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drools

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马府强 2 years ago
parent
commit
82b1cf6d46
  1. 33
      drools/.gitignore
  2. 11
      drools/README.md
  3. 82
      drools/pom.xml
  4. 13
      drools/src/main/java/com/example/demo/DemoRequestScopeApplication.java
  5. 29
      drools/src/main/java/com/example/demo/config/DroolsConfig.java
  6. 35
      drools/src/main/java/com/example/demo/controller/OrderDiscountController.java
  7. 15
      drools/src/main/java/com/example/demo/request/CustomerType.java
  8. 15
      drools/src/main/java/com/example/demo/request/OrderDiscount.java
  9. 26
      drools/src/main/java/com/example/demo/request/OrderRequest.java
  10. 30
      drools/src/main/java/com/example/demo/service/OrderDiscountService.java
  11. 1
      drools/src/main/resources/application.properties
  12. 21
      drools/src/main/resources/application.yml
  13. 38
      drools/src/main/resources/rules/customer-discount.drl
  14. 172
      drools/src/test/java/com/example/demo/testscope/TestMain.java

33
drools/.gitignore

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HELP.md
target/
!.mvn/wrapper/maven-wrapper.jar
!**/src/main/**/target/
!**/src/test/**/target/
### STS ###
.apt_generated
.classpath
.factorypath
.project
.settings
.springBeans
.sts4-cache
### IntelliJ IDEA ###
.idea
*.iws
*.iml
*.ipr
### NetBeans ###
/nbproject/private/
/nbbuild/
/dist/
/nbdist/
/.nb-gradle/
build/
!**/src/main/**/build/
!**/src/test/**/build/
### VS Code ###
.vscode/

11
drools/README.md

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# demo-request-scope
《基于ThreadLocal实现一个上下文管理组件》技术博客对应源码
https://juejin.cn/post/7153287656624324638
本文基于`ThreadLocal`原理,实现了一个上下文状态管理组件`Scope`,通过开启一个自定义的`Scope`,在`Scope`范围内,可以通过`Scope`各个方法读写数据;
通过自定义线程池实现上下文状态数据的线程间传递;
提出了一种基于`Filter`和`Scope`的`Request`粒度的上下文管理方案。

82
drools/pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.7.4</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>demo-request-scope</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>demo-request-scope</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-core</artifactId>
<version>7.59.0.Final</version>
</dependency>
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-compiler</artifactId>
<version>7.59.0.Final</version>
</dependency>
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-decisiontables</artifactId>
<version>7.59.0.Final</version>
</dependency>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>30.1-jre</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-aop</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

13
drools/src/main/java/com/example/demo/DemoRequestScopeApplication.java

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package com.example.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class DemoRequestScopeApplication {
public static void main(String[] args) {
SpringApplication.run(DemoRequestScopeApplication.class, args);
}
}

29
drools/src/main/java/com/example/demo/config/DroolsConfig.java

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package com.example.demo.config;
import org.kie.api.KieServices;
import org.kie.api.builder.KieBuilder;
import org.kie.api.builder.KieFileSystem;
import org.kie.api.builder.KieModule;
import org.kie.api.runtime.KieContainer;
import org.kie.internal.io.ResourceFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class DroolsConfig {
// 制定规则文件的路径
private static final String RULES_CUSTOMER_RULES_DRL = "rules/customer-discount.drl";
private static final KieServices kieServices = KieServices.Factory.get();
@Bean
public KieContainer kieContainer() {
KieFileSystem kieFileSystem = kieServices.newKieFileSystem();
kieFileSystem.write(ResourceFactory.newClassPathResource(RULES_CUSTOMER_RULES_DRL));
KieBuilder kb = kieServices.newKieBuilder(kieFileSystem);
kb.buildAll();
KieModule kieModule = kb.getKieModule();
KieContainer kieContainer = kieServices.newKieContainer(kieModule.getReleaseId());
return kieContainer;
}
}

35
drools/src/main/java/com/example/demo/controller/OrderDiscountController.java

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package com.example.demo.controller;
import com.example.demo.request.OrderDiscount;
import com.example.demo.request.OrderRequest;
import com.example.demo.service.OrderDiscountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;
/**
* Spring Boot 整合 规则引擎Drools很强
* *网上购物
* * 需要根据不同的规则计算商品折扣
* * 比如VIP客户增加5%的折扣
* * 购买金额超过1000元的增加10%的折扣等
* * 而且这些规则可能随时发生变化
* * 甚至增加新的规则
* * 我们可以通过规则引擎来实现Drools 就是一个开源的业务规则引擎
*/
@RestController
public class OrderDiscountController {
@Autowired
private OrderDiscountService orderDiscountService;
@PostMapping("/get-discount")
public ResponseEntity<OrderDiscount> getDiscount(@RequestBody OrderRequest orderRequest) {
OrderDiscount discount = orderDiscountService.getDiscount(orderRequest);
return new ResponseEntity<>(discount, HttpStatus.OK);
}
}

