code: public static Log replay(Log source, Log destination) {
  		if (source instanceof DeferredLog) {
  			((DeferredLog) source).replayTo(destination);
  		}
  		return destination;
  	}
docs: Replay from a source log to a destination log when the source is deferred.
  @param source the source logger
  @param destination the destination logger
  @return the destination