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/*******************************************************************************
* Copyright (c) 2004, 2007 Boeing.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Boeing - initial API and implementation
*******************************************************************************/
package org.eclipse.osee.framework.jdk.core.util;
import java.net.BindException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.nio.channels.DatagramChannel;
public class SingletonApplicationInstance {
public static void verifySingleton(int port) throws Exception {
if (findOther(port)) {
System.out.println("found another instance");
} else {
System.out.println("no other instance found");
}
}
private static boolean findOther(int port) throws Exception {
InetAddress host = InetAddress.getLocalHost();
try {
DatagramChannel channel = DatagramChannel.open();
channel.configureBlocking(true);
InetSocketAddress address = new InetSocketAddress(host, port);
channel.socket().bind(address);
return false;
} catch (BindException e) {
return true;
}
}
public static void main(String[] args) {
try {
verifySingleton(32900);
System.in.read();
} catch (Exception e) {
e.printStackTrace();
}
}
}
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