An Architecture of Cyber Physical System Based on Service

A CPS is defined as integration of computation and physical processes. In cps, downsized and embedded devices execute physical processes by monitoring and controlling entities in the physical world. Service-oriented architecture (SOA) provides the concept of packaging available functionalities as interoperable services. Services can be used to construct applications. But, in the context of cyber-physical systems, there are special characteristics and requirements. For example, physical entities are exclusive, but services can be used by several consumers at the same time through multi-threading. Lots of applications are Safety-Critical in cyber-physical systems. Taking all these characteristics and requirements into consideration, this paper introduce application rebuild framework and lease protocol into cyber-physical systems. The atomicity property of lease protocol guarantees that an application either is granted the leases for all requested services or it gets no lease at all. Applications which aren't granted the leases for all requested services will be rebuilt by application rebuild framework to ensure applications will be started in time. The architecture of cyber-physical systems proposed by this paper can improve the availability and adaptability of application. A prototype system is implemented to show the practicability of the architecture of cyber-physical systems.