From 411f42ed4ca4fb0bb8f1204093d0899d4ae5c131 Mon Sep 17 00:00:00 2001
From: advan <advan@JinHong.ern.nps.edu>
Date: Mon, 2 Sep 2024 14:11:50 -0700
Subject: [PATCH] Assignment 3
---
.../homework3/Yu/README.md | 38 ++
.../homework3/Yu/YuSimulationProgram.java | 476 ++++++++++++++++++
.../homework3/Yu/package-info.java | 10 +
3 files changed, 524 insertions(+)
create mode 100644 assignments/src/MV3500Cohort2024JulySeptember/homework3/Yu/README.md
create mode 100644 assignments/src/MV3500Cohort2024JulySeptember/homework3/Yu/YuSimulationProgram.java
create mode 100644 assignments/src/MV3500Cohort2024JulySeptember/homework3/Yu/package-info.java
diff --git a/assignments/src/MV3500Cohort2024JulySeptember/homework3/Yu/README.md b/assignments/src/MV3500Cohort2024JulySeptember/homework3/Yu/README.md
new file mode 100644
index 0000000000..c5aadebfdc
--- /dev/null
+++ b/assignments/src/MV3500Cohort2024JulySeptember/homework3/Yu/README.md
@@ -0,0 +1,38 @@
+## Homework 3: Example Simulation Recording using OpenDIS Network Streams
+
+<!-- Viewable at https://gitlab.nps.edu/Savage/NetworkedGraphicsMV3500/-/blob/master/assignments/src/MV3500Cohort2024JulySeptember/homework3/README.md -->
+
+### Assignment
+
+1. Adapt the functionality for [OpenDIS ExampleSimulationProgram](../../../../examples/src/OpenDis7Examples/ExampleSimulationProgram.java), modifying provided code
+2. Experiment with the enumeration values that set up each entity and PDU. What works for you? What makes sense for your future work?
+3. Adapt or replace the UML diagrams to describe what you have going on.
+4. Record, save and replay your result stream using [PduRecorder](https://savage.nps.edu/opendis7-java/javadoc/edu/nps/moves/dis7/utilities/stream/PduRecorder.html) or [Wireshark](https://www.wireshark.org)
+ * see local [assignments/src/pduLog](../../../pduLog) subdirectory for latest opendis log files
+ * Coming soon, we will also (again have) [X3D-Edit](https://savage.nps.edu/X3D-Edit) for DIS stream recording/replay
+5. Observe good-practice conventions in the [assignments README](../../../README.md) and [current-course README](../README.md) instructions.
+
+This assignment presents a Problem Prototyping opportunity.
+While some minimal functionality is expected, the general outline of
+a networking problem and proposed solution holds great interest.
+Think of it as warmup preparation for your future work.
+
+This is also a freeplay opportunity.
+You have the option to pick one or more of the provided course example programs
+and adapt the source to demonstrate a new client-server handshake protocol of interest.
+
+Be sure to provide a rationale that justifies why the networking choices you made
+(TCP/UDP, unicast/multicast, etc.) are the best for the problem you are addressing.
+
+You may find that the prior [homework2 README](../homework2/README.md) still provides
+helpful details on what specific deliverables are expected in each homework assignment.
+
+Team efforts are encouraged, though if you choose a team approach be sure to justify why.
+This is a good warmup prior to final projects. Have fun with Java networking!
+
+### Prior Assignment, August 2019
+
+In 2019, students worked together on a single project to check wireless multicast connectivity recently deployed on NPS campus.
+
+See their experimental results in the [NPS Multicast Connectivity Report](../../MV3500Cohort2019JulySeptember/homework3).
