Even though many simulation frameworks for predicting performance in Grid systems have been implemented, real Grid middleware platforms lack of effective resource managers able to help them to dynamically make a decision about task placement. This paper proposes a broker architecture and its implementation for a hierarchical Grid system. The broker. whose logic is based on an economy-driven model, is able both to transparently split a sequential object-oriented application into tasks, according to the master/slave computing model, and to automatically distribute slave tasks to a set of computational resources selected so as to execute the application satisfying the QoS specified by the user. The goal is achieved by designing the broker with three patterns: Grid Broker, Reflection and Master/Slave.
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