Пример #1
0
  /** Selects on sockets and informs their Communicator when there is something to do. */
  public void communicate(int timeout) {

    try {
      selector.select(timeout);
    } catch (IOException e) {
      // Not really sure why/when this happens yet
      return;
    }

    Iterator<SelectionKey> keys = selector.selectedKeys().iterator();

    while (keys.hasNext()) {
      SelectionKey key = keys.next();
      keys.remove();
      if (!key.isValid()) continue; // WHY
      Communicator communicator = (Communicator) key.attachment();

      if (key.isReadable()) communicator.onReadable();
      if (key.isWritable()) communicator.onWritable();
      if (key.isAcceptable()) communicator.onAcceptable();
    }

    // Go through the queue and handle each communicator
    while (!queue.isEmpty()) {
      Communicator c = queue.poll();
      c.onMemo();
    }
  }
Пример #2
0
  /**
   * Serves the incoming connections.
   *
   * @throws IOException
   * @throws DirectoryException
   */
  private void serveIncomingConnections() throws IOException, DirectoryException {
    int selectorState = selector.select();

    // We can't rely on return value of select to determine if any keys
    // are ready.
    // see http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4850373
    for (Iterator<SelectionKey> iterator = selector.selectedKeys().iterator();
        iterator.hasNext(); ) {
      SelectionKey key = iterator.next();
      iterator.remove();
      if (key.isAcceptable()) {
        // Accept the new client connection.
        ServerSocketChannel serverChannel = (ServerSocketChannel) key.channel();
        SocketChannel clientChannel = serverChannel.accept();
        if (clientChannel != null) {
          acceptConnection(clientChannel);
        }
      }

      if (selectorState == 0 && enabled && !shutdownRequested && logger.isTraceEnabled()) {
        // Selected keys was non empty but select() returned 0.
        // Log warning and hope it blocks on the next select() call.
        logger.trace(
            "Selector.select() returned 0. "
                + "Selected Keys: %d, Interest Ops: %d, Ready Ops: %d ",
            selector.selectedKeys().size(), key.interestOps(), key.readyOps());
      }
    }
  }
Пример #3
0
 /**
  * Vorbedingung: variante und selectors sind ungleich null. selectors enthaelt keine Elemente
  * gleich null
  *
  * @param variante
  * @return true, wenn alle Selektoren die Variante selektieren, false anderenfalls.
  */
 private boolean select(Variante variante, List<Selector<Variante>> selectors) {
   for (Selector<Variante> selector : selectors) {
     if (!selector.select(variante)) {
       return false;
     }
   }
   return true;
 }
Пример #4
0
 private void dispatch() throws IOException {
   sel.select();
   for (Iterator i = sel.selectedKeys().iterator(); i.hasNext(); ) {
     SelectionKey sk = (SelectionKey) i.next();
     i.remove();
     Handler h = (Handler) sk.attachment();
     h.handle(sk);
   }
 }
Пример #5
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 protected Selectable select(Selector selector, List<String> strings) {
   List<String> results = new ArrayList<String>();
   for (String string : strings) {
     String result = selector.select(string);
     if (result != null) {
       results.add(result);
     }
   }
   return new PlainText(results);
 }
Пример #6
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 /**
  * Prepare NIO objects and start processing looping in current thread. Never exit unless abortion
  * because of exception.
  */
 public void startService() {
   try {
     prepareNioObjects();
     while (selector.select() > 0) {
       frameProcess();
     }
   } catch (IOException e) {
     e.printStackTrace();
   }
 }
Пример #7
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 @Override
 public String select(String text) {
   for (Selector selector : selectors) {
     if (text == null) {
       return null;
     }
     text = selector.select(text);
   }
   return text;
 }
Пример #8
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  static void test() throws Exception {
    ServerSocketChannel ssc = null;
    SocketChannel sc = null;
    SocketChannel peer = null;
    try {
      ssc = ServerSocketChannel.open().bind(new InetSocketAddress(0));

      // loopback connection
      InetAddress lh = InetAddress.getLocalHost();
      sc = SocketChannel.open(new InetSocketAddress(lh, ssc.socket().getLocalPort()));
      peer = ssc.accept();

      // peer sends message so that "sc" will be readable
      int n = peer.write(ByteBuffer.wrap("Hello".getBytes()));
      assert n > 0;

      sc.configureBlocking(false);

