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Glassfish example source code file (DataStructureFactory.java)

This example Glassfish source code file (DataStructureFactory.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Glassfish tags/keywords

constructor, datastructure, datastructure, exception, initializing, log, logging, object, object, poolingexception, poolingexception, privilegedaction, reflection, resourcehandler, rwlockdatastructure, security, string, string

The Glassfish DataStructureFactory.java source code

/*
 * 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 com.sun.enterprise.resource.pool.datastructure;

import com.sun.appserv.connectors.internal.api.PoolingException;
import com.sun.enterprise.resource.pool.ResourceHandler;
import com.sun.logging.LogDomains;

import java.lang.reflect.Constructor;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Factory to create appropriate datastructure type for the pool<br>
 *
 * @author Jagadish Ramu
 */
public class DataStructureFactory {
    //TODO synchronize datastructure creation ?
    protected final static Logger _logger = LogDomains.getLogger(DataStructureFactory.class,LogDomains.RSR_LOGGER);

    public static DataStructure getDataStructure(String className, String parameters, int maxPoolSize,
                                                 ResourceHandler handler, String strategyClass) throws PoolingException {
        DataStructure ds;

        if (className != null) {
            if(className.equals(ListDataStructure.class.getName())){
                ds = new ListDataStructure(parameters, maxPoolSize, handler, strategyClass);
            }else if(className.equals(RWLockDataStructure.class.getName())){
                ds = new RWLockDataStructure(parameters, maxPoolSize, handler, strategyClass);
            }else{
                ds = initializeCustomDataStructureInPrivilegedMode(className, parameters, maxPoolSize, handler, strategyClass);
            }
        } else {
            debug("Initializing RWLock DataStructure");
            ds = new RWLockDataStructure(parameters, maxPoolSize, handler, strategyClass);
        }
        return ds;
    }

    private static DataStructure initializeCustomDataStructureInPrivilegedMode(final String className,
                                                                               final String parameters,
                                                                               final int maxPoolSize,
                                                                               final ResourceHandler handler,
                                                                               final String strategyClass)
            throws PoolingException {
        Object result = AccessController.doPrivileged(new PrivilegedAction() {
            public Object run() {

                Object result = null;
                try {
                    result = initializeDataStructure(className, parameters, maxPoolSize, handler, strategyClass);
                } catch (Exception e) {
                    _logger.log(Level.WARNING, "pool.datastructure.init.failure", className);
                    _logger.log(Level.WARNING, "pool.datastructure.init.failure.exception", e);
                }
                return result;
            }
        });
        if (result != null) {
            return (DataStructure) result;
        } else {
            throw new PoolingException("Unable to initalize custom DataStructure : " + className);
        }
    }

    private static DataStructure initializeDataStructure(String className, String parameters, int maxPoolSize,
                                                         ResourceHandler handler, String strategyClass) throws Exception {
        DataStructure ds;
        Object[] constructorParameters = new Object[]{parameters, maxPoolSize, handler, strategyClass};

        Class class1 = Thread.currentThread().getContextClassLoader().loadClass(className);
        Constructor constructor = class1.getConstructor(String.class, int.class, ResourceHandler.class, String.class);
        ds = (DataStructure) constructor.newInstance(constructorParameters);
        if(_logger.isLoggable(Level.FINEST)) {
            _logger.log(Level.FINEST, "Using Pool Data Structure : ", className);
        }
        return ds;
    }

    private static void debug(String debugStatement) {
        if(_logger.isLoggable(Level.FINE)) {
            _logger.log(Level.FINE, debugStatement);
        }
    }
}

Other Glassfish examples (source code examples)

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