An Event-B Model for On-Demand Streaming

As services and applications move away from the one-to-may relationship of the client-server model towards many-to-many relations such as cloud-based services and peer-to-peer networks, there is a need for a reusable model of how a node could work in such a network that transfers content between nodes. While distributed systems and in particular peer-to-peer technology has found success in file transfer use, on-demand media streaming has so far largely eluded this kind of decentralisation. In this paper we use the Event-B formalism to describe a structured formal model, from the more general node in a content transfer network to the more specific one of a peer-to-peer file sharing based content streaming.