NetworkTopologyDiscovery.java

Go to the documentation of this file.

package javax.jmdns;

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.util.concurrent.atomic.AtomicReference;

import javax.jmdns.impl.NetworkTopologyDiscoveryImpl;

public interface NetworkTopologyDiscovery {

    public static final class Factory {
        private static volatile NetworkTopologyDiscovery _instance;

        public static interface ClassDelegate {

            public NetworkTopologyDiscovery newNetworkTopologyDiscovery();
        }

        private static final AtomicReference<Factory.ClassDelegate> _databaseClassDelegate = new AtomicReference<Factory.ClassDelegate>();

        private Factory() {
            super();
        }

        public static void setClassDelegate(Factory.ClassDelegate delegate) {
            _databaseClassDelegate.set(delegate);
        }

        public static Factory.ClassDelegate classDelegate() {
            return _databaseClassDelegate.get();
        }

        protected static NetworkTopologyDiscovery newNetworkTopologyDiscovery() {
            NetworkTopologyDiscovery instance = null;
            Factory.ClassDelegate delegate = _databaseClassDelegate.get();
            if (delegate != null) {
                instance = delegate.newNetworkTopologyDiscovery();
            }
            return (instance != null ? instance : new NetworkTopologyDiscoveryImpl());
        }

        public static NetworkTopologyDiscovery getInstance() {
            if (_instance == null) {
                synchronized (NetworkTopologyDiscovery.Factory.class) {
                    if (_instance == null) {
                        _instance = NetworkTopologyDiscovery.Factory.newNetworkTopologyDiscovery();
                    }
                }
            }
            return _instance;
        }
    }

    public abstract InetAddress[] getInetAddresses();

    public boolean useInetAddress(NetworkInterface networkInterface, InetAddress interfaceAddress);

    public void lockInetAddress(InetAddress interfaceAddress);

    public void unlockInetAddress(InetAddress interfaceAddress);

}