Web Services Dependability

Web Services Dependability

Michael C. Jaeger (Berlin University of Technology, Germany) and Matthias Werner (Operating Systems Group, TU Chemnitz, Germany)
Copyright: © 2009 |Pages: 17
DOI: 10.4018/978-1-60566-042-4.ch007
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Abstract

This chapter presents the definition of relevant terminology and a conceptual model of the basic terms. The chapter starts with the presentation of research in the area of dependability. Based on this, Web service concepts related to the dependability are introduced. The presentation leads into a statement identifying individual quality-of-service (QoS) characteristics for forming dependable Web services. Then, the chapter discusses the current status quo in the area of QoS-aware Web services. This part is divided into three subparts: description, management, and monitoring. This also identifies ongoing efforts as well as efforts that do not show present activity. By this discussion, this chapter puts research about dependability in relation with ongoing QoS-related efforts in the Web services domain. Thus it identifies how these efforts can be combined in order to form a dependable Web services platform.
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Introduction

The Web services as an implementation of the service oriented architecture (SOA) represents a trend in the IT industry for the development of a flexible and unifying software infrastructure. Picking up the Web services idea, software components provide their functionality as a service by using uniform interface description and invocation protocols using XML formats and Internet communication protocols.

One important characteristic in an open, distributed system is that services can appear, disappear, and bound dynamically at run time. The deployment and use of Web services also results in a varying level of quality. The access to Web services can involve the Internet and thus relies, as mentioned above, on its protocols. As the Web pages in the Internet, Web services are provided on a best-effort basis as well. Indeed, Internet protocols are known for their robustness. However, they do not guarantee that a connection can be established and can be held at given characteristics. Thus, for some soft real-time applications such as telephony or brokering stocks, reservation and signalling extensions to the Internet protocols are used, making Web services more reliable. In addition, the basic SOA idea of a loosely coupled provision of services, which also applies to Web services, forms also a problem. The binding of services leaves generally open what time it takes to find a service, to bind a service, and how reliable the service execution will perform. Thus, the use of loose-coupling mechanisms poses a problem regarding a satisfactory overall performance.

These quality of service (QoS) issues with Web services are well known. Thus, several recent developments and approaches have been proposed that extend the Web services with individual attributes, such as security, integrity, reliability, availability, and further characteristics. Today, a large number of proposals and efforts exist that provide research on description formats for QoS-aware Web services (e.g., Tosic, Patel, & Pagurek, 2002; Ludwig, Keller, Dan, King, & Franck, 2003; Ran 2003; Zhou, Chia, & Lee, 2004), a management infrastructure (e.g., Sahai et al., 2002; Wang, Chen, Wang, Fung, & Uczekaj, 2004), and monitoring approaches (e.g., Baresi, Guinea, & Plebani, 2005; Sahai et al., 2002; Tosic, Ma, Pagurek, & Esfandiari, 2004). In the recent years, standards and recommendations from nonprofit organisations have also emerged to form a community-wide consensus for establishing reliable Web services (e.g., WS-reliability) (OASIS, 2004). In summary, the different QoS issues have already been extensively covered in the Web services domain.

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Table of Contents
Foreword
Torbjørn Skramstad
Preface
Khaled M. Khan
Acknowledgment
Khaled M. Khan
Chapter 1
Ghita Kouadri Mostefaoui
The ultimate effectiveness in terms of quality achievements should be a key concern of systems built from Web services. To this end, in this chapter... Sample PDF
The Development, Testing, and Deployment of a Web Services Infrastructure for Distributed Healthcare Delivery, Research, and Training
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Chapter 2
Abdelghani Benharref, Mohamed Adel Serhani, Mohamed Salem, Rachida Dssouli
Web services are a new breed of applications that endorse large support from main vendors from industry as well as academia. As the Web services... Sample PDF
Multi-Tier Framework for Management of Web Services' Quality
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Chapter 3
Krishna Ratakonda
In this chapter we present an overview of research and development efforts across several different technical communities aimed at enabling... Sample PDF
Quality Models for Multimedia Delivery in a Services Oriented Architecture
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Chapter 4
Julio Fernández Vilas
Several open issues in Web services architecture are being solved by using different kinds of solutions. Standard high-availability techniques based... Sample PDF
Virtual Web Services: Extension Architecture to Alleviate Open Problems in Web Services Technology
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Chapter 5
Witold Abramowicz
The following chapter focuses on the problem of the proper definition of non-functional properties and methods that may be applied in order to... Sample PDF
Profiling of Web Services to Measure and Verify their Non-Functional Properties
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Chapter 6
Kyriakos Kritikos
As the Web service (WS) paradigm gains popularity for its promise to transform the way business is conducted, the number of deployed WSs grows with... Sample PDF
Enhancing the Web Service Description and Discovery Processes with QoS
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Chapter 7
Michael C. Jaeger, Matthias Werner
This chapter presents the definition of relevant terminology and a conceptual model of the basic terms. The chapter starts with the presentation of... Sample PDF
Web Services Dependability
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Chapter 8
Frederic Montagut, Refik Molva, Silvan Tecumseh Golega
Composite applications leveraging the functionalities offered by Web services are today the underpinnings of enterprise computing. However, current... Sample PDF
Transactional Composite Applications
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Chapter 9
Enrico Pontelli, Tran Cao Son, Chitta Baral
This chapter presents a comprehensive logic programming framework designed to support intelligent composition of Web services. The underlying model... Sample PDF
A Logic Programming Based Framework for Intelligent Web Service Composition
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Chapter 10
Daniel Brenner, Barbara Paech, Matthias Merdes, Rainer Malaka
For the foreseeable future, testing will remain the mainstay of software quality assurance and measurement in all areas of software development... Sample PDF
Enhancing the Testability of Web Services
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Chapter 11
Ghita Kouadri Mostefaoui, Zakaria Maamar, Nanjangud C. Narendra
This chapter presents our research initiative known as aspect-oriented framework for Web services (AoF4WS). This initiative looks into the role of... Sample PDF
Aspect-Oriented Framework for Web Services (AoF4WS): Introduction and Two Example Case Studies
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Chapter 12
Ty Mey Eap, Marek Hatala, Dragan Gaševic, Nima Kaviani, Ratko Spasojevic
The lack of intrinsic and user control in the identity management of today Internet security hampers the research in the area of Semantic Web and... Sample PDF
Open Security Framework for Unleashing Semantic Web Services
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Chapter 13
Vishal Dwivedi
This chapter underlines the importance of security service level agreements (SLAs) for Web services. As Web services are increasingly incorporated... Sample PDF
Providing Web Services Security SLA Guarantees: Issues and Approaches
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Chapter 14
Fatih Oguz
This chapter describes a research study with an objective to explore and describe decision factors related to technology adoption. The study... Sample PDF
Adoption of Web Services in Digital Libraries: An Exploratory Study
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Chapter 15
Bijoy Majumdar
Change is the only constant, and this concept holds good for services too. Service maintenance is the most tedious and longest phase of service... Sample PDF
Service Evolution and Maintainability
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Chapter 16
Pauline Ratnasingam
This chapter aims to examine the extent of Web services usage and quality, applying the balanced scorecard methodology in a small business firm as... Sample PDF
The Role of Web Services: A Balance Scorecard Perspective
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