SC-WS

2014 ◽  
Vol 4 (2) ◽  
pp. 31-44
Author(s):  
Ghita Kouadri Mostefaoui ◽  
Zakaria Maamar ◽  
Nanjangud C. Narendra
Keyword(s):  
Web Services ◽  
Web Service ◽  
Self Healing ◽  
Business Logic ◽  
Aspect Oriented Programming ◽  
Security Concerns ◽  
Oriented Approach ◽  
The Web

This paper discusses Aspect-Oriented Programming (AOP) as an efficient way to handle security concerns in Web services. Without AOP, the necessary security code would be mixed with the business logic that a Web service implements. This renders the maintenance of both code and business logic tedious and prone to errors. AOP allows confining codes of non-functional concerns like security and self-healing into specific modules so that they do not cross-cut with the Web service's business logic. The proposed aspect-oriented approach in this paper is built upon three levels referred to as user, component, and resource, and adopts three types of context, one context per level. The contexts contain various details on the environment of Web services, which permits activating the necessary aspects in response to these details. A set of experiments validating this approach are also reported in this paper.

Addressing Device-Based Adaptation of Services

2012 ◽  
pp. 278-301
Author(s):  
Achilleas Achilleos ◽  
Kun Yang ◽  
George A. Papadopoulos
Keyword(s):  
Web Services ◽  
Web Service ◽  
Mobile Devices ◽  
Rapid Growth ◽  
Description Language ◽  
Design And Development ◽  
Model Driven ◽  
Service Oriented ◽  
Oriented Approach ◽  
The Web

The rapid growth of the mobile devices market and the increasing requirements of mobile users augment the need to develop Web Service clients that could be deployed and run on both mobile and desktop devices. Different developers attempt to address this heterogeneity requirement and provide solutions that simplify and automate the development of device-aware services. This chapter proposes a Model-Driven Web Service oriented approach, which allows designing and automatically generating mobile and desktop-based clients that are able to invoke ubiquitously Web Services from different devices. This is further enabled via the Web Services Description Language that allows generating the required proxy classes, which support the communication with platform-specific clients. The applicability and efficiency of the approach is demonstrated via the design and development of a device-aware Web Service prototype.

Addressing Device-Based Adaptation of Services

2015 ◽  
pp. 624-647
Author(s):  
Achilleas P. Achilleos ◽  
Kun Yang ◽  
George A. Papadopoulos
Keyword(s):  
Web Services ◽  
Web Service ◽  
Mobile Devices ◽  
Rapid Growth ◽  
Description Language ◽  
Design And Development ◽  
Model Driven ◽  
Service Oriented ◽  
Oriented Approach ◽  
The Web

The rapid growth of the mobile devices market and the increasing requirements of mobile users augment the need to develop Web Service clients that could be deployed and run on both mobile and desktop devices. Different developers attempt to address this heterogeneity requirement and provide solutions that simplify and automate the development of device-aware services. This chapter proposes a Model-Driven Web Service oriented approach, which allows designing and automatically generating mobile and desktop-based clients that are able to invoke ubiquitously Web Services from different devices. This is further enabled via the Web Services Description Language that allows generating the required proxy classes, which support the communication with platform-specific clients. The applicability and efficiency of the approach is demonstrated via the design and development of a device-aware Web Service prototype.

scholarly journals Contracts for Cooperation between Web Service Programmers and HTML Designers

2003 ◽  
Vol 10 (38) ◽  
Author(s):  
Henning Böttger ◽  
Anders Møller ◽  
Michael I. Schwartzbach
Keyword(s):  
Web Services ◽  
Web Service ◽  
Tool Support ◽  
Separation Of Concerns ◽  
Business Logic ◽  
Program Code ◽  
The Web

Interactive Web services consist of a mixture of HTML fragments and program code. The fragments, which are maintained by designers, are combined to form HTML pages that are shown to the clients. The code, which is maintained by programmers, is executed on the server to handle the business logic. Current Web service frameworks provide little help in separating these constituents, which complicates cooperation between programmers and HTML designers.<br /> <br />We propose a system based on XML templates and formalized contracts allowing a flexible separation of concerns. The contracts act as interfaces between the programmers and the HTML designers and permit tool support for statically checking that both parties fulfill their obligations. This ensures that (1) programmers and HTML designers work more independently focusing on their own expertises, (2) the Web service implementation is better structured and thus easier to develop and maintain, (3) it is guaranteed that only valid HTML is sent to the clients even though it is constructed dynamically, (4) the programmer uses the XML templates consistently, and (5) the form input fields being sent to the client always match the code receiving those values. Additionally, we describe tools that aid in the construction and management of contracts and XML templates.

