Added shutdown requested mechanism

src/services/CoreManager.java

@@ -41,8 +41,10 @@ public class CoreManager extends Manager {
 	private GalacticManager galacticManager;
 	private Galaxy galaxy;
 	private long startTime;
+	private boolean shutdownRequested;
 	
 	public CoreManager() {
+		shutdownRequested = false;
 		galaxy = getGalaxy();
 		if (galaxy != null) {
 			engineManager = new EngineManager(galaxy);
@@ -61,6 +63,10 @@ public class CoreManager extends Manager {
 		return true;
 	}
 	
+	public boolean isShutdownRequested() {
+		return shutdownRequested;
+	}
+	
 	@Override
 	public boolean initialize() {
 		startTime = System.nanoTime();