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assignments/src/MV3500Cohort2021JulySeptember/homework3/McNeely/ExampleSimulationProgramMcNeely.java

+/**
+ * Copyright (c) 2008-2021, MOVES Institute, Naval Postgraduate School (NPS). All rights reserved.
+ * This work is provided under a BSD open-source license, see project license.html and license.txt
+ */
+package MV3500Cohort2021JulySeptember.homework3.McNeely;
+
+import edu.nps.moves.dis7.enumerations.VariableRecordType;
+import edu.nps.moves.dis7.pdus.CommentPdu;
+import edu.nps.moves.dis7.pdus.EntityID;
+import edu.nps.moves.dis7.pdus.EntityStatePdu;
+import edu.nps.moves.dis7.pdus.FirePdu;
+import edu.nps.moves.dis7.pdus.Pdu;
+import edu.nps.moves.dis7.utilities.DisThreadedNetworkInterface;
+import edu.nps.moves.dis7.utilities.PduFactory;
+import edu.nps.moves.dis7.utilities.stream.PduRecorder;
+import java.util.ArrayList;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+/** The purpose of this program is to provide an easily modifiable example simulation program
+ *  that includes DIS-capable entities doing tasks and reporting them to the network.
+ *  Default settings include PDU recording turned on by default.
+ */
+public class ExampleSimulationProgramMcNeely
+{
+    /**
+     * This runSimulation() method is for you! This block is programmer-modifiable method 
+     * for defining and running a new simulation of interest.
+     * Support include 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 new simulationists to use and adapt.
+     * All of the other methods are setup, teardown and configuration that you don't have to worry about.
+     */
+    @SuppressWarnings("SleepWhileInLoop")
+    public void runSimulation ()
+    {
+      try
+      {
+        /** seconds for real-time execution (not simulation time, which may or may not be the same) */
+        final double LOOP_DURATION_SECONDS  =  1.0; 
+        final int    MAX_LOOP_COUNT = 10;   // be deliberate out out there!
+              int    loopCount = 0;         // initialized at 0
+        boolean simulationComplete = false; // sentinel variable as termination condition,, are we done yet?
+        
+        // TODO reset clock to zero each time for consistent outputs
+        
+        // your model setup: who's who in this zoo?
+        // create PDU objects and set their values
+        
+        EntityID       entityID_1    = new EntityID();
+        entityID_1.setSiteID(1).setApplicationID(2).setEntityID(3); // made-up example ID; 
+        // TODO use enumerations; is there a unique site triplet for MOVES Institute?
+
+        EntityStatePdu entityStatePdu = pduFactory.makeEntityStatePdu();
+        entityStatePdu.setEntityID(entityID_1);
+
+        FirePdu               firePdu = pduFactory.makeFirePdu();
+        // should we customize this munition?  what is it for your simulation?
+        
+        // TODO simulation management PDUs for startup
+        
+        // loop the simulation while allowed, programmer can set additional conditions to break out and finish
+        while (loopCount < MAX_LOOP_COUNT)  // are we done yet?
+        {
+            loopCount++; // good practice: increment loop counter as first action
+            
+            // =============================================================================================
+            // your own simulation code starts here!
+            
+            //  are there any other variables to modify at the beginning of your loop?
+            
+            // compute a track, update an ESPDU, whatever it is that your model is doing...
+            
+            // Where is my entity?  Insert changes in position.
+            entityStatePdu.getEntityLocation().setX(entityStatePdu.getEntityLocation().getX() + 1.0); // 1m per timestep
+            
+            // decide whether to fire, and then update the firePdu.  Hmmm, you might want a target to shoort at!
+            
+            // etc. etc. your code goes here
+                
+            // something happens between my simulation entities, la de da de da...
+            System.out.println ("... I think my simulation just did a thing, no really...");
+            
+            
+            // make your reports: narrative code for CommentPdu here (set all to empty strings to avoid sending)
+            narrativeMessage1 = "MV3500 ExampleSimulationProgram";
+            narrativeMessage2 = "runSimulation() loop " + loopCount;
+            narrativeMessage3 = "Well... there it is."; // intentionally blank for testing
+
+            // your loop termination condition goes here
+            if (loopCount > 4) // for example
+            {
+                simulationComplete = true;
+            }      
+            // your own simulation code is finished here!
