An architecture-based dynamic adaptation model and framework for adaptive software systems

This paper describes an architecture-based dynamic adaptation model and framework for adaptive software systems. The framework provides for a reusable adaptation infrastructure and uses a layered architecture pattern. It also provides separation of concerns from the system's software architecture and supports internal state information checkpointing and restoration. Any dynamic software adaptation process, whether instigated internally or externally, makes runtime changes only to affected components. The dynamic adaptation model separates adaptation-impacted parts of a system from those that need not be concerned with the dynamic adaptation.