/* * * Copyright (c) 1997-1999 Scott Oaks and Henry Wong. All Rights Reserved. * * Permission to use, copy, modify, and distribute this software * and its documentation for NON-COMMERCIAL purposes and * without fee is hereby granted. * * This sample source code is provided for example only, * on an unsupported, as-is basis.  * * AUTHOR MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF * THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED * TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A * PARTICULAR PURPOSE, OR NON-INFRINGEMENT. AUTHOR SHALL NOT BE LIABLE FOR * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. * * THIS SOFTWARE IS NOT DESIGNED OR INTENDED FOR USE OR RESALE AS ON-LINE * CONTROL EQUIPMENT IN HAZARDOUS ENVIRONMENTS REQUIRING FAIL-SAFE * PERFORMANCE, SUCH AS IN THE OPERATION OF NUCLEAR FACILITIES, AIRCRAFT * NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL, DIRECT LIFE * SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH THE FAILURE OF THE * SOFTWARE COULD LEAD DIRECTLY TO DEATH, PERSONAL INJURY, OR SEVERE * PHYSICAL OR ENVIRONMENTAL DAMAGE ("HIGH RISK ACTIVITIES").  AUTHOR * SPECIFICALLY DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR * HIGH RISK ACTIVITIES. */import java.net.*;import java.io.*;public class MultiHostSocketFactory {	private Socket sock;	private Thread target;	class ConnectThread extends Thread {		String host;		int port;		MultiHostSocketFactory parent;		ConnectThread(String host, int port, MultiHostSocketFactory parent) {			this.host = host;			this.port = port;			this.parent = parent;		}		public void run() {			try {				Socket tempSock = new Socket(host, port);				synchronized(parent) {					if (parent.target != this)						return;					parent.sock = tempSock;					parent.notify();				}			} catch (IOException ioe) {				synchronized(parent) {					parent.notify();				}			}		}	}	public Socket makeSocket(String hosts[], int port) {		int i;		sock = null;		synchronized(this) {			for (i = 0; i < hosts.length && sock == null; i++) {				ConnectThread th =						new ConnectThread(hosts[i], port, this);				target = th;				th.start();				try {				    wait(30 * 1000);				} catch (InterruptedException ie) {}				if (sock == null)					th.interrupt();			}		}		return sock;	}	public static void main(String args[]) {	    System.out.println("Got " +		new MultiHostSocketFactory().makeSocket(args, 7));	}}