public HUPNode(Socket socket,
    ExternallyRolledFileAppender er) 
{
    this.socket = socket;
    this.er = er;
    try {
      dis = new DataInputStream(socket.getInputStream());
      dos = new DataOutputStream(socket.getOutputStream());
    }
    catch(Exception e) {
      e.printStackTrace();
    }
}

 public  void run() 
{
    try {
      String line = dis.readUTF();
      LogLog.debug("Got external roll over signal.");
      if(ExternallyRolledFileAppender.ROLL_OVER.equals(line)) {
	synchronized(er) {
	  er.rollOver();
	}
	dos.writeUTF(ExternallyRolledFileAppender.OK);
      }
      else {
	dos.writeUTF("Expecting [RollOver] string.");
      }
      dos.close();
    }
    catch(Exception e) {
      LogLog.error("Unexpected exception. Exiting HUPNode.", e);
    }
}