public List<OpenChatRoomDTO> getOpenChatRooms() {
		List<OpenChatRoomDTO> openchatroomDTOs = new ArrayList<OpenChatRoomDTO>();
		List<Openchatroom> openchatrooms = new OpenchatroomDAO().readAll();
		int participantsCounter = 0;
		String currentPerformer = null;
		for (Openchatroom openchatroom : openchatrooms) {
			if (! openchatroom.getUserName().equals(currentPerformer)) {
				if (currentPerformer != null) {
					OpenChatRoomDTO openChatRoomDTO = new OpenChatRoomDTO();
					openChatRoomDTO.setPerformer(currentPerformer);
					openChatRoomDTO.setNumberOfParticipants(participantsCounter);
					openchatroomDTOs.add(openChatRoomDTO);
				}
				currentPerformer = openchatroom.getUserName();
				participantsCounter = 1;
			} else {
				participantsCounter++;
			}
		}
		if (currentPerformer != null) {
			OpenChatRoomDTO openChatRoomDTO = new OpenChatRoomDTO();
			openChatRoomDTO.setPerformer(currentPerformer);
			openChatRoomDTO.setNumberOfParticipants(participantsCounter);
			openchatroomDTOs.add(openChatRoomDTO);
		}
		return openchatroomDTOs;
	}