scholarly journals Resolving Interoperability Issues of Date with Null Value and Collection of Complex Data Types by Using JADE-WSIG Framework

Webology ◽  
2021 ◽  
Vol 18 (1) ◽  
pp. 263-284
Author(s):  
Jaspreet Chawla ◽  
Anil Kr. Ahlawat
Keyword(s):  
Data Structure ◽  
Web Services ◽  
Web Service ◽  
Web Applications ◽  
Data Type ◽  
Complex Data ◽  
Data Types ◽  
Time Data ◽  
Loosely Coupled ◽  
Null Value

In today’s world, the internet and distributed computing make things so convenient that web services can be easily built and fetch from any platform. Web services are loosely coupled, interoperable, and heterogeneous hence they help to connect web applications of different languages. Interoperability is the major factor while transferring web services from one platform to another platform.WS-I basic profile 1.0/1.1 organization provides guidelines to achieve interoperability of web services at a basic level but still, issues arise at a complex level. In this paper, we have discussed and shown the result of two interoperability issues i.e. Date with Null value and Collection of Complex data types of web services using JAVA and.NET environment. In the first issue.NET treat NULL as a value type and JAVA treats NULL as reference type in date-time data type. So, whenever a JAVA client fetches a web service built in.NET it will show a parsable error. In the second issue, a web service data structure contains elements of any type. Whenever, a web service built with the ‘ArrayOfAnyType’ data structure, it can be easily mapped to a.NET client but not to JAVA client. Hence, a data type mismatch issue arises here. To resolve these inter-platform issues, we have used JADE-WSIG as middleware between web services and agent-technology.

Web Services

2007 ◽  
pp. 244-267
Author(s):  
Bernd Aman ◽  
Salima Benbernou ◽  
Benjamin Nguyen
Keyword(s):  
Web Services ◽  
Web Service ◽  
Service Composition ◽  
Web Applications ◽  
Loosely Coupled ◽  
Composition Problem ◽  
Service Oriented ◽  
Service Paradigm ◽  
Current Standards ◽  
The Web

Unlike traditional applications, which depend upon a tight interconnection of all program elements, Web service applications are composed of loosely coupled, autonomous and independent services published on the Web. In this chapter, we first introduces the concept of service oriented computing (SOC) on the Web and the current standards enabling the definition and publication of Web services. This technology’s next evolution is to facilitate the creation and maintenance of Web applications. This can be achieved by exploiting the self-descriptive nature of Web services combined with more powerful models and languages for composing Web services. A second objective of this chapter is to illustrate the complexity of the Web service composition problem and to provide a representative overview of the existing approaches. The chapter concludes with a short presentation of two research projects exploiting and extending the Web service paradigm.

Service Composition Verification and Validation

2013 ◽  
pp. 200-219
Author(s):  
Manuel Palomo-Duarte
Keyword(s):  
Web Services ◽  
Software Development ◽  
Web Service ◽  
Service Composition ◽  
Web Service Composition ◽  
Verification And Validation ◽  
Loosely Coupled ◽  
Program Testing ◽  
Traditional Program ◽  
Programming Systems

Web services are changing software development thanks to their loosely coupled nature and simple adoption. They can be easily composed to create new more powerful services, allowing for large programming systems. Verification and validation techniques try to find defects in a program to minimize losses that its malfunction could cause. Although many different approaches have been developed for “traditional” program testing, none of them have proven definitive. The problem is even more challenging for new paradigms like web services and web service compositions, because of their dynamic nature and uncommon web service-specific instructions. This chapter surveys the different approaches to web service and web service composition verification and validation, paying special attention to automation. When no tools are available for a given technique, academic efforts are discussed, and challenges are presented.

Distributed Geospatial Processing Services

2011 ◽  
pp. 1186-1193 ◽  
Author(s):  
Carlos Granell ◽  
Laura Díaz ◽  
Michael Gould
Keyword(s):  
Web Services ◽  
Web Service ◽  
Spatial Data ◽  
Geospatial Data ◽  
Service Description ◽  
Service Oriented Architectures ◽  
Data Infrastructure ◽  
Loosely Coupled ◽  
Tightly Coupled ◽  
Geospatial Services

