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Service composition is a new paradigm for efficient and cost-effective IT service provisioning over the network. To safely and effectively deploy composed services within an organization or among multiple domains, one must be able to specify and enforce a variety of constraints such as those derived from legal regulations, Quality of Service (QoS) requirements and privacy and security policies. In...
This paper describes how to simultaneously support both dynamic policies and separation of concerns when developing an SOA application. We propose the DPSL (dynamic policy specification language) for managing and controlling the QoS according to the dynamic behavior of the workflow in SOA. The operation model is compatible with existing SOA standards, such as the WSDL, WS-Policy, WS-SecurityPolicy,...
This paper presents the quality factors of web services with definition, classification, and sub-factors for business and service level measurement. Web services, main enabler for SOA, usually have characteristics distinguished from general stand-alone software. They are provided in different ownership domain by network. They can also adopt various binding mechanism and be loosely-coupled, platform...
In a Service-Oriented Architecture, a service contains a set of operations with clearly defined input and output parameters. In addition to these operations and traditional QoS, offered services need to publish different levels of intrusion tolerance for two reasons. First, software vulnerabilities can expose services to malicious actors, and make them susceptible to attacks. So, intrusion tolerance...
SOA and cloud computing have brought new opportunities for the long expected agility, reuse and the adaptive capability of IT to the ever changing business requirements and environments. But due to the immature nature of the rapidly evolving technologies, especially in the areas of security, service or information integrity, privacy, quality of service and their possible detrimental consequences,...
In Service Oriented Architecture, Quality of Service (Qos) represents an important issue which is often considered when selecting and composing services. For receiving up-to-date information, non-functional properties can be continuously monitored using current methods. Because of the occurrence of monitoring at every time of service calling, the current methods imposes some overhead on the SOA. The...
IP Multimedia Subsystem (IMS) known for its prominent service delivery is paving way for applications like Video Voice over IP (VVOIP) on handheld devices too. Android, a software platform from Google, pioneering in middleware and applications domain of handheld devices does not offer support for IMS services by design. Motivated by these observations, we present novel scalable architecture to cater...
Service-Oriented Architecture (SOA) paradigm facilitates the design of large systems as a set of loosely coupled services interacting with each other. These services, in turn, can be combined to form a more complex service. But, for services to be useful, they must satisfy non-functional requirements, especially security-related quality of service. Unfortunately, software vulnerabilities expose these...
In the business context, accountability has become a major concern for businesses around the world in aftermath of corporate scandals and fallouts. However, accountability has not been rigorously considered in IT system technologies and solutions. The goal of this study is to provide a clear understanding of accountability concept in service-oriented computing and, more generally, e-society. We first...
Future software systems will be dynamic service oriented systems. Service-Oriented Architecture (SOA) provides an extensible and dynamic architecture to be used, for example, in smart environments. In such an environment, software has to adapt its behaviour dynamically. Thus, there is a need for Verifying and Validating (V & V) the adaptations at run-time. This paper contributes to that by introducing...
In this paper, we introduce an IP multimedia sub-system (IMS) based testbed which provides a platform for the study of real-time services integration and orchestration. This open-source based testbed is built on the principle of service oriented architecture (SOA), with an emphasis for real-time network services. We further developed service-oriented system functionalities such as optical network...
Nowadays, using Service-Oriented Architectures (SOA) is spreading as a flexible architecture for developing dynamic enterprise systems. Due to the increasing need of high quality services in SOA, it is desirable to consider different Quality of Service (QoS) aspects in this architecture as security, availability, reliability, fault tolerance, etc. In this paper we investigate fault tolerance mechanisms...
Web services is a service-oriented architecture of Web-based standard software components, while the agent is intelligent software entity which has its own ability to achieve its designed goals in a heterogeneous environment. In order to improve the qualities of Web services, this paper introduced a QoS module to Web services and proposed agent Web services system (AWSS) for the composition of Web...
The following topics were dealt with: dynamic and declarative business processes; middleware for Web services; advances in quality of service management; mobile technology in enterprise computing systems; security and privacy in enterprise computing; service-oriented business networks and ecosystems; and vocabularies, ontologies and rules for the enterprise.
Nowadays, there is a large diffusion of open and dynamic cooperative architectures that are based on services (SOA). In general, a customer is not only interested in service functionalities, but also in its quality (i.e. performance, cost, reliability, security and so on). In this scenario, models, techniques and tools supporting the effective selection of the service that provides the better quality...
Only commercial cloud solutions have been implemented so far, offering computing resources and services for renting. Some interesting projects, such as Nimbus, OpenNEbula, Reservoir, work on cloud. One of their aims is to provide a cloud infrastructure able to provide and share resources and services for scientific purposes. The encouraging results of volunteer computing projects in this context and...
Service-Oriented Architecture (SOA) is a paradigm for creating and encapsulating business processes in the form of loose-coupling, autonomous and abstracted services. Managing the non-functional requirements of SOA such as security, is an over arching problem due to the wide variety of ways the service consumer can access the services offered by the service provider and the equally varied restrictions...
In the real world a service in a business is usually composed of many component services. These component services join together to form a composite of components. The trustworthiness of component services determines the trustworthiness of this composite. This trustworthiness of composite service has a large impact on the successful delivery of a service. In this paper we study that how we can determine...
Enterprise software is being transformed from an installed product to a hosted service whereby customers pay a subscription fee to access functionality using a Web browser or other clients. The service-oriented architecture (SOA) and Web services will play a key role in driving the vision of software as a service (SaaS). As the number of services and users grow, there is a need for a trusted service...
Service-oriented architecture (SOA) has become an increasingly popular mechanism for achieving business agility and reuse. However, organizations implementing SOA-based solutions are facing new implementation challenges related to validation and verification activities in an SOA environment, especially of runtime system quality attributes such as interoperability, security, reliability, and performance...
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