code: public void notifyRecordIsAvailable(int channelIndex) {
  		this.availableChannels.add(Integer.valueOf(channelIndex));
  
  		RecordAvailabilityListener<T> listener = this.recordAvailabilityListener.get();
  		if (listener != null) {
  			listener.reportRecordAvailability(this);
  		}
  	}
docs: Notify the gate that the channel with the given index has
  at least one record available.
  
  @param channelIndex
  the index of the channel which has at least one record available