+            // =============================================================================================
+            
+            // keep track of 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)(LOOP_DURATION_SECONDS * 1000)); // seconds * (1000 msec/sec) = milliseconds
+            System.out.println ("... [Pausing for " + LOOP_DURATION_SECONDS + " seconds]");
+            
+            // send the status PDUs for this loop and continue
+            System.out.println ("sending PDUs for simulation step " + loopCount + ", monitor loopback to confirm sent");
+            sendAllPdus(entityStatePdu, firePdu, timeStepComment, narrativeMessage1, narrativeMessage2, narrativeMessage3);
+            System.out.println ("... [PDUs successfully sent for this loop]");
+            
+            // ===============================
+            // loop now finished, thus terminate if simulation complete, otherwise send latest PDUs and continue
+            if (simulationComplete || (loopCount > 10000)) // for example; including fail-safe condition is good
+            {
+                System.out.println ("... [Termination condition met, simulationComplete=" + simulationComplete + "]"); // ", final loopCount=" + loopCount + 
+                break;
+            }
+        }   // end of while loop
+        // all done
+        narrativeMessage2 = "runSimulation() completed successfully";
+        sendCommentPdu(narrativeComment, narrativeMessage1, narrativeMessage2, narrativeMessage3);
+        System.out.println ("... [final CommentPdu successfully sent for simulation]");
+        // TODO simulation management PDUs
+      } 
+      catch (InterruptedException iex) // handle any exception that your code might choose to provoke!
+      {
+        Logger.getLogger(ExampleSimulationProgramMcNeely.class.getName()).log(Level.SEVERE, null, iex);
+      }
+    }
+    /* **************************** infrastructure code, modification is seldom needed ************************* */
+        
+    private boolean verboseComments = true;
+    String narrativeMessage1 = new String();
+    String narrativeMessage2 = new String();
+    String narrativeMessage3 = new String();
+          
+    /* VariableRecordType enumerations have potential use with CommentPdu logs */
+    VariableRecordType descriptionComment = VariableRecordType.DESCRIPTION;
+    VariableRecordType   narrativeComment = VariableRecordType.COMPLETE_EVENT_REPORT;
+    VariableRecordType      statusComment = VariableRecordType.APPLICATION_STATUS;
+    VariableRecordType    timeStepComment = VariableRecordType.APPLICATION_TIMESTEP;
+    VariableRecordType       otherComment = VariableRecordType.OTHER;
+        
+	/**
+	 * Output prefix to identify this class, helps with logging
+	 */
+    private final static String TRACE_PREFIX = "[" + ExampleSimulationProgramMcNeely.class.getName() + "] ";
+    
+    // class variables
+    PduFactory pduFactory = new PduFactory();
+    DisThreadedNetworkInterface disNetworkInterface;
+    DisThreadedNetworkInterface.PduListener pduListener;
+    Pdu receivedPdu;
+    
+    static final String networkAddress_DEFAULT = "239.1.2.3";
+    static final int    networkPort_DEFAULT    = 3000;
+    static       String networkAddress         = networkAddress_DEFAULT;
+    static       int    networkPort            = networkPort_DEFAULT;
+    
+    /**
+     * Constructor design goal: additional built-in initialization conveniences can go here
+     * to keep student efforts focused on the runSimulation() method.
+     */
+    public ExampleSimulationProgramMcNeely()
+    {
+        // Constructor is under consideration.  Constructor is not currently needed.
+    }
+    
+    /**
+     * 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 ExampleSimulationProgramMcNeely(String address, int port)
+    {
+        setNetworkAddress(address);
+        
+        setNetworkPort(port);
+    }
+
+    /**
+     * @return the networkAddress
+     */
+    public String getNetworkAddress()
+    {
+        return networkAddress;
+    }
+
+    /**
+     * @param newNetworkAddress the networkAddress to set
+     */
+    public final void setNetworkAddress(String newNetworkAddress)
+    {
+        ExampleSimulationProgramMcNeely.networkAddress = newNetworkAddress;
+    }
+
+    /**
+     * @return the networkPort
+     */
+    public int getNetworkPort()
+    {
+        return networkPort;
+    }
+
+    /**
+     * @param newNetworkPort the networkPort to set
+     */
+    public final void setNetworkPort(int newNetworkPort)
+    {
+        ExampleSimulationProgramMcNeely.networkPort = newNetworkPort;
+    }
+
+    /**
+     * Initialize network interface, choosing best available network interface
+     */
+    public void setUpNetworkInterface()
+    {
+        disNetworkInterface = new DisThreadedNetworkInterface(getNetworkAddress(), getNetworkPort());
+        
+        System.out.println("Network confirmation: address=" + disNetworkInterface.getMulticastGroup() + " port=" + disNetworkInterface.getDisPort());
+        pduListener = new DisThreadedNetworkInterface.PduListener()
+        {
+            /** Callback handler for listener */
+            @Override
+            public void incomingPdu(Pdu newPdu)
+            {
+                receivedPdu = newPdu;
+            }
+        };
+        disNetworkInterface.addListener(pduListener);
+    }
+
+    /** All done, release network resources */
+    public void tearDownNetworkInterface()
+    {
+        disNetworkInterface.removeListener(pduListener);
