutation.SUPPORTEDSIZE+1 26 | * 种优惠即其他优惠（若有），即不参与全排列的优惠 27 | * @param groups 28 | * @param inMap 29 | * @return 30 | */ 31 | public static List,Set>> transform(List> groups, Map> inMap) { 32 | List,Set>> resultList = Lists.newArrayList(); 33 | List> list = mergeGroups(groups,inMap); 34 | if(CollectionUtils.isEmpty(list)){ 35 | return Lists.newArrayList(); 36 | } 37 | for(List items:list){ 38 | Set discountWrappers = items.stream().map(x->{ 39 | if(inMap.containsKey(x.getType())){ 40 | Map m=inMap.get(x.getType()); 41 | if(m.containsKey(x.getId())){ 42 | return m.get(x.getId()); 43 | } 44 | } 45 | return null; 46 | }).filter(Objects::nonNull).collect(Collectors.toSet()); 47 | if(CollectionUtils.isNotEmpty(discountWrappers) && discountWrappers.size()>=2){ 48 | if(discountWrappers.size()> Permutation.SUPPORTEDSIZE) { 49 | resultList.add(balanceLR(discountWrappers)); 50 | }else{ 51 | resultList.add(Pair.of(discountWrappers, Sets.newHashSet())); 52 | } 53 | } 54 | } 55 | //优先计算短的共享组 56 | return resultList.stream().sorted(Comparator.comparing(x->x.getLeft().size(),Collections.reverseOrder())).collect(Collectors.toList()); 57 | } 58 | 59 | /** 60 | * 保证mustuse的优惠进入left集合 61 | * @param discountWrappers 当前可用优惠 62 | */ 63 | private static Pair,Set> balanceLR(Set discountWrappers){ 64 | Set left=Sets.newHashSet(); 65 | Set right=Sets.newHashSet(); 66 | for(DiscountWrapper wrapper:discountWrappers){ 67 | if(wrapper.isMustUse()){ 68 | left.add(wrapper); 69 | }else{ 70 | right.add(wrapper); 71 | } 72 | } 73 | if(left.size() it = right.iterator(); 76 | while (c>0&&it.hasNext()){ 77 | DiscountWrapper w = it.next(); 78 | left.add(w); 79 | it.remove(); 80 | c--; 81 | } 82 | }else if(left.size()>Permutation.SUPPORTEDSIZE){ 83 | int c = left.size()-Permutation.SUPPORTEDSIZE; 84 | Iterator it = left.iterator(); 85 | while (c>0&&it.hasNext()){ 86 | DiscountWrapper w = it.next(); 87 | right.add(w); 88 | it.remove(); 89 | c--; 90 | } 91 | } 92 | return Pair.of(left,right); 93 | } 94 | 95 | /** 96 | * 合并规则转化为共享组 97 | * @param groups 所有规则大组 98 | * @param inMap 实际可用优惠 99 | */ 100 | private static List> mergeGroups(List> groups,Map> inMap){ 101 | if(CollectionUtils.isEmpty(groups) || MapUtils.isEmpty(inMap)){ 102 | return null; 103 | } 104 | //resultList 接收最终的结果 105 | List> resultList = Lists.newArrayList(); 106 | //ctx 全局计数器，对于独立共享组多次被使用进行删除（唯一需要去重的场景） 107 | AtomicLongMap ctx = AtomicLongMap.create(); 108 | //索引，存放可能需要删除的key 109 | Map idxMap = Maps.newHashMap(); 110 | for(List list:groups){ 111 | mergeGroup(list,inMap,ctx,idxMap,resultList); 112 | } 113 | Map map = ctx.asMap(); 114 | List orderedList = Lists.newArrayList(); 115 | for(Map.Entry e:map.entrySet()){ 116 | Integer idx = idxMap.get(e.getKey()); 117 | if(Objects.nonNull(idx)&&e.getValue()>1){ 118 | orderedList.add(idx); 119 | } 120 | } 121 | orderedList.sort(Collections.reverseOrder()); 122 | //从后往前删除，否则索引会出问题 123 | for(Integer i:orderedList){ 124 | resultList.remove(i.intValue()); 125 | } 126 | return resultList.stream().filter(CollectionUtils::isNotEmpty).collect(Collectors.toList()); 127 | } 128 | 129 | private static void mergeGroup(List groups,Map> inMap, 130 | AtomicLongMap ctx,Map idxMap, 131 | List> resultList){ 132 | if(CollectionUtils.isEmpty(groups)){ 133 | return ; 134 | } 135 | List xList = groups.get(0).filterItems(inMap); 136 | if(CollectionUtils.isEmpty(xList)){ 137 | return ; 138 | } 139 | if(groups.size()==1){ 140 | //必然是共享组 141 | //存入全局上下文，去重时使用，这里累计次数，若次数大于1，需要在最外层移除此共享组 142 | String key = uniqueKey(xList); 