Discuss the issue of how the scope of an event system can and should be related to the physical
extent of a smart space in which it is used.
What will be an ideal response?
This is a ‘boundary principle’ question. Components in a hotel guest room probably don’t need to know (and
shouldn’t know) about events occurring in the guest room next door. However, certain hotel management
components hosted elsewhere in the building may have an interest.
One approach would be for events to be propagated by default only to components within the smart space. If
necessary, those events could also be relayed to components outside the smart space by a proxy component in
the smart space.
But how to ensure that propagation is physically limited in scope? The techniques introduced for physically
scoping asociation (Section 16.2.2) can all be applied to this case, too.
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