org.drools.examples.FibonacciExample Maven / Gradle / Ivy

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package org.drools.examples;

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.io.ResourceFactory;
import org.drools.logger.KnowledgeRuntimeLogger;
import org.drools.logger.KnowledgeRuntimeLoggerFactory;
import org.drools.runtime.StatefulKnowledgeSession;

public class FibonacciExample {

    public static void main(final String[] args) throws Exception {

        final KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
        kbuilder.add( ResourceFactory.newClassPathResource( "Fibonacci.drl",
                                                                    FibonacciExample.class ),
                              ResourceType.DRL );

        final KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
        kbase.addKnowledgePackages( kbuilder.getKnowledgePackages() );

        final StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();

        KnowledgeRuntimeLogger logger = KnowledgeRuntimeLoggerFactory.newFileLogger(ksession, "log/fibonacci");

        ksession.insert( new Fibonacci( 10 ) );

        ksession.fireAllRules();

		logger.close();

        ksession.dispose(); // Stateful rule session must always be disposed when finished

    }

    public static class Fibonacci {
        private int  sequence;

        private long value;

        public Fibonacci() {

        }

        public Fibonacci(final int sequence) {
            this.sequence = sequence;
            this.value = -1;
        }

        public int getSequence() {
            return this.sequence;
        }

        public void setValue(final long value) {
            this.value = value;
        }

        public long getValue() {
            return this.value;
        }

        public String toString() {
            return "Fibonacci(" + this.sequence + "/" + this.value + ")";
        }
    }

}