David Lizcano

EzWeb/FAST: reporting on a successful mashup-based solution for developing and deploying composite applications in the upcoming web of services

Service oriented architectures (SOAs) based on Web Services have attracted a great interest and IT investments during the last years, principally in the context of business-to-business integration within corporate intranets. However, they are nowadays evolving to break through enterprise boundaries, in a revolutionary attempt to make the approach pervasive, leading to what we call a user-centric SOA, i.e. a SOA conceived as a Web of Services made up of compositional resources that empowers end-users to ubiquitously exploit these resources by collaboratively remixing them. In this paper we explore the architectural basis, technologies, frameworks and tools considered necessary to face this novel vision of SOA. We also present the rationale behind EzWeb/FAST: an undergoing EU funded project whose first outcomes could serve as a preliminary proof of concept.

A user-centric approach for developing and deploying service front-ends in the future internet of services

Service-Oriented Architectures (SOAs) based on web services have attracted a great deal of interest and Internet Technology (IT) investment over the last few years, principally in the context of business-to-business integration within corporate intranets. However, they are now evolving and breaking through enterprise boundaries in a revolutionary attempt to make the approach pervasive. This is leading to what we call a user-centric SOA. A user-centric SOA is an SOA conceived as an internet of services made up of compositional resources empowering end users to collaboratively remix and ubiquitously exploit these resources. In this paper we explore the architectural basis, technologies, frameworks and tools considered necessary to tackle this novel vision of SOA. We also present the rationale behind EzWeb/FAST, an ongoing EU-funded project whose first outcomes could serve as a preliminary proof of concept.

Leveraging the Upcoming Internet of Services through an Open User-Service Front-End Framework

The Internet of the Future is expected to be composed of a mesh of interoperable Web Services accessed from all over the Web. This approach has not yet caught on since a global user-service interaction is still an open issue. This paper states our position with regard to the next generation front-end technology for the Internet of the Future. This approach will enable the massive deployment of services over the Internet in a user-centric fashion. This paper advocates the full development of front-end technologies to bring services closer to users, empowering them anytime and anywhere. It also outlines all the main gaps and technological challenges that have to be addressed. Finally, a model and an architecture are proposed for building these technologies into NESSIs Open Framework Reference Architecture, NEXOF-RA.

A quality model for web components

Web components improve Internet applications, empowering end-user development with encapsulation and interoperability. Public repositories contain a variety of web components implementing GUI elements, system components for mashup development and wrappers of popular web services. The distribution of this technology through public repositories has fostered a growing interest in quality metrics for web components, highlighting the absence of unified approach. This paper presents a reference model and evaluation framework for measuring the quality of web components. Preliminary results of an experimentation framework provide insights for comparing standard metrics with custom metrics based on curated user-perceived quality and data extracted from public repositories.

Explicitly context-aware publish/subscribe with context-invariant subscriptions

Although context could be exploited to improve the performance, elasticity and adaptation in most distributed systems that adopt the publish/subscribe (P/S) model of communication, only very few works have explored domains with highly dynamic context, whereas most adopted models are context agnostic. In this paper, we present the key design principles underlying a novel context-aware content-based P/S (CA-CBPS) model of communication, where the context is explicitly managed, focusing on the minimization of network overhead in domains with recurrent context changes thanks to contextual scoping. We highlight how we dealt with the main shortcomings of most of the current approaches. Our research is some of the first to study the problem of explicitly introducing context-awareness into the P/S model to capitalize on contextual information. The envisioned CA-CBPS middleware enables the cloud ecosystem of services to communicate very efficiently, in a decoupled, but contextually scoped fashion.