+
diff --git a/assignments/src/MV3500Cohort2024JulySeptember/homework3/Yu/YuSimulationProgram.java b/assignments/src/MV3500Cohort2024JulySeptember/homework3/Yu/YuSimulationProgram.java
new file mode 100644
index 0000000000..bfef8b9ea1
--- /dev/null
+++ b/assignments/src/MV3500Cohort2024JulySeptember/homework3/Yu/YuSimulationProgram.java
@@ -0,0 +1,476 @@
+/**
+ * Copyright (c) 2008-2023, MOVES Institute, Naval Postgraduate School (NPS). All rights reserved.
+ * This work is provided under a BSD open-source license, see project license.html or license.txt
+ *
+ * @author Jin Hong Yu
+ */
+package MV3500Cohort2024JulySeptember.homework3.Yu;
+
+import edu.nps.moves.dis7.entities.swe.platform.surface._001Poseidon;
+import edu.nps.moves.dis7.entities.swe.platform.surface._002Triton;
+import edu.nps.moves.dis7.enumerations.*;
+import edu.nps.moves.dis7.pdus.*;
+import edu.nps.moves.dis7.utilities.DisChannel;
+import edu.nps.moves.dis7.utilities.PduFactory;
+import java.time.LocalDateTime;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+/**
+ * The purpose of our code is to simulate a sea-based defense scenario where a ship
+ * tracks and attempts to shoot down an incoming enemy missile using an anti-air missile,
+ * with a 70% hit chance per shot. The simulation updates entity states and actions,
+ * which are communicated over the network using DIS PDUs, ensuring synchronized interaction
+ * between entities. The simulation continues iteratively, sending PDUs each loop until the
+ * enemy missile is either destroyed or the simulation ends.
+ *
+ * @see
+ * <a href="https://gitlab.nps.edu/Savage/NetworkedGraphicsMV3500/-/blob/master/examples/src/OpenDis7Examples/ExampleSimulationProgramLog.txt" target="_blank">ExampleSimulationProgramLog.txt</a>
+ * @see
+ * <a href="https://gitlab.nps.edu/Savage/NetworkedGraphicsMV3500/-/blob/master/examples/src/OpenDis7Examples/ExampleSimulationProgramPduCaptureLog.dislog" target="_blank">ExampleSimulationProgramPduCaptureLog.dislog</a>
+ * @see
+ * <a href="https://gitlab.nps.edu/Savage/NetworkedGraphicsMV3500/-/blob/master/examples/src/OpenDis7Examples/ExampleSimulationProgramFlowDiagram.pdf" target="_blank">ExampleSimulationProgramFlowDiagram.pdf</a>
+ * @see
+ * <a href="https://gitlab.nps.edu/Savage/NetworkedGraphicsMV3500/-/blob/master/examples/src/OpenDis7Examples/ExampleSimulationProgramWireshark.png" target="_blank">ExampleSimulationProgramWireshark.png</a>
+ * @see
+ * <a href="https://gitlab.nps.edu/Savage/NetworkedGraphicsMV3500/-/blob/master/examples/src/OpenDis7Examples/ExampleSimulationProgramSequenceDiagram.png" target="_blank">ExampleSimulationProgramSequenceDiagram.png</a>
+ */
+public class YuSimulationProgram {
+
+ /* **************************** infrastructure code, modification is seldom needed ************************* */
+
+ private String descriptor = this.getClass().getSimpleName();
+ /**
+ * DIS channel defined by network address/port combination includes multiple
+ * utility capabilities
+ */
+ protected DisChannel disChannel;
+ /**
+ * Factory object used to create new PDU instances
+ */
+ protected PduFactory pduFactory;
+
+ /**
+ * seconds per loop for real-time or simulation execution
+ */
+ private double simulationTimeStepDuration = 1.0; // seconds TODO encapsulate
+ /**
+ * initial simulation time in seconds
+ */
+ double simulationTimeInitial = 0.0;
+ /**
+ * current simulation time in seconds
+ */
+ double simulationTimeSeconds = simulationTimeInitial;
+ /**
+ * Maximum number of simulation loops
+ */
+ int MAX_LOOP_COUNT = 4;
+
+ String narrativeMessage1 = new String();
+ String narrativeMessage2 = new String();
+ String narrativeMessage3 = new String();
+
+ /**
+ * EntityID settings for entity 1
+ */
+ protected EntityID entityID_1 = new EntityID();
+ /**
+ * EntityID settings for entity 2
+ */
+ protected EntityID entityID_2 = new EntityID();
+ /**
+ * ESPDU for entity 1
+ */
+ protected EntityStatePdu entityStatePdu_1;
+ /**
+ * ESPDU for entity 2
+ */
+ protected EntityStatePdu entityStatePdu_2;
+ /**
+ * FirePdu for entity 1 first weapon (if any)
+ */
+ protected FirePdu firePdu_1a;
+ /**
+ * FirePdu for entity 1 second weapon (if any)
+ */
+ protected FirePdu firePdu_1b;
+ /**
+ * MunitionDescriptor for these weapons
+ */
+ protected MunitionDescriptor munitionDescriptor1;
+
+ // hey programmer, what other state do you want? this is a good place to declare it...
