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assignments/src/MV3500Cohort2024JulySeptember/homework2/Matiski/Matiski2Client.java

+package MV3500Cohort2024JulySeptember.homework2.Matiski;
+
+import java.io.*;
+import java.net.*;
+
+/**
+ * This client program establishes a socket connection to the {@link TcpExamples.TcpExample4DispatchServer},
+ * then checks how long it takes to read the single line it expects as a server response.
+ * The modification I have added is it checks for a password from the server.  And it matches it says success and disconnects
+ * No fancy footwork here, it is pretty simple and similar to {@link TcpExamples.TcpExample3Client}.
+ * 
+ * @see TcpExample4DispatchServer
+ * @see TcpExample4HandlerThread
+ *
+ * @see <a href="../../../src/TcpExamples/TcpExample4TerminalLog.txt" target="blank">TcpExample4TerminalLog.txt</a>
+ * @see <a href="../../../src/TcpExamples/TcpExample4SequenceDiagram.png" target="blank">TcpExample4SequenceDiagram.png</a>
+ * @see <a href="../../../src/TcpExamples/TcpExample4SequenceSketch.png" target="blank">TcpExample4SequenceSketch.png</a>
+ * credit to the following for providing the class example that I modified
+ * @author Don McGregor
+ * @author Don Brutzman
+ * @author MV3500 class
+ * @MarkMM
+ */
+public class Matiski2Client
+{
+    /** Default constructor */
+    public Matiski2Client()
+    {
+        // default constructor
+    }
+    static String DESTINATION_HOST = "localhost";
+    static int    MAX_LOOP_COUNT   = 4;
+
+    /**
+     * Program invocation, execution starts here
+     * @param args command-line arguments
+     */
+    public static void main(String[] args) {
+        try {
+            System.out.println(Matiski2Client.class.getName() + " start, loop " + MAX_LOOP_COUNT + " times");
+            System.out.println("=======================================================");
+            for (int loopCount = 1; loopCount <= MAX_LOOP_COUNT; loopCount++) // loop then exit
+            {
+                System.out.println(Matiski2Client.class.getName() + " creating new socket #" + loopCount + "...");
+
+                long startTime = System.currentTimeMillis();
+
+                // Open a socket for each loop
+                Socket socket = new Socket(DESTINATION_HOST, 2317); 
+                // Note our local port on this client host is not specified - because 
+                // that doesn't matter.  It is an "ephemeral" port on localhost.
+
+                // Setup. Read the prompt from the server.
+                InputStream is = socket.getInputStream();
+                Reader isr = new InputStreamReader(is);
+                BufferedReader br = new BufferedReader(isr);
+
+                OutputStream os = socket.getOutputStream();
+                PrintStream ps = new PrintStream(os);
+
+                // Read server prompt for password
+                String serverPrompt = br.readLine(); 
+                System.out.println(serverPrompt); // Should print "Enter password:"
+
+                // Send the password
+                String password = "Mark"; // Replace with your password
+                ps.println(password);
+                ps.flush();
+
+                // Read server response
+                String serverResponse = br.readLine(); 
+                System.out.println(serverResponse);
+
+                if ("Password accepted. Processing your request...".equals(serverResponse)) {
+                    // Read the actual message from the server
+                    String serverMessage = br.readLine(); 
+                    long readTime = System.currentTimeMillis();
+                    long timeLength = readTime - startTime;
+
+                    System.out.println(Matiski2Client.class.getName() + ": message received from server='" + serverMessage + "'");
+                    System.out.println(Matiski2Client.class.getName() + ": time msec required for read=" + timeLength);
+                }
+
+                System.out.println("=======================================================");
+                socket.close(); // Close the socket after the interaction
+            }
+            System.out.println(Matiski2Client.class.getName() + " complete");
+            // main method now exits
+        } catch (IOException e) {
+            System.out.println("Problem with " + Matiski2Client.class.getName() + " networking:"); // describe what is happening
+            System.out.println("Error: " + e);
+            // Provide more helpful information to user if exception occurs due to running twice at one time
+            if (e instanceof java.net.BindException) {
+                System.out.println("*** Be sure to stop any other running instances of programs using this port!");
+            }
+            else if (e instanceof java.net.ConnectException) 
+            {
+                System.out.println("*** Be sure to start the server before starting the client!");
+            }
+        }
+    }
+}
\ No newline at end of file

assignments/src/MV3500Cohort2024JulySeptember/homework2/Matiski/Matiski2HandlerThread.java

