Participants can now join during the warning period as well.

Added RaceDataSourceToXML.
RaceServer now create an XMLMessage when the race's RaceDataSource changes.
#story[1188]

racevisionGame/src/main/java/mock/model/ClientConnection.java

@@ -109,6 +109,11 @@ public class ClientConnection implements Runnable {
      */
     private ConnectionStateEnum connectionState = ConnectionStateEnum.UNKNOWN;
 
+    /**
+     * The source ID that has been allocated to the client.
+     * 0 means not allocated.
+     */
+    private int allocatedSourceID = 0;
 
 
 
@@ -178,7 +183,7 @@ public class ClientConnection implements Runnable {
 
         RequestToJoin requestToJoin = waitForRequestToJoin();
 
-        int allocatedSourceID = 0;
+        allocatedSourceID = 0;
 
         //If they want to participate, give them a source ID number.
         if (requestToJoin.getRequestType() == RequestToJoinEnum.PARTICIPANT) {
@@ -283,6 +288,10 @@ public class ClientConnection implements Runnable {
         if (this.controllerServerThread != null) {
             this.controllerServerThread.interrupt();
         }
+
+        if (allocatedSourceID != 0) {
+            sourceIdAllocator.returnSourceID(allocatedSourceID);
+        }
     }
 
 }