+ /**
+ * Constructor to create an instance of this class. Design goal: additional
+ * built-in initialization conveniences can go here to keep your efforts
+ * focused on the runSimulation() method.
+ */
+ // base constructor is not invoked automatically by other constructors
+ // https://stackoverflow.com/questions/581873/best-way-to-handle-multiple-constructors-in-java
+ public YuSimulationProgram() {
+ initialize();
+ }
+
+ /**
+ * Constructor to create an instance of this class.
+ *
+ * @param newDescriptor describes this program, useful for logging and
+ * debugging
+ */
+ public YuSimulationProgram(String newDescriptor) {
+ descriptor = newDescriptor;
+ initialize();
+ }
+
+ /**
+ * Utility Constructor that allows your example simulation program to
+ * override default network address and port
+ *
+ * @param address network address to use
+ * @param port corresponding network port to use
+ */
+ public YuSimulationProgram(String address, int port) {
+ disChannel.setNetworkAddress(address);
+ disChannel.setNetworkPort(port);
+ disChannel.setVerboseComments(true); // TODO rename library method to disambiguate CommentPDU
+ // TODO still seems really chatty... add silent mode?
+ disChannel.setVerboseDisNetworkInterface(true); // Default false
+ disChannel.setVerbosePduRecorder(true); // default false
+ initialize();
+ }
+
+ /**
+ * Initialize channel setup for OpenDis7 and report a test PDU
+ *
+ * @see initializeDisChannel
+ * @see initializeSimulationEntities
+ */
+ private void initialize() {
+ initializeDisChannel(); // must come first, uses PduFactory
+
+ initializeSimulationEntities(); // set unchanging parameters
+
+ disChannel.join(); // TODO further functionality expected
+
+ String timeStepMessage = "Simulation timestep duration " + getSimulationTimeStepDuration() + " seconds";
+ disChannel.sendCommentPdu(simulationTimeSeconds, DisChannel.COMMENTPDU_SIMULATION_TIMESTEP, timeStepMessage);
+ // additional constructor initialization can go here
+ }
+
+ /**
+ * Initialize channel setup for OpenDis7 and report a test PDU
+ */
+ private void initializeDisChannel() {
+ if (disChannel == null) {
+ disChannel = new DisChannel();
+ } else {
+ disChannel.printlnTRACE("*** warning, duplicate invocation of initializeDisChannel() ignored");
+ return;
+ }
+ pduFactory = disChannel.getPduFactory();
+ disChannel.setDescriptor(this.getClass().getSimpleName()); // ExampleSimulationProgram might be a superclass
+ disChannel.setUpNetworkInterface();
+ disChannel.printlnTRACE("just checking: disChannel.getNetworkAddress()=" + disChannel.getNetworkAddress()
+ + ", getNetworkPort()=" + disChannel.getNetworkPort());
+ disChannel.getDisNetworkInterface().setVerbose(true); // sending and receipt
+ disChannel.printlnTRACE("just checking: hasVerboseSending()=" + disChannel.getDisNetworkInterface().hasVerboseSending()
+ + ", hasVerboseReceipt()=" + disChannel.getDisNetworkInterface().hasVerboseReceipt());
+ disChannel.getPduRecorder().setVerbose(true);
+
+ // TODO confirm whether recorder is explicitly started by programmer (or not)
+// disChannel.sendCommentPdu(VariableRecordType.OTHER, "DisThreadedNetworkInterface.initializeDisChannel() complete"); // hello channel, debug
+ }
+
+ /**
+ * Get ready, get set... initialize simulation entities. Who's who in the
+ * zoo?
