public static void listen(StringTokenizer st) {
try {
if (port[0] == -1) {
if (st.hasMoreTokens()) {
try {
port[0] = Integer.parseInt(st.nextToken());
} catch (NumberFormatException nfe) {
System.err.println("listen: incorrect port name");
return;
}
if (port[0] < 0 || port[0] > 65535) {
System.err.println("listen: port name is out of range 0 - 65535");
port[0] = -1;
return;
}
if (!serverSocket.isOpen()) {
serverSocket = ServerSocketChannel.open();
serverSocket.configureBlocking(false);
}
serverSocket.socket().bind(new InetSocketAddress(port[0]));
serverSocket.register(selector, SelectionKey.OP_ACCEPT);
} else {
System.err.println("listen: no port name");
}
} else {
System.err.println("Error: already listening port " + port[0]);
}
} catch (Exception expt) {
Utils.printErrorAndExit(expt.getMessage());
}
}
public static String getMessageFromTokens(StringTokenizer st) {
StringBuilder sb = new StringBuilder();
while (st.hasMoreTokens()) {
sb.append(st.nextToken()).append(" ");
}
return sb.toString();
}
public static void kill(StringTokenizer st) {
try {
if (st.hasMoreTokens()) {
String clientName = st.nextToken();
if (clients.containsKey(clientName)) {
SocketChannel clientChannel = clients.get(clientName);
clients.remove(clientName);
sendMessage(clientChannel, MessageUtils.bye());
notifyAllClients(clientName + " leave this chatroom");
System.out.println(clientName + " leave this chatroom");
Utils.tryClose(clientChannel);
} else {
System.err.println("kill: no such client");
}
} else {
System.err.println("kill: no client name");
}
} catch (Exception expt) {
Utils.printErrorAndExit(expt.getMessage());
}
}
public static void readCommand() {
try {
if (!reader.ready()) {
return;
}
StringTokenizer tokens = new StringTokenizer(reader.readLine());
if (tokens.hasMoreTokens()) {
switch (tokens.nextToken()) {
case "/listen":
listen(tokens);
break;
case "/stop":
stop();
break;
case "/list":
if (port[0] == -1) {
System.err.println("Error: start listening before");
}
for (Entry<String, SocketChannel> client : clients.entrySet()) {
System.out.println(client.getKey());
}
if (clients.entrySet().isEmpty()) {
System.out.println("list: no clients online");
}
break;
case "/send":
if (tokens.hasMoreTokens()) {
String name = tokens.nextToken();
if (clients.containsKey(name)) {
if (tokens.hasMoreTokens()) {
sendMessage(
clients.get(name),
MessageUtils.message("<server>", getMessageFromTokens(tokens)));
} else {
System.err.println("send: message is empty");
}
} else {
System.err.println("send: no such client");
}
} else {
System.err.println("send: no client name");
}
break;
case "/sendall":
if (tokens.hasMoreTokens()) {
notifyAllClients(getMessageFromTokens(tokens));
} else {
System.err.println("sendall: message is empty");
}
break;
case "/kill":
kill(tokens);
break;
case "/exit":
if (port[0] != -1) {
stop();
}
Utils.tryClose(selector);
System.exit(0);
break;
default:
System.err.print("Error: unknown command");
break;
}
} else {
System.err.println("Error: empty input");
}
} catch (Exception expt) {
Utils.printErrorAndExit(expt.getMessage());
}
}