Drools 5 work with Gunvor-优快云博客

本文链接：https://blog.youkuaiyun.com/jimchenchen/article/details/83469712

本文介绍了一次从 Drools 4.0.7 迁移到 Drools 5.0 Guvnor 的实战经历，解决了原有 brms 使用中遇到的问题，并详细记录了配置及 Java 类实现过程。

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之前使用Drools 4.0.7 知道brms ，发现brms不怎么好用！

昨天被问到Drools 5 的怎么用，关于gunvor的，一直都报错！

狠下心来，不要了原先的 jboss-4.2.3.GA 重新下载了个：drools-5.0-guvnor-standalone.zip

修改：

chen.properties

newInstance=true
#dir=src/main/rules
#url=http://localhost:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/com.chen.rules/LATEST

url=http\://localhost\:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/mortgages/LATEST
#url

java类：

package com.sample;

import org.drools.KnowledgeBase;
import org.drools.KnowledgeBaseFactory;
import org.drools.RuleBase;
import org.drools.StatefulSession;
import org.drools.agent.RuleAgent;
import org.drools.builder.KnowledgeBuilder;
import org.drools.builder.KnowledgeBuilderError;
import org.drools.builder.KnowledgeBuilderErrors;
import org.drools.builder.KnowledgeBuilderFactory;
import org.drools.builder.ResourceType;
import org.drools.io.ResourceFactory;
import org.drools.logger.KnowledgeRuntimeLogger;
import org.drools.logger.KnowledgeRuntimeLoggerFactory;
import org.drools.runtime.StatefulKnowledgeSession;

/**
* This is a sample class to launch a rule.
*/
public class DroolsTest {

public static final void main(String[] args) {
  try {
   // load up the knowledge base
   //KnowledgeBase kbase = readKnowledgeBase();
   RuleBase base=readKnowledgeBase();
   StatefulSession ksession = base.newStatefulSession();

   // go !
   Message message = new Message();
   message.setMessage("Hello World");
   message.setStatus(Message.HELLO);
   ksession.insert(message);
   ksession.fireAllRules();

  } catch (Throwable t) {
   t.printStackTrace();
  }
}

private static RuleBase readKnowledgeBase() throws Exception {
/*  KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
  kbuilder.add(ResourceFactory.newClassPathResource("Sample.drl"), ResourceType.DRL);
  KnowledgeBuilderErrors errors = kbuilder.getErrors();
  if (errors.size() > 0) {
   for (KnowledgeBuilderError error: errors) {
    System.err.println(error);
   }
   throw new IllegalArgumentException("Could not parse knowledge.");
  }
  KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
  kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());*/

  //新写的代码
  RuleAgent agent=RuleAgent.newRuleAgent("/chen.properties");
  RuleBase kbase=agent.getRuleBase();


  return kbase;
}

public static class Message {

  public static final int HELLO = 0;
  public static final int GOODBYE = 1;

private String message;

private int status;

  public String getMessage() {
   return this.message;
  }

  public void setMessage(String message) {
   this.message = message;
  }

  public int getStatus() {
   return this.status;
  }

  public void setStatus(int status) {
   this.status = status;
  }

}

}

Gunvor视图：

结构：

结果输出：

RuleAgent(default) INFO (Thu Oct 15 01:27:56 CST 2009): Configuring with newInstance=true, secondsToRefresh=-1
RuleAgent(default) INFO (Thu Oct 15 01:27:56 CST 2009): Configuring package provider : URLScanner monitoring URLs: http://localhost:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/mortgages/LATEST
RuleAgent(default) INFO (Thu Oct 15 01:28:05 CST 2009): Applying changes to the rulebase.
RuleAgent(default) INFO (Thu Oct 15 01:28:05 CST 2009): Creating a new rulebase as per settings.
RuleAgent(default) INFO (Thu Oct 15 01:28:05 CST 2009): Adding package called mortgages

Yes！

夜深了，烦闷地沉睡...

有一天我会长大