+ */
+ public void initializeSimulationEntities() {
+ if (pduFactory == null) {
+ pduFactory = disChannel.getPduFactory();
+ }
+ entityStatePdu_1 = pduFactory.makeEntityStatePdu();
+ entityStatePdu_2 = pduFactory.makeEntityStatePdu();
+ firePdu_1a = pduFactory.makeFirePdu();
+ firePdu_1b = pduFactory.makeFirePdu();
+ munitionDescriptor1 = new MunitionDescriptor();
+
+ // Your model setup: define participants. who's who in this zoo?
+ // Assuming you keep track of entity objects... here is some support for for Entity 1.
+ // PDU objects are already declared and instances created, so now set their values.
+ // who is who in our big zoo, sufficient for global participation if we need it
+ entityID_1.setSiteID(1).setApplicationID(2).setEntityID(3); // made-up example ID;
+ disChannel.addEntity(entityID_1);
+
+ entityID_2.setSiteID(1).setApplicationID(2).setEntityID(4); // made-up example ID;
+ disChannel.addEntity(entityID_2);
+ // TODO someday, use enumerations for sites as part of a SimulationManager object; e.g. is there a unique site triplet for MOVES Institute?
+
+ entityStatePdu_1.setEntityID(entityID_1);
+ entityStatePdu_1.setForceId(ForceID.FRIENDLY);
+ entityStatePdu_1.setEntityType(new _001Poseidon()); // note import statement above
+// entityStatePdu_1.setMarking("Entity #1");
+ entityStatePdu_1.setEntityType(new edu.nps.moves.dis7.entities.usa.platform.air.MV22B()); // note import statement at top
+ entityStatePdu_1.setMarking("Entity #53");
+ entityStatePdu_1.getMarkingString(); // use Netbeans Debug breakpoint here to check left justified...
+
+ entityStatePdu_2.setEntityID(entityID_2);
+ entityStatePdu_2.setForceId(ForceID.OPPOSING);
+ entityStatePdu_2.setEntityType(new _002Triton()); // note import statement above
+ entityStatePdu_2.setMarking("Entity #2");
+
+ // TODO how should we customize this munition? what are key parameters for your simulation?
+ // more is needed here by scenario authors...
+ munitionDescriptor1.setQuantity(1);
+ firePdu_1a.setDescriptor(munitionDescriptor1).setRange(1000.0f);
+ }
+
+ /**
+ * This runSimulationLoops() method is for you, a customizable
+ * programmer-modifiable code block for defining and running a new
+ * simulation of interest.
+ *
+ * Welcome! Other parts of this program handle bookkeeping and plumbing
+ * tasks so that you can focus on your model entities and activities.
+ * Expandable support includes DIS EntityStatePdu, FirePdu and CommentPdu
+ * all available for modification and sending in a simulation loop.
+ * Continuous improvement efforts seek to make this program as easy and
+ * straightforward as possible for DIS simulationists to use and adapt. All
+ * of the other methods are setup, teardown and configuration that you may
+ * find interesting, even helpful, but don't really have to worry about.
