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Modularize Your Code!

Modularize Your Code!. Modularization. Separation of application and protocol layer is extremely helpful for: Extension of application or protocol independently (e.g ., not rebuilding from scratch for projects 2 and 3) Writing clearer code that is easier to debug

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Modularize Your Code!

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  1. Modularize Your Code!

  2. Modularization • Separation of application and protocol layer is extremely helpful for: • Extension of application or protocol independently (e.g., not rebuilding from scratch for projects 2 and 3) • Writing clearer code that is easier to debug • Easier thread organization: • 1 or 2 for I/O per socket, probably • any number for app

  3. Modularization in Java • Force yourself to separate app and protocol • Use separate packages! • Example of one way to do this:

  4. App package App; public class App { Helper helper; booleannewData; Object[] data; public App(){ newData = false; helper = new Helper(“128.208.6.43”, 9999, this); helper.start(); mainLoop(); } … } Protocol package Protocol; public class Helper implements Runnable{ Socket socket; BufferedInputStream input; BufferedOutputStream output; public Helper(String ip, int port, App app){ this.app = app; socket = new Socket(ip, port); input = new BufferedInputStream(socket.getInputStream()); output = new BufferedOutputStream(socket.getOutputStream()); } … }

  5. Protocol public void run() { while (true){ try { intbytesAvailable = input.available(); if (bytesAvailable > 0){ byte[] buffer = new byte[bytesAvailable]; input.read(buffer); processRead(buffer); } … } public void processRead(byte[] buffer){ // TODO: translate buffer into objects this.app.dataWasRead(objects); } App public void dataWasRead(Object[] objs){ data = objs; newData = true; } public void mainLoop(){ while (true){ if (newData){ doThings(data); newData = false; } } }

  6. Abstracting An Example • Email • How should we separate protocol and application layers for an email client?

  7. Abstracting An Example • If we properly separate application and protocol, does either one affect the other? • Could we implement email using HTTP as its protocol instead of SMTP? • Should we?

  8. Note for Project 1 • Client should automatically re-register before the time runs out: Timer timer = new Timer(); timer.schedule(new TimerTask(){ @override public void run(){ reregister(); } }, timeout - 1000);

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