We denote as Self-properties the control a system exerts on itself autonomically to achieve and maintain Quality-of-Service (QoS). Our focus is in external, non-intrusive approaches and in this paper we focus mainly timeliness objectives. The self-adaptation process must be guided by the specification of the desired qualities. In this paper we describe the design of a Contract-Broker (C-Broker) architecture for implementing Quality-of-Service features and Selfproperties. We also show how basic QoS features were implemented in C-Broker. Our approach involved dynamic XML specifications for required parameters.
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