From bc6b9d1563640ae77417cb4a90c831180e507fee Mon Sep 17 00:00:00 2001
From: senft-lap <senftt@gmail.com>
Date: Fri, 9 Nov 2012 22:28:30 +0100
Subject: [PATCH] Created a ListenThread

---
 .../src/server/BufferedNetworkStack.java      | 207 ++++++++++--------
 1 file changed, 119 insertions(+), 88 deletions(-)

diff --git a/ws2012/P2P/uebungen/2/p2p_ex2/src/server/BufferedNetworkStack.java b/ws2012/P2P/uebungen/2/p2p_ex2/src/server/BufferedNetworkStack.java
index 983e6a3b..0a998be0 100644
--- a/ws2012/P2P/uebungen/2/p2p_ex2/src/server/BufferedNetworkStack.java
+++ b/ws2012/P2P/uebungen/2/p2p_ex2/src/server/BufferedNetworkStack.java
@@ -14,13 +14,17 @@ import common.MessageType;
 class BufferedNetworkStack {
 
 	private DatagramChannel channel;
+	private ByteBuffer buf;
 
 	protected static final int BUF_SIZE = 10;
+	protected static final int BUF_SIZE = 1024;
 
 	private Stack<String> stack;
 
 	private ArrayList<Element> temp;
 
+	private ListenThread listenThread;
+
 	public BufferedNetworkStack(final int port) throws IOException {
 
 		stack = new Stack<String>();
@@ -29,95 +33,10 @@ class BufferedNetworkStack {
 		channel = DatagramChannel.open();
 		channel.socket().bind(new InetSocketAddress(port));
 
-		StringBuilder received;
+		buf = ByteBuffer.allocate(BUF_SIZE);
 
-		ByteBuffer buf = ByteBuffer.allocate(BUF_SIZE);
-		buf.clear();
-
-		while (true) {
-			// write stuff from channel to buffer
-			SocketAddress client = channel.receive(buf);
-
-			// make buffer readable
-			buf.flip();
-
-			byte messageType = buf.get();
-
-			switch (messageType) {
-			case MessageType.CMD_PUSH:
-				int size = buf.getInt();
-
-				int id = temp.size();
-				temp.add(id, new Element(size, id));
-
-				buf.flip();
-				buf.clear();
-
-				buf.putInt(BUF_SIZE);
-				buf.putInt(id);
-				buf.flip();
-				channel.send(buf, client);
-				break;
-
-			case MessageType.CMD_DATA:
-				int sessionId = buf.getInt();
-				int chunkId = buf.getInt();
-
-				received = new StringBuilder();
-				while (buf.hasRemaining()) {
-					received.append((char) buf.get());
-				}
-
-				// System.out.println("Received chunk #" + chunkId +
-				// " of data #"
-				// + sessionId + ": " + received);
-
-				for (Element e : temp) {
-					if (e.id == sessionId) {
-						e.chunks[chunkId] = received.toString();
-
-						if (e.isComplete()) {
-							temp.remove(e);
-							stack.add(e.toString());
-						}
-						break;
-					}
-				}
-				break;
-
-			case MessageType.CMD_POP:
-				try {
-					String popped = stack.pop();
-					send(popped, client);
-					System.out.println("Pop " + popped);
-
-				} catch (EmptyStackException e) {
-					System.out.println("Received pop but stack is empty");
-				}
-				break;
-
-			case MessageType.CMD_PRINT:
-				System.out.println(toString());
-				break;
-
-			default:
-				received = new StringBuilder();
-				while (buf.hasRemaining()) {
-					int b = buf.get();
-					received.append((char) b);
-					System.out.println("Received " + (char) b);
-				}
-
-				System.out.println("Received unknown command: " + "["
-						+ received.toString() + "]");
-				break;
-
-			}
-
-			// clear buffer and make it ready to write
-			buf = ByteBuffer.allocate(BUF_SIZE);
-			// buf.clear();
-		}
+		listenThread = new ListenThread();
+		listenThread.start();
 	}
 
 	public String toString() {
@@ -131,13 +50,125 @@ class BufferedNetworkStack {
 	}
 
 	private void send(String text, SocketAddress client) {
+	public void stop() {
+		listenThread.setStopping();
+
 		try {
 			channel.send(ByteBuffer.wrap(text.getBytes()), client);
+			channel.close();
 		} catch (IOException e) {
 			e.printStackTrace();
 		}
 	}
 
+	private class ListenThread extends Thread {
+		private boolean running = false;
+
+		public void run() {
+			running = true;
+			StringBuilder received;
+			SocketAddress client = null;
+
+			while (running) {
+				// write stuff from channel to buffer
+				try {
+					client = channel.receive(buf);
+				} catch (IOException e1) {
+					e1.printStackTrace();
+				}
+
+				// make buffer readable
+				buf.flip();
+
+				byte messageType = buf.get();
+
+				switch (messageType) {
+				case MessageType.CMD_PUSH:
+					int size = buf.getInt();
+
+					int id = temp.size();
+					temp.add(id, new Element(size, id));
+
+					buf.flip();
+					buf.clear();
+
+					buf.putInt(BUF_SIZE);
+					buf.putInt(id);
+					buf.flip();
+					try {
+						channel.send(buf, client);
+					} catch (IOException e1) {
+						// TODO Auto-generated catch block
+						e1.printStackTrace();
+					}
+					break;
+
+				case MessageType.CMD_DATA:
+					int sessionId = buf.getInt();
+					int chunkId = buf.getInt();
+
+					received = new StringBuilder();
+					while (buf.hasRemaining()) {
+						received.append((char) buf.get());
+					}
+
+					// System.out.println("Received chunk #" + chunkId +
+					// " of data #"
+					// + sessionId + ": " + received);
+
+					for (Element e : temp) {
+						if (e.id == sessionId) {
+							e.chunks[chunkId] = received.toString();
+
+							if (e.isComplete()) {
+								temp.remove(e);
+								stack.add(e.toString());
+							}
+							break;
+						}
+					}
+					break;
+
+				case MessageType.CMD_POP:
+					try {
+						String popped = stack.pop();
+						send(popped, client);
+						System.out.println("Pop " + popped);
+
+					} catch (EmptyStackException e) {
+						System.out.println("Received pop but stack is empty");
+					}
+					break;
+
+				case MessageType.CMD_PRINT:
+					System.out.println(toString());
+					break;
+
+				default:
+					received = new StringBuilder();
+					while (buf.hasRemaining()) {
+						int b = buf.get();
+						received.append((char) b);
+						System.out.println("Received " + (char) b);
+					}
+
+					System.out.println("Received unknown command: " + "["
+							+ received.toString() + "]");
+					break;
+
+				}
+
+				// clear buffer and make it ready to write
+				buf = ByteBuffer.allocate(BUF_SIZE);
+				// buf.clear();
+			}
+		}
+
+		public void setStopping() {
+			running = false;
+		}
+	}
+
 	public static void main(String args[]) {
 		try {
 			new BufferedNetworkStack(9999);