diff --git a/assignments/src/MV3500Cohort2024JulySeptember/homework2/Lennon/LennonHW2Client.java b/assignments/src/MV3500Cohort2024JulySeptember/homework2/Lennon/LennonHW2Client.java
new file mode 100644
index 0000000000000000000000000000000000000000..0b1f881a1032bf3d2a44c6f8cda1e23328e7b164
--- /dev/null
+++ b/assignments/src/MV3500Cohort2024JulySeptember/homework2/Lennon/LennonHW2Client.java
@@ -0,0 +1,99 @@
+package MV3500Cohort2024JulySeptember.homework2.Lennon;
+
+import TcpExamples.TcpExample3Client;
+import TcpExamples.TcpExample4DispatchServer;
+import TcpExamples.TcpExample4HandlerThread;
+import java.io.*;
+import java.net.*;
+import java.util.Scanner;
+//import java.time.LocalTime; // conversion?
+
+/**
+ * This client program establishes a socket connection to the {@link TcpExample4DispatchServer},
+ * then checks how long it takes to read the single line it expects as a server response.
+ * No fancy footwork here, it is pretty simple and similar to {@link 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>
+ *
+ * @author Don McGregor
+ * @author Don Brutzman
+ * @author MV3500 class
+ */
+public class LennonHW2Client
+{
+ /** Default constructor */
+ public LennonHW2Client()
+ {
+
+ // 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 {
+ boolean play;
+ System.out.println(LennonHW2Client.class.getName() + " start, loop " + MAX_LOOP_COUNT + " times");
+ System.out.println("=======================================================");
+ //for (int loopCount = 1; loopCount <= MAX_LOOP_COUNT; loopCount++) // loop then exit
+ do{
+ System.out.println(LennonHW2Client.class.getName() + " creating new socket ...");
+
+ // We request an IP to connect to ("localhost") and
+ // port number at that IP (2317). This establishes
+ // a connection to that IP in the form of the Socket
+ // object; the server uses a ServerSocket to wait for
+ // connections.This particualar example is interacting
+ // with what it expects is a server that writes a single text
+ // line after 10 sec.
+ long startTime = System.currentTimeMillis();
+
+ // open a socket for each loop
+ Socket socket = new Socket(DESTINATION_HOST, 2317);
+
+ // Setup. Read the single line written by the server.
+ // We'd do things a bit differently if many lines to be read
+ // from the server, instead of one only.
+ InputStream is = socket.getInputStream();
+ Reader isr = new InputStreamReader(is);
+ BufferedReader br = new BufferedReader(isr);
+
+ String serverMessage = br.readLine(); // blocks
+ long readTime = System.currentTimeMillis();
+ long timeLength = readTime - startTime;
+
+ System.out.println(LennonHW2Client.class.getName() + ": message received from server='" + serverMessage + "'");
+ System.out.println(LennonHW2Client.class.getName() + ": time msec required for read=" + timeLength);
+ System.out.println("=======================================================");
+ // To push this further, launch multiple copies of TcpExample4Client simultaneously
+ System.out.println("Want to go again? Y/N");
+ String response = "";
+ //response = scanner.nextLine();
+ if ("Y".equals(response.toUpperCase().charAt(0))){
+ play = true;
+ }
+ else{
+ play = false;
+ }
+ }while(play);
+ System.out.println(LennonHW2Client.class.getName() + " complete");
+ // main method now exits
+ } catch (IOException e) {
+ System.out.println("Problem with " + LennonHW2Client.class.getName() + " networking: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!");
+ }
+ }
+ }
+}
diff --git a/assignments/src/MV3500Cohort2024JulySeptember/homework2/Lennon/LennonHW2DispatchServer.java b/assignments/src/MV3500Cohort2024JulySeptember/homework2/Lennon/LennonHW2DispatchServer.java
new file mode 100644
index 0000000000000000000000000000000000000000..4e30d61d856dda68a310bddee84d041f1d3ec33c
--- /dev/null
+++ b/assignments/src/MV3500Cohort2024JulySeptember/homework2/Lennon/LennonHW2DispatchServer.java
@@ -0,0 +1,75 @@
+package MV3500Cohort2024JulySeptember.homework2.Lennon;
+
+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 LennonHW2HandlerThread
+ *
+ * @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 LennonHW2DispatchServer
+{
+ /** Default constructor */
+ public LennonHW2DispatchServer()
+ {
+ // default constructor
+ }
+ /**
+ * Program invocation, execution starts here
+ * @param args command-line arguments
+ */
+ public static void main(String[] args)
+ {
+ try {
+ ServerSocket serverSocket = new ServerSocket(2317);
+ Socket clientConnectionSocket;
+ LennonHW2HandlerThread handlerThread;
+
+ int connectionCount = 0; // state variable
+
+ System.out.println(LennonHW2DispatchServer.class.getName() + " ready to accept socket connections...");
+ while (true) // infinite loop
+ {
+ clientConnectionSocket = serverSocket.accept(); // block! until connected
+
+ connectionCount++; // unblocked, got another connection
+
+ // TODO option for the student, provide initial message *to the client*
+ // that we are handing off to a dispatch thread... because that is polite behavior.