Web Services Architecture Model to Support Distributed Systems

2019 ◽  
Vol 54 (6) ◽  
Author(s):  
Sawsan Ali Hamid ◽  
Rana Alauldeen Abdalrahman ◽  
Inam Abdullah Lafta ◽  
Israa Al Barazanchi
Keyword(s):  
Web Services ◽  
Web Service ◽  
Distributed System ◽  
Modern Technology ◽  
Service Description ◽  
Architecture Model ◽  
Software Applications ◽  
Evolving Model ◽  
The Web

Recently, web services have presented a new and evolving model for constructing the distributed system. The meteoric growth of the Web over the last few years proves the efficacy of using simple protocols over the Internet as the basis for a large number of web services and applications. Web service is a modern technology of web, which can be defined as software applications with a programmatic interface based on Internet protocol. Web services became common in the applications of the web by the help of Universal, Description, Discovery and Integration; Web Service Description Language and Simple Object Access Protocol. The architecture of web services refers to a collection of conceptual components in which common sets of standard can be defined among interoperating components. Nevertheless, the existing Web service's architecture is not impervious to some challenges, such as security problems, and the quality of services. Against this backdrop, the present study will provide an overview of these issues. Therefore, it aims to propose web services architecture model to support distributed system in terms of application and issues.

A QoS-aware approach for runtime discovery, selection and composition of semantic web services

2016 ◽  
Vol 12 (2) ◽  
pp. 177-200 ◽  
Author(s):  
Sanjay Garg ◽  
Kirit Modi ◽  
Sanjay Chaudhary
Keyword(s):  
Web Services ◽  
Semantic Web ◽  
Web Service ◽  
User Satisfaction ◽  
Service Discovery ◽  
Semantic Web Services ◽  
Functional Requirements ◽  
Semantic Description ◽  
Content Type ◽  
The Web

Purpose Web services play vital role in the development of emerging technologies such as Cloud computing and Internet of Things. Although, there is a close relationship among the discovery, selection and composition tasks of Web services, research community has treated these challenges at individual level rather to focus on them collectively for developing efficient solution, which is the purpose of this work. This paper aims to propose an approach to integrate the service discovery, selection and composition of Semantic Web services on runtime basis. Design/methodology/approach The proposed approach defined as a quality of service (QoS)-aware approach is based on QoS model to perform discovery, selection and composition tasks at runtime to enhance the user satisfaction and quality guarantee by incorporating non-functional parameters such as response time and throughput with the Web services and user request. In this paper, the proposed approach is based on ontology for semantic description of Web services, which provides interoperability and automation in the Web services tasks. Findings This work proposed an integrated framework of Web service discovery, selection and composition which supports end user to search, select and compose the Web services at runtime using semantic description and non-functional requirements. The proposed approach is evaluated by various data sets from the Web Service Challenge 2009 (WSC-2009) to show the efficiency of this work. A use case scenario of Healthcare Information System is implemented using proposed work to demonstrate the usability and requirement the proposed approach. Originality/value The main contribution of this paper is to develop an integrated approach of Semantic Web services discovery, selection and composition by using the non-functional requirements.

scholarly journals A Cluster-Based Browsing Model For QoS-Aware Web Service Selection

2021 ◽  
Author(s):  
Kian Farsandaj
Keyword(s):  
Web Services ◽  
Web Service ◽  
Clustering Algorithm ◽  
Service Selection ◽  
Functional Requirements ◽  
Analysis Techniques ◽  
Symbolic Data ◽  
Web Service Selection ◽  
The Web

