Software Product Line Engineering Basics - Model-Driven and Software Product Line Engineering - page 26

rooms, staircases, doors, and windows. Thus, houses can have
different number of floors; floors can have different number of
rooms; rooms can have different number of windows or doors;
staircases connect the different floors in the house, and so on.
Therefore, the configuration of the architectural structure of
houses must be performed by building architects .
2.3.2.2. Smart-Home's facilities
We take into account the need for incorporating automation
facilities for houses that are independent to the house
structure.Byorthogonal,wemeanfacilitiesthataffectmultiple
structural entities. These facilities allow autonomous actions
according to the defined policies. Houses include electrical
and electronic devices such as automatic lights, electric
windows, security devices as alarms, and security systems for
authentication. These devices, and therefore their actuation,
are related to optional facilities that the designer has to select
and bind to other elements that already exist in the house. For
instance, the automatic lights can be bound to all rooms in the
house or the security alarm system can be bound only to the
main entrance door.
For this application example, we consider two groups of
facilities. The first group is related to access control facilities.
The second one is related to environmental control facilities:
- Access control. This facility group should insure that
only inhabitants and authorized visitors can enter into the
house. Two alternative options must be provided to control
the access of inhabitants: (1) keypad authentication and
(2) fingerprint authentication.
- Environmental control. This facility adds the capability
of measuring the indoor temperature and takes some
action according to pre-defined policies. Two alternative
options must be provided for environmental control:
(1) automatic windows and (2) air-conditioning. Automatic
windows must be automatically opened if the temperature
in a room rises above a certain threshold and closed if the