143 | ctx.incrementAndGet(key); 144 | //记录索引,以便删除 145 | idxMap.put(key,resultList.size()); 146 | resultList.add(xList); 147 | }else{ 148 | //yList必然是互斥的 149 | List yList = groups.get(1).filterItems(inMap); 150 | if(Objects.equals(EXCLUDE,groups.get(0).getRelation())){ 151 | //产品设计规避了重复的情况，无需去重 152 | for(Item item:xList){ 153 | for(Item item1:yList){ 154 | resultList.add(Lists.newArrayList(item,item1)); 155 | } 156 | } 157 | }else{ 158 | //存入全局上下文，去重时使用，这里累计次数，若次数大于1，需要在最外层移除此共享组 159 | String k = uniqueKey(xList); 160 | for(Item item:yList){ 161 | ctx.incrementAndGet(k); 162 | List xCopy = Lists.newArrayList(xList); 163 | xCopy.add(item); 164 | resultList.add(xCopy); 165 | } 166 | } 167 | } 168 | } 169 | 170 | private static String uniqueKey(List list){ 171 | return list.stream().map(i->i.getType()+i.getId()).sorted().collect(Collectors.joining()); 172 | } 173 | 174 | } 175 | -------------------------------------------------------------------------------- /src/main/java/com/github/qcalculator/core/utils/IdGenerator.java: -------------------------------------------------------------------------------- 1 | 2 | 3 | package com.github.qcalculator.core.utils; 4 | 5 | /** 6 | * ID生成器，用于生成每次计算的商品id 7 | * 非线程安全，不可在多线程共享。 每次计算创建一个，用于生成具体每一个商品的唯一ID 8 | * @author: longlian 9 | * @date: 2022/7 10 | */ 11 | public class IdGenerator { 12 | 13 | /** 14 | * 新建一个对象，默认构造 15 | */ 16 | public static IdGenerator getInstance() { 17 | return new IdGenerator(); 18 | } 19 | 20 | /** 21 | * 当前ID，默认从1开始 22 | */ 23 | private long currentId = 1; 24 | 25 | /** 26 | * 按序列生成一个ID 27 | */ 28 | public long nextId() { 29 | return currentId++; 30 | } 31 | } 32 | -------------------------------------------------------------------------------- /src/main/java/com/github/qcalculator/core/utils/LimitingUtil.java: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2022 CyrilFeng 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | 17 | package com.github.qcalculator.core.utils; 18 | 19 | import java.util.ArrayList; 20 | import java.util.List; 21 | 22 | /** 23 | * 统计计算次数的工具，在机器负载较大时，作为放弃后面计算的条件 24 | * @author: CyrilFeng 25 | * @date: 2022/8 26 | */ 27 | public class LimitingUtil { 28 | 29 | /** 30 | * 统计计算次数 31 | * 根据性能压测结果，对于多个共享组来说是必要的 32 | * @param length 共享组的长度 33 | */ 34 | public static int count(int length){ 35 | switch (length){ 36 | case 1:return 1; 37 | //下面的计算公式是 x!*x 38 | case 2:return 4; 39 | case 3:return 18; 40 | //下面的计算公式是 x!*(x-3)+p(x,3) 41 | case 4:return 48; 42 | case 5:return 300; 43 | case 6:return 2280; 44 | case 7:return 20370; 45 | default:return 0; 46 | } 47 | } 48 | } 49 | -------------------------------------------------------------------------------- /src/main/java/com/github/qcalculator/demo/App.java: -------------------------------------------------------------------------------- 1 | package com.github.qcalculator.demo; 2 | 3 | import org.springframework.boot.SpringApplication; 4 | import org.springframework.boot.autoconfigure.SpringBootApplication; 5 | import org.springframework.context.annotation.ComponentScan; 6 | 7 | @SpringBootApplication 8 | @ComponentScan("com.github.qcalculator") 9 | public class App 10 | { 11 | public static void main( String[] args ) 12 | { 13 | SpringApplication.run(App.class,args); 14 | } 15 | } 16 | -------------------------------------------------------------------------------- /src/main/java/com/github/qcalculator/demo/biz/Flowable.java: -------------------------------------------------------------------------------- 1 | package com.github.qcalculator.demo.biz; 2 | 3 | import com.github.qcalculator.core.model.common.CalcStage; 4 | import com.github.qcalculator.core.model.common.CalcState; 5 | import com.github.qcalculator.core.model.common.DiscountContext; 6 | import com.github.qcalculator.core.model.goods.GoodsItem; 7 | import com.github.qcalculator.core.permutation.Permutation; 8 | import com.github.qcalculator.demo.biz.constant.Constant; 9 | 10 | import java.util.List; 11 | 12 | public class Flowable extends Permutation { 13 | @Override 14 | protected boolean enableOptimize(List a) { 15 | return false; 16 | } 17 | 18 | @Override 19 | protected boolean sameOptimumCondition(CalcStage[] curStages) { 20 | return false; 21 | } 22 | 23 | @Override 24 | protected void resetContext(DiscountContext context) { 25 | 26 | } 27 | 28 | @Override 29 | protected void resetItems(GoodsItem item) { 30 | item.getExtra().put(Constant.UPDATEABLEPRICE,item.getSalePrice()); 31 | } 32 | 33 | @Override 34 | protected void makeSnapshot(CalcState state, DiscountContext context) { 35 | 36 | } 37 | 38 | @Override 39 | protected void backToSnapshot(CalcState state, DiscountContext context) { 40 | 41 | } 42 | 43 | 44 | } 45 | -------------------------------------------------------------------------------- /src/main/java/com/github/qcalculator/demo/biz/TestController.java: -------------------------------------------------------------------------------- 1 | package com.github.qcalculator.demo.biz; 2 | 3 | import com.github.qcalculator.core.enums.GroupRelation; 4 | import com.github.qcalculator.core.model.common.*; 5 | import com.github.qcalculator.core.model.goods.GoodsInfo; 6 | import com.github.qcalculator.core.model.goods.GoodsItem; 7 | import com.github.qcalculator.core.utils.DiscountGroupUtil; 8 | import com.github.qcalculator.core.utils.IdGenerator; 9 | import com.github.qcalculator.core.utils.LimitingUtil; 10 | import com.github.qcalculator.demo.biz.constant.Constant; 11 | import com.github.qcalculator.core.aware.CalculatorRouter; 12 | import com.google.common.collect.ImmutableMap; 13 | import com.google.common.collect.Lists; 14 | import org.apache.commons.lang3.tuple.Pair; 15 | import org.springframework.stereotype.Controller; 16 | import org.springframework.web.bind.annotation.RequestMapping; 17 | import org.springframework.web.bind.annotation.ResponseBody; 18 | 19 | import java.util.*; 20 | import java.util.stream.Collectors; 21 | 22 | @Controller 23 | public class TestController { 24 | 25 | private final CalculatorRouter calculatorRouter; 26 | 27 | public TestController(CalculatorRouter calculatorRouter) { 28 | this.calculatorRouter = calculatorRouter; 29 | } 30 | 31 | @RequestMapping("test") 32 | @ResponseBody 33 | public Object test() { 34 | //mock商品 35 | List items = mockItems(); 36 | //mock组关系并转化为共享组 37 | List,Set>> pairs = transform(mockGroups()); 38 | //全局最优计算过程 39 | List globalStages=Lists.newArrayList(); 40 | int count = 0; 41 | //订单总金额 42 | long totalPrice = items.stream().mapToLong(GoodsInfo::getSalePrice).sum(); 43 | long globalPrice = totalPrice; 44 | //构建计算流 45 | Flowable flowable = (Flowable) new Flowable().build(calculatorRouter); 46 | for(Pair,Set> set:pairs) { 47 | //统计算力 48 | count += LimitingUtil.count(set.getLeft().size()); 49 | if(count>100000){ 50 | break; 51 | } 52 | List wrappers = Lists.newArrayList(set.getLeft()); 53 | DiscountContext ctx = DiscountContext.create(totalPrice, Lists.newArrayList(items), wrappers); 54 | flowable.perm(ctx); 55 | if(ctx.getCalcResult().getFinalPrice() < globalPrice) { 56 | globalStages = Arrays.asList(ctx.getCalcResult().getStages()); 57 | globalPrice = ctx.getCalcResult().getFinalPrice(); 58 | } 59 | } 60 | return Pair.of(globalPrice,globalStages); 61 | } 62 | 63 | private List> mockGroups(){ 64 | List> groups = Lists.newArrayList(); 65 | DiscountGroup group = new DiscountGroup(); 66 | group.setRelation(GroupRelation.SHARE.getType()); 67 | group.setItems(Lists.newArrayList(new Item("zhekou","1"),new Item("manjian","2"),new Item("manzeng","3"))); 68 | groups.add(Lists.newArrayList(group)); 69 | return groups; 70 | } 71 | 72 | private List mockItems(){ 73 | IdGenerator idGenerator = IdGenerator.getInstance(); 74 | GoodsInfo goodsInfo = GoodsInfo.of(1001L,2001L,null,4,20 * 100,"产品1",null); 75 | GoodsInfo goodsInfo2 = GoodsInfo.of(1001L,2002L,null,2,10 * 100,"产品1",null); 76 | List items = GoodsItem.generateItems(goodsInfo,idGenerator,x->x.getExtra().put(Constant.UPDATEABLEPRICE,x.getSalePrice())); 77 | items.addAll(GoodsItem.generateItems(goodsInfo2,idGenerator,x->x.getExtra().put(Constant.UPDATEABLEPRICE,x.getSalePrice()))); 78 | return items; 79 | } 80 | 81 | private List,Set>> transform(List> groups){ 82 | List wrapperList = Lists.newArrayList( 83 | DiscountWrapper.of("zhekou", "1", "折扣", false, new DiscountConfig()), 84 | DiscountWrapper.of("manjian", "2", "满减", false, new DiscountConfig()) 85 | ); 86 | Map> inMap = wrapperList.stream().collect(Collectors.toMap(DiscountWrapper::getType, x->ImmutableMap.of(x.getId(),x))); 87 | return DiscountGroupUtil.transform(groups,inMap); 88 | } 89 | 90 | } 91 | -------------------------------------------------------------------------------- /src/main/java/com/github/qcalculator/demo/biz/calc/ManjianCalc.java: -------------------------------------------------------------------------------- 1 | package com.github.qcalculator.demo.biz.calc; 2 | 3 | import com.github.qcalculator.core.discount.impl.AbstractCalculator; 4 | import com.github.qcalculator.core.model.common.CalcStage; 5 | import com.github.qcalculator.core.model.common.DiscountContext; 6 | import com.github.qcalculator.core.model.common.DiscountWrapper; 7 | import com.github.qcalculator.core.model.goods.GoodsItem; 8 | import com.github.qcalculator.demo.biz.constant.Constant; 9 | import com.google.common.collect.Lists; 10 | import org.springframework.stereotype.Component; 11 | import java.util.List; 12 | import java.util.Map; 13 | 14 | @Component("manjian") 15 | public class ManjianCalc extends AbstractCalculator { 16 | 17 | @Override 18 | public long calc(DiscountContext context, DiscountWrapper discountWrapper, Map records, long prevStagePrice, CalcStage curStage) { 19 | List items = Lists.newArrayList(context.getDiscountItemGroup().get(discountWrapper.getId())); 20 | if(prevStagePrice>=100*100) { 21 | prevStagePrice = prevStagePrice - 20 * 100; 22 | } 23 | //均摊 24 | for(GoodsItem item:items){ 25 | item.getExtra().put(Constant.UPDATEABLEPRICE,(long)item.getExtra().get(Constant.UPDATEABLEPRICE)-(long)(20*100/items.size())); 26 | } 27 | return prevStagePrice; 28 | } 29 | } 30 | -------------------------------------------------------------------------------- /src/main/java/com/github/qcalculator/demo/biz/calc/ZhekouCalc.java: -------------------------------------------------------------------------------- 1 | package com.github.qcalculator.demo.biz.calc; 2 | 3 | import com.github.qcalculator.core.discount.impl.AbstractCalculator; 4 | import com.github.qcalculator.core.model.common.CalcStage; 