IEEE Distributed Systems Online

Architectural Constraints in the Model-Driven Development of Self-Adaptive Applications

In component-based software development, a composition of connected components represents a software system's architecture. This component framework supports adaptation through application variability. The adaptation decision is made at runtime by resolving the variation points and computing the utility of all application variants. Following the application variability model, a huge number of application variants may arise, many of which are not feasible in reality. Architectural constraints may be applied to filter out such infeasible variants before checking their utilities. This article presents an approach to specify architectural constraints while following a model-driven development approach.

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Distributed Computing Education, Part 2: International Summer Schools

In 2003, the distributed computing community began the International Summer Schools in Grid Computing series (www.iceage-eu.org/issgc08/index.cfm), now in its sixth year. These schools aim to bring together leading experts and practitioners in the field with selected international students, who will return to their home communities to pass their knowledge and enthusiasm on to others. The second installment of this department presents curriculum details and the results of the students' assessments of the school.

Software-as-a-Service: The Spark That Will Change Software Engineering?

In the past year, SaaS has emerged from its pioneering group of start-ups and medium-sized vendors delivering software on demand to be embraced by software giants such as Oracle and SAP. Some veteran technologists and industry analysts also see SaaS as a catalyst for more interactive, iterative software development.