+ // Plenty of code in Example3, we instead let our proxy thread
+ // TcpExample4HandlerThread introduce itself to the client.
+
+ System.out.println("=============================================================");
+ System.out.println(LennonHW2DispatchServer.class.getName() + ".handlerThread created for connection #" + connectionCount + "...");
+
+ // hand off this aready-created and connected socket to constructor
+ handlerThread = new LennonHW2HandlerThread(clientConnectionSocket);
+ handlerThread.start();// invokes the run() method in that object
+ System.out.println(LennonHW2DispatchServer.class.getName() + ".handlerThread is now dispatched and running, using most recent connection...");
+
+ // while(true) continue looping, serverSocket is still waiting for another customer client
+ }
+ }
+ catch (IOException e) {
+ System.out.println("Problem with " + LennonHW2DispatchServer.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("============================================================="); // execution complete
+ }
+}
diff --git a/assignments/src/MV3500Cohort2024JulySeptember/homework2/Lennon/LennonHW2HandlerThread.java b/assignments/src/MV3500Cohort2024JulySeptember/homework2/Lennon/LennonHW2HandlerThread.java
new file mode 100644
index 0000000000000000000000000000000000000000..6105573440f9c83e11ce535c1e9934112306466f
--- /dev/null
+++ b/assignments/src/MV3500Cohort2024JulySeptember/homework2/Lennon/LennonHW2HandlerThread.java
@@ -0,0 +1,91 @@
+package MV3500Cohort2024JulySeptember.homework2.Lennon;
+
+import java.io.*;
+import java.net.*;
+
+/**
+ * <p>
+ * This utility class supports the {@link 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 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 LennonHW2HandlerThread 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
+ */
+ LennonHW2HandlerThread(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(LennonHW2HandlerThread.class.getName() + " starting to handle a thread...");
+
+ // get the connection output stream, then wait a period of time.
+ OutputStream os = socket.getOutputStream();
+ PrintStream ps = new PrintStream(os);
+
+ final long TIMEOUT = 2000; // 2000 milliseconds = 2 seconds, 10000 milliseconds = 10 seconds
+ System.out.println(LennonHW2HandlerThread.class.getName() + " pausing for TIMEOUT=" + TIMEOUT + "ms" +
+ " to emulate computation and avoid server-side overload");
+ Thread.sleep(TIMEOUT);
+
+ // ps is the PrintStream is the Java way to use System.print() to pass data along the socket.
+ ps.println("This message was written by the server " + LennonHW2HandlerThread.class.getName()); // TODO insert socket count here!
+ ps.flush(); // make sure that it indeed escapes current process and reaches the client
+ socket.close(); // all clear, no longer need socket
+ System.out.println(LennonHW2HandlerThread.class.getName() + " finished handling a thread, now exit.");
+ }
+ catch(IOException | InterruptedException e) // either a networking or a threading problem
+ {
+ System.out.println("Problem with " + LennonHW2HandlerThread.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!");
+ }
+ }
+}