scholarly journals Reconciliation of Contractual Concerns of Web Services

2012 ◽  
pp. 298-321
Author(s):  
Hong-Linh Truong ◽  
G.R. Gangadharan ◽  
Marco Comerio ◽  
Vincenzo D’Andrea ◽  
Flavio De Paoli ◽  
...  
Keyword(s):  
Cloud Computing ◽  
Web Services ◽  
Service Composition ◽  
The Internet ◽  
Research Focus ◽  
Service Contracts ◽  
Monitoring And Enforcement ◽  
Service Oriented ◽  
Computing Environments

There exist many works addressing service contracts fully or partially. They often mention the same notion with different languages and terminologies. This causes several problems in the specification, negotiation, and monitoring of contractual concerns in service-oriented environments, in particular in the Internet-scale and cloud computing environments. With the objective of reconciling contractual concerns, in this chapter, we will analyze the strengths and weaknesses of existing languages and standards for describing service contracts. We will present our research efforts for dealing with multiple contract specifications and semantics mismatching when identifying, specifying, negotiating, and establishing service contracts for service composition in the Internet and cloud computing environments. We will explore the issues of service contracts compatibility and present our solutions. Furthermore, we will analyze crucial points in monitoring and enforcement emerging contractual terms for Internet-based and cloud-based services that so far have not been in the research focus.

Services and Service Composition – An Introduction (Services und Service Komposition – Eine Einführung)

2008 ◽  
Vol 50 (2) ◽  
Author(s):  
Shahram Dustdar ◽  
Mike P. Papazoglou
Keyword(s):  
Web Services ◽  
Service Composition ◽  
Web Applications ◽  
Future Research ◽  
Basic Principles ◽  
Service Oriented Computing ◽  
Research Challenges ◽  
Internet Computing ◽  
The Future ◽  
Service Oriented

SummaryIn this overview paper, we discuss the basic principles underlying service-oriented computing in general, and (Web) services in particular. We discuss the important differences between (Web) services and Web applications and other models in Internet computing. Finally, we discuss where we see the future research challenges in the area of service composition.

IT Security and Governance Compliant Service Oriented Computing in Cloud Computing Environments

2013 ◽  
pp. 143-163
Author(s):  
Hussain Al-Aqrabi ◽  
Lu Liu
Keyword(s):  
Cloud Computing ◽  
Service Providers ◽  
Scale Up ◽  
Security Challenges ◽  
Cloud Computing Service ◽  
High Elasticity ◽  
Literature Reviews ◽  
Service Oriented ◽  
Computing Environments ◽  
Simulation Results

The authors present the key security challenges and solutions on the Cloud with the help of literature reviews and an experimental model created on OPNET that is simulated to produce useful statistics to establish the approach that the Cloud computing service providers should take to provide optimal security and compliance. The literature recommends the concept of unified threat management for ensuring secured services on the Cloud. Through the simulation results, the authors demonstrate that UTM may not be a feasible approach to security implementation as it may become a bottleneck for the application Clouds. The fundamental benefits of Cloud computing (resources on demand and high elasticity) may be diluted if UTMs do not scale up effectively as per the traffic loads on the application Clouds. Moreover, it is not feasible for application Clouds to absorb the performance degradation for security and compliance because UTM will not be a total solution for security and compliance. Applications also share the vulnerabilities just like the systems, which will be out of UTM Cloud’s control.

Generalized Demand-Driven Web Services

2014 ◽  
pp. 102-134 ◽  
Author(s):  
Mihai Horia Zaharia
Keyword(s):  
Web Services ◽  
Service Composition ◽  
Intelligent Agents ◽  
Human Life ◽  
Knowledge Society ◽  
Real Life ◽  
Service Oriented Architectures ◽  
Developed Economies ◽  
Novel Approach ◽  
Service Oriented

Highly developed economies are based on the knowledge society. A variety of software tools are used in almost every aspect of human life. Service-oriented architectures are limited to corporate-related business solutions. This chapter proposes a novel approach aimed to overcome the differences between real life services and software services. Using the design approaches for the current service-oriented architecture, a solution that can be implemented in open source systems has been proposed. As a result, a new approach to creating an agent for service composition is introduced. The agent itself is created by service composition too. The proposed approach might facilitate the research and development of Web services, service-oriented architectures, and intelligent agents.

A Theoretical Foundation of Demand Driven Web Services

2015 ◽  
pp. 392-422
Author(s):  
Zhaohao Sun ◽  
John Yearwood
Keyword(s):  
Web Services ◽  
Social Services ◽  
Service Oriented Architecture ◽  
State Of The Art ◽  
The State ◽  
Cloud Services ◽  
Pivotal Role ◽  
The Internet ◽  
Service Oriented ◽  
The Web

Web services are playing a pivotal role in business, management, governance, and society with the dramatic development of the Internet and the Web. However, many fundamental issues are still ignored to some extent. For example, what is the unified perspective to the state-of-the-art of Web services? What is the foundation of Demand-Driven Web Services (DDWS)? This chapter addresses these fundamental issues by examining the state-of-the-art of Web services and proposing a theoretical and technological foundation for demand-driven Web services with applications. This chapter also presents an extended Service-Oriented Architecture (SOA), eSMACS SOA, and examines main players in this architecture. This chapter then classifies DDWS as government DDWS, organizational DDWS, enterprise DDWS, customer DDWS, and citizen DDWS, and looks at the corresponding Web services. Finally, this chapter examines the theoretical, technical foundations for DDWS with applications. The proposed approaches will facilitate research and development of Web services, mobile services, cloud services, and social services.

