Robust pervasive computing applications today span heterogeneous systems and often need to be dynamic and adaptive. However, traditional, asynchronous distributed systems are generally too complex and require developers to be deeply aware of the intricacies of the underlying system and platform. Furthermore, building adaptive applications also proves difficult because traditional systems tend to impose a static API between distributed components. The interfaces are determined at compile-time and provide no mechanism for changing the relationships between components during runtime, such as to adapt to hardware upgrade or failure.
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