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.

Supporting Accessible User Interfaces Using Web Services

2016 ◽  
pp. 866-884
Author(s):  
Georgios Bouloukakis ◽  
Ioannis Basdekis ◽  
Constantine Stephanidis
Keyword(s):  
Web Services ◽  
User Interfaces ◽  
Web Applications ◽  
Automatic Generation ◽  
Individual Characteristics ◽  
Web Content ◽  
Interface Elements ◽  
Accessibility Guidelines ◽  
Content Accessibility ◽  
The Web

Web services are an emerging technology that has attracted much attention from both the research and the industry sectors in recent years. The exploitation of Web services as components in Web applications facilitates development and supports application interoperability, regardless of the programming language and platform used. However, existing Web services development standards do not take into account the fact that the provided content and the interactive functionality should be accessible to, and easily operable by, people with disabilities. This chapter presents a platform named myWebAccess, which provides a mechanism for the semi-automated “repair” of Web services' interaction characteristics in order to support the automatic generation of interface elements that conform to the de facto standard of the Web Content Accessibility Guidelines 2.0. myWebAccess enhances interaction quality for specific target user groups, including people with visual and motor disabilities, and supports the use of Web services on diverse platforms (e.g., mobile phones equipped with a browser). The Web developers can build their own design templates and the users of myWebAccess can create a personalized environment containing their favourite services. Thus, they can interact with them through interfaces appropriate to their specific individual characteristics.

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.

Supporting Accessible User Interfaces Using Web Services

2016 ◽  
pp. 1477-1495
Author(s):  
Georgios Bouloukakis ◽  
Ioannis Basdekis ◽  
Constantine Stephanidis
Keyword(s):  
Web Services ◽  
User Interfaces ◽  
Web Applications ◽  
Automatic Generation ◽  
Individual Characteristics ◽  
Web Content ◽  
Interface Elements ◽  
Accessibility Guidelines ◽  
Content Accessibility ◽  
The Web

Web services are an emerging technology that has attracted much attention from both the research and the industry sectors in recent years. The exploitation of Web services as components in Web applications facilitates development and supports application interoperability, regardless of the programming language and platform used. However, existing Web services development standards do not take into account the fact that the provided content and the interactive functionality should be accessible to, and easily operable by, people with disabilities. This chapter presents a platform named myWebAccess, which provides a mechanism for the semi-automated “repair” of Web services' interaction characteristics in order to support the automatic generation of interface elements that conform to the de facto standard of the Web Content Accessibility Guidelines 2.0. myWebAccess enhances interaction quality for specific target user groups, including people with visual and motor disabilities, and supports the use of Web services on diverse platforms (e.g., mobile phones equipped with a browser). The Web developers can build their own design templates and the users of myWebAccess can create a personalized environment containing their favourite services. Thus, they can interact with them through interfaces appropriate to their specific individual characteristics.

Cloud Computing Model and REST APIs Implementation

2011 ◽  
Vol 366 ◽  
pp. 416-420
Author(s):  
Nan Jiang ◽  
Yan Zhong Hu
Keyword(s):  
Cloud Computing ◽  
Web Services ◽  
Web Service ◽  
Software As A Service ◽  
Infrastructure As A Service ◽  
Learning Resource ◽  
Computing Model ◽  
Xml Web ◽  
Asynchronous Javascript And Xml ◽  
The Web

Cloud computing exposes software as a service, platform as a resource, and infrastructure as a service. The way of Web services work naturally makes it the system interface for software communication of a cloud computing architecture. And REST(REpresentational Status Transfer) philosophy is a better way to construct Web services since it is fundamental to the Web and can make full use of the features of the Web. We implement RESTful APIs for learning resource cloud, and the benefits of an Ajax(Asynchronous JavaScript and XML) Web service client to the REST APIs are discussed.

scholarly journals Using XML Web services as a platform for remote access and control of embedded systems

2008 ◽  
Vol 21 (1) ◽  
pp. 23-36
Author(s):  
Danilo Oklobdzija ◽  
Branislav Jevtovic
Keyword(s):  
Embedded Systems ◽  
Web Services ◽  
New Technologies ◽  
Remote Access ◽  
Embedded Devices ◽  
Network Characteristics ◽  
Service Oriented ◽  
Xml Web ◽  
High Level ◽  
And Control

This paper has pointed out the need for new technologies for integrating embedded devices in heterogeneous distributed networks, and outlines the perspectives opened by applying service-oriented paradigm for realizing interaction with embedded devices. As a foundation for interaction with embedded devices, XML and Web services have been used. Strong integration power of XML and Web services make presented framework appropriate for unique approach to all resources of embedded device regardless of applied technology. Developed Web services based middleware, provides application designers with a high level of semantic abstraction, hiding the complexity of the applied technologies. This makes presented framework suitable for use in many domains, independent of embedded devices physical realization or network characteristics. Two ways to achieve such integration have been presented in this paper: device level for modern embedded devices, and using service oriented gateway for "legacy" embedded systems. .

