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Micro Distribution of the Payara Project for IBM JDK
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/*
 *
 * Copyright (c) 2016-2017 Payara Foundation and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://github.com/payara/Payara/blob/master/LICENSE.txt
 * See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * The Payara Foundation designates this particular file as subject to the "Classpath"
 * exception as provided by the Payara Foundation in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */
package fish.payara.nucleus.notification.service;

import fish.payara.nucleus.notification.configuration.Notifier;
import fish.payara.nucleus.notification.configuration.NotifierConfiguration;
import fish.payara.nucleus.notification.domain.NotificationEvent;
import org.jvnet.hk2.annotations.Contract;

import javax.inject.Inject;
import java.util.concurrent.*;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * @author mertcaliskan
 */
@Contract
public abstract class QueueBasedNotifierService extends BaseNotifierService {

    @Inject
    protected MQ queue;

    private final String prefix;
    private final AtomicInteger threadNumber = new AtomicInteger(1);
    private ScheduledExecutorService executor;
    protected ScheduledFuture scheduledFuture;

    public QueueBasedNotifierService(String prefix) {
        this.prefix = prefix;
    }

    protected void initializeExecutor() {
        executor = Executors.newScheduledThreadPool(1, new ThreadFactory() {
            public Thread newThread(Runnable r) {
                return new Thread(r, prefix + threadNumber.getAndIncrement());
            }
        });
    }

    protected ScheduledFuture scheduleExecutor(NotificationRunnable notificationRunnable) {
        return executor.scheduleWithFixedDelay(notificationRunnable,
                0,
                500,
                TimeUnit.MILLISECONDS);
    }

    /**
     * Unregisters the service and cleans up any information stored in it
     * This function does NOT restart the service.
     */
    protected void reset() {
        super.reset(this);
        queue.resetQueue();
        if (scheduledFuture != null) {
            scheduledFuture.cancel(true);
        }
        //initializeExecutor();
    }
    
    /**
     * Shuts down the service
     */
    @Override
    public void shutdown(){
        if (executor != null){
            executor.shutdown();
        }
        reset();
    }
}