Existing web service composition and adaptation mechanisms are limited only to the scope of web service choreography in terms of web service selection/invocation vis-à-vis prespecified Service Level Agreement constraints. Such a scope hardly leaves ground for a participating service in a choreographed flow to re-adjust itself in terms of changed non functional expectations and most often these ...

Service-oriented architectures are a popular architectural paradigm for building software applications from a number of loosely coupled, distributed services. Through a set of procedural rules, workflow technologies define how groups of services coordinate with one another to achieve a shared task. A problem with workflow specifications is that often the patterns of interaction between the dist...

The representation of process and service choreographies has been recognized as an important requirement in service-oriented methodologies. The guarantee of alignment between process and service choreographies and the verification of the behavior of choreographies represent an important improvement for such methodologies, since they enable the automatic generation of choreography service specif...

Web services are now widely utilized which demands to perform the discovery and composition process to meet the user request. By considering services as the base, an architectural model has been provided by Service Oriented Architecture (SOA). These web services are also known as traditional web services or SOAP web services. These web services increases overhead of XML processing at descriptio...

In the last years both industry and academia have shown a great interest in ensuring consistent cooperation for business-critical services, with contractually agreed levels of Quality of Service. Service Level Agreement specifications as well as techniques for their evaluation are nowadays irremissible assets. This paper presents Puppet (Pick UP Performance Evaluation Test-bed), an approach and...

The Service-Oriented Architecture (soa) has become one of the most popular approaches to building large-scale network applications. The web service technologies are de facto the default implementation for soa. Simple Object Access Protocol (soap) is the key and fundamental technology of web services. Service composition is a way to deliver complex services based on existing partner services. Se...

This position paper proposes the use of dynamic aspects and the visitor design pattern to obtain a highly configurable and extensible BPEL engine. Using these two techniques, the core of this infrastructural software can be customised to meet new requirements and add features such as debugging, execution monitoring, or changing to another Web Service selection policy. Additionally, it can easil...

We present the choreography enactment pricing game, a cooperative game-theoretic model for the study of scheduling of jobs using competitor service providers. A choreography (a peer-to-peer service composition model) needs a set of services to fulfill its jobs requirements. Users must choose, for each requirement, which service providers will be used to enact the choreography at lowest cost. Du...

in this paper the design and implementation of fault tolerable architecture for scientific workflow engines is presented. the engines are assumed to be implemented as composite web services. current architectures for workflow engines do not make any considerations for substituting faulty web services with correct ones at run time. the difficulty is to rollback the execution state of the workflo...

Choreography, orchestration and dynamic invocation allow new web services to be composed from existing ones. However, these compositions create service interdependencies that can be misused for financial fraud and other illegal purposes. When a misuse is reported, investigators have to navigate through collections of logs to recreate the invocation scenario in order to evaluate the misuse claim...