DDDlib对规则引擎Drools的封装代码,Java代码库,德仔网

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【Java】 DDDlib对规则引擎Drools的封装

作者:大雅堂zacker / 发布于2013/3/18/ 659

企业应用的三大核心技术：流程引擎技术、规则引擎技术、复杂事件处理。


	package com.dayatang.rule;

	import static org.junit.Assert.*;

	import java.util.Arrays;
	import java.util.Collection;

	import org.drools.KnowledgeBase;
	import org.drools.KnowledgeBaseFactory;
	import org.drools.builder.KnowledgeBuilder;
	import org.drools.builder.KnowledgeBuilderFactory;
	import org.drools.builder.ResourceType;
	import org.drools.definition.KnowledgePackage;
	import org.drools.io.ResourceFactory;
	import org.drools.runtime.StatefulKnowledgeSession;
	import org.drools.runtime.StatelessKnowledgeSession;
	import org.junit.Before;
	import org.junit.Test;

	import com.dayatang.rule.examples.Person;

	public class DroolsTest {

	private String ruleDrl = "/Person.drl";
	private Person chencao;
	private Person xishi;
	private Person yyang;

	@Before
	public void setUp() {
	 chencao = new Person(1L, "chencao", "male");
	 xishi = new Person(2L, "xishi", "female");
	 yyang = new Person(3L, "yyang", "male");
	}

	@Test
	public void stateless() throws Exception {
	 // Execute rule
	 StatelessKnowledgeSession session = createStatelessKnowledgeSession();
	 session.execute(Arrays.asList(chencao, xishi, yyang));

	 // Validate
	 assertEquals(60, chencao.getRetireAge());
	 assertEquals(55, xishi.getRetireAge());
	 assertEquals(60, yyang.getRetireAge());

	 // Release the resources
	}

	private StatelessKnowledgeSession createStatelessKnowledgeSession() {
	 return createknowledgeBase().newStatelessKnowledgeSession();
	}

	@Test
	public void stateful() throws Exception {
	 // Execute rule
	 StatefulKnowledgeSession session = createStatefulKnowledgeSession();
	 session.insert(chencao);
	 session.insert(xishi);
	 session.insert(yyang);
	 session.fireAllRules();

	 // Validate
	 assertEquals(60, chencao.getRetireAge());
	 assertEquals(55, xishi.getRetireAge());
	 assertEquals(60, yyang.getRetireAge());

	 // Release the resources
	 session.dispose();
	}

	private StatefulKnowledgeSession createStatefulKnowledgeSession() {
	 return createknowledgeBase().newStatefulKnowledgeSession();
	}

	private KnowledgeBase createknowledgeBase() {
	 KnowledgeBase knowledgeBase = KnowledgeBaseFactory.newKnowledgeBase();
	 Collection<KnowledgePackage> knowledgePackages = createKnowledgeBuilder().getKnowledgePackages();
	 knowledgeBase.addKnowledgePackages(knowledgePackages);
	 return knowledgeBase;
	}

	private KnowledgeBuilder createKnowledgeBuilder() {
	 KnowledgeBuilder knowledgeBuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
	 knowledgeBuilder.add(ResourceFactory.newClassPathResource(ruleDrl, getClass()), ResourceType.DRL);
	 if (knowledgeBuilder.hasErrors()) {
	 System.err.println(knowledgeBuilder.getErrors().toString());
	 }
	 return knowledgeBuilder;
	}
	}

	

	

	

	package org.drools.examples
	
	import com.dayatang.rule.examples.Person
	import com.dayatang.rule.examples.Helper
	global java.util.List list


	rule "male"
	 dialect "mvel"
	when
	 $p : Person( gender == "male" )
	then
	 System.out.println("rule 'male' is running...")
	 $p.retireAge = 60
	end

	rule "female"
	 dialect "mvel"
	when
	 $p : Person( gender == "female" )
	then
	 System.out.println("rule 'female' is running...")
	 $p.retireAge = 55
	end

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