EventListener.java

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2010 Oracle 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://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/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 packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle 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 org.glassfish.api.event;

/**
 * Code that wish to listen to glassfish events should implement this interface
 * and register it to the Events contract implementation.
 * 
 * User: Jerome Dochez
 */
public interface EventListener {

    public void event(Event event);

    public class Event<T> {
        final long inception;
        final EventTypes<T> type;
        final T hook;

        public Event(EventTypes<T> type) {
            if (type.getHookType()!=null) {
                throw new IllegalArgumentException("Null event hook [" + type.getHookType() + "]");
            }
            inception = System.currentTimeMillis();
            this.type = type;
            this.hook = null;
        }

        public Event(EventTypes<T> type, T hook) {
            inception = System.currentTimeMillis();
            this.type = type;
            this.hook = hook;
        }

        public long inception() {
            return inception;
        }

        public String name() {
            return type.type();
        }

        public boolean is(EventTypes type) {
            return type==this.type;
        }

        public T hook() {
            return type.getHookType().cast(hook);
        }

        public EventTypes<T> type() {
            return type;
        }
    }

}