scholarly journals Enabling Mainframe Assets to Services for SOA

2010 ◽  
pp. 282-286
Author(s):  
Latha Sadanandam
Keyword(s):  
Web Services ◽  
Service Oriented Architecture ◽  
Heterogeneous Systems ◽  
Legacy Systems ◽  
Technology Choice ◽  
Business Logic ◽  
Distributed Environment ◽  
Business Agility ◽  
Service Oriented ◽  
Business Functions

Service-oriented architecture (SOA) is a mechanism for achieving interoperability between heterogeneous systems. SOA enables existing legacy systems to expose their functionality as services, without making significant changes to the legacy systems. Migration towards a service-oriented approach (SOA) not only standardizes interaction, but also allows for more flexibility in the existing process. Web services technology is an ideal technology choice for implementing a SOA. Web services can be implemented in any programming language. The functionality of Web services range from simple request-reply to full business process. These services can be newly developed applications or just wrapper program for existing business functions to be network-enabled. The strategy is to form a framework to integrate z/OS assets in distributed environment using SOA approach, to enable optimal business agility and flexibility. Mainframe applications run the business and contain critical business logic that is unique, difficult, and costly to replicate. Enabling existing applications allows reusing critical business assets and leveraging the assets as a service to be invoked in heterogeneous environment.

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.

A Method of Automatic Generation of Documents from WSDL to OWL-S

2014 ◽  
Vol 668-669 ◽  
pp. 1202-1207 ◽  
Author(s):  
Liang Zhao ◽  
Yu Qing Lan ◽  
Guang Hao Zhang
Keyword(s):  
Web Services ◽  
Web Service ◽  
Service Composition ◽  
Automatic Generation ◽  
Xml Schema ◽  
Semantic Web Service ◽  
Mapping Rule ◽  
Xml Document ◽  
The Relationship ◽  
The Web

A web service is a software function provided at a network address over the web or the cloud. Conventional web service is described by WSDL. As for the conventional web services, it has problems of discovering and selecting the most suitable web service. Semantic web service can solve these problems, and it is described by OWL-S. In this paper, we propose a method of automatic generation of documents from WSDL to OWL-S. To accomplish this, we first translate XML document to OWL document through the relationship between XML Schema and the ontology. We use a mapping rule from XML Schema to Schema tree and Element tree. As for the WSDL document is written by XML. And OWL-S document is written by OWL. We translate WSDL document to OWL-S document based on mapping between XML document and OWL document. At present, most of web service is described by WSDL. According to this method, we can not only translate from WSDL document to OWL-S document easily, but also make the generation more efficient. Thus, we provide support for extensive of web services and service composition and discovery. Through the use of an example, the paper verifies the method is feasible and effective.

Supporting Accessible User Interfaces Using Web Services

2014 ◽  
pp. 137-155
Author(s):  
Georgios Bouloukakis ◽  
Ioannis Basdekis ◽  
Constantine Stephanidis
Keyword(s):  
Web Services ◽  
User Interfaces ◽  
Web Applications ◽  
Automatic Generation ◽  
Individual Characteristics ◽  
Web Content ◽  
Interface Elements ◽  
Accessibility Guidelines ◽  
Content Accessibility ◽  
The Web

Web services are an emerging technology that has attracted much attention from both the research and the industry sectors in recent years. The exploitation of Web services as components in Web applications facilitates development and supports application interoperability, regardless of the programming language and platform used. However, existing Web services development standards do not take into account the fact that the provided content and the interactive functionality should be accessible to, and easily operable by, people with disabilities. This chapter presents a platform named myWebAccess, which provides a mechanism for the semi-automated “repair” of Web services' interaction characteristics in order to support the automatic generation of interface elements that conform to the de facto standard of the Web Content Accessibility Guidelines 2.0. myWebAccess enhances interaction quality for specific target user groups, including people with visual and motor disabilities, and supports the use of Web services on diverse platforms (e.g., mobile phones equipped with a browser). The Web developers can build their own design templates and the users of myWebAccess can create a personalized environment containing their favourite services. Thus, they can interact with them through interfaces appropriate to their specific individual characteristics.

Business and Technological Aspects of the Web Services

2015 ◽  
Vol 16 (5) ◽  
pp. 153-163
Author(s):  
Taehwan Kim ◽  
Wonjin Jung
Keyword(s):  
Web Services ◽  
The Web
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