Created ack number generator for use by multiple services

#story[1100]

racevisionGame/src/main/java/network/AckSequencer.java

@@ -0,0 +1,21 @@
+package network;
+
+import java.util.concurrent.atomic.AtomicInteger;
+
+/**
+ * Common source of ack numbers for all messages
+ */
+public class AckSequencer {
+    /**
+     * Generator for ack numbers
+     */
+    private static AtomicInteger ackNum = new AtomicInteger(0);
+
+    /**
+     * Retrieve next ack number
+     * @return next ack number
+     */
+    public static int getNextAckNum() {
+        return ackNum.getAndIncrement();
+    }
+}