+ */
+ @SuppressWarnings("SleepWhileInLoop") // yes we might do that
+ public void runSimulationLoops() {
+ try {
+ final int SIMULATION_MAX_LOOP_COUNT = 10; // be deliberate out there! also avoid infinite loops.
+ int simulationLoopCount = 0; // variable, initialized at 0
+ boolean simulationComplete = false; // sentinel variable as termination condition, are we done yet?
+ boolean threatNeutralized = false; // Add a variable to indicate threat condition
+
+ // TODO reset Clock Time for today's date and timestamp to zero, providing consistent outputs for each simulation run
+ String timeMessage = "Simulation time " + simulationTimeSeconds + " at LocalDateTime " + LocalDateTime.now();
+ disChannel.sendCommentPdu(simulationTimeSeconds, DisChannel.COMMENTPDU_TIME, timeMessage);
+ // TODO replace enumeration with disChannel.COMMENTPDU_TIME
+ // TODO fix VariableRecordType.TIME_AMP_DATE_VALID
+
+ // ===================================================================================================
+ // loop the simulation while allowed, programmer can set additional conditions to break out and finish
+ while (simulationLoopCount < SIMULATION_MAX_LOOP_COUNT && !threatNeutralized) // are we done yet?
+ {
+ simulationLoopCount++; // good practice: increment loop counter as first action in that loop
+
+ // =============================================================================================
+ // * your own simulation code starts here! *****************************************************
+ // Update enemy missile position
+ entityStatePdu_2.getEntityLocation().setX(entityStatePdu_2.getEntityLocation().getX() - 10.0); // Missile approaches the ship by 10m per timestep
+
+ //Check if the enemy missile is within range (1000m)
+ double distanceToMissile = Math.abs(entityStatePdu_1.getEntityLocation().getX() - entityStatePdu_2.getEntityLocation().getX());
+
+ // =============================================================================================
+ if (distanceToMissile <= 1000.0) {
+ // Fire anti-air missile
+ firePdu_1a.setFiringEntityID(entityStatePdu_1.getEntityID());
+ firePdu_1a.setTargetEntityID(entityStatePdu_2.getEntityID());
+ disChannel.sendSinglePdu(simulationTimeSeconds, firePdu_1a); // Fire the anti-air missile
+
+ // Determine hit or miss
+ double hitChance = Math.random();
+ if (hitChance <= 0.7) {
+ // Hit
+ narrativeMessage1 = "Anti-air missile fired. Threat Neutralized.";
+ threatNeutralized = true;
+ } else {
+ // Miss
+ narrativeMessage1 = "Anti-air missile fired. Missed the target. Re-engaging...";
+ }
+ } else {
+ narrativeMessage1 = "Enemy missile is approaching. Distance: " + distanceToMissile + " meters.";
+ }
+
+ narrativeMessage2 = "runSimulation() loop " + simulationLoopCount;
+ narrativeMessage3 = "";
+
+ // your loop termination condition goes here
+ if (simulationLoopCount > MAX_LOOP_COUNT) // for example
+ {
+ simulationComplete = true;
+ }
+ // =============================================================================================
+ // * your own simulation code is finished here! ************************************************
+ // =============================================================================================
+
+ // staying synchronized with timestep: wait duration for elapsed time in this loop
+ // Thread.sleep needs a (long) parameter for milliseconds, which are clumsy to use sometimes
+ Thread.sleep((long) (getSimulationTimeStepDuration() * 1000)); // units of seconds * (1000 msec/sec) = milliseconds
+ System.out.println("... [Pausing for " + getSimulationTimeStepDuration() + " seconds]");
+
+ // OK now send the status PDUs for this loop, and then continue
+ System.out.println("... sending PDUs of interest for simulation step " + simulationLoopCount + ", monitor loopback to confirm sent");
+ System.out.flush();
+
+ // TODO set timesteps in PDUs
+ sendAllPdusForLoopTimestep(simulationTimeSeconds,
+ entityStatePdu_1,
+ firePdu_1a,
+ DisChannel.COMMENTPDU_APPLICATION_STATUS,
+ narrativeMessage1, narrativeMessage2, narrativeMessage3);
+ disChannel.sendSinglePdu(simulationTimeSeconds, entityStatePdu_2); // me too i.e. 2!
