Ensuring Customised Transactional Reliability of Composite Services

2013 ◽  
pp. 203-232 ◽  
Author(s):  
Sami Bhiri ◽  
Walid Gaaloul ◽  
Claude Godart ◽  
Olivier Perrin ◽  
Maciej Zaremba ◽  
...  
Keyword(s):  
Web Services ◽  
Web Service ◽  
Control Structure ◽  
Point Of View ◽  
Workflow Patterns ◽  
Composite Services ◽  
Transactional Models ◽  
Transactional Approach

Web services are defined independently of any execution context. Due to their inherent autonomy and heterogeneity, it is difficult to examine the behaviour of composite services, especially in case of failures. This paper is interested in ensuring composite services reliability. Reliable composition is defined as a composition where all instance executions are correct from a transactional and business point of view. In this paper, the authors propose a transactional approach for ensuring reliable Web service compositions. The approach integrates the expressivity power of workflow models and the reliability of Advanced Transactional Models (ATM). This method offers flexibility for designers to specify their requirements in terms of control structure, using workflow patterns, and execution correctness. Contrary to ATM, the authors start from the designers’ specifications to define the appropriate transactional mechanisms that ensure correct executions according to their requirements.

Ensuring Customised Transactional Reliability of Composite Services

2011 ◽  
Vol 22 (2) ◽  
pp. 64-92 ◽  
Author(s):  
Sami Bhiri ◽  
Walid Gaaloul ◽  
Claude Godart ◽  
Olivier Perrin ◽  
Maciej Zaremba ◽  
...  
Keyword(s):  
Web Services ◽  
Web Service ◽  
Control Structure ◽  
Point Of View ◽  
Workflow Patterns ◽  
Composite Services ◽  
Transactional Models ◽  
Transactional Approach

Web services are defined independently of any execution context. Due to their inherent autonomy and heterogeneity, it is difficult to examine the behaviour of composite services, especially in case of failures. This paper is interested in ensuring composite services reliability. Reliable composition is defined as a composition where all instance executions are correct from a transactional and business point of view. In this paper, the authors propose a transactional approach for ensuring reliable Web service compositions. The approach integrates the expressivity power of workflow models and the reliability of Advanced Transactional Models (ATM). This method offers flexibility for designers to specify their requirements in terms of control structure, using workflow patterns, and execution correctness. Contrary to ATM, the authors start from the designers’ specifications to define the appropriate transactional mechanisms that ensure correct executions according to their requirements.

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.

GENERATING TEST CASES OF COMPOSITE SERVICES BASED ON OWL-S AND EH-CPN

2010 ◽  
Vol 20 (07) ◽  
pp. 921-941 ◽  
Author(s):  
BIXIN LI ◽  
SHUNHUI JI ◽  
DONG QIU ◽  
JU CAI
Keyword(s):  
Web Services ◽  
Web Service ◽  
Complex Function ◽  
Control Flow ◽  
Test Sequence ◽  
Test Cases ◽  
Automatic Integration ◽  
Flow Information ◽  
Composite Services ◽  
Service Reuse

In web service times, the techniques for composing services are based on service reuse and automatic integration. A new web service will be generated by composing some existing web services. These web services cooperate with each other to provide a new more complex function. It is necessary and very important to test the interaction behavior between any two web services during composition. In this paper, a kind of enhanced hierarchical color petri-net (or EH-CPN) is introduced to generate test cases for testing the interaction, where EH-CPN is transformed from OWL-S document, and both control flow and data flow information in EH-CPN are analyzed and used to generate an executable test sequence, and further test cases are created by combining the test sequence and test data in an XML file.

Enhancing Security Modeling for Web Services Using Delegation and Pass-On

2010 ◽  
Vol 7 (1) ◽  
pp. 1-21 ◽  
Author(s):  
Wei She ◽  
I-Ling Yen ◽  
Bhavani Thuraisingham
Keyword(s):  
Web Services ◽  
Web Service ◽  
Information Flow ◽  
Security Model ◽  
Security Issues ◽  
Web Service Security ◽  
Security Models ◽  
Composite Services ◽  
Service Environments ◽  
Security Standards

In recent years, security issues in web service environments have been widely studied and various security standards and models have been proposed. However, most of these standards and models focus on individual web services and do not consider the security issues in composite services. In this article, the authors propose an enhanced security model to control the information flow in service chains. It extends the basic web service security models by introducing the concepts of delegation and pass-on. Based on these concepts, new certificates, certificate chains, delegation and pass-on policies, and how they are used to control the information flow are discussed. The authors also introduce a case study from a healthcare information system to illustrate the protocols.

Web Service Orchestration and Choreography

2011 ◽  
pp. 250-273 ◽  
Author(s):  
Florian Daniel
Keyword(s):  
Web Services ◽  
Web Service ◽  
Point Of View ◽  
Service Development ◽  
Service Orchestration ◽  
Development Framework ◽  
Web Service Orchestration ◽  
Problems And Solutions ◽  
Enterprise Collaboration ◽  
The Web

The Web service domain is a fast growing and fast changing environment. From a business perspective, the trend over the last few years in the Web services area firmly points toward seamless business logic integration and inter-enterprise collaboration. However, in order to accomplish such goals, both technological and conceptual advances are required. Some already have proven their viability, others still have to be made. Among them, Web service orchestration and choreography are of crucial importance, but still lack a widely agreed on development framework comprising both technological and conceptual aspects. In this paper we try to provide a critical snapshot of current standards for Web service development and particularly we focus on Web service orchestration and choreography. We discuss problems and solutions from a conceptual point of view, exemplify the illustrated ideas by means of real-world technologies and standards and highlight the mutual dependencies that exist among orchestration and choreography of Web services.

