Java Drools 6.0 在运行时动态加载规则
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Drools 6.0 dynamically load rules at runtime
提问by Aidan
回答by Steve
In Drools 6, your rules packages are deployed to Maven. A KieScanner is provided, which you can attach to your KieContainer. This polls your repository at a defined interval to see whether a package has been updated and downloads the latest if that's the case.
在 Drools 6 中，您的规则包被部署到 Maven。提供了一个 KieScanner，您可以将其附加到您的 KieContainer。这会以定义的时间间隔轮询您的存储库，以查看软件包是否已更新，如果是，则下载最新的。
A full explanation of how to define a KieScanner (including code samples) is provided in the Drools documentation here:
Drools 文档中提供了如何定义 KieScanner（包括代码示例）的完整说明：
https://docs.jboss.org/drools/release/latest/drools-docs/html/ch04.html
https://docs.jboss.org/drools/release/latest/drools-docs/html/ch04.html
回答by danidemi
I used info taken from those two docs:
我使用了从这两个文档中获取的信息：
- https://docs.jboss.org/drools/release/6.0.1.Final/drools-docs/html_single/#d0e109
- https://github.com/droolsjbpm/drools/blob/master/drools-compiler/src/test/java/org/drools/compiler/CommonTestMethodBase.java
- https://docs.jboss.org/drools/release/6.0.1.Final/drools-docs/html_single/#d0e109
- https://github.com/droolsjbpm/drools/blob/master/drools-compiler/src/test/java/org/drools/compiler/CommonTestMethodBase.java
I've came out with this snippet that loads rules defined in the /drl/file/pathfile into the stateful session you obtain at the last line.
我提出了这个片段，它将/drl/file/path文件中定义的规则加载到您在最后一行获得的有状态会话中。
File path = new File("/drl/file/path");
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add(ResourceFactory.newFileResource(path), ResourceType.DRL);
if (kbuilder.hasErrors()) {
throw new RuntimeException("Errors: " + kbuilder.getErrors());
}
kbase = KnowledgeBaseFactory.newKnowledgeBase();
kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
Some methods are deprecated, so, don't expect this solution to be valid in the following releases.
不推荐使用某些方法，因此，不要指望此解决方案在以下版本中有效。
Please, double check the imports, they are all from org.kie, not from droolspackages. I admit those imports are too much, but I'm pasting the code from an example I'm trying to develop, so I have more things on my code, sorry for that.
请仔细检查导入，它们都来自org.kie，而不是来自drools包。我承认这些导入太多了，但是我正在粘贴我正在尝试开发的示例中的代码，所以我的代码中有更多内容，抱歉。
import java.io.File;
导入 java.io.File;
import org.kie.api.KieServices;
import org.kie.api.builder.KieBuilder;
import org.kie.api.builder.KieFileSystem;
import org.kie.api.builder.KieScanner;
import org.kie.api.builder.ReleaseId;
import org.kie.api.builder.model.KieBaseModel;
import org.kie.api.builder.model.KieModuleModel;
import org.kie.api.builder.model.KieSessionModel;
import org.kie.api.conf.EqualityBehaviorOption;
import org.kie.api.conf.EventProcessingOption;
import org.kie.api.io.Resource;
import org.kie.api.io.ResourceType;
import org.kie.api.runtime.KieContainer;
import org.kie.api.runtime.conf.ClockTypeOption;
import org.kie.internal.KnowledgeBase;
import org.kie.internal.KnowledgeBaseFactory;
import org.kie.internal.builder.KnowledgeBuilder;
import org.kie.internal.builder.KnowledgeBuilderFactory;
import org.kie.internal.io.ResourceFactory;
import org.kie.internal.runtime.StatefulKnowledgeSession;
Hope it helps.
希望能帮助到你。
回答by Claude
You have a how-to of what you're looking for in Drools 6: http://oncodesign.io/2015/08/10/dynamically-create-rules-using-drools--rule-templates/
你有你在 Drools 6 中寻找什么的操作方法：http: //oncodesign.io/2015/08/10/dynamically-create-rules-using-drools--rule-templates/
