我需要在运行时添加 .drl 文件(从 S3 存储桶)并将其提供给流口水规则引擎

Question

无法在运行时通过 ResourceFactory.newURLResource（） 添加规则此外，知识库已被弃用或无法解析

我已经尝试了文档中的所有片段

公共类规则运行程序 {

public RuleRunner() {
}
public void runRules(String[] rules,
                     Object[] facts) throws Exception {
    KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
    KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
    for ( int i = 0; i < rules.length; i++ ) {
        String ruleFile = rules[i];
        System.out.println( "Loading file: " + ruleFile );
        kbuilder.add( ResourceFactory.newClassPathResource( ruleFile,
                                                            RuleRunner.class ),
                      ResourceType.DRL );
    }
    Collection<KnowledgePackage> pkgs = kbuilder.getKnowledgePackages();
    kbase.addKnowledgePackages( pkgs );
    StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
    for ( int i = 0; i < facts.length; i++ ) {
        Object fact = facts[i];
        System.out.println( "Inserting fact: " + fact );
        ksession.insert( fact );
    }
    ksession.fireAllRules();
}

}

public KieContainer getKieContainer（） {

    String drlURL ="https://s3.amazonaws.com/somebucket4/rules.drl";
    KieServices kieServices = KieServices.Factory.get();
    KieFileSystem kieFileSystem = kieServices.newKieFileSystem();
    kieFileSystem.write(ResourceFactory.newUrlResource(drlURL));
    KieBuilder kieBuilder = kieServices.newKieBuilder(kieFileSystem);
    kieBuilder.buildAll();
    KieModule kieModule = kieBuilder.getKieModule();
    return kieServices.newKieContainer(kieModule.getReleaseId());
}

Answer 1

在 Drools 中，现在一切都是面向罐子的。因此，您需要使用新创建的规则重建您的 KJar（它可以是仅写入内存文件系统的"虚拟 KJar"（KieModule）。要查看示例，请查看例如 Drools [1] 中的增量编译测试类。如果您搜索 Drools 代码库，您还可以找到其他带有示例的测试类。例如这个[2]。

[1] https://github.com/kiegroup/drools/blob/221cb15cde3ab5ea7388281d2c96158117ee3e19/drools-test-coverage/test-compiler-integration/src/test/java/org/drools/compiler/integrationtests/incrementalcompilation/IncrementalCompilationTest.java#L178
[2] https://github.com/kiegroup/drools/blob/a62949b27d35b423725da493bf53c252608438c7/drools-model/drools-model-compiler/src/test/java/org/drools/modelcompiler/IncrementalCompilationTest.java#L31