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Brutzman, Don authoredBrutzman, Don authored
ExampleSimulationProgram.java 17.95 KiB
/**
* Copyright (c) 2008-2022, 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
* @author brutzman@nps.edu
*/
package OpenDis7Examples;
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.entities.usa.platform.air.CH53ESuperStallion;
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.util.logging.Level;
import java.util.logging.Logger;
/** The purpose of this inheritable class is to provide an easily modifiable example simulation program
* that includes DIS-capable entities performing tasks of interest, and then reporting activity via PDUs
* to the network.
* Default program initialization includes PDU recording turned on by default.
* @see <a href="https://gitlab.nps.edu/Savage/NetworkedGraphicsMV3500/-/blob/master/examples/src/OpenDis7Examples/ExampleSimulationProgramLog.txt">ExampleSimulationProgramLog.txt</a>
*/
public class ExampleSimulationProgram
{
/* **************************** 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 for real-time execution (not simulation time, which may or may not be .the same) */
double currentTimeStep = 1.0; // seconds
/** initial simulation time */
double initialTime = 0.0;
/** current simulation time */
double simulationTime;
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;
/**
* 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 ExampleSimulationProgram()
{
initialize();
}
/** * Constructor to create an instance of this class.
* @param newDescriptor describes this program, useful for logging and debugging
*/
public ExampleSimulationProgram(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 ExampleSimulationProgram(String address, int port)
{
disChannel.setNetworkAddress(address);
disChannel.setNetworkPort (port);
initialize();
}
/** Initialize channel setup for OpenDis7 and report a test PDU */
private void initialize()
{
initializeDisChannel(); // must come first
initializeSimulationEntities();
disChannel.join(); // TODO further functionality expected
// additional constructor initialization goes 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 ("disChannel.getNetworkAddress()=" + disChannel.getNetworkAddress() +
", getNetworkPort()=" + disChannel.getNetworkPort());
// disChannel.sendCommentPdu(VariableRecordType.OTHER, "ArrivalProcessOpenDis7 initialized"); // hello channel
}
/** Get ready, get set... initialize simulation entities
*/
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.
// TODO better javadoc needed for site, application, entity determining the identity triplet
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; 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 CH53ESuperStallion()); // 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 is it for your simulation? more is needed here...
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 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?
// TODO reset Clock Time to today's date and timestamp to zero, providing consistent outputs for each simulation run
disChannel.getPduRecorder().setVerbose(true);
// ===================================================================================================
// loop the simulation while allowed, programmer can set additional conditions to break out and finish
while (simulationLoopCount < SIMULATION_MAX_LOOP_COUNT) // are we done yet?
{
simulationLoopCount++; // good practice: increment loop counter as first action in that loop
// =============================================================================================
// * 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; this sample only changes X position.
entityStatePdu_1.getEntityLocation().setX(entityStatePdu_1.getEntityLocation().getX() + 1.0); // 1m per timestep
// decide whether to fire, and then update the firePdu. Hmmm, you might want a target to shoot at!
// etc. etc. your code goes here for your simulation of interest
// something happens between my simulation entities, la de da de da...
System.out.println ("... My simulation just did something, no really..."); System.out.flush(); // make sure this arrives to user even if other threads somehow become deadlocked
// make your reports: narrative code for CommentPdu here (set all to empty strings to avoid sending)
narrativeMessage1 = "MV3500 ExampleSimulationProgram";
narrativeMessage2 = "runSimulation() loop " + simulationLoopCount;
narrativeMessage3 = ""; // intentionally blank for testing
// your loop termination condition goes here
if (simulationLoopCount > 4) // 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)(currentTimeStep * 1000)); // units of seconds * (1000 msec/sec) = milliseconds
System.out.println ("... [Pausing for " + currentTimeStep + " 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();
sendAllPdusForLoopTimestep(entityStatePdu_1,
firePdu_1a,
disChannel.COMMENTPDU_APPLICATION_STATUS,
narrativeMessage1, narrativeMessage2, narrativeMessage3);
disChannel.sendSinglePdu(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;
}
} // end of simulation loop
// ===================================================================================================// ===================================================================================================
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.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(ExampleSimulationProgram.class.getSimpleName()).log(Level.SEVERE, null, iex);
}
}
/**
* Send EntityState, Fire, Comment PDUs that got updated for this loop, reflecting state of current simulation timestep.
* @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
* @see DisChannel
*/
public void sendAllPdusForLoopTimestep(EntityStatePdu entityStatePdu,
FirePdu firePdu, VariableRecordType commentType,
// vararg... variable-length set of String comments can optionally follow
String... comments)
{
if (entityStatePdu != null)
disChannel.sendSinglePdu(entityStatePdu);
if (firePdu != null)
disChannel.sendSinglePdu(firePdu); // bang
disChannel.sendCommentPdu(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 handleArgs (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;
}
/** Locally instantiable copy of program, can be subclassed. */
protected static ExampleSimulationProgram 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">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 ExampleSimulationProgram("test constructor"); // create instance of self within static main() method
thisProgram.disChannel.printlnTRACE("main() started...");
thisProgram.handleArgs (args); // process 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
}
}