      Selector selector = Selector.open();
      SelectionKey key = sc.register(selector, SelectionKey.OP_READ | SelectionKey.OP_WRITE);

      boolean done = false;
      int failCount = 0;
      while (!done) {
        int nSelected = selector.select();
        if (nSelected > 0) {
          if (nSelected > 1) throw new RuntimeException("More than one channel selected");
          Set<SelectionKey> keys = selector.selectedKeys();
          Iterator<SelectionKey> iterator = keys.iterator();
          while (iterator.hasNext()) {
            key = iterator.next();
            iterator.remove();
            if (key.isWritable()) {
              failCount++;
              if (failCount > 10) throw new RuntimeException("Test failed");
              Thread.sleep(250);
            }
            if (key.isReadable()) {
              done = true;
            }
          }
        }
      }
    } finally {
      if (peer != null) peer.close();
      if (sc != null) sc.close();
      if (ssc != null) ssc.close();
    }
  }
Пример #9
0
 public void run() {
   for (; ; ) {
     try {
       int n = sel.select();
       if (n > 0) processSelectedKeys();
       processPendingTargets();
       if (shutdown) {
         sel.close();
         return;
       }
     } catch (IOException x) {
       x.printStackTrace();
     }
   }
 }
Пример #10
0
  public Vector<Chromosome> callSelector(Vector<Chromosome> from, int num) {
    Vector<Chromosome> result = null;

    if (selector != null) {
      result = selector.select(from, num);
    } else {
      result = from;
    }

    last_population = new Vector<Chromosome>();
    for (Chromosome chrom : result) {
      last_population.add(chrom);
    }

    return result;
  }
Пример #11
0
  public void run() {
    try {
      SocketChannel sc = SocketChannel.open();
      InetSocketAddress sinaAddr = new InetSocketAddress("sina.com", 80);
      sc.socket().connect(sinaAddr);

      // init a selector via helper class selector provider
      Selector aSel = SelectorProvider.provider().openSelector();

      Socket soc = new Socket("host", 80);
      soc.getChannel().register(aSel, SelectionKey.OP_ACCEPT);

      // init a channel for server socket. method 1
      ServerSocketChannel ssc = ServerSocketChannel.open();
      ssc.configureBlocking(true);

      // method 2, get server socket first, then init its channel
      ServerSocket ss = new ServerSocket();
      ServerSocketChannel ssc2 = ss.getChannel();

      // set socket channel as non blocking.
      ssc.configureBlocking(false);

      InetSocketAddress isa = new InetSocketAddress("localhost", 9999);
      ssc.socket().bind(isa);

      SelectionKey acceptKey = ssc.register(aSel, SelectionKey.OP_ACCEPT);
      int keysAdded = 0;
      while ((keysAdded = aSel.select()) > 0) {
        Set readyKeys = aSel.selectedKeys();
        Iterator i = readyKeys.iterator();
        while (i.hasNext()) {
          SelectionKey sk = (SelectionKey) i.next();
          i.remove();
          ServerSocketChannel n = (ServerSocketChannel) sk.channel();
          // now we got a new socket and its channel after accept in server
          Socket s = n.accept().socket();
          SocketChannel socketChannel = s.getChannel();
          socketChannel.register(aSel, SelectionKey.OP_READ);
        }
      }
    } catch (Exception e) {

    }
  }
Пример #12
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();
    }
  }
Пример #13
0
  private void go() throws IOException {
    // Create a new selector
    Selector selector = Selector.open();

    // Open a listener on each port, and register each one
    // with the selector
    for (int i = 0; i < ports.length; ++i) {
      ServerSocketChannel ssc = ServerSocketChannel.open();
      ssc.configureBlocking(false);
      ServerSocket ss = ssc.socket();
      InetSocketAddress address = new InetSocketAddress(ports[i]);
      ss.bind(address);

      SelectionKey key = ssc.register(selector, SelectionKey.OP_ACCEPT);

      System.out.println("Going to listen on " + ports[i]);
    }

    while (true) {
      int num = selector.select();

      Set selectedKeys = selector.selectedKeys();
      Iterator it = selectedKeys.iterator();

      while (it.hasNext()) {
        SelectionKey key = (SelectionKey) it.next();

        if ((key.readyOps() & SelectionKey.OP_ACCEPT) == SelectionKey.OP_ACCEPT) {
          // Accept the new connection
          ServerSocketChannel ssc = (ServerSocketChannel) key.channel();
          SocketChannel sc = ssc.accept();
          sc.configureBlocking(false);

          // Add the new connection to the selector
          SelectionKey newKey = sc.register(selector, SelectionKey.OP_READ);
          it.remove();

