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/*
* JBoss, Home of Professional Open Source
* Copyright 2005, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.test.remoting;
import java.io.IOException;
import java.net.ServerSocket;
import java.security.SecureRandom;
import org.jboss.logging.Logger;
/**
* @author <a href="mailto:tom.elrod@jboss.com">Tom Elrod</a>
*/
public class TestUtil
{
private static final Logger log = Logger.getLogger(TestUtil.class);
public static int getRandomPort()
{
Integer port = null;
while(port == null)
{
port = getFreePort();
if(port != null)
{
// validate port again, just in case two instances start on the port at same time.
port = validatePort(port.intValue());
}
}
return port.intValue();
}
private static Integer getFreePort()
{
Object o = new Object();
String os = o.toString();
os = os.substring(17);
int n = Integer.parseInt(os, 16);
int p = Math.abs(new SecureRandom(String.valueOf(System.currentTimeMillis() + n).getBytes()).nextInt(2000)) + 2000;
return validatePort(p);
}
private static Integer validatePort(int p)
{
Integer port = null;
ServerSocket socket = null;
try
{
socket = new ServerSocket(p);
port = new Integer(p);
}
catch(IOException e)
{
log.debug("port " + p + " already in use. Will try another.");
port = null;
}
finally
{
if(socket != null)
{
try
{
socket.close();
}
catch(IOException e)
{
}
}
}
return port;
}
}
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