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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2012 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.grizzly.memory;

import org.glassfish.grizzly.Grizzly;
import org.glassfish.grizzly.nio.SelectionKeyHandler;

import java.util.logging.Level;
import java.util.logging.Logger;

class MemoryManagerInitializer {

    private static final String PROP = "org.glassfish.grizzly.DEFAULT_MEMORY_MANAGER";

        private static final Logger LOGGER = Grizzly.logger(MemoryManagerInitializer.class);

        @SuppressWarnings("unchecked")
        static MemoryManager initManager() {
            final String className = System.getProperty(PROP);
            if (className != null) {
                try {
                    Class mmClass = (Class)
                            Class.forName(className,
                                          true,
                                          SelectionKeyHandler.class.getClassLoader());
                    return mmClass.newInstance();
                } catch (Exception e) {
                    if (LOGGER.isLoggable(Level.SEVERE)) {
                        LOGGER.log(Level.SEVERE,
                                "Unable to load or create a new instance of MemoryManager {0}.  Cause: {1}",
                                new Object[]{className, e.getMessage()});
                    }
                    if (LOGGER.isLoggable(Level.FINE)) {
                        LOGGER.log(Level.FINE, e.toString(), e);
                    }
                    return new HeapMemoryManager();
                }
            }
            return new HeapMemoryManager();
        }

}