org.glassfish.grizzly.samples.udpmulticast.MulticastChat Maven / Gradle / Ivy
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package org.glassfish.grizzly.samples.udpmulticast;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.InetSocketAddress;
import java.nio.charset.Charset;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.logging.Logger;
import org.glassfish.grizzly.Connection;
import org.glassfish.grizzly.filterchain.FilterChain;
import org.glassfish.grizzly.filterchain.FilterChainBuilder;
import org.glassfish.grizzly.filterchain.TransportFilter;
import org.glassfish.grizzly.nio.transport.UDPNIOConnection;
import org.glassfish.grizzly.nio.transport.UDPNIOTransport;
import org.glassfish.grizzly.nio.transport.UDPNIOTransportBuilder;
import org.glassfish.grizzly.utils.JdkVersion;
import org.glassfish.grizzly.utils.StringFilter;
/**
* Simple chat application based on UDP multicast.
*
* Requires JDK 1.7+
*
* When you run MulticastChat application, the first thing you might want to know
* is network interfaces' names available on your system (command #6), so type:
*
* '$ 6'
and press enter to see the interfaces and check if they support multicasting.
*
* On my system I see:
*
* "
* $6
* wlan0 support-multicast=true
* eth0 support-multicast=true
* lo support-multicast=false
* "
*
* which means I can use wlan0 and eth0 interfaces to test multicasting.
*
* So now I have to join the multicasting group
*
* "
* $2 228.5.6.7 eth0
* "
*
*
* The output would be like:
*
* "
* Tue Sep 11 16:09:42 CEST 2012 /10.163.25.1:8888: joined the group /228.5.6.7
* "
*
*
* Run MulticastChat application on different machine (it's better to use
* local network, cause multicasting might be blocked by routers), run the
* same/similar commands, so both clients join the same multicast group.
*
* To send message to the multicast group use the command like:
*
* "
* $1 228.5.6.7 hello
* "
*
*
* @see UDPNIOConnection
*
* @author Alexey Stashok
*/
public class MulticastChat {
private static final Logger logger = Logger.getLogger(MulticastChat.class.getName());
private static final int PORT = 8888;
public static void main(String[] args) throws Exception {
new MulticastChat().run();
}
private void run() throws Exception {
// Check if current JDK version is higher or equals to 1.7.0
final JdkVersion jdkVersion = JdkVersion.getJdkVersion();
final JdkVersion minimumVersion = JdkVersion.parseVersion("1.7.0");
if (minimumVersion.compareTo(jdkVersion) > 0) { // If JDK version is >= 1.7
System.out.println("Sample requires JDK 1.7+");
System.exit(1);
}
// Build FilterChain to parse incoming UDP packets and print to System.out
final FilterChain filterChain = FilterChainBuilder.stateless()
// Add TransportFilter, which will be responsible for reading and
// writing data to the connection
.add(new TransportFilter())
// Add String codec (responsible for byte[] <-> String conversion)
.add(new StringFilter(Charset.forName("UTF-8")))
// Add PrintFilter, which is responsible for printing incoming messages
.add(new PrintFilter())
.build();
// Create UDP transport
final UDPNIOTransport transport =
UDPNIOTransportBuilder.newInstance()
.setProcessor(filterChain)
.build();
UDPNIOConnection connection = null;
try {
// start the transport
transport.start();
// Create non-connected UDP connection and bind it to the local PORT
final Future connectFuture = transport.connect(
null, new InetSocketAddress(PORT));
connection = (UDPNIOConnection) connectFuture.get(10, TimeUnit.SECONDS);
// Prepare the console reader
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in, Charset.forName("UTF-8")));
printCommands();
do {
System.out.print("\n$");
try {
// Parse the chat command
final ChatCommand command = ChatCommand.parse(reader.readLine());
if (command == null) {
// If chat command is not recognized - print menu
printCommands();
} else {
// Run the command
command.run(connection);
// Exit if needed (only exit command returns true)
if (command.isExit()) {
return;
}
}
} catch (Throwable t) {
System.out.println(t.getClass().getName() + ": " + t.getMessage());
}
} while (true);
} finally {
// Close connection is it's not null
if (connection != null) {
connection.close();
}
logger.fine("Stopping transport...");
// stop the transport
transport.shutdownNow();
logger.fine("Stopped transport...");
}
}
/**
* Prints the menu of the available commands.
*/
private static void printCommands() {
System.out.println("Please make your choice (type command number and command parameters separated by space:");
System.out.println("1: send message. Parameters: group_addr message. Example: '$1 228.5.6.7 hello'");
System.out.println("2: join the group. Parameters: group_addr network_interface [source]. Example: '$2 228.5.6.7 eth0'");
System.out.println("3: leave the group. Parameters: group_addr network_interface [source]. Example: '$3 228.5.6.7 eth0'");
System.out.println("4: block the source. Parameters: group_addr network_interface source. Example: '$4 228.5.6.7 eth0 192.168.0.10'");
System.out.println("5: unblock the source. Parameters: group_addr network_interface source. Example: '$5 228.5.6.7 eth0 192.168.0.10'");
System.out.println("6: list network interfaces. No parameters");
System.out.println("7: exit");
}
}
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