In the last decade, selecting suitable web services based on users’ requirements has become one of the major subjects in the web service domain. Any research works have been done - either based on functional requirements, or focusing more on Quality of Service (QoS) - based selection. We believe that searching is not the only way to implement the selection. Selection could also be done by browsing, or by a combination of searching and browsing. In this thesis, we propose a browsing method based on the Scatter/Gather model, which helps users gain a better understanding of the QoS value distribution of the web services and locate their desired services. Because the Scatter/Gather model uses cluster analysis techniques and web service QoS data is best represented as a vector of intervals, or more generically a vector of symbolic data, we apply for symbolic clustering algorithm and implement different variations of the Scatter/Gather model. Through our experiments on both synthetic and real datasets, we identify the most efficient ( based on the processing time) and effective implementations.

Specifying Business-Level Protocols for Web Services Based Collaborative Processes

2013 ◽  
pp. 137-154
Author(s):  
W. L. Yeung
Keyword(s):  
Web Services ◽  
Web Service ◽  
Business Process ◽  
Specification Languages ◽  
Business Process Execution Language ◽  
Negotiation Protocol ◽  
Collaborative Processes ◽  
Process Specification ◽  
Business Process Execution ◽  
The Web

Business collaboration is increasingly conducted over the Internet. Trading parties require business-level protocols for enabling their collaborative processes and a number of standardised languages, and approaches have been proposed for specifying business-level protocols. To illustrate the specification of web services based collaborative processes, three inter-related specification languages, namely, the ebXML Business Process Specification Schema (BPSS), the Web Service Business Process Execution Language (WSBPEL), and the Web Services Conversations Language (WSCL) are discussed in this chapter. A contract negotiation protocol is used as an example to illustrate the concepts involved in the specification. The chapter also discusses different strategies for deploying these specification languages.

Reengineering Legacy Systems Towards Web Environments

2011 ◽  
pp. 138-166
Author(s):  
Ying Zou ◽  
Kostas Kontogiannis
Keyword(s):  
Web Services ◽  
Automatic Generation ◽  
Remote Access ◽  
Legacy Systems ◽  
Business Logic ◽  
Object Oriented Design ◽  
Distributed Object ◽  
Procedural Components ◽  
Xml Web ◽  
The Web

With the widespread use of the Web, distributed object technologies have been widely adopted to construct network-centric architectures, using XML, Web Services, CORBA, and DCOM. Organizations would like to take advantage of the Web in its various forms of Internet, Intranet and Extranets. This requires organizations to port and integrate their legacy assets to distributed Web-enabled environments, so that the functionality of existing legacy systems can be leveraged without having to rebuild these systems. In this chapter, we provide techniques to re-engineer standalone legacy systems into Web-enabled environments. Specifically, we aim for a framework that allows for the identification of reusable business logic entities in large legacy systems in the form of major legacy components, the migration of these procedural components to an object-oriented design, the specification of interfaces of these identified components, the automatic generation of CORBA wrappers to enable remote access, and finally, the seamless interoperation with Web services via HTTP based on the SOAP messaging mechanism.

Web Services as XML Data Sources in Enterprise Information Integration

2011 ◽  
pp. 972-985
Author(s):  
Ákos Hajnal ◽  
Tamás Kifor ◽  
Gergely Lukácsy ◽  
László Z. Varga
Keyword(s):  
Web Services ◽  
Web Service ◽  
Information Integration ◽  
Digital Libraries ◽  
Relational Databases ◽  
Query Language ◽  
Data Sources ◽  
Enterprise Information ◽  
Xml Data ◽  
The Web

More and more systems provide data through web service interfaces and these data have to be integrated with the legacy relational databases of the enterprise. The integration is usually done with enterprise information integration systems which provide a uniform query language to all information sources, therefore the XML data sources of Web services having a procedural access interface have to be matched with relational data sources having a database interface. In this chapter the authors provide a solution to this problem by describing the Web service wrapper component of the SINTAGMA Enterprise Information Integration system. They demonstrate Web services as XML data sources in enterprise information integration by showing how the web service wrapper component integrates XML data of Web services in the application domain of digital libraries.

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