TCPServerSocket.java

/*-*- mode: Java; tab-width:8 -*-*/

package php.java.bridge;

/*
 * Copyright (C) 2003-2007 Jost Boekemeier
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

import java.io.IOException;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;

// Note: Make sure that classes like Util or JavaBridge are only accessed if something fails
// The default path should only load the Standalone and the Socket classes
class TCPServerSocket implements ISocketFactory {

    static int TCP_PORT_BASE=9267; //try to find a free port in the range 9267, ..., 9366
    private ServerSocket sock;
    private int port;
    boolean local;
    
    public static ISocketFactory create(String name, int backlog) throws IOException {
	int p;
	boolean local = false;

	if(name==null) throw new NullPointerException ("name");
	if(name.startsWith("INET:")) name=name.substring(5);
	else if(name.startsWith("INET_LOCAL:")) { local = true; name=name.substring(11); }
	    
	p=Integer.parseInt(name);
	TCPServerSocket s = new TCPServerSocket(p, backlog, local);
	return s;
    }

    private ServerSocket newServerSocket (int port, int backlog) throws java.io.IOException {
	try {
	    if(local)
		return new ServerSocket(port, backlog, InetAddress.getByName("127.0.0.1"));
	} catch (java.net.UnknownHostException e) {/*cannot happen*/}
	return new ServerSocket(port, backlog);
    }

    private void findFreePort(int start, int backlog) {
	for (int port = start; port < start+100; port++) {
	    try {
		this.sock = newServerSocket(port, backlog);
		this.port = port;
		return;
	    } catch (IOException e) {continue;}
	    
	}
    }

    private TCPServerSocket(int port, int backlog, boolean local) throws IOException {
	this.local = local;
	if(port==0) {
	    findFreePort(TCP_PORT_BASE, backlog);
	} else {
	    this.sock = newServerSocket(port, backlog);    
	    this.port = port;
	}
    }
	
    public void close() throws IOException {
	sock.close();
    }

    public Socket accept() throws IOException {
	Socket s = sock.accept();
	s.setTcpNoDelay(true);
 	return s;
    }
    public String getSocketName() {
    	return String.valueOf(port);
    }
    public String toString() {
    	return (local?"INET_LOCAL:":"INET:") +getSocketName();
    }
}