Dynamic Composition Model Research Articles

ReactiveFnJ: A choreographed model for Fork-Join Workflow in Serverless Computing

Function-as-a-Service (FaaS) is an event-based reactive programming model where functions run in ephemeral stateless containers for short duration. For building complex serverless applications, function composition is crucial to coordinate and synchronize the workflow of an application. Some serverless orchestration systems exist, but they are in their primitive state and do not provide inherent support for non-trivial workflows like, Fork-Join. To address this gap, we propose a fully serverless and scalable design model ReactiveFnJ for Fork-Join workflow. The intent of this work is to illustrate a design which is completely choreographed, reactive, asynchronous, and represents a dynamic composition model for serverless applications based on Fork-Join workflow. Our design uses two innovative patterns, namely, Relay Composition and Master-Worker Composition to solve execution time-out challenges. As a Proof-of-Concept (PoC), the prototypical implementation of Split-Sort-Merge use case, based on Fork-Join workflow is discussed and evaluated. The ReactiveFnJ handles embarrassingly parallel computations, and its design does not depend on any external orchestration services, messaging services, and queue services. ReactiveFnJ facilitates in designing fully automated pipelines for distributed data processing systems, satisfying the Serverless Trilemma in true essence. A file of any size can be processed using our effective and extensible design without facing execution time-out challenges. The proposed model is generic and can be applied to a wide range of serverless applications that are based on the Fork-Join workflow pattern. It fosters the choreographed serverless composition for complex workflows. The proposed design model is useful for software engineers and developers in industry and commercial organizations, total solution vendors and academic researchers.

Pervasive Smart Spaces and Environments: A Service-Oriented Middleware Architecture for Wireless Ad Hoc and Sensor Networks

In the twenty-first century, the impact of wireless and ubiquitous technologies is changing the way people perceive and interact with the physical world. These communication paradigms promise to change and redefine, in a reasonably short period of time, the most common way of our everyday living. The continuous advances in the field of Wireless Sensor Networks and their direct application in Smart Spaces are clear examples of it. However, in order for this kind of new generation infrastructures to have a large-scale dissemination, there are still some open issues to tackle. In this way, this paper presents nSOM, a service-oriented framework based on sensor network design that provides internetworking services with the Internet cloud. This lightweight middleware architecture implements an agent-based virtual sensor service approach which is a compact semantic knowledge management scheme based on a dynamic composition model.

A business model for dynamic composition of telecommunication web services

Web service composition is a mechanism for creating new web services from existing Web services. Web service composition enables rapid service creation by reusing existing services. Dynamic composition is composition at runtime. A business model defines the different parties involved in service provisioning and their relationships. However, the existing business models are not suitable for Web service composition. This article proposes a novel business model for dynamic web service composition that is an extension of the standard web service business model. The proposed model is demand-driven, where services can be dynamically composed based on the demand for them. We introduce new business roles and new interactions. We have provided a UDDI-based implementation of our new model by proposing extensions to the subscription API of UDDI. We have developed a proof-of-concept prototype, and have made some preliminary performance measurements. The performance analysis shows that the UDDI extensions incur acceptable performance penalization.

Development of intelligent reusable learning objects for web-based education systems

The research in WBE (Web-based Education) systems is centered in reusability, accessibility, durability and interoperability of didactic materials and environments of virtual education. A special type of labeled materials called Intelligent Reusable Learning Components Object Oriented (IRLCOO), producing learning materials with interface and functionality standardized, rich in multimedia, interactivity and feedback is described in this paper. The structuring model for dynamic composition of these components is based on the concept graph knowledge representation model. The multi-agent architecture as a middleware for open WBE systems is developed for sequencing and delivery of learning materials composed of IRLCOOs.

Development of Reusable Learning Materials For Wbe Using Intelligent Components And Agents

The research in WBE systems is centred in reusability, accessibility, durability and interoperability of didactic materials and environments of virtual education. In this article, a special type of labelled materials called intelligent Reusable Learning Components (RLC), producing learning materials rich in multimedia, interactivity and feedback is described. The structuring model for dynamic composition of these components is based on the concept graph knowledge representation model. The multiagent architecture as a middleware for open WBE system is developed for sequencing and delivery of learning materials composed of RLCs.