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Commit 37420659 authored by Brutzman, Don's avatar Brutzman, Don
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improved handling of networkInterface

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examples/src/OpenDis7Examples/AllPduReceiver.java
+ 86
− 79
View file @ 37420659
...@@ -23,99 +23,106 @@ public class AllPduReceiver ...@@ -23,99 +23,106 @@ public class AllPduReceiver
/** Output prefix to identify this class */ /** Output prefix to identify this class */
private final static String TRACE_PREFIX = "[" + AllPduReceiver.class.getName() + "] "; private final static String TRACE_PREFIX = "[" + AllPduReceiver.class.getName() + "] ";
/** /**
* Program invocation, execution starts here * Program invocation, execution starts here
* @param args command-line arguments * @param args command-line arguments
*/ */
public static void main(String args[]) public static void main(String args[])
{ {
MulticastSocket multicastSocket; MulticastSocket multicastSocket;
InetAddress internetAddress; InetAddress multicastInetAddress;
PduFactory pduFactory = new PduFactory(); PduFactory pduFactory = new PduFactory();
System.out.println(TRACE_PREFIX + "started..."); System.out.println(TRACE_PREFIX + "started...");
try { try {
if (args.length == 2) if (args.length == 2)
{ {
internetAddress = InetAddress.getByName(args[0]); multicastInetAddress = InetAddress.getByName(args[0]);
multicastSocket = new MulticastSocket(Integer.parseInt(args[1])); multicastSocket = new MulticastSocket(Integer.parseInt(args[1]));
} }
else else
{ {
System.out.println("Usage: AllPduReceiver <multicast group> <port>"); System.out.println("Usage: AllPduReceiver <multicast group> <port>");
System.out.println("Default: AllPduReceiver " + DEFAULT_MULTICAST_ADDRESS + " " + DEFAULT_MULTICAST_PORT); System.out.println("Default: AllPduReceiver " + DEFAULT_MULTICAST_ADDRESS + " " + DEFAULT_MULTICAST_PORT);
multicastSocket = new MulticastSocket(DEFAULT_MULTICAST_PORT); multicastSocket = new MulticastSocket(DEFAULT_MULTICAST_PORT);
internetAddress = InetAddress.getByName(DEFAULT_MULTICAST_ADDRESS); multicastInetAddress = InetAddress.getByName(DEFAULT_MULTICAST_ADDRESS);
} }
System.out.println("To quit: stop or kill this process"); System.out.println("To quit: stop or kill this process");
multicastSocket.joinGroup(internetAddress); // multicastSocket.joinGroup(multicastInetAddress); // deprecated
// =======================================================================
// new approach using interface
NetworkInterface networkInterface = NetworkInterface.getByInetAddress(multicastInetAddress);
SocketAddress localMulticastSocketAddress = new InetSocketAddress(multicastInetAddress, DEFAULT_MULTICAST_PORT);
multicastSocket.joinGroup(localMulticastSocketAddress, networkInterface);
// =======================================================================
byte buffer[] = new byte[1500]; // typical MTU size in bytes byte buffer[] = new byte[1500]; // typical MTU size in bytes
while (true) // Loop infinitely, receiving datagrams
{
Arrays.fill(buffer, (byte)0);
DatagramPacket datagramPacket = new DatagramPacket(buffer, buffer.length); // reset packet each time
multicastSocket.receive(datagramPacket); // process blocks here until receipt of network packet with PDU
// datagramPacket.setLength(buffer.length);
// Pdu pdu = pduFactory.createPdu(packet.getData()); // packet.getData() returns byte[] array data buffer while (true) // Loop indefinitely, receiving datagrams
{
Arrays.fill(buffer, (byte)0);
DatagramPacket datagramPacket = new DatagramPacket(buffer, buffer.length); // reset packet each time
multicastSocket.receive(datagramPacket); // process blocks here until receipt of network packet with PDU
// datagramPacket.setLength(buffer.length);
List<Pdu> pduBundle = pduFactory.getPdusFromBundle(datagramPacket.getData(),datagramPacket.getLength()); // Pdu pdu = pduFactory.createPdu(packet.getData()); // packet.getData() returns byte[] array data buffer
if (pduBundle.isEmpty())
System.out.println("Received PDU bundle is empty, packet.getData().length=" + datagramPacket.getData().length + ", error...");
// else if (pduBundle.size() == 1)// common case, typically unremarkable
// System.out.println("Received PDU bundle size is " + pduBundle.size());
else if (pduBundle.size() > 1)
System.out.println("Received PDU bundle size is " + pduBundle.size());
for (Pdu nextPdu : pduBundle) // iterator loop through PDU bundle List<Pdu> pduBundle = pduFactory.getPdusFromBundle(datagramPacket.getData(),datagramPacket.getLength());
