Examples of java.nio.channels.SocketChannel

java.nio.channels.SocketChannel
A SocketChannel is a selectable channel for part abstraction of stream connecting socket. The socket method of this class can return the related Socket instance, which can handle the socket.
A socket channel is open but not connected when created by open method. After connected by calling the connect method, it will keep connected before closed. The connection is non-blocking that the connect method is for the initial connection and following finishConnect method is for the final steps of connection. The isConnectionPending method can tell the connection is blocked or not; the isConnected method can tell the socket is connected finally or not.

The shut down operation can be independent and asynchronous for input and output. The shutdownInput method is for input, and can make the following read operation fail as end of stream. If the input is shut down and another thread is pending in read operation, the read will end without effect and return end of stream. The shutdownOutput method is for output, and can make the following write operation throwing a ClosedChannelException. If the output is shut down and another is pending in a write operation, an AsynchronousCloseException will thrown to the pending thread.

Socket channels are thread-safe, no more than one thread can read or write at given time. The connect and finishConnect methods are concurrent each other, when they are processing, other read and write will block.

        {
            // clean out cancelled key list
            this._selector.selectNow();
            Object[] arr = null;
            ConnectionHeader header = null;
            SocketChannel channel = null;
            SelectionKey sk = null;


            for ( ; count < size; count++ )
            {
                arr = (Object[]) this._aspirants.remove( 0 );
                header = (ConnectionHeader) arr[0];
                channel = header.getChannel();
                // set a previously blocking socket channel to non-blocking
                // mode to allow selector operations on it
                if ( channel.isBlocking() )
                {
                    logger.log( Level.FINEST,
                                "Setting socket temporarily to non-blocking until further connection processing..." );
                    channel.configureBlocking( false );
                }


                sk = channel.keyFor( this._selector );
                if ( sk == null )
                {
                    // register with no interest
                    sk = channel.register( this._selector, 0 );
                }


                // attach the client connection header
                sk.attach( header );
                // now set the requested interest

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     */
    public int readHeader( ConnectionHeader header, long timeout ) throws IOException
    {
        ByteBuffer headerBuf = ByteBufferAllocator.allocate( EJConstants.NIO_HEADER_SIZE, false );
        int read = 0;
        SocketChannel channel = header.getChannel();


        try
        {
            nonBlockingRead( channel, headerBuf );
            headerBuf.flip();
            read = headerBuf.getInt();
            IOUtil.setReceiveBufferSize( channel.socket(), read );
        }
        catch ( IncompleteIOException ioe )
        {
            logger.log( Level.FINEST, "Incomplete header read detected, registering for read again." );
            // ioe.setIOBuffer(null);

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     * @see de.netseeker.ejoe.io.DataChannel#writeHeader(de.netseeker.ejoe.ConnectionHeader, java.nio.ByteBuffer, long)
     */
    public void writeHeader( ConnectionHeader header, ByteBuffer buffer, long timeout ) throws IOException
    {
        ByteBuffer headerBuf = ByteBufferAllocator.allocate( EJConstants.NIO_HEADER_SIZE, false );
        SocketChannel channel = header.getChannel();


        int length = buffer != null ? buffer.remaining() : 0;
        headerBuf.putInt( length );
        headerBuf.flip();
        try
        {
            nonBlockingWrite( channel, headerBuf );
            IOUtil.setSendBufferSize( channel.socket(), length );
        }
        catch ( IncompleteIOException ioe )
        {
            logger.log( Level.FINEST, "Incomplete header write detected, registering for write again." );
            // ioe.setIOBuffer(null);

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     * @see de.netseeker.ejoe.io.DataChannel#writeHeader(de.netseeker.ejoe.ConnectionHeader, java.nio.ByteBuffer, long)
     */
    public void writeHeader( ConnectionHeader header, ByteBuffer buffer, long timeout ) throws IOException
    {
        ByteBuffer headerBuf = null;
        SocketChannel channel = header.getChannel();
        boolean noBuffer = (buffer == null);
        int length = !noBuffer ? buffer.limit() : 0;
        if ( !noBuffer ) buffer.mark();


