Landas assignment 2 correction

projects/Assignments/homework2/Hanley_README_MulticastHW.txt

-Hanley README for Multicast Homework
-
-Modified the code from multicast example 1.
-
-- adjusted packet to get compiled for every send
-- computed the "position" of the entity for each packet
-- shout out to Chris A for identifying the need to change the receiver to listen for doubles and not floats
-
-
-********** System outputs for classes:
-
-Sender:
-run-single:
-/239.1.2.15
-Sent multicast packet 0 of 100
-Sent multicast packet 1 of 100
-Sent multicast packet 2 of 100
-Sent multicast packet 3 of 100
-Sent multicast packet 4 of 100
-Sent multicast packet 5 of 100
-Sent multicast packet 6 of 100
-Sent multicast packet 7 of 100
-
-
-Receiver:
-run-single:
-/239.1.2.15
-Number received: 1 X Pos: 1.4142135623730951 Y Pos: 3.414213562373095
-Number received: 2 X Pos: 2.8284271247461903 Y Pos: 4.82842712474619
-Number received: 3 X Pos: 4.242640687119286 Y Pos: 6.242640687119285
-Number received: 4 X Pos: 5.656854249492381 Y Pos: 7.65685424949238
-Number received: 5 X Pos: 7.0710678118654755 Y Pos: 9.071067811865476
-Number received: 6 X Pos: 8.485281374238571 Y Pos: 10.485281374238571
-Number received: 7 X Pos: 9.899494936611667 Y Pos: 11.899494936611667
-Number received: 8 X Pos: 11.313708498984763 Y Pos: 13.313708498984763
\ No newline at end of file

projects/Assignments/homework2/Hanley_multicastHW_receiver.java

-/**
- * This assignment uses the code from MV3500 example "multicastExample1"  
- * modifications were made to way the packet is read to facilitate the double  
- * instead of the float.
- * 
- * @author Brian
- */
-import java.io.*;
-import java.net.*;
-
-
-public class Hanley_multicastHW_receiver {
-    public static final String MULTICAST_ADDRESS = "239.1.2.15";
-    public static final int DESTINATION_PORT = 1717;
-    /** How many routers can be crossed */
-    public static final int TTL = 10; 
-    
-    public static void main(String[] args) 
-    {
-        try
-        {
-        
-            // This is a java/IPv6 problem. You should also add it to the
-            // arguments used to start the app, eg -Djava.net.preferIPv4Stack=true
-            // set in the "run" section of preferences. Also, typically
-            // netbeans must be restarted after these settings.
-            // https://stackoverflow.com/questions/18747134/getting-cant-assign-requested-address-java-net-socketexception-using-ehcache
-            System.setProperty("java.net.preferIPv4Stack", "true");
-            
-            
-            MulticastSocket multicastSocket = new MulticastSocket(DESTINATION_PORT);
-            multicastSocket.setTimeToLive(TTL);
-            InetAddress multicastAddress = InetAddress.getByName(MULTICAST_ADDRESS);
-            System.out.println(multicastAddress);            
-            // Join group useful on receiving side
-            multicastSocket.joinGroup(multicastAddress);
-            // You can join multiple groups here
-            
-            int count = 0;
-            
-            while(true)
-            {
-                byte[] packetArray = new byte[1500];
-                DatagramPacket packet = new DatagramPacket(packetArray, packetArray.length);
-                
-                multicastSocket.receive(packet);
-                count++;
-                
-                ByteArrayInputStream bais = new ByteArrayInputStream(packet.getData());
-                DataInputStream dis = new DataInputStream(bais);
-                double firstNumber = dis.readDouble();
-                double secondNumber = dis.readDouble();
-                
-                System.out.println("Number received: " + count + " X Pos: " + firstNumber + " Y Pos: " + secondNumber);
-            }
-        }
-        catch(Exception e)
-        {
-            System.out.println(e);
-        }
-    }
-    
-}

projects/Assignments/homework2/Hanley_multicastHW_sender.java

-/**
- * This assignment uses the code from MV3500 example "multicastExample1"  
- * modifications were made to the packet creation and where the packet is 
- * assembled.
- * 
- * @author Brian
- */
-
-
-import java.io.*;
-import java.net.*;
-
-
-public class Hanley_multicastHW_sender {
-    public static final String MULTICAST_ADDRESS = "239.1.2.15";
-    public static final int DESTINATION_PORT = 1717;
-    /** How many routers can be crossed */
-    public static final int TTL = 10;
-    private int velocity;
-    private float xPos;
-    private float yPos;
-    
-    
-    public static void main(String[] args) 
-    {
-        int velocity = 2;
-        int dir = 45;
-        double xPos = 0;
-        double yPos = 2;
-              
-        
-        try
-        {
-            // This is a java/IPv6 problem. You should also add it to the
-            // arguments used to start the app, eg -Djava.net.preferIPv4Stack=true
-            // set in the "run" section of preferences. Also, typically
-            // netbeans must be restarted after these settings.
-            // https://stackoverflow.com/questions/18747134/getting-cant-assign-requested-address-java-net-socketexception-using-ehcache
-            System.setProperty("java.net.preferIPv4Stack", "true");
-            
-            
-            MulticastSocket multicastSocket = new MulticastSocket(1718);
-            multicastSocket.setTimeToLive(TTL);
-            InetAddress multicastAddress = InetAddress.getByName(MULTICAST_ADDRESS);
-            System.out.println(multicastAddress);            
-            // Join group useful on receiving side
-            multicastSocket.joinGroup(multicastAddress);
-            // You can join multiple groups here
-            
-       
-            // How fast does this go? Does UDP try to slow it down, or does
-            // this cause network problems? (hint: yes for an unlimited send
-            // rate, unlike TCP). How do you know on the receiving side
-            // that you haven't received a duplicate UDP packet, out of
-            // order packet, or dropped packet?
-            
-            for(int idx = 0; idx < 100; idx++)
-            {
-                
-                xPos = xPos + (Math.cos(Math.toRadians(dir))*velocity); //computes the horixontal displacement for each movement based on velocity - this is a fixed velocity and time increment
-                yPos = yPos + (Math.sin(Math.toRadians(dir))*velocity); //computes the vertical displacement for each movement based on velocity - this is a fixed velocity and time increment
-                
-                ByteArrayOutputStream baos = new ByteArrayOutputStream();
-                DataOutputStream dos = new DataOutputStream(baos);
-                dos.writeDouble(xPos);
-                dos.writeDouble(yPos);
-                
-                
-                byte[] buffer = baos.toByteArray();
-                
-                DatagramPacket packet = new DatagramPacket(buffer, buffer.length, multicastAddress, DESTINATION_PORT);
-                
-               multicastSocket.send(packet);
-               baos.reset();
-               Thread.sleep(1000); // Send 100, one per second
-               System.out.println("Sent multicast packet " + idx + " of 100");
-            }
-        }
-        catch(Exception e)
-        {
-            System.out.println(e);
-        }
-    }
-    
-}