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package ch.epfl.xblast.server;
import ch.epfl.xblast.Lists;
import ch.epfl.xblast.PlayerAction;
import ch.epfl.xblast.PlayerID;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.net.StandardProtocolFamily;
import java.nio.ByteBuffer;
import java.nio.channels.DatagramChannel;
import java.util.*;
/**
* The Server class.
*
* @author Pacien TRAN-GIRARD (261948)
*/
public class Server {
public static final int DEFAULT_PORT = 2016;
private static final int DEFAULT_EXPECTED_CLIENTS = PlayerID.values().length;
private static class Channel {
private static InetSocketAddress listeningInterface(String host, int port) {
if (Objects.isNull(host))
return new InetSocketAddress(port);
else
return new InetSocketAddress(host, port);
}
private static DatagramChannel openChannel(InetSocketAddress iface) {
try {
DatagramChannel chan = DatagramChannel.open(StandardProtocolFamily.INET);
chan.bind(iface);
return chan;
} catch (IOException e) {
e.printStackTrace();
System.exit(1);
return null;
}
}
private final DatagramChannel channel;
Channel(InetSocketAddress iface) {
this.channel = openChannel(iface);
}
Channel(String host, Integer port) {
this(listeningInterface(host, Optional.ofNullable(port).orElse(DEFAULT_PORT)));
}
void closeChannel() {
try {
this.channel.close();
} catch (IOException e) {
e.printStackTrace();
}
}
List<SocketAddress> acceptRegistrations(int registrations) {
List<SocketAddress> clients = new ArrayList<>(registrations);
while (clients.size() < registrations) {
SocketAddress client = this.acceptRegistration();
if (!clients.contains(client))
clients.add(client);
}
return Collections.unmodifiableList(clients);
}
Map<SocketAddress, PlayerAction> collectActions() {
Map<SocketAddress, PlayerAction> actions = new HashMap<>();
Optional<Map.Entry<SocketAddress, PlayerAction>> action;
while (true) {
action = this.receiveAction(false);
if (!action.isPresent()) break;
actions.put(action.get().getKey(), action.get().getValue());
}
return Collections.unmodifiableMap(actions);
}
private Optional<Map.Entry<SocketAddress, Byte>> receiveByte(boolean block) {
try {
ByteBuffer buf = ByteBuffer.allocate(1);
this.channel.configureBlocking(block);
SocketAddress client = this.channel.receive(buf);
if (Objects.isNull(client) || buf.position() == 0)
throw new IOException();
return Optional.of(new AbstractMap.SimpleImmutableEntry<>(client, buf.get(0)));
} catch (IOException e) {
return Optional.empty();
}
}
private Optional<Map.Entry<SocketAddress, PlayerAction>> receiveAction(boolean block) {
try {
Map.Entry<SocketAddress, Byte> actionByte = this.receiveByte(block).get();
PlayerAction playerAction = PlayerAction.fromByte(actionByte.getValue());
return Optional.of(new AbstractMap.SimpleImmutableEntry<>(actionByte.getKey(), playerAction));
} catch (NoSuchElementException | IllegalArgumentException e) {
return Optional.empty();
}
}
private Map.Entry<SocketAddress, PlayerAction> acceptAction() {
Optional<Map.Entry<SocketAddress, PlayerAction>> action;
do {
action = this.receiveAction(true);
} while (!action.isPresent());
return action.get();
}
private SocketAddress acceptRegistration() {
Map.Entry<SocketAddress, PlayerAction> clientAction;
do {
clientAction = this.acceptAction();
} while (clientAction.getValue() != PlayerAction.JOIN_GAME);
return clientAction.getKey();
}
}
private final Channel channel;
private final int expectedClients;
private Map<SocketAddress, PlayerID> registeredClientsMap;
private Map<PlayerID, SocketAddress> playersAddressMap;
public Server(String iface, Integer port, Integer expectedClients) {
this.channel = new Channel(iface, port);
this.expectedClients = Optional.ofNullable(expectedClients).orElse(DEFAULT_EXPECTED_CLIENTS);
}
public void run() {
this.acceptClientRegistrations();
this.runGame();
this.channel.closeChannel();
}
private void acceptClientRegistrations() {
List<SocketAddress> clients = this.channel.acceptRegistrations(this.expectedClients);
this.registeredClientsMap = Lists.linearAdjustedMap(clients, Arrays.asList(PlayerID.values()));
this.playersAddressMap = Lists.invertMap(this.registeredClientsMap);
}
private void runGame() {
GameState gameState = GameState.DEFAULT_GAME_STATE;
while (!gameState.isGameOver()) {
gameState = updateGameState(updateGameState(gameState));
// TODO: send updated game state to clients
try {
Thread.sleep(10000);
// TODO: adapt sleeping time
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
private GameState updateGameState(GameState gs) {
Map<PlayerID, PlayerAction> events = Lists.traverseMaps(this.playersAddressMap, this.channel.collectActions());
return gs.next(events);
}
}
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