Abstract
Quality of service implementations, such as security and reliability, are notoriously difficult for software engineers. They have fragmented, cross-cutting implementations, with elements required in application components on both client and server sides. Heterogeniety and distribution make things even more difficult. To cap it all, precise requirements, specially for security, are often deployment-specific. DADO is a new programming model, with roots in aspect-oriented programming, that aims to improve matters. The goal of DADO is to provide a CORBA-like programming model to the developers of distributed, heterogenous QoS features. DADO comprises a modeling language, a deployment language, code generators, and a run-time environment. DADO allows QoS features to be modeled at the IDL level. Communication between QoS elements is explicitly modeled, as is the interaction between QoS elements and applications (viz., advice). Model-driven code-generation handles the mundane details of marshaling, despatch, and heterogeniety. DADO has a separate deployment language that allows QoS services to be deployed against applications. The DADO run-time also has several interesting features: clients can dynamically respond to QoS features at the server by deploying matching client-side service elements at run-time. DADO supports various interception mechanisms, such as proxies, interceptors, and code transformation, and all mechanisms are inter-operable. DADO currently works on TAO and JacORB, and supports QoS implementations in both Java and C++.
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Wohlstadter, E.A., Devanbu, P.T. (2003). DADO: A Novel Programming Model for Distributed, Heterogenous, Late-Bound QoS Implementations. In: Meersman, R., Tari, Z. (eds) On The Move to Meaningful Internet Systems 2003: OTM 2003 Workshops. OTM 2003. Lecture Notes in Computer Science, vol 2889. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-39962-9_90
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DOI: https://doi.org/10.1007/978-3-540-39962-9_90
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