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Companies offering software services to external customer organizations must ensure that the non-functional requirements of all these customer organizations are satisfied. However, in such a cross-organizational context where services are provided and consumed by different organizations, the implementation of features, for example security, is scattered across the services of the different organizations and cannot be condensed into a single module that is applicable to multiple services. In this paper we present an aspect-based coordination architecture for dynamic composition of cross-organizational features in distributed software systems such as systems of systems or service supply chains. The underlying approach of this architecture is to specify the features at a higher level that abstracts the internal mechanism of the organizations involved. A coordination middleware dynamically integrates the appropriate features into the service composition, driven by metadata-based user preferences. [ABSTRACT FROM AUTHOR]

Software systems evolvability is more and more required in current software developments, in order to provide systems with enough flexibility to adapt to future requirements. The evolvability in the field of Software Architecture can be classified into two kinds: dynamic reconfiguration or dynamic architectural type evolution. The former enables an architecture to change its configuration at run-time, by creating or destroying architectural element instances and their links dynamically. The latter enables an architecture to change entirely its specification at run-time, by introducing new architectural element types and connections or by modifying the type and the running instances of its architectural elements. This paper presents an approach to address how to dynamically evolve the architectural types of a system from a platform-independent view. This approach identifies the different concerns involved in the adaptation process by encapsulating them into aspects, and makes use of reflection mechanisms to perform the type updating process. [ABSTRACT FROM AUTHOR]