SpringBoot2整合Drools規(guī)則引擎及案例詳解

更新時間：2019年10月23日 08:31:28 作者：知了一笑

這篇文章主要介紹了SpringBoot2整合Drools規(guī)則引擎及案例詳解,文中通過示例代碼介紹的非常詳細，對大家的學習或者工作具有一定的參考學習價值,需要的朋友可以參考下

一、Drools引擎簡介

1、基礎簡介

Drools是一個基于java的規(guī)則引擎，開源的，可以將復雜多變的規(guī)則從硬編碼中解放出來，以規(guī)則腳本的形式存放在文件中，使得規(guī)則的變更不需要修正代碼重啟機器就可以立即在線上環(huán)境生效。具有易于訪問企業(yè)策略、易于調(diào)整以及易于管理的特點，作為開源業(yè)務規(guī)則引擎，符合業(yè)內(nèi)標準，速度快、效率高。

2、規(guī)則語法

(1)、演示drl文件格式

package droolRule ;
import org.slf4j.Logger
import org.slf4j.LoggerFactory ;
dialect "java"
rule "paramcheck1"
  when 
  then
    final Logger LOGGER = LoggerFactory.getLogger("param-check-one 規(guī)則引擎") ;
    LOGGER.info("參數(shù)");
end

(2)、語法說明

· 文件格式

可以 .drl、xml文件，也可以Java代碼塊硬編碼;

· package

規(guī)則文件中，package是必須定義的，必須放在規(guī)則文件第一行;

· import

規(guī)則文件使用到的外部變量，可以是一個類，也可以是類中的可訪問的靜態(tài)方法;

· rule

定義一個規(guī)則。paramcheck1規(guī)則名。規(guī)則通常包含三個部分：屬性、條件、結(jié)果;

二、整合SpringBoot框架

1、項目結(jié)構(gòu)

SpringBoot2 整合 Drools規(guī)則引擎，實現(xiàn)高效的業(yè)務規(guī)則

2、核心依賴

<!--drools規(guī)則引擎-->
<dependency>
  <groupId>org.drools</groupId>
  <artifactId>drools-core</artifactId>
  <version>7.6.0.Final</version>
</dependency>
<dependency>
  <groupId>org.drools</groupId>
  <artifactId>drools-compiler</artifactId>
  <version>7.6.0.Final</version>
</dependency>
<dependency>
  <groupId>org.drools</groupId>
  <artifactId>drools-templates</artifactId>
  <version>7.6.0.Final</version>
</dependency>
<dependency>
  <groupId>org.kie</groupId>
  <artifactId>kie-api</artifactId>
  <version>7.6.0.Final</version>
</dependency>
<dependency>
  <groupId>org.kie</groupId>
  <artifactId>kie-spring</artifactId>
  <version>7.6.0.Final</version>
</dependency>

3、配置文件

@Configuration
public class RuleEngineConfig {
  private static final Logger LOGGER = LoggerFactory.getLogger(RuleEngineConfig.class) ;
  private static final String RULES_PATH = "droolRule/";
  private final KieServices kieServices = KieServices.Factory.get();
  @Bean
  public KieFileSystem kieFileSystem() throws IOException {
    KieFileSystem kieFileSystem = kieServices.newKieFileSystem();
    ResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver();
    Resource[] files = resourcePatternResolver.getResources("classpath*:" + RULES_PATH + "*.*");
    String path = null;
    for (Resource file : files) {
      path = RULES_PATH + file.getFilename();
      LOGGER.info("path="+path);
      kieFileSystem.write(ResourceFactory.newClassPathResource(path, "UTF-8"));
    }
    return kieFileSystem;
  }
  @Bean
  public KieContainer kieContainer() throws IOException {
    KieRepository kieRepository = kieServices.getRepository();
    kieRepository.addKieModule(kieRepository::getDefaultReleaseId);
    KieBuilder kieBuilder = kieServices.newKieBuilder(kieFileSystem());
    kieBuilder.buildAll();
    return kieServices.newKieContainer(kieRepository.getDefaultReleaseId());
  }
  @Bean
  public KieBase kieBase() throws IOException {
    return kieContainer().getKieBase();
  }
  @Bean
  public KieSession kieSession() throws IOException {
    return kieContainer().newKieSession();
  }
  @Bean
  public KModuleBeanFactoryPostProcessor kiePostProcessor() {
    return new KModuleBeanFactoryPostProcessor();
  }
}

