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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package examples;
import java.rmi.RemoteException;
import java.rmi.Naming;
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.
<p>See <a href=doc-files/NumberCruncherClient.java>source</a> code of
<code>NumberCruncherClient</code> for more details.
<pre>
<b>Usage:</b> java org.apache.log4j.examples.NumberCruncherClient HOST
where HOST is the machine where the NumberCruncherServer is running
</pre>
<p>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 <code>/dir-where-you-unpacked-log4j/classes</code> 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();
}
}
}
}
}
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