SimpleRuleActivator.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.servicemix.examples.drools.simple.osgi;

import static org.apache.servicemix.examples.drools.simple.osgi.Utils.customerPoor;
import static org.apache.servicemix.examples.drools.simple.osgi.Utils.customerNormal;
import static org.apache.servicemix.examples.drools.simple.osgi.Utils.customerVip;

import org.apache.servicemix.examples.drools.simple.model.Customer;
import org.kie.api.KieBase;
import org.kie.api.KieServices;
import org.kie.api.event.rule.DebugAgendaEventListener;
import org.kie.api.event.rule.DebugRuleRuntimeEventListener;
import org.kie.api.runtime.KieContainer;
import org.kie.api.runtime.KieSession;
import org.kie.api.runtime.rule.FactHandle;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class SimpleRuleActivator implements BundleActivator {
    /**
     * LOGGER.
     */
    private static final Logger logger = LoggerFactory
            .getLogger(SimpleRuleActivator.class);

    /**
     * KieSession.
     */
    private KieSession ksession;


    @Override
    public void start(BundleContext context) throws Exception {
        KieServices ks = KieServices.Factory.get();
        KieContainer kcont = ks.newKieClasspathContainer(getClass()
                .getClassLoader());
        KieBase kbase = kcont.getKieBase("SimpleRuleKBase");

        logger.info("KieSession newKieSession.");
        ksession = kbase.newKieSession();

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

        Customer customer = customerPoor();

        logger.info("KieSession fireAllRules. {}", customer);
        FactHandle fh = ksession.insert(customer);
        ksession.fireAllRules();
        ksession.delete(fh);
        logger.info("After rule {}", customer);

        customer = customerNormal();
        logger.info("KieSession fireAllRules. {}", customer);
        fh = ksession.insert(customer);
        ksession.fireAllRules();
        ksession.delete(fh);
        logger.info("After rule {}", customer);

        customer = customerVip();
        logger.info("KieSession fireAllRules. {}", customer);
        fh = ksession.insert(customer);
        ksession.fireAllRules();
        ksession.delete(fh);

        logger.info("After rule {}", customer);
    }

    /**
     * Dispose ksession
     */
    @Override
    public void stop(BundleContext context) throws Exception {
        if (ksession != null) {
            ksession.dispose();
            logger.debug("KieSession disposed.");
        }

    }

}