This paper describes an approach to designing COTS (Commercial off-the-Shelf) components-based software system in which each COTS component is self-managed by a wrapper to improve dependability of systems. The wrapper for self-managing a COTS component detects the anomalies of the component; it reconfigures the anomalous component at run-time; and it repairs the anomalous component. The wrappers co-operate eachother to reconfigure COTS components, so that they make the system more reliable. The approach suggested in this paper is applied to the distributed elevator system with multiple elevators.
This paper describes an approach to detecting anomalies in a software architectural style that is structured with components and connectors between the components. Each component is designed with tasks (concurrent or active objects), connectors between tasks, and passive objects accessed by tasks. Anomalies in the software architecture are detected twofold by each Component Monitor, which supervises objects in a component, and by a System Monitor, which monitors message communications between components. The monitors encapsulate the specifications of objects being monitored, which are represented using statecharts. The execution of statecharts in the monitors depends on notification messages from connectors between tasks, passive objects accessed by tasks in a component, and connectors between components.
This paper describes an approach to the design of a wrapper for self-managing COTS (commercial off-the-shelf) components. Each wrapper for COTS components encapsulates the properties of self-management — detection, reconfiguration, and repair. A COTS component deals with the application perspectives, whereas the wrapper handles the self-management perspectives, separately from the application perspectives. Each wrapper for self-managing COTS components is structured into several objects in support of detection, reconfiguration, and repair of the anomalous COTS components. The approach suggested in this paper is applied to the distributed elevator system consisting of multiple COTS components.
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