HSQLDB example source code file (HsqlSocketFactory.java)

This example HSQLDB source code file (HsqlSocketFactory.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 - HSQLDB tags/keywords

class, constructor, exception, exception, hsqlsocketfactory, hsqlsocketfactory, net, network, object, object, reflection, runtimeexception, serversocket, serversocket, socket, string, throwable

The HSQLDB HsqlSocketFactory.java source code

/* Copyright (c) 2001-2008, The HSQL Development Group
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the HSQL Development Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */


package org.hsqldb;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;

/**
 * Base class for producing the Socket objects used by HSQLDB.
 *
 * @author unsaved@users
 * @author boucherb@users
 * @version 1.7.2
 * @since 1.7.2
 */
public class HsqlSocketFactory {

// ----------------------------- static members ---------------------------------
    private static HsqlSocketFactory plainImpl;
    private static HsqlSocketFactory sslImpl;

// ------------------------------ constructors ---------------------------------

    /**
     * External construction disabled.  New factory instances are retreived
     * through the newHsqlSocketFactory method instead.
     */
    protected HsqlSocketFactory() throws Exception {}

// ------------------------- factory builder method ----------------------------

    /**
     * Retrieves an HsqlSocketFactory whose subclass and attributes are
     * determined by the specified argument, tls.
     *
     * @param tls whether to retrieve a factory producing SSL sockets
     * @throws Exception if the new factory cannot be constructed or is
     *      of the wrong type
     * @return a new factory
     */
    public static HsqlSocketFactory getInstance(boolean tls)
    throws Exception {
        return tls ? getSSLImpl()
                   : getPlainImpl();
    }

// -------------------------- public instance methods --------------------------
    public void configureSocket(Socket socket) {

        // default: do nothing
    }

    /**
     * Returns a server socket bound to the specified port.
     * The socket is configured with the socket options
     * given to this factory.
     *
     * @return the ServerSocket
     * @param port the port to which to bind the ServerSocket
     * @throws Exception if a network error occurs
     */
    public ServerSocket createServerSocket(int port) throws Exception {
        return new ServerSocket(port);
    }

    /**
     * Returns a server socket bound to the specified port.
     * The socket is configured with the socket options
     * given to this factory.
     *
     * @return the ServerSocket
     * @param port the port to which to bind the ServerSocket
     * @throws Exception if a network error occurs
     */
    public ServerSocket createServerSocket(int port,
                                           String address) throws Exception {
        return new ServerSocket(port, 128, InetAddress.getByName(address));
    }

    /**
     * Creates a socket and connects it to the specified remote host at the
     * specified remote port. This socket is configured using the socket options
     * established for this factory.
     *
     * @return the socket
     * @param host the server host
     * @param port the server port
     * @throws Exception if a network error occurs
     */
    public Socket createSocket(String host, int port) throws Exception {
        return new Socket(host, port);
    }

    /**
     * Retrieves whether this factory produces secure sockets.
     *
     * @return true if this factory produces secure sockets
     */
    public boolean isSecure() {
        return false;
    }

// ------------------------ static utility methods -----------------------------
    private static HsqlSocketFactory getPlainImpl() throws Exception {

        synchronized (HsqlSocketFactory.class) {
            if (plainImpl == null) {
                plainImpl = new HsqlSocketFactory();
            }
        }

        return plainImpl;
    }

    private static HsqlSocketFactory getSSLImpl() throws Exception {

        synchronized (HsqlSocketFactory.class) {
            if (sslImpl == null) {
                sslImpl = newFactory("org.hsqldb.HsqlSocketFactorySecure");
            }
        }

        return sslImpl;
    }

    /**
     * Retrieves a new HsqlSocketFactory whose class
     * is determined by the implClass argument. The basic contract here
     * is that implementations constructed by this method should return
     * true upon calling isSecure() iff they actually create secure sockets.
     * There is no way to guarantee this directly here, so it is simply
     * trusted that an  implementation is secure if it returns true
     * for calls to isSecure();
     *
     * @return a new secure socket factory
     * @param implClass the fully qaulified name of the desired
     *      class to construct
     * @throws Exception if a new secure socket factory cannot
     *      be constructed
     */
    private static HsqlSocketFactory newFactory(String implClass)
    throws Exception {

        Class       clazz;
        Constructor ctor;
        Class[]     ctorParm;
        Object[]    ctorArg;
        Object      factory;

        clazz    = Class.forName(implClass);
        ctorParm = new Class[0];

        // protected constructor
        ctor    = clazz.getDeclaredConstructor(ctorParm);
        ctorArg = new Object[0];

        try {
            factory = ctor.newInstance(ctorArg);
        } catch (InvocationTargetException e) {
            Throwable t = e.getTargetException();

            throw (t instanceof Exception) ? ((Exception) t)
                                           : new RuntimeException(
                                               t.toString());
        }

        return (HsqlSocketFactory) factory;
    }

// --
}