15
drools/src/main/java/com/example/demo/request/CustomerType.java

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package com.example.demo.request;
/**
* @className: CustomerType
* @author: woniu
* @date: 2023/4/25
**/
public enum CustomerType {
LOYAL, NEW, DISSATISFIED;
public String getValue() {
return this.toString();
}
}

15
drools/src/main/java/com/example/demo/request/OrderDiscount.java

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package com.example.demo.request;
import lombok.Getter;
import lombok.Setter;
@Getter
@Setter
public class OrderDiscount {
/**
* 折扣
*/
private Integer discount = 0;
}

26
drools/src/main/java/com/example/demo/request/OrderRequest.java

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package com.example.demo.request;
import lombok.Getter;
import lombok.Setter;
@Getter
@Setter
public class OrderRequest {
/**
* 客户号
*/
private String customerNumber;
/**
* 年龄
*/
private Integer age;
/**
* 订单金额
*/
private Integer amount;
/**
* 客户类型
*/
private CustomerType customerType;
}

30
drools/src/main/java/com/example/demo/service/OrderDiscountService.java

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package com.example.demo.service;
import com.example.demo.request.OrderDiscount;
import com.example.demo.request.OrderRequest;
import org.kie.api.runtime.KieContainer;
import org.kie.api.runtime.KieSession;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class OrderDiscountService {
@Autowired
private KieContainer kieContainer;
public OrderDiscount getDiscount(OrderRequest orderRequest) {
OrderDiscount orderDiscount = new OrderDiscount();
// 开启会话
KieSession kieSession = kieContainer.newKieSession();
// 设置折扣对象
kieSession.setGlobal("orderDiscount", orderDiscount);
// 设置订单对象
kieSession.insert(orderRequest);
// 触发规则
kieSession.fireAllRules();
// 中止会话
kieSession.dispose();
return orderDiscount;
}
}

1
drools/src/main/resources/application.properties

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21
drools/src/main/resources/application.yml

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#spring:
# redis:
# database: 0
# # Redis服务器地址 写你的ip
# host: 192.168.56.10
# # Redis服务器连接端口
# port: 6379
# # Redis服务器连接密码(默认为空)
# password: 123456
# # 连接池最大连接数(使用负值表示没有限制 类似于mysql的连接池
# jedis:
# pool:
# max-active: 200
# # 连接池最大阻塞等待时间(使用负值表示没有限制) 表示连接池的链接拿完了 现在去申请需要等待的时间
# max-wait: -1
# # 连接池中的最大空闲连接
# max-idle: 10
# # 连接池中的最小空闲连接
# min-idle: 0
# # 连接超时时间(毫秒) 去链接redis服务端
# timeout: 6000

38
drools/src/main/resources/rules/customer-discount.drl

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package rules
import com.example.demo.request.OrderRequest;
import com.example.demo.request.CustomerType;
global com.example.demo.request.OrderDiscount orderDiscount;
dialect "mvel"
// 规则1: 根据年龄判断
rule "Age based discount"
when
// 当客户年龄在20岁以下或者50岁以上
OrderRequest(age < 20 || age > 50)
then
// 则添加10%的折扣
System.out.println("==========Adding 10% discount for Kids/ senior customer=============");
orderDiscount.setDiscount(orderDiscount.getDiscount() + 10);
end
// 规则2: 根据客户类型的规则
rule "Customer type based discount - Loyal customer"
when
// 当客户类型是LOYAL
OrderRequest(customerType.getValue == "LOYAL")
then
// 则增加5%的折扣
System.out.println("==========Adding 5% discount for LOYAL customer=============");
orderDiscount.setDiscount(orderDiscount.getDiscount() + 5);
end
rule "Customer type based discount - others"
when
OrderRequest(customerType.getValue != "LOYAL")
then
System.out.println("==========Adding 3% discount for NEW or DISSATISFIED customer=============");
orderDiscount.setDiscount(orderDiscount.getDiscount() + 3);
end

