[CT414]: Add Assignment 1 progress

year4/semester2/CT414/assignments/assignment1/code/src/client/ApplicationClient.java

@@ -0,0 +1,61 @@
+package client;
+
+import interfaces.ApplicationForm;
+import interfaces.ApplicationHandler;
+
+import java.rmi.registry.LocateRegistry;
+import java.rmi.registry.Registry;
+import java.util.Scanner;
+
+public class ApplicationClient {
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+
+        try {
+            // connect to registry
+            Registry registry = LocateRegistry.getRegistry("localhost", 1099);
+            System.out.println("Connected to RMI Registry");
+
+            // look up application handler in registry
+            ApplicationHandler handler = (ApplicationHandler) registry.lookup("ApplicationHandler");
+            System.out.println("ApplicationHandler found in registry");
+
+            // login
+            System.out.println("Enter your username\n> ");
+            String username = scanner.nextLine();
+
+            System.out.println("Enter your password\n> ");
+            String password = scanner.nextLine();
+
+            long sessionID = handler.login(username, password);
+            System.out.println("Successfully logged in with session ID: " + sessionID);
+
+            // download application form
+            ApplicationForm form = handler.downloadApplicationForm(sessionID);
+            System.out.println("Successfully downloaded application form");
+
+            // print form info
+            System.out.println("------ FORM INFORMATION ------");
+            System.out.println(form.getFormInfo());
+            System.out.println("Number of questions to be answered: " + form.getTotalQuestions());
+            System.out.println("------------------------------");
+
+            // answer questiosn
+            for (int i = 0; i < form.getTotalQuestions(); i++) {
+                System.out.println("Q" + i + ": " + form.getQuestion(i));
+                System.out.println("A> ");
+                form.answerQuestion(i, scanner.nextLine());
+            }
+            System.out.println("Form filled successfully.");
+
+            // submit form
+            handler.submitApplicationForm(sessionID, form);
+            System.out.println("Successfully submitted application form.");
+
+        } catch (Exception e) {
+            e.printStackTrace();
+        } finally {
+            scanner.close();
+        }
+    }
+}

year4/semester2/CT414/assignments/assignment1/code/src/implementations/ApplicationFormV1.java

@@ -43,6 +43,11 @@ public class ApplicationFormV1 implements ApplicationForm {
         answers[questionNumber] = answer;
     }
 
+    @Override
+    public String getName() throws RemoteException {
+        return answers[0];
+    }
+
     @Override
     public String toString() {
         StringBuilder sb = new StringBuilder();

year4/semester2/CT414/assignments/assignment1/code/src/implementations/ApplicationHandlerImpl.java

@@ -0,0 +1,55 @@
+package implementations;
+import exceptions.InvalidCredentialsException;
+import exceptions.InvalidSessionIDException;
+import interfaces.*;
+
+import java.rmi.RemoteException;
+import java.util.ArrayList;
+import java.io.*;
+
+public class ApplicationHandlerImpl implements ApplicationHandler {
+    private ArrayList<Long> sessions = new ArrayList<Long>();
+
+    @Override
+    public long login(String username, String password) throws RemoteException, InvalidCredentialsException {
+        // hardcoded username and password (great practice for security)
+        if (username.equals("admin") && password.equals("admin")) {
+            long sessionId = System.currentTimeMillis(); // use current time as session id
+            sessions.add(sessionId);
+
+            System.out.println("User " + username + " logged in with session ID: " + sessionId);
+
+            return sessionId;
+        } else {
+            throw new InvalidCredentialsException("Invalid username or password.");
+        }
+    }
+
+    @Override
+    public ApplicationForm downloadApplicationForm(long sessionID) throws RemoteException, InvalidSessionIDException {
+        if (sessions.contains(sessionID)) {
+            System.out.println("Returning application form for session ID: " + sessionID);
+            return new ApplicationFormV1();
+        } else {
+            throw new InvalidSessionIDException("Invalid session ID.");
+        }
+    }
+
+    @Override
+    public void submitApplicationForm(long sessionID, ApplicationForm applicationForm) throws RemoteException, InvalidSessionIDException {
+        if (sessions.contains(sessionID)) {
+            String filename = applicationForm.getName().replace("\\s", "_") + ".txt";
+
+            try (BufferedWriter writer = new BufferedWriter(new FileWriter(filename))) {
+                System.out.println("Saving application form to file: " + filename);
+                writer.write(applicationForm.toString());
+                System.out.println("Successfully saved application form to file: " + filename);
+            } catch (IOException e) {
+                System.out.println("Failed to save application form to file:" + filename);
+                e.printStackTrace();
+            }
+        } else {
+            throw new InvalidSessionIDException("Invalid session ID.");
+        }
+    }
+}

year4/semester2/CT414/assignments/assignment1/code/src/interfaces/ApplicationForm.java

@@ -15,4 +15,7 @@ public interface ApplicationForm extends Remote {
 
      // method to provide a String answer to a question based off its questionNumber
     void answerQuestion(int questionNumber, String answer) throws RemoteException, IllegalArgumentException;
+
+    // method to return the applicant's name, for use in naming application files
+    String getName() throws RemoteException;
 }

year4/semester2/CT414/assignments/assignment1/code/src/run.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+src_path="/home/andrew/edu/year4/semester2/CT414/assignments/assignment1/code/src"
+
+# compile code
+javac -d . server/*.java client/*.java interfaces/*.java implementations/*.java                                                                                                                                             
+
+# start rmi registry
+rmiregistry -J-Djava.rmi.server.codebase=file:$src_path &
+trap "kill $! 2>/dev/null" EXIT
+
+# start server
+java -cp $src_path -Djava.rmi.server.codebase=file:$src_path/ server.ApplicationServer &
+trap "kill $! 2>/dev/null" EXIT

year4/semester2/CT414/assignments/assignment1/code/src/server/ApplicationServer.java

@@ -0,0 +1,31 @@
+package server;
+
+import implementations.ApplicationHandlerImpl;
+
+import java.rmi.Naming;
+import java.rmi.registry.LocateRegistry;
+import java.rmi.registry.Registry;
+import java.rmi.server.UnicastRemoteObject;
+
+public class ApplicationServer {
+    public static void main(String[] args) {
+        try {
+            // start RMI registry
+            Registry registry = LocateRegistry.getRegistry();
+
+            // create applicationhandlerstub and bind it
+            ApplicationHandlerImpl applicationHandler = new ApplicationHandlerImpl();
+            System.out.println("Instance of ApplicationHandlerImpl created");
+
+            ApplicationHandlerImpl stub = (ApplicationHandlerImpl) UnicastRemoteObject.exportObject(applicationHandler, 0);
+            Naming.rebind("ApplicationHandler", stub);
+            System.out.println("Name rebind completed");
+
+            System.out.println("Application Server up and running");
+        }
+        catch (Exception e) {
+            System.out.println("Failed to start server");
+            e.printStackTrace();
+        }
+    }
+}