這樣環(huán)境整合就完成了。

三、演示案例

1、規(guī)則文件

規(guī)則一

dialect "java"
rule "paramcheck1"
salience 99
when queryParam : QueryParam(paramId != null && paramSign.equals("+"))
  resultParam : RuleResult()
then
  final Logger LOGGER = LoggerFactory.getLogger("param-check-one 規(guī)則引擎") ;
  LOGGER.info("參數(shù):getParamId="+queryParam.getParamId()+";getParamSign="+queryParam.getParamSign());
  RuleEngineServiceImpl ruleEngineService = new RuleEngineServiceImpl() ;
  ruleEngineService.executeAddRule(queryParam);
  resultParam.setPostCodeResult(true);
end

規(guī)則二

dialect "java"
rule "paramcheck2"
salience 88
when queryParam : QueryParam(paramId != null && paramSign.equals("-"))
  resultParam : RuleResult()
then
  final Logger LOGGER = LoggerFactory.getLogger("param-check-two 規(guī)則引擎") ;
  LOGGER.info("參數(shù):getParamId="+queryParam.getParamId()+";getParamSign="+queryParam.getParamSign());
  RuleEngineServiceImpl ruleEngineService = new RuleEngineServiceImpl() ;
  ruleEngineService.executeRemoveRule(queryParam);
  resultParam.setPostCodeResult(true);
end

規(guī)則說明：

A、salience 的值越大，越優(yōu)先執(zhí)行；

B、規(guī)則流程：如果paramId不為null，參數(shù)標識是+號，執(zhí)行添加規(guī)則，-號，執(zhí)行移除規(guī)則操作。

2、規(guī)則執(zhí)行代碼

@Service
public class RuleEngineServiceImpl implements RuleEngineService {
  private static final Logger LOGGER = LoggerFactory.getLogger(RuleEngineServiceImpl.class) ;
  @Override
  public void executeAddRule(QueryParam param) {
    LOGGER.info("參數(shù)數(shù)據(jù):"+param.getParamId()+";"+param.getParamSign());
    ParamInfo paramInfo = new ParamInfo() ;
    paramInfo.setId(param.getParamId());
    paramInfo.setParamSign(param.getParamSign());
    paramInfo.setCreateTime(new Date());
    paramInfo.setUpdateTime(new Date());
    ParamInfoService paramInfoService = (ParamInfoService)SpringContextUtil.getBean("paramInfoService") ;
    paramInfoService.insertParam(paramInfo);
  }
  @Override
  public void executeRemoveRule(QueryParam param) {
    LOGGER.info("參數(shù)數(shù)據(jù):"+param.getParamId()+";"+param.getParamSign());
    ParamInfoService paramInfoService = (ParamInfoService)SpringContextUtil.getBean("paramInfoService") ;
    ParamInfo paramInfo = paramInfoService.selectById(param.getParamId());
    if (paramInfo != null){
      paramInfoService.removeById(param.getParamId()) ;
    }
  }
}

3、規(guī)則調(diào)用接口

@RestController
@RequestMapping("/rule")
public class RuleController {
  @Resource
  private KieSession kieSession;
  @Resource
  private RuleEngineService ruleEngineService ;
  @RequestMapping("/param")
  public void param (){
    QueryParam queryParam1 = new QueryParam() ;
    queryParam1.setParamId("1");
    queryParam1.setParamSign("+");
    QueryParam queryParam2 = new QueryParam() ;
    queryParam2.setParamId("2");
    queryParam2.setParamSign("-");
    // 入?yún)?
    kieSession.insert(queryParam1) ;
    kieSession.insert(queryParam2) ;
    kieSession.insert(this.ruleEngineService) ;
    // 返參
    RuleResult resultParam = new RuleResult() ;
    kieSession.insert(resultParam) ;
    kieSession.fireAllRules() ;
  }
}

這樣，完整的案例就結(jié)束了。

四、源代碼地址

GitHub·地址

https://github.com/cicadasmile/middle-ware-parent

GitEE·地址

https://gitee.com/cicadasmile/middle-ware-parent

以上就是本文的全部內(nèi)容，希望對大家的學習有所幫助，也希望大家多多支持腳本之家。

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