SYNCHRONIZATION ABSTRACTIONS
- Two basic abstractions: ``activation sources'' and ``activation filters''
- Activation sources:
- logical clocks,
- pass LOGICAL-TIME VALUES to activated objects,
- synchronize activations with PHYSICAL time-lines.
- pass synchronization delay indications.
- Activation filters:
- distribute activations flows among objects,
- offer ``parallel'' and ``sequence'' activation semantics.
- Live objects implement quality-management policies.
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