Prevent duplicate analyzer registrations

src/de/tud/kom/p2psim/impl/common/DefaultMonitor.java

@@ -85,8 +85,10 @@ public class DefaultMonitor implements MonitorComponent, EventHandler,
 
 	@Override
 	public <A extends Analyzer> void registerAnalyzer(A analyzer) {
+		if (!analyzers.contains(analyzer)) {
 			analyzers.add(analyzer);
 		}
+	}
 
 	@Override
 	public void log(Class<?> subject, Level level, String msg, Object... data) {