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使用Spring Boot部署Drools规则引擎

小樊
104
2024-08-29 13:14:53
栏目: 编程语言

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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