project1-2

project1-2 - Project 1 A test driven perspec1ve Test driven...

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Unformatted text preview: Project 1 A test driven perspec1ve Test driven development Your program is good enough if it passed all tests Usually this is done by using automated test system Although you can use [email protected] tests as well Give you a [email protected] idea what you program should do before start to program Test driven development Incrementally develop your program You can have different way to incrementally program Example start with a top down approach Which means step 1: Starts with a server and a client They run Step 1 test Server test code public static void main(String args) { } SipServer server = new SipServer(); server.start(); Client Test code public static void main(String args) { } SipClient server = new SipClient(); SipClient.start(); Step 1 fix Implementa1on is trivia Everyone knows how to create class and objects. Right? Step 2 test Client should be the one that ini1ate a communica1on (C/S model) public static void main(String args) { } SipClient server = new SipClient(); SipClient.send(); TEST: the client should send a string through UDP Step 2 fix UDP: datagram socket programming Create a client socket, create a packet, send Fix: what's the IP address you are sending to? Get IP of the host machine: ipconfig/ifconfig Create InetAddress from IP string Fix: How to convert String to byte array? Side note: character encoding Please use ISO-8859-1 for this project. // Create the encoder and decoder for ISO-8859-1 Charset charset = Charset.forName("ISO-8859-1"); CharsetDecoder decoder = charset.newDecoder(); CharsetEncoder encoder = charset.newEncoder(); try { // Convert a string to ISO-LATIN-1 bytes in a ByteBuffer // The new ByteBuffer is ready to be read. ByteBuffer bbuf = encoder.encode(CharBuffer.wrap("a string")); // Convert ISO-LATIN-1 bytes in a ByteBuffer to a character // ByteBuffer and then to a string. // The new ByteBuffer is ready to be read. CharBuffer cbuf = decoder.decode(bbuf); String s = cbuf.toString(); } catch (CharacterCodingException e) { } } Step 2 fix Fix: How to handle excep1ons? Try... catch... finally try { clientSocket = new DatagramSocket(); socket.send(); } catch (SocketException e) { e.printStackTrace(); } finally{ socket.close(); } Throw Handle all expected excep1ons gracefully Step 2 fix DatagramSocket clientSocket; try { clientSocket = new DatagramSocket(); byte sendData = msg.getBytes(); InetAddress IPAddress; IPAddress = InetAddress.getByName(ip); DatagramPacket sendPacket = new DatagramPacket(...); clientSocket.send(sendPacket); } catch { } Step 3 test Test: s1ll fails, sending data is not received. Create the server For tes1ng purpose, create a logging func1on you find convenient. Print out the received data (decoded) Step 3 fix while (this.isRunning) { int bufsize = sock.getReceiveBufferSize(); byte message = new byte[bufsize]; DatagramPacket packet = new DatagramPacket(message, bufsize); sock.receive(packet); String receivedString = new String(packet.getData()); //System.out.println(receivedString); } Step 4 TEST: Client send a client id with the message Whenever server got a message, print out all the history message from the same client (same id) Step 5 test Server test code public static void main(String args) { } SipStack stack1= new SipStack(); stack1.start(); Client Test code public static void main(String args) { } SipStack stack2= new SipStack (); stack2.start(); stack2.send(whatever); Step 5 fix The server is a while(true) loop, remember?How to handle send code when you program is looping? Threading : put server code in a separate thread. Keep your class structure! Add more class. public class ServerThread implements Runnable { } public void run() { while (this.isRunning) { } } Step 6 TEST: Let's do the SIP protocol. Client send test messages, server should responds with correct answer. FIX: state machine. Same state machine code, keep a state for each dialog . State classes for each state? Or state field in each dialog class? Abstract class State{ Abstract void Run();} Init_state extends State{ Void run(){ Process incoming messages} } Class SipStack{ State current_state;} Step 7 Test: SipListener interface SipStack hold a SipLisener reference Fix: The interface code is trivia. Call the SipListener.handleSession The actual interface is up to you. Side note: observer [email protected] Step 8 TEST: user program SipApp(){ serverStack = new ServerStack(selfPort); serverStack .addListener(this); serverStack .start(); } FIX: now complete your tes1ng program with all kinds of scenarios. Create a test mode/app, let you see the current state, manually send messages. ...
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This note was uploaded on 03/24/2011 for the course ECS 152a taught by Professor Ghoshal during the Fall '08 term at UC Davis.

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