/*
* Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Sun designates this
* particular file as subject to the "Classpath" exception as provided
* by Sun in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*/
package javax.net;
import java.io.IOException;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.SocketException;
/**
* This class creates server sockets. It may be subclassed by other
* factories, which create particular types of server sockets. This
* provides a general framework for the addition of public socket-level
* functionality. It is the server side analogue of a socket factory,
* and similarly provides a way to capture a variety of policies related
* to the sockets being constructed.
*
* <P> Like socket factories, server Socket factory instances have
* methods used to create sockets. There is also an environment
* specific default server socket factory; frameworks will often use
* their own customized factory.
*
* @since 1.4
* @see SocketFactory
*
* @author David Brownell
*/
public abstract class ServerSocketFactory
{
//
// NOTE: JDK 1.1 bug in class GC, this can get collected
// even though it's always accessible via getDefault().
//
private static ServerSocketFactory theFactory;
/**
* Creates a server socket factory.
*/
protected ServerSocketFactory() { /* NOTHING */ }
/**
* Returns a copy of the environment's default socket factory.
*
* @return the <code>ServerSocketFactory</code>
*/
public static ServerSocketFactory getDefault()
{
synchronized (ServerSocketFactory.class) {
if (theFactory == null) {
//
// Different implementations of this method could
// work rather differently. For example, driving
// this from a system property, or using a different
// implementation than JavaSoft's.
//
theFactory = new DefaultServerSocketFactory();
}
}
return theFactory;
}
/**
* Returns an unbound server socket. The socket is configured with
* the socket options (such as accept timeout) given to this factory.
*
* @return the unbound socket
* @throws IOException if the socket cannot be created
* @see java.net.ServerSocket#bind(java.net.SocketAddress)
* @see java.net.ServerSocket#bind(java.net.SocketAddress, int)
* @see java.net.ServerSocket#ServerSocket()
*/
public ServerSocket createServerSocket() throws IOException {
throw new SocketException("Unbound server sockets not implemented");
}
/**
* Returns a server socket bound to the specified port.
* The socket is configured with the socket options
* (such as accept timeout) given to this factory.
*
* @param port the port to listen to
* @return the <code>ServerSocket</code>
* @exception IOException for networking errors
* @see java.net.ServerSocket#ServerSocket(int)
*/
public abstract ServerSocket createServerSocket(int port)
throws IOException;
/**
* Returns a server socket bound to the specified port, and uses the
* specified connection backlog. The socket is configured with
* the socket options (such as accept timeout) given to this factory.
*
* @param port the port to listen to
* @param backlog how many connections are queued
* @return the <code>ServerSocket</code>
* @exception IOException for networking errors
* @see java.net.ServerSocket#ServerSocket(int, int)
*/
public abstract ServerSocket
createServerSocket(int port, int backlog)
throws IOException;
/**
* Returns a server socket bound to the specified port,
* with a specified listen backlog and local IP.
* The <code>ifAddress</code> argument can be used on a multi-homed
* host for a <code>ServerSocket</code> that will only accept connect
* requests to one of its addresses. If <code>ifAddress</code> is null,
* it will accept connections on all local addresses. The socket is
* configured with the socket options (such as accept timeout) given
* to this factory.
*
* @param port the port to listen to
* @param backlog how many connections are queued
* @param ifAddress the network interface address to use
* @return the <code>ServerSocket</code>
* @exception IOException for networking errors
* @see java.net.ServerSocket#ServerSocket(int, int, java.net.InetAddress)
*/
public abstract ServerSocket
createServerSocket(int port, int backlog, InetAddress ifAddress)
throws IOException;
}
//
// The default factory has NO intelligence. In fact it's not clear
// what sort of intelligence servers need; the onus is on clients,
// who have to know how to tunnel etc.
//
class DefaultServerSocketFactory extends ServerSocketFactory {
DefaultServerSocketFactory()
{
/* NOTHING */
}
public ServerSocket createServerSocket()
throws IOException
{
return new ServerSocket();
}
public ServerSocket createServerSocket(int port)
throws IOException
{
return new ServerSocket(port);
}
public ServerSocket createServerSocket(int port, int backlog)
throws IOException
{
return new ServerSocket(port, backlog);
}
public ServerSocket
createServerSocket(int port, int backlog, InetAddress ifAddress)
throws IOException
{
return new ServerSocket(port, backlog, ifAddress);
}
}