+        disNetworkInterface.kill();
+        disNetworkInterface = null;
+    }
+
+    /** 
+     * Send a single Protocol Data Unit (PDU) of any type
+     * @param pdu the pdu to send
+     */
+    private void sendSinglePdu(Pdu pdu)
+    {
+        try
+        {
+            disNetworkInterface.send(pdu);
+            Thread.sleep(100); // TODO consider refactoring the wait logic and moving externally
+        } 
+        catch (InterruptedException ex)
+        {
+            System.err.println(this.getClass().getName() + " Error sending PDU: " + ex.getLocalizedMessage());
+            System.exit(1);
+        }
+    }
+
+    /**
+     * Send Comment PDU
+     * @see <a href="https://docs.oracle.com/javase/tutorial/java/javaOO/arguments.html">Passing Information to a Method or a Constructor</a> Arbitrary Number of Arguments
+     * @param commentType    enumeration value describing purpose of the narrative comment
+     * @param comments       String array of narrative comments
+     */
+    public void sendCommentPdu(VariableRecordType commentType,
+                                     // vararg... variable-length set of String comments can optionally follow
+                                       String... comments)
+    {
+        sendAllPdus (null, null, commentType, comments);
+    }
+
+    /**
+     * Send EntityState, Fire, Comment PDUs
+     * @see <a href="https://docs.oracle.com/javase/tutorial/java/javaOO/arguments.html">Passing Information to a Method or a Constructor</a> Arbitrary Number of Arguments
+     * @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
+     * @param comments       String array of narrative comments
+     */
+    public void sendAllPdus(EntityStatePdu entityStatePdu,
+                                   FirePdu firePdu,
+                        VariableRecordType commentType,
+                              // vararg... variable-length set of String comments can optionally follow
+                                 String... comments)
+    {
+        if (entityStatePdu != null)
+            sendSinglePdu(entityStatePdu);
+            
+        if (firePdu != null)
+            sendSinglePdu(firePdu); // bang
+        
+        if ((comments != null) && (comments.length > 0))
+        {
+            ArrayList<String> newCommentsList = new ArrayList<>();
+            for (int i = 0; i < comments.length; i++)
+            {
+                if (!comments[i].isEmpty())
+                     newCommentsList.add(comments[i]); // OK found something to send
+            }
+            if (!newCommentsList.isEmpty())
+            {
+                if (commentType == null)
+                    commentType = otherComment; // fallback value otherComment
+                // now build the commentPdu from these string inputs
+                CommentPdu commentPdu = pduFactory.makeCommentPdu(commentType, newCommentsList.toArray(new String[0])); // comments);
+                sendSinglePdu(commentPdu);
+                if (isVerboseComments())
+                    System.out.println("*** [Narrative comment sent: " + commentType.name() + "] " + newCommentsList.toString());
+            }
+        }
+    }
+  
+    /**
+     * Main method is first executed when a program instance is loaded.
+     * @see <a href="https://docs.oracle.com/javase/tutorial/getStarted/application/index.html">Java Tutorials: A Closer Look at the "Hello World!" Application</a>
+     * @param args command-line arguments are an array of optional String parameters that are passed from execution environment during invocation
+     */
+    public static void main(String[] args)
+    {
+        System.out.println(TRACE_PREFIX + "started...");
+        
+        ExampleSimulationProgramMcNeely thisProgram = new ExampleSimulationProgramMcNeely(); // creates instance
+        
+        // initial execution: can handle args array of initialization arguments here
+        if (args.length == 2)
+        {
+            if ((args[0] != null) && !args[0].isEmpty())
+                thisProgram.setNetworkAddress(args[0]);
+            
+            if ((args[1] != null) && !args[1].isEmpty())
+                thisProgram.setNetworkPort(Integer.parseInt(args[1]));
+        }
+        else if (args.length != 0)
+        {
+            System.err.println("Usage: " + thisProgram.getClass().getName() + " [address port]");
+            System.exit(-1);
+        }
+        // OK here we go...
+
+        thisProgram.setUpNetworkInterface();
+        
+        String DEFAULT_OUTPUT_DIRECTORY = "./pduLog";
+        String outputDirectory = DEFAULT_OUTPUT_DIRECTORY;
+        System.out.println("Beginning pdu save to directory " + outputDirectory);
+        PduRecorder pduRecorder = new PduRecorder(outputDirectory, networkAddress, networkPort); // assumes save
+
+        thisProgram.runSimulation (); // ... your simulation execution code goes in there ...
+        
+        pduRecorder.end();
+
+        thisProgram.tearDownNetworkInterface(); // make sure no processes are left lingering
+        
+        System.out.println(TRACE_PREFIX + "complete."); // report successful completion
+    }
+
+    /**
+     * @return whether verboseComments mode is enabled
+     */
+    public boolean isVerboseComments() {
+        return verboseComments;
+    }
+
+    /**
+     * @param newVerboseComments whether verboseComments mode is enabled
+     */
+    public void setVerboseComments(boolean newVerboseComments) {
+        this.verboseComments = newVerboseComments;
+    }
+}