From 76fde044e35bf16c6a0af40aebd75df139cd8816 Mon Sep 17 00:00:00 2001
From: senft-desktop <senftt@gmail.com>
Date: Fri, 30 Nov 2012 16:27:21 +0100
Subject: [PATCH] Fixed the bug that caused all the lost acks. We just gave the
 new acks a random id, but we didnt check if we already had an ack with that
 id.

---
 ws2012/P2P/uebungen/4/src/node/Node.java | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/ws2012/P2P/uebungen/4/src/node/Node.java b/ws2012/P2P/uebungen/4/src/node/Node.java
index 54952ece..f85fd85a 100644
--- a/ws2012/P2P/uebungen/4/src/node/Node.java
+++ b/ws2012/P2P/uebungen/4/src/node/Node.java
@@ -106,6 +106,9 @@ public class Node {
 	 */
 	private Ack generateAck(final SocketAddress addr) {
 		int ack_id = generator.nextInt();
+        while (acks.containsKey(ack_id)) {
+            ack_id = generator.nextInt();
+        }
 		Ack newAck = new Ack(ack_id, addr, channel);
 		
 		acks.put(ack_id, newAck);