Towards a High-Availability-Driven Service Composition Framework

2013 ◽  
pp. 221-243 ◽  
Author(s):  
Jonathan Lee ◽  
Shang-Pin Ma ◽  
Shin-Jie Lee ◽  
Chia-Ling Wu ◽  
Chiung-Hon Leon Lee
Keyword(s):  
Web Services ◽  
Web Service ◽  
Service Composition ◽  
Service Discovery ◽  
Service Management ◽  
High Availability ◽  
Main Trend ◽  
Service Oriented ◽  
Composite Services ◽  
Delivery Approach

Service-Oriented Computing (SOC), a main trend in software engineering, promotes the construction of applications based on the notion of services. SOC has recently attracted a great deal of attention from researchers, and has been comprehensively adopted by industry. However, service composition enabling the aggregation of existing services into composite services still imposes a great challenge to service-oriented technology. Web service composition requires component Web services to be available in request, to behave correctly in operation, and to be replaceable flexibly in failure. Although availability of Web services plays a crucial role in building robust SOC-based applications, it has been largely neglected, especially for service composition. In this chapter, we propose a service composition framework that integrates a set of composition-based service discovery mechanisms, a user-oriented service delivery approach, as well as a service management mechanism for composite services.

Towards a High-Availability-Driven Service Composition Framework

2014 ◽  
pp. 1498-1520
Author(s):  
Jonathan Lee ◽  
Shang-Pin Ma ◽  
Shin-Jie Lee ◽  
Chia-Ling Wu ◽  
Chiung-Hon Leon Lee
Keyword(s):  
Web Services ◽  
Web Service ◽  
Service Composition ◽  
Service Discovery ◽  
Service Management ◽  
High Availability ◽  
Main Trend ◽  
Service Oriented ◽  
Composite Services ◽  
Delivery Approach

Service-Oriented Computing (SOC), a main trend in software engineering, promotes the construction of applications based on the notion of services. SOC has recently attracted a great deal of attention from researchers, and has been comprehensively adopted by industry. However, service composition enabling the aggregation of existing services into composite services still imposes a great challenge to service-oriented technology. Web service composition requires component Web services to be available in request, to behave correctly in operation, and to be replaceable flexibly in failure. Although availability of Web services plays a crucial role in building robust SOC-based applications, it has been largely neglected, especially for service composition. In this chapter, we propose a service composition framework that integrates a set of composition-based service discovery mechanisms, a user-oriented service delivery approach, as well as a service management mechanism for composite services.

Enhancing Security Modeling for Web Services Using Delegation and Pass-On

2012 ◽  
pp. 286-307
Author(s):  
Wei She ◽  
I-Ling Yen ◽  
Bhavani Thuraisingham
Keyword(s):  
Web Services ◽  
Web Service ◽  
Information Flow ◽  
Security Model ◽  
Security Issues ◽  
Web Service Security ◽  
Security Models ◽  
Composite Services ◽  
Service Environments ◽  
Security Standards

In recent years, security issues in web service environments have been widely studied and various security standards and models have been proposed. However, most of these standards and models focus on individual web services and do not consider the security issues in composite services. In this article, the authors propose an enhanced security model to control the information flow in service chains. It extends the basic web service security models by introducing the concepts of delegation and pass-on. Based on these concepts, new certificates, certificate chains, delegation and pass-on policies, and how they are used to control the information flow are discussed. The authors also introduce a case study from a healthcare information system to illustrate the protocols.

An Optimal and Complete Algorithm for Automatic Web Service Composition

2012 ◽  
Vol 9 (2) ◽  
pp. 1-20 ◽  
Author(s):  
Pablo Rodriguez-Mier ◽  
Manuel Mucientes ◽  
Juan C. Vidal ◽  
Manuel Lama
Keyword(s):  
Web Services ◽  
Web Service ◽  
Service Composition ◽  
Web Service Composition ◽  
Optimization Techniques ◽  
Point Of View ◽  
Coupled Systems ◽  
Time Restrictions ◽  
Composition Problem ◽  
Message Structure

The ability of web services to build and integrate loosely-coupled systems has attracted a great deal of attention from researchers in the field of the automatic web service composition. The combination of different web services to build complex systems can be carried out using different control structures to coordinate the execution flow and, therefore, finding the optimal combination of web services represents a non-trivial search effort. Furthermore, the time restrictions together with the growing number of available services complicate further the composition problem. In this paper the authors present an optimal and complete algorithm which finds all valid compositions from the point of view of the semantic input-output message structure matching. Given a request, a service dependency graph which represents a suboptimal solution is dynamically generated. Then, the solution is improved using a backward heuristic search based on the A* algorithm which finds all the possible solutions with different number of services and runpath. Moreover, in order to improve the scalability of our approach, a set of dynamic optimization techniques have been included. The proposal has been validated using eight different repositories from the Web Service Challenge 2008, obtaining all optimal solutions with minimal overhead.

scholarly journals Improving Collaborations in the Neuroscientist Community

2011 ◽  
Vol 3 (1) ◽  
pp. 33-49 ◽  
Author(s):  
Isabelle Mirbel ◽  
Pierre Crescenzo
Keyword(s):  
Image Analysis ◽  
Web Services ◽  
Semantic Web ◽  
Web Service ◽  
Process Modeling ◽  
Point Of View ◽  
Semantic Web Service ◽  
Semantic Web Technologies ◽  
Web Technologies ◽  
Expected Result

In this paper, the authors present an approach called SATIS (Semantically AnnotaTed Intentions for Services), relying on intentional process modeling and semantic web technologies and models, assists collaboration among the members of the neurosciences community. The main expected result of this work is to derive and share semantic web service specifications from a neuroscientist’s point of view to operationalise image analysis pipelines with web services.

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