通过将业务规则配置的配置文件中,可以精简代码,同时已于维护,当规则修改时,只需要修改配置文件即可。easy-rules是一个小巧的规则引擎,支持spring的spel表达式,同时还支持 apache jexl 表达式和 mvl 表达式。
在项目的gradle中增加依赖关系。
build.gradle:
plugins { id 'org.springframework.boot' version '3.0.5' id 'io.spring.dependency-management' version '1.1.0' id 'java'}group = 'cn.springcamp'version = '0.0.1-SNAPSHOT'sourceCompatibility = '17'configurations { compileOnly { extendsFrom annotationProcessor } testCompileOnly { extendsFrom testAnnotationProcessor }}repositories { mavenCentral()}dependencies { implementation "org.springframework.boot:spring-boot-starter-json" implementation 'org.springframework.boot:spring-boot-starter-validation' implementation 'org.jeasy:easy-rules-core:4.1.0' implementation 'org.jeasy:easy-rules-spel:4.1.0' implementation 'org.jeasy:easy-rules-support:4.1.0' annotationProcessor 'org.projectlombok:lombok' testAnnotationProcessor 'org.projectlombok:lombok' testImplementation "org.springframework.boot:spring-boot-starter-test" testImplementation 'org.junit.vintage:junit-vintage-engine' testImplementation 'org.junit.vintage:junit-vintage-engine'}dependencyManagement { imports { mavenBom "org.springframework.cloud:spring-cloud-dependencies:2022.0.1" }}test { useJUnitPlatform()}
示例程序将业务规则放到配置文件中,业务规则配置文件(demo-rule.yml)代码:
name: "age rule"
description: ""
priority: 1
condition: "#person.getAdult() == false"
actions:
- "T(java.lang.System).out.println(\"Shop: Sorry, you are not allowed to buy alcohol\")"
- "#person.setAdult(true)"
- "#person.setAge(18)"
---
name: "alcohol rule"
description: ""
priority: 1
condition: "#person.getAdult() == true"
actions:
- "T(java.lang.System).out.println(\"Shop: you are now allowed to buy alcohol\")"
配置文件中的规则通过 condition 进行配置,当满足规则时,会调用 actions 中配置的动作。
示例项目使用了spring的SPEL表达式进行规则配置,配置文件中配置了2个规则,第一个规则通过 person这个spring bean中的getAdult()判断是否满足规则,满足规则时调用三个方法。
在spring-boot本身的配置文件中 application.yml 配置规则文件:
rule:
skip-on-first-failed-rule: true
skip-on-first-applied-rule: false
skip-on-first-non-triggered-rule: true
rules:
- rule-id: "demo"
rule-file-location: "classpath:demo-rule.yml"
通过 RuleEngineConfig这个spring的配置类对规则引擎进行配置:
@Slf4j @EnableConfigurationProperties(RuleEngineConfigProperties.class) @Configuration public class RuleEngineConfig implements BeanFactoryAware { @Autowired(required = false) private List<RuleListener> ruleListeners; @Autowired(required = false) private List<RulesEngineListener> rulesEngineListeners; private BeanFactory beanFactory; @Bean public RulesEngineParameters rulesEngineParameters(RuleEngineConfigProperties properties) { RulesEngineParameters parameters = new RulesEngineParameters(); parameters.setSkipOnFirstAppliedRule(properties.isSkipOnFirstAppliedRule()); parameters.setSkipOnFirstFailedRule(properties.isSkipOnFirstFailedRule()); parameters.setSkipOnFirstNonTriggeredRule(properties.isSkipOnFirstNonTriggeredRule()); return parameters; } @Bean public RulesEngine rulesEngine(RulesEngineParameters rulesEngineParameters) { DefaultRulesEngine rulesEngine = new DefaultRulesEngine(rulesEngineParameters); if (!CollectionUtils.isEmpty(ruleListeners)) { rulesEngine.registerRuleListeners(ruleListeners); } if (!CollectionUtils.isEmpty(rulesEngineListeners)) { rulesEngine.registerRulesEngineListeners(rulesEngineListeners); } return rulesEngine; } @Bean public BeanResolver beanResolver() { return new BeanFactoryResolver(beanFactory); } @Bean public RuleEngineTemplate ruleEngineTemplate(RuleEngineConfigProperties properties, RulesEngine rulesEngine) { RuleEngineTemplate ruleEngineTemplate = new RuleEngineTemplate(); ruleEngineTemplate.setBeanResolver(beanResolver()); ruleEngineTemplate.setProperties(properties); ruleEngineTemplate.setRulesEngine(rulesEngine); return ruleEngineTemplate; } @Bean public RuleListener defaultRuleListener() { return new RuleListener() { @Override public boolean beforeEvaluate(Rule rule, Facts facts) { return true; } @Override public void afterEvaluate(Rule rule, Facts facts, boolean b) { log.info("-----------------afterEvaluate-----------------"); log.info(rule.getName() + rule.getDescription() + facts.toString()); } @Override public void beforeExecute(Rule rule, Facts facts) { log.info("-----------------beforeExecute-----------------"); log.info(rule.getName() + rule.getDescription() + facts.toString()); } @Override public void onSuccess(Rule rule, Facts facts) { log.info("-----------------onSuccess-----------------"); log.info(rule.getName() + rule.getDescription() + facts.toString()); } @Override public void onFailure(Rule rule, Facts facts, Exception e) { log.info("-----------------onFailure-----------------"); log.info(rule.getName() + "----------" + rule.getDescription() + facts.toString() + e.toString()); } }; } @Override public void setBeanFactory(BeanFactory beanFactory) throws BeansException { this.beanFactory = beanFactory; } }
配置文件中配置了 ruleEngineTemplate这个spring bean,通过ruleEngineTemplate触发规则引擎的执行。
ruleEngineTemplate配置好后,我们可以在业务代码中执行规则引擎,处理配置文件中配置的业务规则:
最为演示,我们将规则引擎的执行代码放到了 Application 的 run 方法中,程序启动后立即执行规则引擎:
@SpringBootApplication public class Application implements CommandLineRunner { @Autowired RuleEngineTemplate ruleEngineTemplate; public static void main(String[] args) { SpringApplication.run(Application.class, args); } @Override public void run(String... args) { Person person = new Person(); Facts facts = new Facts(); facts.put("person", person); ruleEngineTemplate.fire("demo", facts); } }
程序执行后可以看到控制台里打印了 Shop: Sorry, you are not allowed to buy alcohol,这个内容对应的是我们在规则文件中的actions中配置的 "T(java.lang.System).out.println(\"Shop: Sorry, you are not allowed to buy alcohol\")",说明规则成功执行了。
以上就是SpringBoot集成easy-rules规则引擎的流程是什么的详细内容,更多请关注php中文网其它相关文章!
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