本篇文章為大家展示了SpringBoot2中怎么整合Drools規(guī)則引擎，內(nèi)容簡(jiǎn)明扼要并且容易理解，絕對(duì)能使你眼前一亮，通過(guò)這篇文章的詳細(xì)介紹希望你能有所收獲。
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一、Drools引擎簡(jiǎn)介
1、基礎(chǔ)簡(jiǎn)介
Drools是一個(gè)基于java的規(guī)則引擎，開源的，可以將復(fù)雜多變的規(guī)則從硬編碼中解放出來(lái)，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(jī)器就可以立即在線上環(huán)境生效。具有易于訪問(wèn)企業(yè)策略、易于調(diào)整以及易于管理的特點(diǎn)，作為開源業(yè)務(wù)規(guī)則引擎，符合業(yè)內(nèi)標(biāo)準(zhǔn)，速度快、效率高。
2、規(guī)則語(yǔ)法
(1)、演示drl文件格式
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重慶分公司
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(yǔ)法說(shuō)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(gè)類，也可以是類中的可訪問(wèn)的靜態(tài)方法;
· rule
定義一個(gè)規(guī)則。paramcheck1規(guī)則名。規(guī)則通常包含三個(gè)部分：屬性、條件、結(jié)果;
二、整合SpringBoot框架
1、項(xiàng)目結(jié)構(gòu)
SpringBoot2 整合 Drools規(guī)則引擎，實(shí)現(xiàn)高效的業(yè)務(wù)規(guī)則
2、核心依賴
org.drools drools-core 7.6.0.Final org.drools drools-compiler 7.6.0.Final org.drools drools-templates 7.6.0.Final org.kie kie-api 7.6.0.Final org.kie kie-spring 7.6.0.Final
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(shuō)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(biāo)識(shí)是+號(hào)，執(zhí)行添加規(guī)則，-號(hào)，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() ;
}
}上述內(nèi)容就是SpringBoot2中怎么整合Drools規(guī)則引擎，你們學(xué)到知識(shí)或技能了嗎？如果還想學(xué)到更多技能或者豐富自己的知識(shí)儲(chǔ)備，歡迎關(guān)注創(chuàng)新互聯(lián)行業(yè)資訊頻道。
