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    • org.drools.examples.HelloWorldExample Maven / Gradle / Ivy

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    package org.drools.examples;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

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.event.rule.DebugAgendaEventListener;
import org.drools.event.rule.DebugWorkingMemoryEventListener;
import org.drools.io.ResourceFactory;
import org.drools.logger.KnowledgeRuntimeLogger;
import org.drools.logger.KnowledgeRuntimeLoggerFactory;
import org.drools.runtime.StatefulKnowledgeSession;

/**
 * This is a sample file to launch a rule package from a rule source file.
 */
public class HelloWorldExample {

	public static final void main(final String[] args) throws Exception {
		final KnowledgeBuilder kbuilder = KnowledgeBuilderFactory
				.newKnowledgeBuilder();

		// this will parse and compile in one step
		kbuilder.add(ResourceFactory.newClassPathResource("HelloWorld.drl",
				HelloWorldExample.class), ResourceType.DRL);

		// Check the builder for errors
		if (kbuilder.hasErrors()) {
			System.out.println(kbuilder.getErrors().toString());
			throw new RuntimeException("Unable to compile \"HelloWorld.drl\".");
		}

		// get the compiled packages (which are serializable)
		final Collection pkgs = kbuilder
				.getKnowledgePackages();

		// add the packages to a knowledgebase (deploy the knowledge packages).
		final KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
		kbase.addKnowledgePackages(pkgs);

		final StatefulKnowledgeSession ksession = kbase
				.newStatefulKnowledgeSession();
		ksession.setGlobal("list", new ArrayList());

		ksession.addEventListener(new DebugAgendaEventListener());
		ksession.addEventListener(new DebugWorkingMemoryEventListener());

		// setup the audit logging
		KnowledgeRuntimeLogger logger = KnowledgeRuntimeLoggerFactory
				.newFileLogger(ksession, "log/helloworld");

		final Message message = new Message();
		message.setMessage("Hello World");
		message.setStatus(Message.HELLO);
		ksession.insert(message);

		ksession.fireAllRules();

		logger.close();

		ksession.dispose();
	}

	public static class Message {
		public static final int HELLO = 0;
		public static final int GOODBYE = 1;

		private String message;

		private int status;

		public Message() {

		}

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

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

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

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

		public static Message doSomething(Message message) {
			return message;
		}

		public boolean isSomething(String msg, List list) {
			list.add(this);
			return this.message.equals(msg);
		}
	}

}
    
    
    
    

    




    
    
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