        if ( header.isClient() )
        {
            HttpRequest request = new HttpRequest( header, (header.getAttachementInfo() != null) ? header
                    .getAttachementInfo().toString() : HttpRequest.HTTP_POST );
            if ( !noBuffer ) request.addData( buffer );
            headerBuf = request.toByteBuffer();
            if ( logger.isLoggable( Level.FINEST ) )
            {
                logger.log( Level.FINEST, "Preparing to write client request with " + headerBuf.limit() + " bytes:\n"
                        + IOUtil.decodeToString( headerBuf ) );
            }
        }
        else
        {
            HttpResponse response = new HttpResponse( header, (header.getAttachementInfo() != null) ? header
                    .getAttachementInfo().toString() : HttpResponse.HTTP_OK );
            if ( !noBuffer ) response.addData( buffer );
            headerBuf = response.toByteBuffer();
            if ( logger.isLoggable( Level.FINEST ) )
            {
                logger.log( Level.FINEST, "Preparing to write server response with " + headerBuf.limit() + " bytes:\n"
                        + IOUtil.decodeToString( headerBuf ) );
            }
        }


        try
        {
            semiBlockingWrite( channel, headerBuf, timeout );
            IOUtil.setSendBufferSize( channel.socket(), length );
        }
        catch ( IncompleteIOException ioe )
        {
            logger.log( Level.FINEST, "Incomplete header write detected, skip this request." );
            throw new IncompleteIOException( null, SelectionKey.OP_WRITE );

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  private static final marauroa.common.Logger logger = Log4J.getLogger(DisconnectHandler.class);


  private PlayerEntryContainer playerContainer = PlayerEntryContainer.getContainer();


  public void handleDelayedEvent(RPServerManager rpMan, Object data) {
    SocketChannel channel = (SocketChannel) data;


    playerContainer.getLock().requestWriteLock();


    PlayerEntry entry = playerContainer.get(channel);
    if (entry != null) {

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            //TODO:考虑是否抛出异常
          }
          
          if(sk.isAcceptable()) {
            
            SocketChannel sc = null;
            try {
            sc = this.ssChannel.accept();
            sc.configureBlocking(false);
          } catch (IOException e) {
            //TODO:记录下此异常
            e.printStackTrace();
          }

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   */
  public void handleDelayedEvent(RPServerManager rpMan, Object data) {
    LoadAllActiveCharactersCommand cmd = (LoadAllActiveCharactersCommand) data;
    Map<String, RPObject> characters = cmd.getCharacters();
    int clientid = cmd.getClientid();
    SocketChannel channel = cmd.getChannel();
    PlayerEntry entry = PlayerEntryContainer.getContainer().get(channel);


    // entry is null if the player has timed out during an extremely very long turn overflow
    if (entry != null) {
      entry.characterCounter = characters.keySet().size();

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  @Override
  public void process(Message message) {
    try {
      int clientid = message.getClientID();
      int protocolVersion = message.getProtocolVersion();
      SocketChannel channel = message.getSocketChannel();


      if (message instanceof MessageC2SCreateCharacter) {
        MessageC2SCreateCharacter msg = (MessageC2SCreateCharacter) message;


        RPObject template = msg.getTemplate();

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      return null;
    }


    long sessionId = acceptor.getNextSessionId();


    SocketChannel sc = SocketChannel.open();
    sc.configureBlocking(false);


    SocketAddress bindAddress = acceptor.getConfigure().getAddress();


    ClientIoSession session = new ClientIoSession(sessionId, sc, acceptor, bindAddress);

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  }


  
  //TODO:考虑是否加入异常抛出
  private void registerIoSessionNow(IoSessionImpl session) throws IOException {
    SocketChannel channel = session.getChannel();
    if(channel == null) {
      throw new Error("通道不能为空");
    }


    /*if(channel.isRegistered()) {
      throw new RuntimeException("此通道已经主册过");
    }*/


    
    channel.configureBlocking(false);                //设置为非阻塞
    
    if(session.getClass() == IoSessionImpl.class) {
      //注册
      SelectionKey selectKey = channel.register(selector, SelectionKey.OP_READ, session);  //向选择器注册通道


      session.setSelectionKey(selectKey);   //设置会话的选择键


      //session.setOwnerDispatcher(this);    //设置归属IO处理器


      this.onRegisterSession(session);
    }
    
    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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