Issues on the Compatibility of Web Service Contracts

2013 ◽  
pp. 154-188 ◽  
Author(s):  
Surya Nepal ◽  
John Zic
Keyword(s):  
Web Service ◽  
Service Composition ◽  
Large Scale ◽  
Service Oriented Architecture ◽  
Distributed Applications ◽  
Compatibility Conditions ◽  
Service Contract ◽  
Service Contracts ◽  
Service Oriented ◽  
Application Developers

In the Service Oriented Architecture (SOA) model, a service is characterized by its exchange of asynchronous messages, and a service contract is a desirable composition of a variety of messages. Though this model is simple, implementing large-scale, cross-organizational distributed applications may be difficult to achieve in general, as there is no guarantee that service composition will be possible because of incompatibilities of Web service contracts. We categorize compatibility issues in Web service contracts into two broad categories: (a) between contracts of different services (which we define as a composability problem), and (b) a service contract and its implementation (which we define as a conformance problem). This chapter examines and addresses these problems, first by identifying and specifying contract compatibility conditions, and second, through the use of compatibility checking tools that enable application developers to perform checks at design time.

A Novel Physics Inspired Approach for Web Service Composition

2014 ◽  
Vol 11 (2) ◽  
pp. 67-84 ◽  
Author(s):  
Tanveer Ahmed ◽  
Abhishek Srivastava
Keyword(s):  
Web Services ◽  
Web Service ◽  
Service Composition ◽  
Service Oriented Architecture ◽  
Service Providers ◽  
Web Service Composition ◽  
Heterogeneous Services ◽  
Service Oriented ◽  
Service Consumer ◽  
Selection Of

Service oriented architecture has revolutionized the way a traditional business process is executed. The success of this architecture is Indue to the composition of multiple heterogeneous services at runtime. Web service composition is a mechanism where several web services are combined at runtime to build a complex application for a user. It is one of the most sought after processes in the context of semantic web. But, composition of web services at runtime is a difficult task owing to the availability of multiple service providers offering the same functionality. The process if exasperated by due conflicting preferences of a service consumer. In this paper, the authors address the issue of selecting a service based on Quality of Service (QoS) attributes. They utilize concepts customized from physics to create an environment that facilitates the selection of a best service from the set of similar services. The technique not only facilitates the selection of the service with the best QoS attributes, but distributes the load among expeditiously. Here in this paper, the authors concentrate on minimizing and equitably balancing the waiting time for a user. They conduct in silico experiments on multiple workflows to demonstrate the efficacy of the proposed technique to balance load efficiently among similar service offerings.

Service-Oriented Architecture

2011 ◽  
pp. 998-1002
Author(s):  
Kwan-Ming Wan ◽  
Pouwan Lei ◽  
Chris Chatwin ◽  
Rupert Young
Keyword(s):  
Web Services ◽  
Service Oriented Architecture ◽  
Core Competencies ◽  
Enterprise Application Integration ◽  
The Internet ◽  
Business Systems ◽  
Loosely Coupled ◽  
Enterprise Application ◽  
Tightly Coupled ◽  
Service Oriented

The established global business environment is under intense pressure from Asian countries such as Korea, China, and India. This forces businesses to concentrate on their core competencies and adopt leaner management structures. The coordination of activities both within companies and with suppliers and customers has become a crucial competitive advantage. At the same time, the Internet has transformed the way in which businesses run. As the Internet becomes a cheap and effective communication channel, businesses are quick to adopt the Web for integrating their systems together and linking them with their suppliers and customers. Current enterprise computing using J2EE (Java 2 Platform, Enterprise Edition) has yielded systems in which the coupling between various components in them are too tight to be effective for ubiquitous B2B (business-to-business) and B2C (business-to-consumer) e-business over the Internet. This approach requires too much agreement and shared context between business systems from different organizations. There is a need to move away from tightly coupled, monolithic systems and toward systems of loosely coupled, dynamically bound components. The emerging technology, Web services, provides the tools to accomplish this integration, but this approach presents many new challenges and problems that must be overcome. In this article, we will discuss the current approaches in enterprise application integration (EAI) and the limitations. There is also a need for service-oriented applications, that is, Web services. Finally, the challenges in implementing Web services are outlined.

scholarly journals A Trust-Based Agent Learning Model for Service Composition in Mobile Cloud Computing Environments

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 34207-34226 ◽  
Author(s):  
Wenjuan Li ◽  
Jian Cao ◽  
Keyong Hu ◽  
Jie Xu ◽  
Rajkumar Buyya
Keyword(s):  
Cloud Computing ◽  
Service Composition ◽  
Mobile Cloud Computing ◽  
Learning Model ◽  
Mobile Cloud ◽  
Agent Learning ◽  
Computing Environments
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