172
drools/src/test/java/com/example/demo/testscope/TestMain.java

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package com.example.demo.testscope;
import lombok.AllArgsConstructor;
import lombok.Data;
import org.junit.jupiter.api.Test;
import java.util.*;
import java.util.stream.Collectors;
import java.util.stream.Stream;
public class TestMain {
//工作中常用的一些Stream流操作,多年实践总结
/**
* 演示map的用途一对一转换
*/
@Test
public void stringToIntMap() {
List<String> ids = Arrays.asList("205", "105", "308", "469", "627", "193", "111");
// 使用流操作
List<User> results = ids.stream()
.map(id -> {
User user = new User(Integer.valueOf(id));
return user;
})
.collect(Collectors.toList());
System.out.println(results);
}
/**
* 演示map的用途一对多转换
*/
@Test
public void stringToIntFlatmap() {
List<String> sentences = Arrays.asList("hello world", "Jia Gou Wu Dao");
// 使用流操作
List<String> results = sentences.stream()
.flatMap(sentence -> Arrays.stream(sentence.split(" ")))
.collect(Collectors.toList());
System.out.println(results);
}
/**
*filtersorteddistinctlimit
*/
@Test
public void testGetTargetUsers() {
List<String> ids = Arrays.asList("205", "10", "308", "49", "627", "193", "111", "193");
// 使用流操作
List<User> results = ids.stream()
.filter(s -> s.length() > 2)
.distinct()
.map(Integer::valueOf)
.sorted(Comparator.comparingInt(o -> o))
.limit(3)
.map(id -> new User(id))
.collect(Collectors.toList());
System.out.println(results);
}
/**
* 简单结果终止方法
*/
@Test
public void testSimpleStopOptions() {
List<String> ids = Arrays.asList("205", "10", "308", "49", "627", "193", "111", "193");
// 统计stream操作后剩余的元素个数
System.out.println(ids.stream().filter(s -> s.length() > 2).count());
// 判断是否有元素值等于205
System.out.println(ids.stream().filter(s -> s.length() > 2).anyMatch("205"::equals));
// findFirst操作
ids.stream().filter(s -> s.length() > 2)
.findFirst()
.ifPresent(s -> System.out.println("findFirst:" + s));
}
/**
* 一旦一个Stream被执行了终止操作之后后续便不可以再读这个流执行其他的操作了否则会报错
*/
@Test
public void testHandleStreamAfterClosed() {
List<String> ids = Arrays.asList("205", "10", "308", "49", "627", "193", "111", "193");
Stream<String> stream = ids.stream().filter(s -> s.length() > 2);
// 统计stream操作后剩余的元素个数
System.out.println(stream.count());
System.out.println("-----下面会报错-----");
// 判断是否有元素值等于205
try {
System.out.println(stream.anyMatch("205"::equals));
} catch (Exception e) {
e.printStackTrace();
}
System.out.println("-----上面会报错-----");
}
/**
* 生成集合
*/
@Test
public void testCollectStopOptions() {
List<User> ids = Arrays.asList(new User(17), new User(22), new User(23));
// collect成list
List<User> collectList = ids.stream().filter(dept -> dept.getId() > 20)
.collect(Collectors.toList());
System.out.println("collectList:" + collectList);
// collect成Set
Set<User> collectSet = ids.stream().filter(dept -> dept.getId() > 20)
.collect(Collectors.toSet());
System.out.println("collectSet:" + collectSet);
// collect成HashMap,key为id,value为Dept对象
Map<Integer, User> collectMap = ids.stream().filter(dept -> dept.getId() > 20)
.collect(Collectors.toMap(com.example.demo.testscope.User::getId, dept -> dept));
System.out.println("collectMap:" + collectMap);
}
/**
* 生成拼接字符串
*/
@Test
public void testCollectJoinStrings() {
List<String> ids = Arrays.asList("205", "10", "308", "49", "627", "193", "111", "193");
String joinResult = ids.stream().collect(Collectors.joining(","));
System.out.println("拼接后:" + joinResult);
}
/**
* 数学运算
*/
@Test
public void testNumberCalculate() {
List<Integer> ids = Arrays.asList(10, 20, 30, 40, 50);
// 计算平均值
Double average = ids.stream().collect(Collectors.averagingInt(value -> value));
System.out.println("平均值:" + average);
// 数据统计信息
IntSummaryStatistics summary = ids.stream().collect(Collectors.summarizingInt(value -> value));
System.out.println("数据统计信息: " + summary);
}
}
@Data
@AllArgsConstructor
class User {
private int id;
}
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