使用Spring Boot部署Drools规则引擎

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作者
筋斗云
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要在Spring Boot中部署Drools规则引擎,你需要遵循以下步骤:

  1. 添加依赖

在你的pom.xml文件中,添加以下依赖:

    <!-- Spring Boot Starters -->    <dependency>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter</artifactId>     </dependency>      <!-- Drools Dependencies -->    <dependency>        <groupId>org.drools</groupId>        <artifactId>drools-core</artifactId>        <version>7.56.0.Final</version>     </dependency>    <dependency>        <groupId>org.drools</groupId>        <artifactId>drools-compiler</artifactId>        <version>7.56.0.Final</version>     </dependency>    <dependency>        <groupId>org.drools</groupId>        <artifactId>drools-decisiontables</artifactId>        <version>7.56.0.Final</version>     </dependency>    <dependency>        <groupId>org.kie</groupId>        <artifactId>kie-api</artifactId>        <version>7.56.0.Final</version>     </dependency>    <dependency>        <groupId>org.kie</groupId>        <artifactId>kie-internal</artifactId>        <version>7.56.0.Final</version>     </dependency> </dependencies> 
  1. 创建KieContainer

创建一个配置类,用于初始化KieContainer。这将允许你在应用程序中使用Drools规则引擎。

import org.kie.api.KieServices; import org.kie.api.builder.KieBuilder; import org.kie.api.builder.KieFileSystem; import org.kie.api.builder.KieRepository; import org.kie.api.runtime.KieContainer; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration;  @Configuration public class DroolsConfig {      @Bean     public KieContainer kieContainer() {         KieServices kieServices = KieServices.Factory.get();         KieRepository kieRepository = kieServices.getRepository();         KieFileSystem kieFileSystem = kieServices.newKieFileSystem();          // Load your DRL or DSL files here         // For example: kieFileSystem.write(ResourceFactory.newClassPathResource("rules/your-rule-file.drl"));          KieBuilder kieBuilder = kieServices.newKieBuilder(kieFileSystem);         kieBuilder.buildAll();          return kieServices.newKieContainer(kieRepository.getDefaultReleaseId());     } } 
  1. 编写规则文件

resources目录下创建一个名为rules的文件夹,并在其中创建你的DRL或DSL规则文件。例如,创建一个名为your-rule-file.drl的文件,并添加以下内容:

package com.example.drools  rule "Hello World Rule" when     // Your conditions here then     System.out.println("Hello World from Drools!"); end 
  1. 在配置类中加载规则文件

DroolsConfig类中,使用ResourceFactory加载你的规则文件。例如:

import org.kie.internal.io.ResourceFactory;  // ...  kieFileSystem.write(ResourceFactory.newClassPathResource("rules/your-rule-file.drl")); 
  1. 使用KieContainer

现在你可以在你的应用程序中使用KieContainer来执行规则。例如,创建一个名为DroolsService的服务类:

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 DroolsService {      @Autowired     private KieContainer kieContainer;      public void executeRules() {         KieSession kieSession = kieContainer.newKieSession();          // Insert your facts here         // For example: kieSession.insert(new YourFact());          kieSession.fireAllRules();         kieSession.dispose();     } } 
  1. 调用Drools服务

在你的控制器或其他需要执行规则的地方,注入DroolsService并调用executeRules()方法。

import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RestController;  @RestController public class MyController {      @Autowired     private DroolsService droolsService;      @GetMapping("/execute-rules")     public String executeRules() {         droolsService.executeRules();         return "Rules executed successfully!";     } } 

现在,当你访问/execute-rules端点时,Drools规则引擎将执行你的规则。

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