Relation of Runtime Software Architecture Based on Design Hierarchy between Adjacent Layers

摘要

On line system is hard to evolve dynamically because its runtime SA (Software Architecture) exists implicitly. A model of runtime SA is based on design hierarchy is described in this paper. In the model, runtime SA is expressed explicitly as a first-class entity. The separation between abstract SA of meta-layer and physical SA of base-layer provides users with an architecture view in different abstract levels and managing tools, thereby it supports the reuse of software framework and component when system is running, for better system flexibility and extensibility. Further more, topology relation and calculation semantic relation between software architecture of adjacent layers are analyzed. Through the operation provided by meta-object, the reconstruction of runtime SA is implemented and system evolution can be managed and controlled effectively.