Renamed Heartbeat to HeartBeat.

Added HeartBeatDecoder.
Added HeartBeatEncoder.
BinaryMessageDecoder now uses HeartBeatDecoder.
MockOutput now logs a warning if a heartBeat cannot be encoded.
Added HeartBeatDecoderTest.
issue #35 #36
#story[1095]

racevisionGame/src/main/java/mock/app/MockOutput.java

@@ -7,12 +7,9 @@ import network.Exceptions.InvalidMessageException;
 import network.MessageEncoders.RaceVisionByteEncoder;
 import network.Messages.*;
 import network.Messages.Enums.MessageType;
-import network.Messages.Enums.XMLMessageType;
 
 import java.io.DataOutputStream;
 import java.io.IOException;
-import java.net.ServerSocket;
-import java.net.Socket;
 import java.net.SocketException;
 import java.util.logging.Level;
 import java.util.logging.Logger;
@@ -101,24 +98,25 @@ public class MockOutput implements Runnable
      * Generates the next heartbeat message and returns it. Increments the heartbeat sequence number.
      * @return The next heartbeat message.
      */
-    private Heartbeat createHeartbeatMessage() {
+    private HeartBeat createHeartbeatMessage() {
 
         //Create the heartbeat message.
-        Heartbeat heartbeat = new Heartbeat(this.heartbeatSequenceNum);
+        HeartBeat heartBeat = new HeartBeat(this.heartbeatSequenceNum);
         heartbeatSequenceNum++;
 
-        return heartbeat;
+        return heartBeat;
     }
 
     /**
      * Serializes a heartbeat message into a packet to be sent, and returns the byte array.
-     * @param heartbeat The heartbeat message to serialize.
+     * @param heartBeat The heartbeat message to serialize.
      * @return Byte array containing the next heartbeat message.
+     * @throws InvalidMessageException Thrown if the message cannot be encoded.
      */
-    private byte[] parseHeartbeat(Heartbeat heartbeat) {
+    private byte[] parseHeartbeat(HeartBeat heartBeat) throws InvalidMessageException {
 
         //Serializes the heartbeat message.
-        byte[] heartbeatMessage = RaceVisionByteEncoder.heartBeat(heartbeat);
+        byte[] heartbeatMessage = RaceVisionByteEncoder.encode(heartBeat);
 
         //Places the serialized message in a packet.
         BinaryMessageEncoder binaryMessageEncoder = new BinaryMessageEncoder(
@@ -213,7 +211,15 @@ public class MockOutput implements Runnable
     public void sendHeartBeat() throws IOException {
         //Sends a heartbeat every so often.
         if (timeSinceHeartbeat() >= heartbeatPeriod) {
-            outToVisualiser.write(parseHeartbeat(createHeartbeatMessage()));
+
+            HeartBeat heartBeat = createHeartbeatMessage();
+
+            try {
+                outToVisualiser.write(parseHeartbeat(heartBeat));
+            } catch (InvalidMessageException e) {
+                Logger.getGlobal().log(Level.WARNING, "Could not encode HeartBeat: " + heartBeat, e);
+            }
+
             lastHeartbeatTime = System.currentTimeMillis();
         }
     }