In pervasive environments, services are fastly developing and are being deployed everywhere. In this article, we introduce a Servicebook, a new social network of services, where services create and join group of service profile providing to users better access to all the services in their vicinity. We propose a novel technique to realize this Servicebook, the userexcentric service composition. This user-excentric composition relies on two service relations: the compatible relation and the composition relation. We developed and evaluated an OSGiprototype as a proof-of-concept.
This article describes middleware by adopting a horizontal and a vertical layer views. Middleware are enabling technologies for application development and execution in ubiquitous environments. In the horizontal view, we find most types of middleware developed so far, such as MOM, ORB, databases middleware and more recently SOA. Two new concepts emerged in this category, the "middleware of sensors" and the "middleware of middlewares". The vertical layer distinguishes two essential properties that characterize nowadays middleware and define what is called to be the ubiquitous middleware and the self-* middleware. This article briefly explains all these key words and exposes the directions in which these new areas of research could proceed. It than introduces the spontaneous middleware as a new property for ubiquity in the vertical layer and highlights what spontaneity brings to the different types of middleware.
Ubiquitous computing environments are highly dynamic by nature. Services provided by different devices can appear and disappear as, for example, devices join and leave these environments. This article contributes to the handling of this dynamicity by discussing service integration in the context of service-oriented architectures. We propose C-ANIS: a Contextual, Automatic and dyNamic Integration framework of Services. C-ANIS distinguishes two different approaches to service integration. Automatic integration automatically extends the capabilities of an existing service, leaving the interface unchanged. On-demand integration builds a new service on request from a list of given services. We have implemented C-ANIS based on the OSGi/Felix framework and thereby demonstrated the feasibility of these two service integration concepts. We have also implemented a toolkit providing two different techniques to realize the automatic and on-demand service integration concepts: Redirection, i.e. calling interfaces and replication, i.e. copying implementations of services 1 .
Abstract-One of the challenges of ambient systems lies in providing all the available services of the environment to the ambient devices, even if they do not physically host those services. Although this challenge has come to find a solution through cloud computing, there are still few devices and operating systems that enable applications execution by only uploading the required components into the runtime environment.The ROCS (Remote OSGi Caching Service) framework is a novel proposal which relies on a heavy-weighted standard Java/OSGi stack. It is distributed between class servers and ambient devices to provide full functionalities to resource-constrained environments. The ROCS framework provides improvements in two areas. First, it defines a minimal bootstrap environment that runs a standard Java/OSGi stack. Secondly, it provides an architecture for loading any necessary missing class from remote servers into memory at runtime.Our first results show similar performances when classes are either remotely downloaded into the main memory from a local network or from a flash drive. These results suggest a way to design minimalistic middleware that dynamically obtain their applications from the network as a first step towards cloud-aware operating systems.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.