{
DisPduType currentPduType = nextPdu.getPduType(); //short currentPduType = nextPdu.getPduType();
String currentPduTypeName = nextPdu.getClass().getName();
String currentPduFamilyName = nextPdu.getClass().getSuperclass().getSimpleName();
DISProtocolFamily currentProtocolFamilyID = nextPdu.getProtocolFamily(); //short currentProtocolFamilyID = nextPdu.getProtocolFamily();
StringBuilder message = new StringBuilder();
message.append(DisTime.timeStampToString(nextPdu.getTimestamp())).append(" ");
message.append("received new DIS PDU ");
String currentPduTypePadded = String.format("%-48s", currentPduType); // - indicates right padding of whitespace
message.append(currentPduTypePadded);
// optional, verbose
// String currentPduTypeNamePadded = String.format("%-49s", currentPduTypeName); // - indicates right padding of whitespace
// message.append(" of type ").append(currentPduTypeNamePadded); // package.class name
message.append(" (").append(currentProtocolFamilyID);
// message.append(" ").append(currentPduFamilyName); // class name is also available
message.append(")");
System.out.println(message.toString()); // diagnostic information helps
// additional message information of interest, if any if (pduBundle.isEmpty())
switch (currentPduType) // using enumeration values from edu.​nps.​moves.​dis7.​enumerations.​DisPduType System.out.println("Received PDU bundle is empty, packet.getData().length=" + datagramPacket.getData().length + ", error...");
{ // else if (pduBundle.size() == 1)// common case, typically unremarkable
case COMMENT: // System.out.println("Received PDU bundle size is " + pduBundle.size());
CommentPdu commentPdu = (CommentPdu)nextPdu; // cast to precise type else if (pduBundle.size() > 1)
ArrayList<VariableDatum> payloadList = (ArrayList)commentPdu.getVariableDatums(); System.out.println("Received PDU bundle size is " + pduBundle.size());
if (!payloadList.isEmpty())
System.out.print (" messages: "); for (Pdu nextPdu : pduBundle) // iterator loop through PDU bundle
for (VariableDatum variableDatum : payloadList) {
DisPduType currentPduType = nextPdu.getPduType(); //short currentPduType = nextPdu.getPduType();
String currentPduTypeName = nextPdu.getClass().getName();
String currentPduFamilyName = nextPdu.getClass().getSuperclass().getSimpleName();
DISProtocolFamily currentProtocolFamilyID = nextPdu.getProtocolFamily(); //short currentProtocolFamilyID = nextPdu.getProtocolFamily();
StringBuilder message = new StringBuilder();
message.append(DisTime.timeStampToString(nextPdu.getTimestamp())).append(" ");
message.append("received new DIS PDU ");
String currentPduTypePadded = String.format("%-48s", currentPduType); // - indicates right padding of whitespace
message.append(currentPduTypePadded);
// optional, verbose
// String currentPduTypeNamePadded = String.format("%-49s", currentPduTypeName); // - indicates right padding of whitespace
// message.append(" of type ").append(currentPduTypeNamePadded); // package.class name
message.append(" (").append(currentProtocolFamilyID);
// message.append(" ").append(currentPduFamilyName); // class name is also available
message.append(")");
System.out.println(message.toString()); // diagnostic information helps
// additional message information of interest, if any
switch (currentPduType) // using enumeration values from edu.​nps.​moves.​dis7.​enumerations.​DisPduType
{ {
String nextComment = new String(variableDatum.getVariableDatumValue()); // convert byte[] to String case COMMENT:
System.out.print (" \"" + nextComment + "\""); CommentPdu commentPdu = (CommentPdu)nextPdu; // cast to precise type
ArrayList<VariableDatum> payloadList = (ArrayList)commentPdu.getVariableDatums();
if (!payloadList.isEmpty())
System.out.print (" messages: ");
for (VariableDatum variableDatum : payloadList)
{
String nextComment = new String(variableDatum.getVariableDatumValue()); // convert byte[] to String
System.out.print (" \"" + nextComment + "\"");
}
System.out.println();
} }
System.out.println(); }
pduBundle.clear();
} }
} }
pduBundle.clear(); catch (IOException e) {
System.out.println("Problem with OpenDis7Examples.AllPduReceiver, see exception trace:");
System.out.println(e);
}
finally {
System.out.println("OpenDis7Examples.AllPduReceiver complete.");
}
} }
}
catch (IOException e) {
System.out.println("Problem with OpenDis7Examples.AllPduReceiver, see exception trace:");
System.out.println(e);
}
finally {
System.out.println("OpenDis7Examples.AllPduReceiver complete.");
}
}
} }
examples/src/OpenDis7Examples/AllPduSender.java
+ 22
− 11
