Fix bugs that server doesn't send boat location before and after the race.

- server will sends boat location not only during the race, but also before the race and after all boats have finished the race.
- refactored simulator so that it runs at the begining to send boat location, and if its "isStarted" set to true, then it starts moving the boats.

#story[715]

src/main/java/seng302/server/ServerThread.java

@@ -32,7 +32,12 @@ public class ServerThread implements Runnable, Observer {
     public ServerThread(String threadName){
         runner = new Thread(this, threadName);
         serverLog("Spawning Server", 0);
+
         raceSimulator = new Simulator(BOAT_LOCATION_PERIOD);
+        raceSimulator.addObserver(this);
+        // run race simulator, so it can send boats' static location.
+        Thread raceSimulatorThread = new Thread(raceSimulator, "Race Simulator");
+
         boats = raceSimulator.getBoats();
 
         for (Boat b : boats){
@@ -40,6 +45,7 @@ public class ServerThread implements Runnable, Observer {
         }
 
         runner.start();
+        raceSimulatorThread.start();
     }
 
     public static void serverLog(String message, int logLevel){
@@ -130,9 +136,9 @@ public class ServerThread implements Runnable, Observer {
      * Starts an instance of the race simulator
      */
     private void startRaceSim(){
-        serverLog("Starting Race Simulator", 0);
-        raceSimulator.addObserver(this);
-        new Thread(raceSimulator).start();
+        serverLog("Starting Running Race Simulator", 0);
+        // set race started to true, so the simulator will start moving boats
+        raceSimulator.setRaceStarted(true);
     }
 
     /**
@@ -258,11 +264,12 @@ public class ServerThread implements Runnable, Observer {
     @Override
     public void update(Observable o, Object arg) {
         // Only send if server started
-        if(!server.isStarted()){
+        // TODO: I don't understand why i need to check server is null or not ... confused - haoming 2/5/17
+        if(server == null || !server.isStarted()){
             return;
         }
 
-        for (Boat b : ((Simulator) o).getBoats()){
+        for (Boat b : (List<Boat>) arg){
             try {
                 Message m = new BoatLocationMessage(b.getSourceID(), 1, b.getLat(),
                         b.getLng(), b.getLastPassedCorner().getBearingToNextCorner(),
@@ -273,6 +280,8 @@ public class ServerThread implements Runnable, Observer {
                 return;
             }
             catch (NullPointerException e){
+                //e.printStackTrace();
+                //TODO: add a method in boat to check if a boat has finished the race. - haoming 2/5/17
                 serverLog("Boat " + b.getSourceID() + " finished the race", 1);
                 boatsFinished.put(b.getSourceID(), true);
             }

src/main/java/seng302/server/simulator/Simulator.java

@@ -14,6 +14,7 @@ public class Simulator extends Observable implements Runnable {
 	private List<Corner> course;
 	private List<Boat> boats;
 	private long lapse;
+	private boolean isRaceStarted;
 
 	/**
 	 * Creates a simulator instance with given time lapse.
@@ -24,6 +25,7 @@ public class Simulator extends Observable implements Runnable {
 		course = rp.getCourse();
 		boats = rp.getBoats();
 		this.lapse = lapse;
+		isRaceStarted = false;
 
 		setLegs();
 
@@ -35,7 +37,7 @@ public class Simulator extends Observable implements Runnable {
 			boat.setLng(startLng);
 			boat.setLastPassedCorner(course.get(0));
 			boat.setHeadingCorner(course.get(1));
-			boat.setSpeed(ThreadLocalRandom.current().nextInt(40000, 60000 + 1));
+			boat.setSpeed(ThreadLocalRandom.current().nextInt(400000, 600000 + 1));
 		}
 	}
 
@@ -45,15 +47,18 @@ public class Simulator extends Observable implements Runnable {
 		int numOfFinishedBoats = 0;
 
 		while (numOfFinishedBoats < boats.size()) {
+
+			// if race has started, then boat should start to move.
+			if (isRaceStarted) {
 				for (Boat boat : boats) {
 					numOfFinishedBoats += moveBoat(boat, lapse);
 				}
+			}
 			//System.out.println(boats.get(0));
 
 			setChanged();
 			notifyObservers(boats);
 
-			// sleep for 1 second.
 			try {
 				Thread.sleep(lapse);
 			} catch (InterruptedException e) {
@@ -64,7 +69,6 @@ public class Simulator extends Observable implements Runnable {
 
 	/**
 	 * Moves a boat with given time duration.
-	 *
 	 * @param boat the boat to be moved
 	 * @param duration the moving duration in milliseconds
 	 * @return 1 if the boat has reached the final line, otherwise return 0
@@ -126,4 +130,7 @@ public class Simulator extends Observable implements Runnable {
 		return boats;
 	}
 
+	public void setRaceStarted(boolean raceStarted) {
+		isRaceStarted = raceStarted;
+	}
 }