javanio中的缓冲写入/发送消息问题

我的问题是关于javanio客户机-服务器消息传递,我不确定从技术上定义问题,但是: 缓冲区似乎正在缓存数据,当缓存完成后,它将所有数据一起发送,这是令人不安的逻辑:

private void sendCreate(String line,SocketChannel from)
 /* A new client wishes to join the world.

      This requires the client to find out about the existing
      clients, and to add itself to the other clients' worlds.

      Message format: create name xPosn zPosn

      Store the user's name, extracted from the "create" message
  */
 { StringTokenizer st = new StringTokenizer(line);
 st.nextToken();                  // skip 'create' word
 userName = st.nextToken();
 String xPosn = st.nextToken();   // don't parse
 String zPosn = st.nextToken();   // don't parse

 // request details from other clients
 sendBroadcastMessage( "wantDetails " + achannel.socket().getInetAddress() + " " + port,from);

 // tell other clients about the new one
 sendBroadcastMessage( "create " + userName + " "+xPosn+" "+zPosn,from);

 } // end of sendCreate()

负责从服务器广播消息的方法:

private void sendBroadcastMessage(String mesg, SocketChannel from) {
  prepWriteBuffer(mesg);
  Iterator i = clients.iterator();
  while (i.hasNext()) {
   SocketChannel channel = (SocketChannel) i.next();
   if (channel != from)
    channelWrite(channel, writeBuffer);
  }
 }

我假设这应该发送第一条消息,即sendBroadcastmessage(“wantDetails”+achannel.socket().getInetAddress()+“”+port,from);但这不是,它似乎正在等待其他方法调用,即sendBroadcastmessage(“create”+username+“”+xposn+“”+zposn,from);然后将这两条消息作为一条消息发送,这是影响应用程序逻辑。理想情况下,它应该或应该在第一次调用sendBroadcastmessage之后发送第一条消息,然后在客户端接收到第一个调用时处理其他调用。

以下是sendBroadcastMessage()中使用的方法:

private void prepWriteBuffer(String mesg) {
  // fills the buffer from the given string
  // and prepares it for a channel write
  writeBuffer.clear();
  writeBuffer.put(mesg.getBytes());
  writeBuffer.putChar('\n');
  writeBuffer.flip();
 }

 private void channelWrite(SocketChannel channel, ByteBuffer writeBuffer) {
  long nbytes = 0;
  long toWrite = writeBuffer.remaining();

  // loop on the channel.write() call since it will not necessarily
  // write all bytes in one shot
  try {
    nbytes += channel.write(writeBuffer);

  } catch (ClosedChannelException cce) {
   cce.printStackTrace();
  } catch (Exception e) {
   e.printStackTrace();
  }
  // get ready for another write if needed
  writeBuffer.rewind();
 }

请提出一些解决方案。

谢谢,

吉比拉拉

编辑: 这个呢,我从一些聊天应用程序得到了这个补丁:

private void prepWriteBuffer(String mesg) {
        // fills the buffer from the given string
        // and prepares it for a channel write
        writeBuffer.clear();
        writeBuffer.put(mesg.getBytes());
        writeBuffer.putChar('\n');
        writeBuffer.flip();
    }


// called needs to remove the channel if it fails, otherwise it will fail forever.
        private void channelWrite(SocketChannel channel, ByteBuffer writeBuffer)  {    
            long nbytes = 0;
            long toWrite = writeBuffer.remaining();
            // loop on the channel.write() call since it will not necessarily
            // write all bytes in one shot
            try {
            while (nbytes != toWrite) {
                nbytes += channel.write(writeBuffer);

                try {
                    Thread.sleep(CHANNEL_WRITE_SLEEP);
                } catch (InterruptedException e) {
                }
            }
        } catch (ClosedChannelException cce) {
        } catch (Exception e) {
        }
        // get ready for another write if needed
        writeBuffer.rewind();
    }