The development of geographic information systems (GISs) has been highly influenced by the overall progress of information technology (IT). These systems evolved from monolithic systems to become personal desktop GISs, with all or most data held locally, and then evolved to the Internet GIS paradigm in the form of Web services (Peng & Tsou, 2001). The highly distributed Web services model is such that geospatial data are loosely coupled with the underlying systems used to create and handle them, and geospatial processing functionalities are made available as remote, interoperable, discoverable geospatial services. In recent years the software industry has moved from tightly coupled application architectures such as CORBA (Common Object Request Broker Architecture?Vinoski, 1997) toward service-oriented architectures (SOAs) based on a network of interoperable, well-described services accessible via Web protocols. This has led to de facto standards for delivery of services such as Web Service Description Language (WSDL) to describe the functionality of a service, Simple Object Access Protocol (SOAP) to encapsulate Web service messages, and Universal Description, Discovery, and Integration (UDDI) to register and provide access to service offerings. Adoption of this Web services technology as an option to monolithic GISs is an emerging trend to provide distributed geospatial access, visualization, and processing. The GIS approach to SOA-based applications is perhaps best represented by the spatial data infrastructure (SDI) paradigm, in which standardized interfaces are the key to allowing geographic services to communicate with each other in an interoperable manner. This article focuses on standard interfaces and also on current implementations of geospatial data processing over the Web, commonly used in SDI environments. We also mention several challenges yet to be met, such as those concerned with semantics, discovery, and chaining of geospatial processing services and also with the extension of geospatial processing capabilities to the SOA world.

Semantic Web Services

2009 ◽  
pp. 1293-1298
Author(s):  
Juan Manuel Adán-Coello
Keyword(s):  
Web Services ◽  
Web Service ◽  
Business Processes ◽  
Building Blocks ◽  
Distributed Applications ◽  
Point Of View ◽  
Loosely Coupled ◽  
Service Invocation ◽  
Computing Paradigm ◽  
Computing Platforms

Service-oriented computing (SOC) is a new computing paradigm that uses services as building blocks to accelerate the development of distributed applications in heterogeneous computer environments. SOC promises a world of cooperating services where application components are combined with little effort into a network of loosely coupled services for creating flexible and dynamic business processes that can cover many organizations and computing platforms (Chesbrough & Spohrer, 2006; Papazoglou & Georgakopoulos, 2003). From a technical point of view, the efforts to offer services have focused on the development of standards and the creation of the infrastructure necessary to describe, discover, and access services using the Web. This type of service is usually called a Web service. The availability of an abundant number of Web services defines a platform for distributed computing in which information and services are supplied on demand, and new services can be created (composed) using available services. Nevertheless, the composition of Web services involves three fundamental problems (Sycara, Paolucci, Ankolekar, & Srinivasan, 2003): 1. To elaborate a plan that describes how Web services interact, how the functionally they offer can be integrated to provide a solution to the considered problem. 2. To discover Web services that accomplish the tasks required by the plan. 3. To manage the interaction of the chosen services. Problems 2 and 3 are of responsibility of the infrastructure that supports the composition of services, while the first problem is of responsibility of the (software) agents that use the infrastructure. The discovery and interaction of Web services poses two main challenges to the infrastructure: 1. How to represent Web services capabilities and how to recognize the similarities between service capabilities and the required functionalities. 2. How to specify the information a Web service requires and provides, the interaction protocol, and the low-level mechanisms required to service invocation.

Interactive and Iterative Service-Composition-Based Approach to Flexible Information System Development

2011 ◽  
Vol 8 (4) ◽  
pp. 81-107 ◽  
Author(s):  
Qianhui Liang ◽  
Anandhi Bharadwaj ◽  
Bu Sung Lee
Keyword(s):  
Information System ◽  
Web Services ◽  
Web Service ◽  
Service Composition ◽  
Service Oriented Architecture ◽  
System Development ◽  
Hybrid Technique ◽  
Information System Development ◽  
Service Usage ◽  
Loosely Coupled

An emerging class of technologies defined as Service-Oriented Architecture (SOA) has been heralded as the answer for inflexible IT architecture and promises to reduce operational barriers of current IT infrastructures. In SOA, loosely coupled Web services are integrated to provide dynamic digital capabilities within and across enterprise boundaries. Little research exists on development processes of information systems using Web services and against certain development metrics. One way to perform such research is to propose a development approach, identify the metrics, and embed the metrics into the technique of service composition to allow system development with desired characteristics. This paper reports an approach to information system development based on Web services composition and the metrics designed for such approaches. This approach is based on semi-automatic, interactive, and iterative Web service composition -- a hybrid technique based on developing and searching an AND/OR graph for composite services discovery while taking into consideration human judgment for solution selection and validation by interactions in an iterative way. The composition process leverages historical Web service usage data and provides helpful suggestions to the users regarding available component services. The authors propose that the metrics can investigate the characteristics of such development approaches.

