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A MetaArchitecture for QoS-Based Distributed Resource Management

Systems that provide distributed multimedia services are subject to constant evolution customizable middleware is required to effectively manage this change. In this paper we develop a meta-architectural framework for customizable QoS-based middleware using Actors, a model of concurrent active objects. Middleware services for resource management execute concurrently with each other and with application activities— scheduling, protocols providing security and reliability, load balancing and stream synchronization can therefore potentially interfere with each other. To ensure cost-effective QoS in distributed multimedia systems, safe composability of resource management services is essential. For instance, system protocols and activities must not cause arbitrary delays in the presence of timing based QoS constraints. Using TLAM, a semantic model for specifying and reasoning about components of open distributed systems, we show how a QoS brokerage service can be used to coordinate multimedia resource management services in a safe, flexible and efficient manner.