+
+ System.out.println("... [PDUs of interest successfully sent for this loop]");
+ System.out.flush();
+
+ // ===============================
+ // current loop now finished, check whether to terminate if simulation complete, otherwise continue
+ if (simulationComplete || (simulationLoopCount > 10000)) // for example; including fail-safe condition is good
+ {
+ System.out.println("... [loop termination condition met, simulationComplete=" + simulationComplete + "]"); // ", final loopCount=" + loopCount +
+ System.out.flush();
+ break;
+ }
+ simulationTimeSeconds += getSimulationTimeStepDuration(); // good practice: increment simulationTime as lastst action in that loop
+
+ } // end of simulation loop, continue until done
+ // ===================================================================================================// ===================================================================================================// ===================================================================================================// ===================================================================================================
+
+ narrativeMessage2 = "runSimulation() completed successfully"; // all done, so tell everyone else on the channel
+ // TODO better javadoc needs to be autogenerated for VariableRecordType enumerations
+ disChannel.sendCommentPdu(DisChannel.COMMENTPDU_NARRATIVE, narrativeMessage1, narrativeMessage2, narrativeMessage3);
+ System.out.println("... [final=completion CommentPdu successfully sent for simulation]");
+
+// disChannel.getPduRecorder(). TODO record XML as well
+ disChannel.leave(); // embedded SimulationManager is expected to send appropriate PDUs for entity, application shutdown
+ } catch (InterruptedException iex) // handle any exception that your code might choose to provoke!
+ {
+ Logger.getLogger(YuSimulationProgram.class.getSimpleName()).log(Level.SEVERE, null, iex);
+ }
+ }
+
+ /**
+ * Send EntityState, Fire, Comment PDUs that got updated for this loop,
+ * reflecting state of current simulation timestep.
+ *
+ * @param simTimeSeconds simulation time in second, applied to PDU as
+ * timestamp
+ * @param entityStatePdu the ESPDU to send, if any
+ * @param firePdu the FirePDU to send, if any
+ * @param commentType enumeration value describing purpose of the narrative
+ * comment PDU
+ * @param comments String array of narrative comments
+ * @see DisChannel // * @see DisTime // TODO find renamed version
+ * @see
+ * <a href="https://docs.oracle.com/javase/tutorial/java/javaOO/arguments.html" target="_blank">Passing
+ * Information to a Method or a Constructor</a> Arbitrary Number of
+ * Arguments
+ */
+ public void sendAllPdusForLoopTimestep(double simTimeSeconds,
+ EntityStatePdu entityStatePdu,
+ FirePdu firePdu,
+ VariableRecordType commentType,
+ // vararg... variable-length set of String comments can optionally follow
+ String... comments) {
+ if (entityStatePdu != null) {
+ disChannel.sendSinglePdu(simTimeSeconds, entityStatePdu);
+ }
+
+ if (firePdu != null) {
+ disChannel.sendSinglePdu(simTimeSeconds, firePdu); // bang
+ }
+ disChannel.sendCommentPdu(simTimeSeconds, commentType, comments); // empty comments are filtered
+ }
+
+ /**
+ * Initial execution via main() method: handle args array of command-line
+ * initialization (CLI) arguments here
+ *
+ * @param args command-line parameters: network address and port
+ */
+ protected void handleArguments(String[] args) {
+ // initial execution: handle args array of initialization arguments here
+ if (args.length == 2) {
+ if ((args[0] != null) && !args[0].isEmpty()) {
+ thisProgram.disChannel.setNetworkAddress(args[0]);
