code: @Override
      public void setBufferConfig(int bufferSize, boolean autoFlush) throws IOException {
  	this.bufferSize = bufferSize;
  	this.autoFlush = autoFlush;
  	_check();
      }
docs: reset configuration of buffer
  
  @param bufferSize size of the buffer
  @param autoFlush does the buffer autoflush
  @throws IOException