public static void main(String[] argv) throws Exception {
    Pipe[] pipes = new Pipe[PIPES_COUNT];
    Pipe pipe = Pipe.open();
    Pipe.SinkChannel sink = pipe.sink();
    Pipe.SourceChannel source = pipe.source();
    Selector sel = Selector.open();
    source.configureBlocking(false);
    source.register(sel, SelectionKey.OP_READ);

    for (int i = 0; i < PIPES_COUNT; i++) {
      pipes[i] = Pipe.open();
      Pipe.SourceChannel sc = pipes[i].source();
      sc.configureBlocking(false);
      sc.register(sel, SelectionKey.OP_READ);
      Pipe.SinkChannel sc2 = pipes[i].sink();
      sc2.configureBlocking(false);
      sc2.register(sel, SelectionKey.OP_WRITE);
    }

    for (int i = 0; i < LOOPS; i++) {
      sink.write(ByteBuffer.allocate(BUF_SIZE));
      int x = sel.selectNow();
      sel.selectedKeys().clear();
      source.read(ByteBuffer.allocate(BUF_SIZE));
    }

    for (int i = 0; i < PIPES_COUNT; i++) {
      pipes[i].sink().close();
      pipes[i].source().close();
    }
    pipe.sink().close();
    pipe.source().close();
    sel.close();
  }
Example #2
0
  void checkIO() {
    long timeout;

    if (NewConnections.size() > 0) {
      timeout = -1;
    } else if (!Timers.isEmpty()) {
      long now = new Date().getTime();
      long k = Timers.firstKey();
      long diff = k - now;

      if (diff <= 0) timeout = -1; // don't wait, just poll once
      else timeout = diff;
    } else {
      timeout = 0; // wait indefinitely
    }

    try {
      if (timeout == -1) mySelector.selectNow();
      else mySelector.select(timeout);
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
Example #3
0
 static void releaseTemporarySelector(Selector sel) throws IOException {
   // Selector should be empty
   sel.selectNow(); // Flush cancelled keys
   assert sel.keys().isEmpty() : "Temporary selector not empty";
   localSelectorWrapper.set(null);
 }
Example #4
0
  public static void checkClients(List<SocketChannel> anonymousClients) {
    try {

      if (selector.selectNow() == 0) {
        return;
      }

      Set<SelectionKey> keys = selector.selectedKeys();
      for (SelectionKey key : keys) {

        if ((key.readyOps() & SelectionKey.OP_ACCEPT) == SelectionKey.OP_ACCEPT) {
          SocketChannel clientSocket = serverSocket.accept();
          if (clientSocket == null) {
            System.err.println("Error: can not accept");
            continue;
          }
          anonymousClients.add(clientSocket);
          clientSocket.configureBlocking(false);
          clientSocket.register(selector, SelectionKey.OP_READ);
        } else if ((key.readyOps() & SelectionKey.OP_READ) == SelectionKey.OP_READ) {
          SocketChannel clientSocket = (SocketChannel) key.channel();
          ByteBuffer bytes = ByteBuffer.allocate(4096);

          if (clientSocket.read(bytes) != -1) {
            byte[] message = bytes.array();
            switch (message[0]) {
              case 1:
                {
                  String nick = MessageUtils.parseMessage(message).first;
                  if (!checkMessage(nick, "", clientSocket)) {
                    continue;
                  }

                  if (clients.containsKey(nick) || nick.length() > 32) {
                    if (nick.length() > 32) {
                      sendMessage(
                          clientSocket, MessageUtils.error("<server>: your nick is too long"));
                    } else {
                      sendMessage(
                          clientSocket,
                          MessageUtils.error("<server>: another user is using this nick"));
                    }
                    sendMessage(clientSocket, MessageUtils.bye());
                    anonymousClients.remove(clientSocket);
                    Utils.tryClose(clientSocket);
                  } else {
                    System.out.println(nick + " enter this chatroom");
                    notifyAllClients(nick + " enter this chatroom");

                    sendMessage(
                        clientSocket,
                        MessageUtils.message("<server>", "Wellcome, your nick is " + nick));
                    anonymousClients.remove(clientSocket);
                    clients.put(nick, clientSocket);
                  }
                  break;
                }

              case 2:
                {
                  String nick = getNickFromSocket(clientSocket);
                  if (nick == null) {
                    Utils.printErrorAndExit("Error: it could not happen");
                  }

                  Utils.Pair<String, String> pair = MessageUtils.parseMessage(message);
                  if (!checkMessage(pair.first, pair.second, clientSocket)) {
                    continue;
                  }

                  if (!pair.first.equals(nick)) {
                    System.out.println("Cheater: " + nick);
                    sendMessage(clientSocket, MessageUtils.message("<server>", "do not cheat"));
                  }

                  for (Entry<String, SocketChannel> client : clients.entrySet()) {
                    if (!clientSocket.equals(client.getValue())) {
                      sendMessage(client.getValue(), MessageUtils.message(nick, pair.second));
                    }
                  }
                  break;
                }

              case 3:
                disconnectClient(clientSocket);
                break;

              case 127:
                {
                  String nick = getNickFromSocket(clientSocket);

                  Utils.Pair<String, String> pair = MessageUtils.parseMessage(message);
                  if (!checkMessage(pair.first, pair.second, clientSocket)) {
                    continue;
                  }

                  if (!pair.first.equals(nick)) {
                    System.out.println("Cheater: " + nick);
                    sendMessage(clientSocket, MessageUtils.message("<server>", "do not cheat"));
                  }
                  System.out.println(nick + ": " + pair.second);
                  break;
                }

              default:
                System.out.println("Bad message from " + getNickFromSocket(clientSocket));
                sendMessage(clientSocket, MessageUtils.message("<server>", "bad message"));
                break;
            }
          } else {
            disconnectClient(clientSocket);
          }
        }
      }
      keys.clear();
    } catch (Exception expt) {
      expt.printStackTrace();
      Utils.printErrorAndExit(expt.getMessage());
    }
  }