void setChannelReadCallback(ChannelReadCallback channelReadCallback) {
    this.channelReadCallback = channelReadCallback;
    for (; queuedOnReads > 0; queuedOnReads--) {
      channelReadCallback.onRead();
    }
  }
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