package de.codecentric.drools.configuration; import java.io.IOException; import org.kie.api.KieBase; import org.kie.api.KieServices; import org.kie.api.builder.KieBuilder; import org.kie.api.builder.KieFileSystem; import org.kie.api.builder.KieModule; import org.kie.api.builder.KieRepository; import org.kie.api.builder.ReleaseId; import org.kie.api.runtime.KieContainer; import org.kie.api.runtime.KieSession; import org.kie.internal.io.ResourceFactory; import org.kie.spring.KModuleBeanFactoryPostProcessor; import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.core.io.Resource; import org.springframework.core.io.support.PathMatchingResourcePatternResolver; import org.springframework.core.io.support.ResourcePatternResolver; @Configuration public class DroolsAutoConfiguration { private static final String RULES_PATH = "rules/"; @Bean @ConditionalOnMissingBean(KieFileSystem.class) public KieFileSystem kieFileSystem() throws IOException { KieFileSystem kieFileSystem = getKieServices().newKieFileSystem(); for (Resource file : getRuleFiles()) { kieFileSystem.write(ResourceFactory.newClassPathResource(RULES_PATH + file.getFilename(), "UTF-8")); } return kieFileSystem; } private Resource[] getRuleFiles() throws IOException { ResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver(); return resourcePatternResolver.getResources("classpath*:" + RULES_PATH + "**/*.*"); } @Bean @ConditionalOnMissingBean(KieContainer.class) public KieContainer kieContainer() throws IOException { final KieRepository kieRepository = getKieServices().getRepository(); kieRepository.addKieModule(new KieModule() { public ReleaseId getReleaseId() { return kieRepository.getDefaultReleaseId(); } }); KieBuilder kieBuilder = getKieServices().newKieBuilder(kieFileSystem()); kieBuilder.buildAll(); return getKieServices().newKieContainer(kieRepository.getDefaultReleaseId()); } private KieServices getKieServices() { return KieServices.Factory.get(); } @Bean @ConditionalOnMissingBean(KieBase.class) public KieBase kieBase() throws IOException { return kieContainer().getKieBase(); } @Bean @ConditionalOnMissingBean(KieSession.class) public KieSession kieSession() throws IOException { return kieContainer().newKieSession(); } /* * As http://docs.jboss.org/drools/release/6.2.0.CR1/drools-docs/html/ch.kie.spring.html * mentions: Without the org.kie.spring.KModuleBeanFactoryPostProcessor bean definition, * the kie-spring integration will not work */ @Bean @ConditionalOnMissingBean(KModuleBeanFactoryPostProcessor.class) public KModuleBeanFactoryPostProcessor kiePostProcessor() { return new KModuleBeanFactoryPostProcessor(); } }