11
V. Liberatore
Pervasive Computing
Why layering?
Dealing with
complex systems:
Explicit structure allows identification, relationship of complex system’s pieces
nLayered
reference model for discussion
Modularization eases maintenance, updating of system
nChange
of implementation of layer’s service transparent
to rest of system
nE.g., change in gate procedure doesn’t affect rest of system
Layering considered harmful?