5 | import com.github.qcalculator.core.model.common.DiscountContext; 6 | import com.github.qcalculator.core.model.common.DiscountWrapper; 7 | import com.github.qcalculator.core.model.goods.GoodsItem; 8 | import com.github.qcalculator.demo.biz.constant.Constant; 9 | import com.google.common.collect.Lists; 10 | import org.apache.commons.collections4.CollectionUtils; 11 | import org.springframework.stereotype.Component; 12 | import java.util.Collection; 13 | import java.util.List; 14 | import java.util.Map; 15 | 16 | @Component("zhekou") 17 | @SuppressWarnings("unchecked") 18 | public class ZhekouCalc extends AbstractCalculator { 19 | 20 | @Override 21 | public long calc(DiscountContext context, DiscountWrapper discountWrapper, Map records, long prevStagePrice, CalcStage curStage) { 22 | List items = Lists.newArrayList(context.getDiscountItemGroup().get(discountWrapper.getId())); 23 | Map> map = (Map>)context.getPreCompute().get("GroupBySkuIdPreCompute"); 24 | long maxPrice = 0L; 25 | Collection group = CollectionUtils.EMPTY_COLLECTION; 26 | for(Collection c:map.values()){ 27 | long tmp = (long)c.iterator().next().getExtra().get(Constant.UPDATEABLEPRICE); 28 | if(tmp>maxPrice){ 29 | maxPrice=tmp; 30 | group = c; 31 | } 32 | } 33 | long discount = (long)(maxPrice*group.size()*0.2); 34 | //均摊 35 | for (GoodsItem item : group) { 36 | item.getExtra().put(Constant.UPDATEABLEPRICE, (long) item.getExtra().get(Constant.UPDATEABLEPRICE) - discount / items.size()); 37 | } 38 | return prevStagePrice-discount; 39 | } 40 | } 41 | -------------------------------------------------------------------------------- /src/main/java/com/github/qcalculator/demo/biz/constant/Constant.java: -------------------------------------------------------------------------------- 1 | package com.github.qcalculator.demo.biz.constant; 2 | 3 | public class Constant { 4 | 5 | public static final String UPDATEABLEPRICE = "updateablePrice"; 6 | 7 | } 8 | -------------------------------------------------------------------------------- /src/main/java/com/github/qcalculator/demo/biz/precompute/PreGroupBy.java: -------------------------------------------------------------------------------- 1 | package com.github.qcalculator.demo.biz.precompute; 2 | 3 | import com.github.qcalculator.core.model.common.DiscountWrapper; 4 | import com.github.qcalculator.core.model.goods.GoodsInfo; 5 | import com.github.qcalculator.core.model.goods.GoodsItem; 6 | import com.github.qcalculator.core.precompute.PreCompute; 7 | import com.google.common.collect.Sets; 8 | import java.util.List; 9 | import java.util.Map; 10 | import java.util.Set; 11 | import java.util.stream.Collectors; 12 | 13 | public class PreGroupBy implements PreCompute { 14 | @Override 15 | public Set matchTypes() { 16 | return Sets.newHashSet("zhekou"); 17 | } 18 | 19 | @Override 20 | public void preComputeItems(List items, DiscountWrapper discount, Map preCompute) { 21 | preCompute.put("GroupBySkuIdPreCompute",items.stream().collect(Collectors.groupingBy 22 | (GoodsInfo::getSkuId,Collectors.collectingAndThen(Collectors.toList(), 23 | e->e.stream().sorted().collect(Collectors.toList()))))); 24 | } 25 | } 26 | -------------------------------------------------------------------------------- /src/main/resources/calculator-core.properties: -------------------------------------------------------------------------------- 1 | precompute.path=com.github.qcalculator.demo.biz --------------------------------------------------------------------------------