          System.out.println("Got connection from " + sc);
        } else if ((key.readyOps() & SelectionKey.OP_READ) == SelectionKey.OP_READ) {
          // Read the data
          SocketChannel sc = (SocketChannel) key.channel();

          // Echo data
          int bytesEchoed = 0;
          while (true) {
            echoBuffer.clear();

            int r = sc.read(echoBuffer);

            if (r <= 0) {
              break;
            }

            echoBuffer.flip();

            sc.write(echoBuffer);
            bytesEchoed += r;
          }

          System.out.println("Echoed " + bytesEchoed + " from " + sc);

          it.remove();
        }
      }

      // System.out.println( "going to clear" );
      //      selectedKeys.clear();
      // System.out.println( "cleared" );
    }
  }
    public void run() {
      // Here's where everything happens. The select method will
      // return when any operations registered above have occurred, the
      // thread has been interrupted, etc.
      try {
        while (!stop) {
          try {
            if (selector.select() > 0) {
              if (stop) {
                break;
              }
              // Someone is ready for I/O, get the ready keys
              Set readyKeys = selector.selectedKeys();
              Iterator it = readyKeys.iterator();

              // Walk through the ready keys collection and process date requests.
              while (it.hasNext()) {
                SelectionKey sk = (SelectionKey) it.next();
                it.remove();
                SocketChannel readChannel = null;
                TcpAddress incomingAddress = null;
                if (sk.isAcceptable()) {
                  // The key indexes into the selector so you
                  // can retrieve the socket that's ready for I/O
                  ServerSocketChannel nextReady = (ServerSocketChannel) sk.channel();
                  // Accept the date request and send back the date string
                  Socket s = nextReady.accept().socket();
                  readChannel = s.getChannel();
                  readChannel.configureBlocking(false);
                  readChannel.register(selector, SelectionKey.OP_READ);

                  incomingAddress = new TcpAddress(s.getInetAddress(), s.getPort());
                  SocketEntry entry = new SocketEntry(incomingAddress, s);
                  sockets.put(incomingAddress, entry);
                  timeoutSocket(entry);
                  TransportStateEvent e =
                      new TransportStateEvent(
                          DefaultTcpTransportMapping.this,
                          incomingAddress,
                          TransportStateEvent.STATE_CONNECTED,
                          null);
                  fireConnectionStateChanged(e);
                } else if (sk.isReadable()) {
                  readChannel = (SocketChannel) sk.channel();
                  incomingAddress =
                      new TcpAddress(
                          readChannel.socket().getInetAddress(), readChannel.socket().getPort());
                } else if (sk.isWritable()) {
                  try {
                    SocketEntry entry = (SocketEntry) sk.attachment();
                    SocketChannel sc = (SocketChannel) sk.channel();
                    if (entry != null) {
                      writeMessage(entry, sc);
                    }
                  } catch (IOException iox) {
                    if (logger.isDebugEnabled()) {
                      iox.printStackTrace();
                    }
                    logger.warn(iox);
                    TransportStateEvent e =
                        new TransportStateEvent(
                            DefaultTcpTransportMapping.this,
                            incomingAddress,
                            TransportStateEvent.STATE_DISCONNECTED_REMOTELY,
                            iox);
                    fireConnectionStateChanged(e);
                    sk.cancel();
                  }
                } else if (sk.isConnectable()) {
                  try {
                    SocketEntry entry = (SocketEntry) sk.attachment();
                    SocketChannel sc = (SocketChannel) sk.channel();
                    if ((!sc.isConnected()) && (sc.finishConnect())) {
                      sc.configureBlocking(false);
                      logger.debug("Connected to " + entry.getPeerAddress());
                      // make sure conncetion is closed if not used for timeout
                      // micro seconds
                      timeoutSocket(entry);
                      sc.register(selector, SelectionKey.OP_WRITE, entry);
                    }
                    TransportStateEvent e =
                        new TransportStateEvent(
                            DefaultTcpTransportMapping.this,
                            incomingAddress,
                            TransportStateEvent.STATE_CONNECTED,
                            null);
                    fireConnectionStateChanged(e);
                  } catch (IOException iox) {
                    if (logger.isDebugEnabled()) {
                      iox.printStackTrace();
                    }
                    logger.warn(iox);
                    sk.cancel();
                  }
                }

