case NewComment:
Integer signalIdForComment = (Integer)request.get(Parameter.SignalId);
String comment = (String)request.get(Parameter.Commentary);
String previousComment = system.newComment(signalIdForComment,comment);
return new SimulatedResponseNewComment(OK,signalIdForComment,previousComment);
case AllSystems: //lookup the systems here
throw new UnsupportedOperationException("Not implemented at this time");