+package MV3500Cohort2024JulySeptember.homework2.Matiski;
+
+import java.io.*;
+import java.net.*;
+
+/**
+ * <p>
+ * This utility class supports the {@link TcpExamples.TcpExample4DispatchServer} program,
+ * handling all programming logic needed for a new socket connection
+ * to run in a thread of its own. This is the server
+ * portion as well, so we artificially invent what happens
+ * if the server can't respond to a connection for several seconds.
+ * </p>
+ * <p>
+ * Warning: do not run this class!  It is created and used automatically by {@link TcpExamples.TcpExample4DispatchServer} at run time.
+ * </p>
+ * 
+ * @see TcpExample4Client
+ * @see TcpExample4DispatchServer
+ *
+ * @see <a href="../../../src/TcpExamples/TcpExample4TerminalLog.txt" target="blank">TcpExample4TerminalLog.txt</a>
+ * @see <a href="../../../src/TcpExamples/TcpExample4SequenceDiagram.png" target="blank">TcpExample4SequenceDiagram.png</a>
+ * @see <a href="../../../src/TcpExamples/TcpExample4SequenceSketch.png" target="blank">TcpExample4SequenceSketch.png</a>
+ * 
+ * @author Don McGregor
+ * @author Don Brutzman
+ * @author MV3500 class
+ */
+public class Matiski2HandlerThread extends Thread
+{
+    /** The socket connection to a client */
+    Socket socket;
+    
+    /** 
+     * The thread constructor creates the socket from a ServerSocket, waiting for the client to connect,
+     * and passes that socket when constructing the thread responsible for handling the connection.
+     * 
+     * @param socket The socket connection handled by this thread
+     */
+    Matiski2HandlerThread(Socket socket)
+    {
+        this.socket = socket;
+    }
+    /**
+     * Program invocation and execution starts here - but is illegal and unwanted, so warn the unsuspecting user!
+     * @param args command-line arguments
+     */
+    public static void main(String[] args)
+    {
+        System.out.println ("*** TcpExample4HandlerThread is not a standalone executable progam.");
+        System.out.println ("*** Please run TcpExample4DispatchServer instead... now exiting.");
+    }
+    
+    /** Handles one connection. We add an artificial slowness
+     * to handling the connection with a sleep(). This means
+     * the client won't see a server connection response for ten seconds (default).
+     */
+    // @overriding run() method in Java Thread class is deliberate
+    @Override 
+public void run()
+{
+    try
+    {
+        System.out.println(Matiski2HandlerThread.class.getName() + " starting to handle a thread...");
+
+        // Set up input and output streams for communication
+        InputStream is = socket.getInputStream();
+        Reader isr = new InputStreamReader(is);
+        BufferedReader br = new BufferedReader(isr);
+
+        OutputStream os = socket.getOutputStream();
+        PrintStream ps = new PrintStream(os);
+
+        // Ask for password
+        final String correctPassword = "Mark"; 
+        ps.println("Enter password:"); 
+        ps.flush();
+
+        String clientPassword = br.readLine(); // Read the password sent by the client
+
+        if (correctPassword.equals(clientPassword)) {
+            ps.println("Password accepted. Processing your request...");
+            ps.flush();
+
+            final long TIMEOUT = 2000; // 2000 milliseconds = 2 seconds
+            System.out.println(Matiski2HandlerThread.class.getName() + " pausing for TIMEOUT=" + TIMEOUT + "ms" + 
+                               " to emulate computation and avoid server-side overload"); 
+            Thread.sleep(TIMEOUT);
+
+            // Continue with the original logic
+            ps.println("This message was written by the server " + Matiski2HandlerThread.class.getName()); 
+            ps.flush();
+        } else {
+            ps.println("Incorrect password. Connection will be terminated.");
+            ps.flush();
+        }
+
+        socket.close(); // Close the socket after handling the connection
+        System.out.println(Matiski2HandlerThread.class.getName() + " finished handling a thread, now exit.");
+    }
+    catch(IOException | InterruptedException e) 
+    {
+        System.out.println("Problem with " + Matiski2HandlerThread.class.getName() + " networking:"); 
+        System.out.println("Error: " + e);
+        
+        if (e instanceof java.net.BindException)
+            System.out.println("*** Be sure to stop any other running instances of programs using this port!");
+    }
+}
+}

assignments/src/MV3500Cohort2024JulySeptember/homework2/Matiski/Matiski2Server.java

+package MV3500Cohort2024JulySeptember.homework2.Matiski;
+
+import java.io.IOException;
+import java.net.*;
+
+/**
+ * This server program works a bit differently by creating and dispatching a
+ * new thread to handle multiple incoming socket connections, one after another, all running in parallel.
+ * This advanced technique is often used in high=performance high=capacity server programs.
+ * 
+ * 
+ * @see TcpExample4Client
+ * @see Matiski2HandlerThread
+ *
+ * @see <a href="../../../src/TcpExamples/TcpExample4TerminalLog.txt" target="blank">TcpExample4TerminalLog.txt</a>
+ * @see <a href="../../../src/TcpExamples/TcpExample4SequenceDiagram.png" target="blank">TcpExample4SequenceDiagram.png</a>
+ * @see <a href="../../../src/TcpExamples/TcpExample4SequenceSketch.png" target="blank">TcpExample4SequenceSketch.png</a>
+ *
+ * @author Don McGregor
+ * @author Don Brutzman
+ * @author MV3500 class
+ */
+public class Matiski2Server
+{
+    /** Default constructor */
+    public Matiski2Server()
+    {
+        // default constructor
+    }
+    /**
+     * Program invocation, execution starts here
+     * @param args command-line arguments
+     */
+    public static void main(String[] args)
+    {
+        try {
+            ServerSocket serverSocket = new ServerSocket(2317);
+            Matiski2HandlerThread handlerThread;
+            Socket clientConnection;
+
+            int connectionCount = 0; // state variable
+
+            System.out.println(Matiski2Server.class.getName() + " ready to accept socket connections...");
+            while (true) // infinite loop
+            {
+                clientConnection = serverSocket.accept(); // block until connected
+
+                connectionCount++; // unblocked, got another connection
+                System.out.println("=============================================================");
+                System.out.println(Matiski2Server.class.getName() + ".handlerThread invocation for connection #" + connectionCount + "...");
+                handlerThread = new Matiski2HandlerThread(clientConnection);
+                handlerThread.start(); // invokes the run() method in that object
+                System.out.println(Matiski2Server.class.getName() + ".handlerThread is launched, awaiting another connection...");
+            }
+        } catch (IOException e) {
+            System.out.println("Problem with " + Matiski2Server.class.getName() + " networking:"); // describe what is happening
+            System.out.println("Error: " + e);
+            // Provide more helpful information to user if exception occurs due to running twice at one time
+            if (e instanceof java.net.BindException) {
+                System.out.println("*** Be sure to stop any other running instances of programs using this port!");
+            }
+        }
+        System.out.println("=============================================================");
+    }
+}