Roller() 
{
  // Static class.
}

 static  void init(String hostArg,
    String portArg) 
{
    host = hostArg;
    try {
      port =  Integer.parseInt(portArg);
    }
    catch(java.lang.NumberFormatException e) {
      usage("Second argument "+portArg+" is not a valid integer.");
    }
}

 public static  void main(String[] argv) 
{
    BasicConfigurator.configure();
    if(argv.length == 2) 
      init(argv[0], argv[1]);
    else 
      usage("Wrong number of arguments.");
    roll();
}

Send a "RollOver" message to ExternallyRolledFileAppender on host and port.

 static  void roll() 
{
    try {
      Socket socket = new Socket(host, port);
      DataOutputStream dos = new DataOutputStream(socket.getOutputStream());
      DataInputStream dis = new DataInputStream(socket.getInputStream());
      dos.writeUTF(ExternallyRolledFileAppender.ROLL_OVER);
      String rc = dis.readUTF();
      if(ExternallyRolledFileAppender.OK.equals(rc)) {
	cat.info("Roll over signal acknowledged by remote appender.");
      } else {
	cat.warn("Unexpected return code "+rc+" from remote entity.");
	System.exit(2);
      }
    } catch(IOException e) {
      cat.error("Could not send roll signal on host "+host+" port "+port+" .",
		e);
      System.exit(2);
    }
    System.exit(0);
}

 static  void usage(String msg) 
{
    System.err.println(msg);
    System.err.println( "Usage: java " + Roller.class.getName() +
			"host_name port_number");
    System.exit(1);
}