Managing interaction concerns in Web-service systems

Abstract

Web services dramatically increase the reach of ebusiness. A homogeneous model that spans internal as well as external resources enables uniform solutions to complex business problems. Yet, the complexity of webservice-based systems increases exponentially with their scope. Separation of crosscutting concerns and active management of aspects are fundamental in web-servicebased solutions.In this paper, we first introduce web services and the concept of business interaction concerns. We then propose a process-oriented approach to the modelling of aspects deriving from crosscutting business concerns. We focus on the dynamic nature of web-service-based solutions, and the need for adaptive management of aspects. In particular, we propose a technique for the dynamic distribution of aspects across multiple webservice components. The technique is based on explicit definition of process roles.The proposed approach has been used to build experimental solutions involving dynamic reconfiguration of web-service system. We present an application example in the context of supply-chain integration that was prototyped using the DySCo platform (Dynamic e-Service Composer).

A Systematic Review and Assessment of Aspect-oriented Methods Applied to Business Process Adaptation

“…In other words, this is not a generic framework that can be used to improve the design of the process models, but rather execute already known alternative processes after detecting pre-defined situations. Composing and swapping services based on QoS, cost, rules, and in the event of failure [27] [24] [32] [34] Extracting roles and crosscutting concerns from composite services [37] Customizing process instances based on user profiles or SLAs [9] Adapting service composition and collaboration policies [5] [36] Using monitoring aspects to detect undesired situations Furthermore in [1], Algahtani and Zedan aim to solve several problems with service-based technologies using a combination of an event-driven architecture and aspect-oriented methods. The targeted problems are the lack of design-time adaptability, lack of testability for composition correctness, lack of behavioral features, and lack of runtime adaptability.…”

An architecture for developing aspect-oriented Web services

“…The use of the AOCE methodology to build our web services-based travel planner system resulted in increased understanding of the interrelationships between the various subsystems and components concerned [4], [10], [22]. Capturing cross-cutting concerns using AOCE for the travel planner services we found that the development process was considerably simplified.…”

“…Our novel AOWS architecture enabled us to achieve a higher level of characterization and modularization in our travel planner system than other conventional approaches [22], [23]. The use of the AOCE methodology to build our web services-based travel planner system resulted in increased understanding of the interrelationships between the various subsystems and components concerned [4], [10], [22].…”

“…Various web services-oriented compositional methods and techniques have been developed in recent times [7], [3], [22], [23]. Most of these focus on discovering or defining component interfaces and some focus on supporting specification of specific kinds of cross-cutting concerns.…”

Workflow: A Language for Composing Web Services

“…A second aspect of dynamic composition is the coordination of different web services [18]. The mainstream approach is to have a single entity responsible for coordination, hence the reference to coordination as orchestration.…”