@Override
  public Channel read() {
    if (channelReadCallback != null) {
      channelReadCallback.onRead();
    } else {
      queuedOnReads++;
    }
    return this;
  }
Sets the {@link ChannelReadCallback}.
@param channelReadCallback the {@link ChannelReadCallback} that will executed on {@link #read()}.
ambry-rest/src/test/java/com/github/ambry/rest/NettyRequestTest.java