                if (readChannel != null) {
                  try {
                    readMessage(sk, readChannel, incomingAddress);
                  } catch (IOException iox) {
                    // IO exception -> channel closed remotely
                    if (logger.isDebugEnabled()) {
                      iox.printStackTrace();
                    }
                    logger.warn(iox);
                    sk.cancel();
                    readChannel.close();
                    TransportStateEvent e =
                        new TransportStateEvent(
                            DefaultTcpTransportMapping.this,
                            incomingAddress,
                            TransportStateEvent.STATE_DISCONNECTED_REMOTELY,
                            iox);
                    fireConnectionStateChanged(e);
                  }
                }
              }
            }
          } catch (NullPointerException npex) {
            // There seems to happen a NullPointerException within the select()
            npex.printStackTrace();
            logger.warn("NullPointerException within select()?");
          }
          processPending();
        }
        if (ssc != null) {
          ssc.close();
        }
      } catch (IOException iox) {
        logger.error(iox);
        lastError = iox;
      }
      if (!stop) {
        stop = true;
        synchronized (DefaultTcpTransportMapping.this) {
          server = null;
        }
      }
    }
Пример #15
0
 /**
  * Find elements that match the {@link Selector} CSS query, with this element as the starting
  * context. Matched elements may include this element, or any of its children.
  *
  * <p>This method is generally more powerful to use than the DOM-type {@code getElementBy*}
  * methods, because multiple filters can be combined, e.g.:
  *
  * <ul>
  *   <li>{@code el.select("a[href]")} - finds links ({@code a} tags with {@code href} attributes)
  *   <li>{@code el.select("a[href*=example.com]")} - finds links pointing to example.com (loosely)
  * </ul>
  *
  * <p>See the query syntax documentation in {@link org.jsoup.select.Selector}.
  *
  * @param cssQuery a {@link Selector} CSS-like query
  * @return elements that match the query (empty if none match)
  * @see org.jsoup.select.Selector
  */
 public Elements select(String cssQuery) {
   return Selector.select(cssQuery, this);
 }
Пример #16
0
  public void init() throws IOException {
    this._logger = LoggerFactory.getLogger(AcquirePort.class);
    selector = Selector.open();
    // 通过open方法来打开一个未绑定的ServerSocketChannel实例
    ServerSocketChannel server = ServerSocketChannel.open();
    InetSocketAddress isa = new InetSocketAddress(_acquirePort);
    // 将该ServerSocketChannel绑定到指定IP地址
    server.socket().bind(isa);
    // 设置ServerSocket以非阻塞方式工作
    server.configureBlocking(false);
    // 将server注册到指定Selector对象
    server.register(selector, SelectionKey.OP_ACCEPT);
    // 定义准备执行读取数据的ByteBuffer
    ByteBuffer buff = ByteBuffer.allocate(1024);
    while (selector.select() > 0) {
      // 依次处理selector上的每个已选择的SelectionKey
      Set<SelectionKey> sks = selector.selectedKeys();
      Iterator keys = sks.iterator();
      while (keys.hasNext()) {
        SelectionKey sk = (SelectionKey) keys.next();
        // 从selector上的已选择Key集中删除正在处理的SelectionKey
        keys.remove();
        // 如果sk对应的通道包含客户端的连接请求
        if (sk.isAcceptable()) {
          // 调用accept方法接受连接,产生服务器端对应的SocketChannel
          SocketChannel sc = server.accept();
          // 设置采用非阻塞模式
          sc.configureBlocking(false);
          // 将该SocketChannel也注册到selector
          sc.register(selector, SelectionKey.OP_READ);
        }
        // 如果sk对应的通道有数据需要读取
        if (sk.isReadable()) {
          // 获取该SelectionKey对应的Channel,该Channel中有可读的数据
          SocketChannel sc = (SocketChannel) sk.channel();
          // 开始读取数据

          try {
            while (sc.read(buff) > 0) {
              buff.flip();
              this._logger.info("content" + buff);
              sc.write(buff);
              if (buff.hasRemaining()) {
                buff.compact();
              } else {
                buff.clear();
              }
            }
            // 打印从该sk对应的Channel里读取到的数据
            this._logger.info("accpect content" + buff);
          }
          // 如果捕捉到该sk对应的Channel出现了异常,即表明该Channel
          // 对应的Client出现了问题,所以从Selector中取消sk的注册
          catch (IOException ex) {
            // 从Selector中删除指定的SelectionKey
            sk.cancel();
            if (sk.channel() != null) {
              sk.channel().close();
            }
          }
        }
      }
    }
  }