A Web Based Data Processing Concept for Building Diagnostics and Performance Evaluation

2019 ◽  
Vol 887 ◽  
pp. 641-649
Author(s):  
Matthias Schuss ◽  
Farhang Tahmasebi ◽  
Ardeshir Mahdavi
Keyword(s):  
Performance Evaluation ◽  
Web Services ◽  
Data Processing ◽  
Web Service ◽  
Data Access ◽  
Data Logging ◽  
Time Data ◽  
Web Based ◽  
Related Service ◽  
The Impact

Buildings are responsible for a major amount of the annual energy consumption. A detailed recording and evaluation of building data could provide a deeper understanding of building operation schemes and the corresponding performance. This could help building owners and operators to evaluate and better understand the actual situation. Based on this (real-time) data an optimized operation scheme can be designed and implemented for future time steps. Additionally, a more detailed understanding of the impact of previous building systems interactions will be possible. The building automation industry and the related service provider sector are actually providing proprietary solutions for data logging, visualization and energy optimization. Such solutions are regularly integrated into their own specific software of the used proprietary building management solutions. As an alternative, we suggest an Internet of Things (IoT) and web services inspired concept for the implementation of a generic web service for building diagnostics. Our suggestion encompasses a holistic performance evaluation that considers both the energy consumptions and delivered building service. In this contribution, a general design of a web service based solution is presented and the future possibilities for data access from various sources are discussed. Furthermore, details of actually developed and demonstratively implemented software components for data preprocessing are presented. Data processing examples for different types of data are included and highlight the potential of such web-based approaches. Moreover, possibilities for improved building control by the use of web services for operation schedule generation or model predictive control are illustrated and critically debated.

scholarly journals Principles of securing RESTful API web services developed with python frameworks

2021 ◽  
Vol 2094 (3) ◽  
pp. 032016
Author(s):  
D V Kornienko ◽  
S V Mishina ◽  
S V Shcherbatykh ◽  
M O Melnikov
Keyword(s):  
Web Services ◽  
Web Service ◽  
Web Application ◽  
Web Applications ◽  
Architectural Styles ◽  
Application Architecture ◽  
Key Points ◽  
Restful Web Service ◽  
Rest Api ◽  
Python Programming

Abstract This article discusses the key points of developing a secure RESTful web service API for keeping a student achievement journal. The relevance of using web services has been analyzed. The classification of web applications is given. The features of the Single Page Application architecture were considered. Comparative characteristics of architectural styles of application programming interfaces are given. Requirements to be met by RESTful API services are considered. The basic principles of API security were analyzed. A list of the main vulnerabilities that may appear during the development of the REST API is given. An overview of popular authentication schemes (methods) is given. Comparative characteristics of web frameworks of the Python programming language are given. The main tools used in the development of web API applications are listed. The process of creating a secure prototype of a RESTful web service API in Python using the Flask microframework and a tool for describing the Swagger specifications is presented. The process of configuring the application was examined in detail. The main recommendations for securing a web application, database and web server settings are listed. The key points of ensuring the protection of the developed web application are considered. The results obtained were analyzed.

Similarity Measures for Substituting Web Services

2010 ◽  
Vol 7 (3) ◽  
pp. 1-29 ◽  
Author(s):  
Maricela Bravo ◽  
Matias Alvarado
Keyword(s):  
Web Services ◽  
Web Service ◽  
Similarity Measures ◽  
Experimental Tests ◽  
Service Operations ◽  
Similarity Measurement ◽  
Data Types ◽  
Composite Web Service ◽  
Service Operation ◽  
Private And Public

Web service substitution is one of the most advanced tasks that a composite Web service developer must achieve. Substitution occurs when, in a composite scenario, a service operation is replaced to improve the composition performance or fix a disruption caused by a failing service. To move the automation of substitution forward, a set of measures, considering structure and functionality of Web services, are provided. Most of current proposals for the discovery and matchmaking of Web services are based on the semantic perspective, which lacks the precise information that is needed toward Web service substitution. This paper describes a set of similarity measures to support this substitution. Similarity measurement accounts the differences or similarities by the syntax comparison of names and data types, followed by the comparison of input and output parameters values of Web service operations. Calculation of these measures was implemented using a filtering process. To evaluate this approach, a software architecture was implemented, and experimental tests were carried on both private and public available Web services. Additionally, as is discussed, the application of these measures can be extended to other Web services tasks, such as classification, clustering and composition.

A Petri Net-Based Specification Model Towards Verifiable Service Computing

2011 ◽  
pp. 285-321 ◽  
Author(s):  
Jia Zhang ◽  
Carl K. Chang ◽  
Seong W. Kim
Keyword(s):  
Web Services ◽  
Web Service ◽  
Petri Net ◽  
Web Applications ◽  
Service Computing ◽  
Business Transactions ◽  
Architectural Model ◽  
New Business ◽  
Service Components ◽  
Engineering Enterprise

The emerging paradigm of Web services opens a new way of engineering enterprise Web applications via rapidly developing and deploying Web applications by composing independently published Web-service components to conduct new business transactions. However, how to formally validate and reason about the properties of an enterprise system composed of Web-service components remains a challenge. This chapter introduces an advanced topic of enterprise service computing: the formal verification and validation of enterprise Web services. The authors introduce a Web-services net (WS-Net), which is an executable architectural description language incorporating the semantics of colored petri nets with the style and understandability of the object-oriented concept and Web-services concept. As an architectural model that formalizes the architectural topology and behaviors of each Web-service component as well as the entire system, WS-Net facilitates the simulation, verification, and automated composition of Web services.

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