Service Oriented Architectures (SOAs) are component-based architectures, characterized by reusability, modularization and composition, usually offered by HTTP (web services) and often equipped with a Quality of Services (QoS) measure. In order to guarantee the fairness property to each client requesting a service, we propose a fair version of the (Soft) Concurrent Constraint language to deal wi...

Often many available web services provide similar functionality, but have different Quality of Service (QoS). In this case, a choice needs to be made to determine which services are selected to participate in a given service composition. This paper proposes a technique for QoS-aware service composition with the purpose to pro-actively minimize the rate of violations of a service level agreement...

Due to the large variety in computing resources, Cloud markets often suffer from a low probability of finding matches between consumers’ bids and providers’ asks, resulting in low market liquidity. The approach of service level agreement (SLA) templates (i.e., templates for electronic contracts) is a mean to reduce this variety as it channels the demand and supply. However, until now, the SLA t...

Cloud computing is one of the fastest growing technology. Pay-as-you-go model attracts the customer to utilize the large amount of cloud services in very low cost. Scalability and virtualization plays a vital role to achieve this goal. Scalability is the ability to find the number of users and to provide the service accordingly. Scaling can be divided into two, namely Auto-scaling or dynamic sc...

Premium IP networks provide users with a portfolio of services, thanks to their intrinsic capability to perform a service creation process while relying on a QoSenabled infrastructure. The most natural interface between users and Premium IP networks is represented by the Service Level Agreement (SLA). In order to allow an effective exploitation of such networks, it is of primary importance the ...

Cluster computing is excellent for parallel computation. It has become increasingly popular. In cluster computing, a service level agreement (SLA) is a set of quality of services (QoS) and a fee agreed between a customer and an application service provider. It plays an important role in an e-business application. An application service provider uses a set of cluster computing resources to suppo...

In this paper we present SALMon, a tool assessing the satisfaction of service level agreement (SLA) clauses by service-oriented systems. SALMon itself is organized as a service-oriented system that offers two kind of services: 1) the Monitor service that measures the values in execution time of dynamic quality attributes (like response time or availability), and 2) the Analyzer service that det...

The increasing adoption of service oriented architectures across different administrative domains, forces service providers to use effective mechanisms and strategies of resource management in order for them to be able to guarantee the quality levels their customers demands during service provisioning. Service level agreements (SLA) are the most common mechanism used to establish agreements on ...

Today’s communication networks are migrating from resource based networks to service based network. These services could include, for example, financial, trading and other corporate services. Failing of such services would have significant impact, therefore it is important to ensure the resilience of a service as attributed in Service Level Agreements. In this paper we propose design of a test ...

Since the cloud paradigm becomes increasingly popular for dynamic resources allocation, the flexibility of a cloud is still limited regarding network services and their autonomous federation between different providers. The following architectural approach introduces a generic layered model to orchestrate and federate heterogeneous networks. In particular, an architecture is presented that enab...