LocationUpdates: only trigger onLocationChanged, if the location

actually changed.

src/de/tud/kom/p2psim/impl/topology/DefaultTopologyComponent.java

@@ -319,6 +319,8 @@ public class DefaultTopologyComponent implements TopologyComponent {
 		private long interval = 1 * Simulator.MINUTE_UNIT;
 
 		private int priority = LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY;
+		
+		private Location lastLocation = null;
 
 		private List<LocationListener> listeners = new LinkedList<LocationListener>();
 
@@ -359,7 +361,11 @@ public class DefaultTopologyComponent implements TopologyComponent {
 		public void eventOccurred(Object content, int type) {
 			if (!listeners.isEmpty()) {
 				// Only reschedule, if at least one listener is ... listening
-				listeners.forEach((LocationListener listener) -> listener.onLocationChanged(getLastLocation()));
+				Location newLoc = getLastLocation();
+				if (lastLocation == null || lastLocation.distanceTo(newLoc) > 0) {
+					listeners.forEach((LocationListener listener) -> listener.onLocationChanged(newLoc));
+					lastLocation = newLoc;
+				}
 				Event.scheduleWithDelay(interval, this, null, 0);
 			}
 		}