Type of Document Dissertation Author Deng, Gan Author's Email Address email@example.com URN etd-12052007-135016 Title Deployment and configuration of component-based distributed, real-time and embedded systems Degree PhD Department Computer Science Advisory Committee
Advisor Name Title Douglas C. Schmidt Committee Chair Aniruddha Gokhale Committee Member Gabor Karsai Committee Member Janos Sztipanovits Committee Member Jeff Gray Committee Member Keywords
- Software configuration management
- Embedded computer systems -- Programming
- Distributed Real-time Embedded Systems
- Component Middleware
- Deployment and Configuration
- Computer software -- Quality control
Date of Defense 2007-12-11 Availability unrestricted AbstractComponent-based software engineering (CBSE) is increasingly being adopted for large-scale software systems, particularly for large-scale distributed real-time and embedded (DRE) systems. One of the most challenging -- and often most neglected -- problems in CBSE for large-scale DRE systems is the system deployment and configuration (D&C) process, where the increasing heterogeneity and versatility of application domains requires support for an unprecedented level of configurability and adaptability. Existing D&C middleware technologies suffer from three major challenges: (1) insufficient ability to evolve in the face of quality of service (QoS) diversification due to the interaction with systemic concerns imposed by a wide range of application requirements, (2) complexities of integrating, configuring and deploying different real-time publish/subscribe services in QoS-enabled component middleware, and (3) ensuring the predictability of D&C in the face of complex dependency relationships among components in large scale DRE systems.
This dissertation provides three contributions to the D&C middleware research for large-scale component-based DRE systems. First, we describe the design and implementation of Deployment And Configuration Engine (DAnCE), which is QoS-enabled component D&C framework that alleviates key inherent and accidental complexities for automated D&C of component-based DRE systems. Our results show that DAnCE provides an effective platform for deploying DRE system components using a standard runtime environment and metadata. Second, we evaluate different architectural design choices for integrating, configuring, and deploying publish/subscribe services in component middleware for DRE systems, and develop a combined solution approach based on a pattern language and model-driven engineering (MDE) technique. Our results reveal that both the performance and scalability of our design and implementation are comparable to its object-oriented counterpart, which provides a key guidance to the suitability of component technologies for DRE systems. Third, we describe how we identify key sources of deployment-time priority inversion and how we apply a multi-graph based algorithm called PARIGE to avoid deployment priority inversion. Our results show that PARIGE incurs negligible ~1% D&C performance overhead and avoids unbounded deployment time priority inversion when operational strings with different priorities have dependencies among each other, thereby significantly improving the responsiveness of high priority mission-critical tasks.
The results presented in the dissertation show that the capabilities provided by the DAnCE framework -- combined with its associated component middleware infrastructure and MDE tools – significantly improves the reusability of components and the productivity of D&C process of component-based DRE systems compared to conventional D&C approaches. Moreover, the PARIGE algorithm in DAnCE significantly improves the predictability of D&C of large-scale component-based DRE systems than conventional D&C QoS assurance techniques.
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