code: public ChannelHandler[] getClientChannelHandlers() {
  		NetworkClientHandler networkClientHandler =
  			creditBasedEnabled ? new CreditBasedPartitionRequestClientHandler() :
  				new PartitionRequestClientHandler();
  		return new ChannelHandler[] {
  			messageEncoder,
  			new NettyMessage.NettyMessageDecoder(!creditBasedEnabled),
  			networkClientHandler};
  	}
docs: Returns the client channel handlers.
  
  <pre>
  +-----------+----------+            +----------------------+
  | Remote input channel |            | request client       |
  +-----------+----------+            +-----------+----------+
  |                                   | (1) write
  +---------------+-----------------------------------+---------------+
  |               |     CLIENT CHANNEL PIPELINE       |               |
  |               |                                  \|/              |
  |    +----------+----------+            +----------------------+    |
  |    | Request handler     +            | Message encoder      |    |
  |    +----------+----------+            +-----------+----------+    |
  |              /|\                                 \|/              |
  |               |                                   |               |
  |    +----------+------------+                      |               |
  |    | Message+Frame decoder |                      |               |
  |    +----------+------------+                      |               |
  |              /|\                                  |               |
  +---------------+-----------------------------------+---------------+
  |               | (3) server response              \|/ (2) client request
  +---------------+-----------------------------------+---------------+
  |               |                                   |               |
  |       [ Socket.read() ]                    [ Socket.write() ]     |
  |                                                                   |
  |  Netty Internal I/O Threads (Transport Implementation)            |
  +-------------------------------------------------------------------+
  </pre>
  
  @return channel handlers