public QueuedClientSocketFactory() 
{

}

 public QueuedClientSocketFactory(long nPermits) 
{
      permits = new FIFOSemaphore(nPermits);
      numPermits = nPermits;
}

 public Socket createSocket(String host,
    int port) throws IOException 
{
      try
      {
         permits.acquire();
         return new Socket(host, port);
      }
      catch (InterruptedException ex)
      {
         throw new IOException("Failed to acquire FIFOSemaphore for ClientSocketFactory");
      }
      finally
      {
         permits.release();
      }
}

Create a server socket on the specified port (port 0 indicates an anonymous port).

 public boolean equals(Object obj) 
{
      return obj instanceof QueuedClientSocketFactory;
}

 public int hashCode() 
{
      return getClass().getName().hashCode();
}

 public  void readExternal(ObjectInput in) throws ClassNotFoundException, IOException 
{
      numPermits = in.readLong();
      permits = new FIFOSemaphore(numPermits);
}

 public  void writeExternal(ObjectOutput out) throws IOException 
{
      out.writeLong(numPermits);
}