View file @ 37420659
...@@ -32,7 +32,7 @@ public class AllPduSender ...@@ -32,7 +32,7 @@ public class AllPduSender
* Putting any upper limit on # packets sent avoids possibility of non-terminating infinite loops that continue sending packets. */ * Putting any upper limit on # packets sent avoids possibility of non-terminating infinite loops that continue sending packets. */
private int SEND_LOOPS_TO_PERFORM = 1; private int SEND_LOOPS_TO_PERFORM = 1;
private static InetAddress multicastAddress; private static InetAddress multicastInetAddress;
private static int port; private static int port;
/** Object constructor /** Object constructor
...@@ -43,8 +43,8 @@ public class AllPduSender ...@@ -43,8 +43,8 @@ public class AllPduSender
this.port = DEFAULT_MULTICAST_PORT; this.port = DEFAULT_MULTICAST_PORT;
try try
{ {
multicastAddress = InetAddress.getByName(newMulticastAddress); multicastInetAddress = InetAddress.getByName(newMulticastAddress);
if (!multicastAddress.isMulticastAddress()) if (!multicastInetAddress.isMulticastAddress())
{ {
System.out.println("Not a multicast address: " + newMulticastAddress); System.out.println("Not a multicast address: " + newMulticastAddress);
} }
...@@ -453,13 +453,24 @@ public class AllPduSender ...@@ -453,13 +453,24 @@ public class AllPduSender
// Send the PDUs we created // Send the PDUs we created
System.out.println("Send the " + generatedPdusList.size() + " PDUs we created..."); System.out.println("Send the " + generatedPdusList.size() + " PDUs we created...");
InetAddress localMulticastAddress = InetAddress.getByName(DEFAULT_MULTICAST_ADDRESS); // =======================================================================
// prior appproach
// InetAddress localMulticastAddress = InetAddress.getByName(DEFAULT_MULTICAST_ADDRESS);
// MulticastSocket multicastSocket = new MulticastSocket(DEFAULT_MULTICAST_PORT);
// if (!localMulticastAddress.isMulticastAddress())
// {
// throw new RuntimeException("*** Error: sending to multicast address, but destination address " + localMulticastAddress.toString() + "is not multicast");
// }
// multicastSocket.joinGroup(localMulticastAddress); // deprecated
// =======================================================================
// updated approach using NetworkInterface
NetworkInterface networkInterface = NetworkInterface.getByInetAddress(multicastInetAddress);
if (networkInterface != null)
System.out.println("networkInterface=" + networkInterface.getDisplayName()); // typically null if loopback
SocketAddress localMulticastSocketAddress = new InetSocketAddress(multicastInetAddress, DEFAULT_MULTICAST_PORT);
MulticastSocket multicastSocket = new MulticastSocket(DEFAULT_MULTICAST_PORT); MulticastSocket multicastSocket = new MulticastSocket(DEFAULT_MULTICAST_PORT);
if (!localMulticastAddress.isMulticastAddress()) multicastSocket.joinGroup(localMulticastSocketAddress, networkInterface);
{ // =======================================================================
throw new RuntimeException("*** Error: sending to multicast address, but destination address " + localMulticastAddress.toString() + "is not multicast");
}
multicastSocket.joinGroup(localMulticastAddress);
byte[] buffer; byte[] buffer;
Pdu aPdu; Pdu aPdu;
...@@ -477,7 +488,7 @@ public class AllPduSender ...@@ -477,7 +488,7 @@ public class AllPduSender
aPdu.marshal(dos); // dos is DataOutputStream connected to ByteArrayOutputStrea aPdu.marshal(dos); // dos is DataOutputStream connected to ByteArrayOutputStrea
buffer = baos.toByteArray(); buffer = baos.toByteArray();
packet = new DatagramPacket(buffer, buffer.length, localMulticastAddress, DEFAULT_MULTICAST_PORT); packet = new DatagramPacket(buffer, buffer.length, multicastInetAddress, DEFAULT_MULTICAST_PORT);
multicastSocket.send(packet); multicastSocket.send(packet);
DisPduType disPduType= aPdu.getPduType(); DisPduType disPduType= aPdu.getPduType();
...@@ -526,7 +537,7 @@ public class AllPduSender ...@@ -526,7 +537,7 @@ public class AllPduSender
if (args.length == 2) if (args.length == 2)
{ {
System.out.println("Usage: AllPduSender <multicast group> <port>"); System.out.println("Usage: AllPduSender <multicast group> <port>");
System.out.println("Actual: AllPduSender " + multicastAddress.getHostAddress() + " " + port); System.out.println("Actual: AllPduSender " + multicastInetAddress.getHostAddress() + " " + port);
allPduSender = new AllPduSender(args[0], Integer.parseInt(args[1])); allPduSender = new AllPduSender(args[0], Integer.parseInt(args[1]));
} }
else else
......
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