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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * 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;

import com.google.common.eventbus.EventBus;
import fish.payara.nucleus.notification.domain.NotificationEvent;
import fish.payara.nucleus.notification.service.BaseNotifierService;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.glassfish.api.StartupRunLevel;
import org.glassfish.hk2.runlevel.RunLevel;
import org.jvnet.hk2.annotations.Service;

/**
 * @author mertcaliskan
 *
 * Service class that holds an instance of guava pub-sub event bus where notifier services register themselves in order to be
 * notified according to a given notification event post.
 */
@Service(name = "notification-eventbus")
@RunLevel(StartupRunLevel.VAL)
public class NotificationEventBus {

    private EventBus eventBus = new EventBus();

    public void register(BaseNotifierService notifier) {
        eventBus.register(notifier);
    }

    public void unregister(BaseNotifierService notifier) {
        try {
            eventBus.unregister(notifier);
        } catch (IllegalArgumentException e){
            Logger.getLogger(NotificationEventBus.class.getCanonicalName()).log(Level.WARNING, "Tried to unregister" + notifier.toString() + ", it may not have been previously registered");
        }
    }

    void postEvent(NotificationEvent event) {
        eventBus.post(event);
    }
}