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Automatic web-service composition aims at automating the design of an appropriate combination of existing web services to achieve a global goal. Most proposed AWSC approaches only consider input/output parameters and quality features of services. However, most real-world web services have applicable conditions and require constraints to be considered according to the execution context of composite services. Constraint verification has a significant impact on the composition and execution of composite services. In particular, runtime verification of service constraints can result in the failure of the execution of composite services and eventually waste computational resources and may incur monetary costs. In addition, traditional adaptation approaches for web service composition consider recovery in case of failure when a service becomes unavailable. They do not take into account changes and limitations in service execution environment which potentially can affect the execution of a wide range of services. Externally-defined constraints are likely to be defined and become or cease to be applicable after the composite service has been deployed. In this thesis, we propose a novel approach to model and verify different types of constraints inside composite services. We not only consider input/output parameters but also the values that can be assigned to parameters during design and execution of composite services. In addition, we provide novel failure recovery and adaptation approaches for different types of constraints according to the execution context of composite services. In our solution, we develop a new structure including alternative composite services to recover broken composite services and adapt to external constraints. We finally propose a brokerage architecture including all proposed approaches for constraint-aware service composition and adaptation.
Web services provide systems with great flexibility and easier maintenance which result in better ways to communicate and distribute applications. There are good procedures in place for the design, development, and management of Web services; however, there are areas in which Web service adaptation is required. To preserve the loosely coupled approach of Web services, service adaptations should be implemented appropriately. Adaptive Web Services for Modular and Reusable Software Development: Tactics and Solutions includes current research on the area of Web service adaptation while embarking upon the different aspects related to Web services. This collection provides an overview of existing solutions for service adaption in different development scopes as well as covers a wide variety of challenges which emerge. It aims to keep industry professionals as well as academic researchers up to date with the latest research results.
With recent advances in radio-frequency identification (RFID) technology, sensor networks, and enhanced Web services, the original World Wide Web is continuing its evolution into what is being called the Web of Things and Services. Such a Web will support an ultimately interactive environment where everyday physical objects such as buildings, sidew
The advent of Web service technologies in the paradigm of Service oriented architecture (SOA) enables dynamic and flexible interoperation of distributed business processes within and across organization boundaries. One of the challenges in working with heterogeneous and autonomous Web services is the need to ensure their interoperability and compatibility. The typical approach for enabling incompatible services to interact is service adaptation. The need for adaptation in Web services comes from the heterogeneity at the levels of service interface and business protocol. The service interface incompatibilities include service signature mismatches (e.g., message and operation name, number; the type of input/output message parameters of operations; and the parameter value constraint). The mismatches at the business protocol (or service behavior) level arise from the order constraints that services impose on messages exchanges (e.g., deadlock where both partner services are mutually waiting to receive some message from the other, and unspecified reception in which one service sends a message while the partner is not expecting it). In service interaction through adaptation, an adapter mediates the interactions between two services with potentially different interfaces and business protocols such that the interoperability is achieved, i.e., adapter compensates for the differences between their interfaces by data mappings, and between their business protocols by rearranging the messages exchanges or generating a missing message. In this dissertation, we focus on how to cope with the dynamic evolution of business protocol P of a given service (i.e., P is changed to P') that is adapted by an adapter in the context of service interaction. Web service specifications constantly evolve. For variety of reasons, service providers may change their business protocols. Therefore, it is important to understand the potential impacts of the changes arising from the evolution of service business protocol on the adapter.We present an approach to automatically detect the effects of business protocols evolution on the adapter and, if possible, to suggest fixes to update the specification of adapter on-the-fly. Besides, we propose a technique to verify the correctness of new adapter which is dynamically re-configured. Finally, we describe a prototype tool where experimentations show the benefits of proposed approach in terms of time and cost compared to the static methods aiming for complete regeneration of adapter or manual inspection and adaption of the adapter with respect to changes in the business protocols.
This book constitutes the refereed proceedings of the 5th European Conference on Software Architecture, ECSA 2011, held in Essen, Germany, in September 2011. The 13 revised full papers presented together with 24 emerging research papers, and 7 research challenge poster papers were carefully reviewed and selected from over 100 submissions. The papers are organized in topical sections on requirements and software architectures; software architecture, components, and compositions; quality attributes and software architectures; software product line architectures; architectural models, patterns and styles; short papers; process and management of architectural decisions; software architecture run-time aspects; ADLs and metamodels; and services and software architectures.
Web services and Service-Oriented Computing (SOC) have become thriving areas of academic research, joint university/industry research projects, and novel IT products on the market. SOC is the computing paradigm that uses Web services as building blocks for the engineering of composite, distributed applications out of the reusable application logic encapsulated by Web services. Web services could be considered the best-known and most standardized technology in use today for distributed computing over the Internet. This book is the second installment of a two-book collection covering the state-of-the-art of both theoretical and practical aspects of Web services and SOC research and deployments. Advanced Web Services specifically focuses on advanced topics of Web services and SOC and covers topics including Web services transactions, security and trust, Web service management, real-world case studies, and novel perspectives and future directions. The editors present foundational topics in the first book of the collection, Web Services Foundations (Springer, 2013). Together, both books comprise approximately 1400 pages and are the result of an enormous community effort that involved more than 100 authors, comprising the world’s leading experts in this field.
The modern world has made available a wealth of new possibilities for interacting with computers, through advanced Web applications, while on the go with handheld smart telephones or using electronic tabletops or wall-sized displays. Developers of modern interactive systems face great problems: how to design applications which will work well with newly available technologies, and how to efficiently and correctly implement such designs. Design, Specification and Verification of Interactive Systems 2008 was the 15th of a series of annual workshops devoted to helping designers and implementers of interactive systems unleash the power of modern interaction devices and techniques. DSV-IS 2008 was held at Queen’s University in Kingston, Canada, during July 16–18, 2008. This book collects the best papers submitted to the workshop. There were 17 full papers, 10 late-breaking and experience report papers, and two demonstrations. Keynote presentations were provided by Judy Brown of Carleton University and Randy Ellis of Queen’s University. The first day of the workshop addressed the problems of user interface evaluation and specification, with particular emphasis on the use of task models to provide hi- level approaches for capturing the intended functionality of a user interface. Day two continued this theme, examining techniques for modeling user interfaces, particularly for mobile and ubiquitous applications. Presenters also discussed advanced implem- tation techniques for interactive systems. Finally, day three considered how to arc- tect interactive systems, and returned to the themes of evaluation and specification.
Over the past 20 years, software architectures have significantly contributed to the development of complex and distributed systems. Nowadays, it is recognized that one of the critical problems in the design and development of any complex software system is its architecture, i.e. the organization of its architectural elements. Software Architecture presents the software architecture paradigms based on objects, components, services and models, as well as the various architectural techniques and methods, the analysis of architectural qualities, models of representation of architectural templates and styles, their formalization, validation and testing and finally the engineering approach in which these consistent and autonomous elements can be tackled.
"This book provides a comprehensive assessment of the latest developments in Web services research, focusing on composing and coordinating Web services, XML security, and service oriented architecture, and presenting new and emerging research in the Web services discipline"--Provided by publisher.
Researchers and professionals