Examples of java.nio.channels.SocketChannel.connect()

java.nio.channels.SocketChannel.connect()
Connect the socket to remote address.
If the channel is blocking, this method will suspend before connection finished or an I/O exception. If the channel is non-blocking, this method will return true if the connection is finished at once or return false and the connection must wait finishConnect to finished otherwise.

This method can be called at any moment, and can block other read and write operations while connecting.

This method just execute the same security checks as the connect method of the Socket class.
@param address The address to be connected. @return true if connection is finished,falseotherwise. @throws AlreadyConnectedException If the channel is connected already. @throws ConnectionPendingException A non-blocking connecting is doing on this channel. @throws ClosedChannelException If the channel is already closed. @throws AsynchronousCloseException If the channel is closed by another thread while this method is in operation. @throws ClosedByInterruptException If another thread interrupts the calling thread while the operation is in progress. The calling thread will have the interrupt state set, and the channel will be closed. @throws UnresolvedAddressException If the address is not resolved. @throws UnsupportedAddressTypeException If the address type is not supported. @throws SecurityException If there is a security manager, and the address is not permitted to access. @throws IOException Some other IO error occurred.

                throw new IllegalStateException(e);
            }
        }
        final boolean connected;
        try {
            connected = ch.connect(sockAddr);
        } catch (IOException e) {
            LOG.error("Failed to connect socket: " + sockAddr, e);
            throw new IllegalStateException(e);
        }
        if(!connected) {

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    try{      
      final SocketChannel  channel = SocketChannel.open();
      
      channel.configureBlocking( false );
    
      if ( channel.connect( new InetSocketAddress("localhost", 8765 ))){
              
        outgoing( channel );
        
      }else{

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            throw new IllegalStateException("Cannot open a channel", e);
        }


        // Connect
        try {
            channel.connect(this.socketAddress);
        } catch (IOException e) {
            cleanChannel(channel);
            throw new IllegalStateException("Cannot connect the channel", e);
        }

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    }
    
    else if(session.getClass() == ClientIoSession.class) {  //注册连接操作
      ClientIoSession clientIoSession = (ClientIoSession) session;
      SelectionKey selectKey = channel.register(selector, SelectionKey.OP_CONNECT, session);
      channel.connect(clientIoSession.getConnectAddress());
      session.setSelectionKey(selectKey);
    }
    
    //开启定时检查
    session.lastAccessTime = System.currentTimeMillis();

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    }
    getLogger().log(Level.FINE, "opening port " + port);
    SocketAddress address = new InetSocketAddress("localhost",port);
    SocketChannel channel = SocketChannel.open();
    channel.configureBlocking(false);
    if (! channel.connect(address)) {
      // we're willing to wait for about a second.
      for (int i = 0; (! channel.finishConnect()) && i < 4; i++) {
  try {
    getLogger().log(Level.FINE, "not connected; sleeping (" + i + ").");
    Thread.currentThread().sleep(250);

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        try
        {
            SocketChannel sc = SocketChannel.open();
            //        SocketChannel sc = (SocketChannel)GetChannel();
            sc.configureBlocking(false);
            if (!sc.connect(isa))
            {
                SetConnecting();
            }
            else
            {

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        // connect to a running server. We get an immediate result if
        // the socket is blocking, and either true or false if it's non blocking
        boolean connected;
        try {
            connected = clientSocket.connect(remoteAddress);
        } catch (IOException e) {
            ConnectFuture future = new ConnectFuture();
            future.cannotConnect(e);
            return future;
        }

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            // prepare the handler for the connection
            client = CTPConnection.client(host, selectionKey, handler, connectionManager);
            selectionKey.attach(client);


            // connect (non-blocking)
            channel.connect(address);


        } catch(IOException e) {
            handler.connectionClosed(client, e);
        }
    }

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    public void startConnection( HttpDestination destination )
        throws IOException
    {
        SocketChannel channel = SocketChannel.open();
        Address address = destination.isProxied() ? destination.getProxy() : destination.getAddress();
        channel.connect(address.toSocketAddress());
        channel.configureBlocking( false );
        channel.socket().setSoTimeout( _httpClient.getSoTimeout());
        _selectorManager.register( channel, destination );
    }

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        int attempts = 0;
        while (true)
        {
            try
            {
                channel.connect(new InetSocketAddress(to, DatabaseDescriptor.getStoragePort()));
                // success
                return channel;
            }
            catch (IOException e)
            {

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