From 6686c280846e1aecabaa23f15ff9b9df8c303490 Mon Sep 17 00:00:00 2001
From: senft-lap <senftt@gmail.com>
Date: Tue, 6 Nov 2012 14:56:19 +0100
Subject: [PATCH] Cleared buffer

---
 .../src/buffered/BufferedNetworkStack.java    | 60 ++++++++++++-------
 .../buffered/BufferedNetworkStackClient.java  |  7 ++-
 2 files changed, 42 insertions(+), 25 deletions(-)

diff --git a/ws2012/P2P/uebungen/2/p2p_ex2/src/buffered/BufferedNetworkStack.java b/ws2012/P2P/uebungen/2/p2p_ex2/src/buffered/BufferedNetworkStack.java
index 396c75f5..760e70c7 100644
--- a/ws2012/P2P/uebungen/2/p2p_ex2/src/buffered/BufferedNetworkStack.java
+++ b/ws2012/P2P/uebungen/2/p2p_ex2/src/buffered/BufferedNetworkStack.java
@@ -5,6 +5,7 @@ import java.net.InetSocketAddress;
 import java.net.SocketAddress;
 import java.nio.ByteBuffer;
 import java.nio.channels.DatagramChannel;
+import java.util.ArrayList;
 import java.util.EmptyStackException;
 import java.util.Stack;
 
@@ -14,16 +15,18 @@ class BufferedNetworkStack {
 	 * One single element on the stack.
 	 */
 	public class Element {
+		public int id;
 		public String[] cunks;
 
-		public Element(int size) {
+		public Element(int size, int id) {
 			cunks = new String[size];
+			this.id = id;
 			System.out.println("Created new Element, size: " + size);
 		}
 
 		public boolean isComplete() {
 			for (String s : cunks) {
-				if (s.isEmpty()) {
+				if (s == null || s.isEmpty()) {
 					return false;
 				}
 			}
@@ -31,18 +34,11 @@ class BufferedNetworkStack {
 		}
 
 		public String toString() {
-			boolean flag = false;
 			StringBuilder result = new StringBuilder(16);
 			for (String s : cunks) {
-				if (!s.isEmpty()) {
-					result.append(s);
-					flag = true;
-				}
-			}
-			
-			// Add a flag, if the element is incomplete
-			if (flag) {
-				result.append(" (Incomplete)");
+				// if (!s.isEmpty()) {
+				result.append(s);
+				// }
 			}
 
 			return result.toString();
@@ -59,11 +55,14 @@ class BufferedNetworkStack {
 
 	protected static final int BUF_SIZE = 4;
 
-	private Stack<Element> stack;
+	private Stack<String> stack;
+
+	private ArrayList<Element> temp;
 
 	public BufferedNetworkStack(final int port) throws IOException {
 
-		stack = new Stack<Element>();
+		stack = new Stack<String>();
+		temp = new ArrayList<Element>();
 
 		channel = DatagramChannel.open();
 		channel.socket().bind(new InetSocketAddress(port));
@@ -90,7 +89,11 @@ class BufferedNetworkStack {
 				int size = Integer.valueOf(new Character(strReceived.charAt(1))
 						.toString());
 				String info = BUF_SIZE + "," + stack.size();
-				stack.push(new Element(size));
+
+				// stack.push(new Element(size));
+				// Pick better ID
+				int id = temp.size();
+				temp.add(id, new Element(size, id));
 
 				send(info, client);
 				break;
@@ -103,17 +106,28 @@ class BufferedNetworkStack {
 
 				String data = strReceived.substring(3);
 
-				System.out.println("Received chunk #" + chunk_id + " of data #"
-						+ data_id + ": " + data);
+				// System.out.println("Received chunk #" + chunk_id +
+				// " of data #"
+				// + data_id + ": " + data);
 
-				stack.get(data_id).cunks[chunk_id] = data;
+				temp.get(data_id).cunks[chunk_id] = data;
+
+				// stack.get(data_id).cunks[chunk_id] = data;
+				if (temp.get(data_id).isComplete()) {
+					// Move from temp stack
+					Element e = temp.get(data_id);
+					// temp.remove(e);
+					stack.add(e.toString());
+
+					// System.out.println("Moved " + e);
+				}
 				break;
 
 			case CMD_POP:
 				try {
-					Element popped = stack.pop();
-					send(popped.toString(), client);
-					System.out.println("Pop " + popped);
+					// Element popped = stack.pop();
+					// send(popped.toString(), client);
+					// System.out.println("Pop " + popped);
 				} catch (EmptyStackException e) {
 					System.out.println("Received pop but stack is empty");
 				}
@@ -137,8 +151,8 @@ class BufferedNetworkStack {
 
 	public String toString() {
 		StringBuilder result = new StringBuilder(128);
-		for (Element e : stack) {
-			result.append("[").append(e).append("],");
+		for (String s : stack) {
+			result.append("[").append(s).append("],");
 		}
 		result.append('\n');
 
diff --git a/ws2012/P2P/uebungen/2/p2p_ex2/src/buffered/BufferedNetworkStackClient.java b/ws2012/P2P/uebungen/2/p2p_ex2/src/buffered/BufferedNetworkStackClient.java
index b46611ca..c6a68eae 100644
--- a/ws2012/P2P/uebungen/2/p2p_ex2/src/buffered/BufferedNetworkStackClient.java
+++ b/ws2012/P2P/uebungen/2/p2p_ex2/src/buffered/BufferedNetworkStackClient.java
@@ -11,11 +11,13 @@ public class BufferedNetworkStackClient {
 	protected static final byte CMD_POP = '2';
 	protected static final byte CMD_PRINT = '3';
 
+	protected static final int BUF_SIZE = 128;
+
 	private DatagramChannel channel = null;
 	private ByteBuffer buf;
 
 	public BufferedNetworkStackClient() {
-		buf = ByteBuffer.allocate(1024);
+		buf = ByteBuffer.allocate(BUF_SIZE);
 	}
 
 	public void push(String s, String host, int port) throws IOException {
@@ -35,7 +37,7 @@ public class BufferedNetworkStackClient {
 		channel.send(buf, dest);
 
 		buf.flip();
-		buf.clear();
+		buf = ByteBuffer.allocate(BUF_SIZE);
 		channel.receive(buf);
 
 		byte[] receivedData = buf.array();
@@ -74,6 +76,7 @@ public class BufferedNetworkStackClient {
 
 			try {
 				channel.send(buf, dest);
+				buf.clear();
 			} catch (IOException e) {
 				e.printStackTrace();
 			}