/*
 * Copyright (C) The Apache Software Foundation. All rights reserved.
 *
 * This software is published under the terms of the Apache Software
 * License version 1.1, a copy of which has been included with this
 * distribution in the LICENSE.APL file.  */

package examples;

import java.rmi.Remote;
import java.rmi.server.UnicastRemoteObject;
import java.rmi.RemoteException;
import java.rmi.Naming;
import java.util.Vector;
import java.io.*;

/**
   NumberCruncherClient is a simple client for factoring integers. A
   remote NumberCruncher is contacted and asked to factor an
   integer. The factors returned by the {@link NumberCruncherServer}
   are displayed on the screen.

   
See source code of 
   NumberCruncherClient for more details.

   
   Usage: java  org.apache.log4j.examples.NumberCruncherClient HOST
        where HOST is the machine where the NumberCruncherServer is running
   
   
   
Note that class files for the example code is not included in
   any of the distributed log4j jar files. You will have to add the
   directory /dir-where-you-unpacked-log4j/classes to
   your classpath before trying out the examples.

   @author Ceki Gülcü
   
 */
public class NumberCruncherClient {


  public static void main(String[] args) {
    if(args.length == 1) {
      try {
        String url = "rmi://"+args[0]+ "/Factor";
      	NumberCruncher nc = (NumberCruncher) Naming.lookup(url);
	loop(nc);
      }
      catch(Exception e) {
	e.printStackTrace();
      }      
    }
    else
      usage("Wrong number of arguments.");
  }

  static
  void usage(String msg) {
    System.err.println(msg);
    System.err.println(
     "Usage: java org.apache.log4j.examples.NumberCruncherClient HOST\n" +
     "   where HOST is the machine where the NumberCruncherServer is running.");
    System.exit(1);
  }


  static
  void loop(NumberCruncher nc) {
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    int i = 0;
    while (true) {
      System.out.print("Enter a number to factor, '-1' to quit: ");      
      try {
	i = Integer.parseInt(in.readLine());
      }
      catch(Exception e) {
	e.printStackTrace();
      }
      if(i == -1) {
	System.out.print("Exiting loop.");
	return;
      }
      else {
	try {
	  System.out.println("Will attempt to factor "+i);
	  int[] factors = nc.factor(i);
	  System.out.print("The factors of "+i+" are");
	  for(int k=0; k < factors.length; k++) {
	    System.out.print(" " + factors[k]);
	  }
	  System.out.println(".");
	}
	catch(RemoteException e) {
	  System.err.println("Could not factor "+i);
	  e.printStackTrace();
	}
      }
    }
  }
}