NetworkChecker.java

/*
 * This file is part of Arduino.
 *
 * Arduino is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * As a special exception, you may use this file as part of a free software
 * library without restriction.  Specifically, if other files instantiate
 * templates or use macros or inline functions from this file, or you compile
 * this file and link it with other files to produce an executable, this
 * file does not by itself cause the resulting executable to be covered by
 * the GNU General Public License.  This exception does not however
 * invalidate any other reasons why the executable file might be covered by
 * the GNU General Public License.
 *
 * Copyright 2013 Arduino LLC (http://www.arduino.cc/)
 */

package cc.arduino.packages.discoverers;

import java.net.InetAddress;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import java.util.Timer;
import java.util.TimerTask;

import javax.jmdns.NetworkTopologyDiscovery;

public class NetworkChecker extends TimerTask {

    private final NetworkTopologyDiscovery topology;

    private Set<InetAddress> knownAddresses;

    public NetworkChecker(NetworkTopologyDiscovery topology) {
	super();
	this.topology = topology;
	this.knownAddresses = Collections.synchronizedSet(new HashSet<InetAddress>());
    }

    public void start(Timer timer) {
	timer.schedule(this, 0, 3000);
    }

    @Override
    public void run() {
	try {
	    InetAddress[] curentAddresses = this.topology.getInetAddresses();
	    Set<InetAddress> current = new HashSet<>(curentAddresses.length);
	    for (InetAddress address : curentAddresses) {
		current.add(address);
		if (!this.knownAddresses.contains(address)) {
		    NetworkDiscovery.inetAddressAdded(address);
		}
	    }
	    for (InetAddress address : this.knownAddresses) {
		if (!current.contains(address)) {
		    NetworkDiscovery.inetAddressRemoved(address);
		}
	    }
	    this.knownAddresses = current;
	} catch (Exception e) {
	    e.printStackTrace();
	}
    }
}