+ }
+ if ((args[1] != null) && !args[1].isEmpty()) {
+ thisProgram.disChannel.setNetworkPort(Integer.parseInt(args[1]));
+ }
+ } else if (args.length != 0) {
+ System.err.println("Usage: " + thisProgram.getClass().getSimpleName() + " [address port]");
+ System.exit(-1);
+ }
+ }
+
+ /**
+ * Get simple descriptor (such as parent class name) for this network
+ * interface, used in trace statements
+ *
+ * @return simple descriptor name
+ */
+ public String getDescriptor() {
+ return descriptor;
+ }
+
+ /**
+ * Set new simple descriptor (such as parent class name) for this network
+ * interface, used in trace statements
+ *
+ * @param newDescriptor simple descriptor name for this interface
+ */
+ public void setDescriptor(String newDescriptor) {
+ if (newDescriptor == null) {
+ newDescriptor = "";
+ }
+ this.descriptor = newDescriptor;
+ }
+
+ /**
+ * parameter accessor method
+ *
+ * @return the simulationTimeStepDuration in seconds
+ */
+ public double getSimulationTimeStepDuration() {
+ return simulationTimeStepDuration;
+ }
+
+ /**
+ * parameter accessor method
+ *
+ * @param timeStepDurationSeconds the simulationTimeStepDuration in seconds
+ * to set
+ */
+ public void setSimulationTimeStepDuration(double timeStepDurationSeconds) {
+ this.simulationTimeStepDuration = timeStepDurationSeconds;
+ }
+
+ /**
+ * Locally instantiable copy of program, can be subclassed.
+ */
+ protected static YuSimulationProgram thisProgram;
+
+ /**
+ * Main method is first executed when a program instance is loaded.
+ *
+ * @see
+ * <a href="https://docs.oracle.com/javase/tutorial/getStarted/application/index.html" target="_blank">Java
+ * Tutorials: A Closer Look at the "Hello World!" Application</a>
+ * @param args command-line parameters: network address and port.
+ * Command-line arguments are an array of optional String parameters that
+ * are passed from execution environment during invocation
+ */
+ public static void main(String[] args) {
+ thisProgram = new YuSimulationProgram("test constructor"); // create instance of self within static main() method
+
+ thisProgram.disChannel.printlnTRACE("main() started...");
+
+ thisProgram.handleArguments(args); // process any command-line invocation arguments
+
+ thisProgram.runSimulationLoops(); // ... your simulation execution code goes in there ...
+
+ thisProgram.disChannel.tearDownNetworkInterface(); // make sure no processes are left lingering
+
+ thisProgram.disChannel.printlnTRACE("complete."); // report successful completion
+
+ System.exit(0); // ensure all threads and sockets released
+ }
+}
diff --git a/assignments/src/MV3500Cohort2024JulySeptember/homework3/Yu/package-info.java b/assignments/src/MV3500Cohort2024JulySeptember/homework3/Yu/package-info.java
new file mode 100644
index 0000000000..f01ae7a1e4
--- /dev/null
+++ b/assignments/src/MV3500Cohort2024JulySeptember/homework3/Yu/package-info.java
@@ -0,0 +1,10 @@
+/**
+ * Final project assignments supporting the NPS MOVES MV3500 Networked Graphics course.
+ *
+ * @see <a href="https://gitlab.nps.edu/Savage/NetworkedGraphicsMV3500/-/tree/master/assignments" target="_blank">networkedGraphicsMV3500 assignments</a>
+ * @see java.lang.Package
+ * @see <a href="https://stackoverflow.com/questions/22095487/why-is-package-info-java-useful" target="_blank">StackOverflow: why-is-package-info-java-useful</a>
+ * @see <a href="https://stackoverflow.com/questions/624422/how-do-i-document-packages-in-java" target="_blank">StackOverflow: how-do-i-document-packages-in-java</a>
+ */
+
+package MV3500Cohort2024JulySeptember.homework3.Yu;
--
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