End-User Service Composition in Mobile Pervasive Environments (original) (raw)

Satisfying requirements for pervasive service compositions

Proceedings of the 7th Workshop on Models@run.time - MRT '12, 2012

Pervasive environments are characterised by highly heterogeneous services and mobile devices with dynamic availability. Approaches such as that proposed by the Connect project provide means to enable such systems to be discovered and composed, through mediation where necessary. As services appear and disappear, the set of feasible compositions changes. In such a pervasive environment, a designer encounters two related challenges: what goals it is reasonable to pursue in the current context and how to use the services presently available to achieve his goals. This paper proposes an approach to design service compositions, facilitating an interactive process to find the trade-off between the possible and the desirable. Following our approach, the system finds at runtime, where possible, compositions related to the developer's requirements. This process can realise the intent the developer specifies at design time, taking into account the services available at runtime, without a prohibitive level of pre-specification, inappropriate for such dynamic environments.

A Framework for Automatically Supporting End-Users in Service Composition

The Smart Internet, 2010

In Service Oriented Architecture (SOA), service composition integrates existing services to fulfill specific tasks using a set of standards and tools. However, current service composition techniques and tools are mainly designed for SOA professionals. It becomes challenging for end-users without sufficient service composition skills to compose services. In this paper, we propose a framework that supports end-users to dynamically compose and personalize services to meet their own context. Instead of requiring end-users to specify detailed steps in the composition, our framework only requires the endusers specify the goals of their desired activities using a few keywords to generate a task list. To organize the task list, we analyze the historical usage data and recover the control flows among the tasks in the task list. We also mine the task usage pattern from the historical usage data to recommend new services. A prototype is designed and developed as a proof of concept to demonstrate that our approach enables end-users to discover and compose services easily.

User-Excentric Service Composition in Pervasive Environments

2010 24th IEEE International Conference on Advanced Information Networking and Applications, 2010

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.

Assisted Service Composition for End Users

2010

Involving people who do not have programming background in assembling and tailoring service-based applications promises to open up access to the creativity of millions of users. An increasing number of development environments aim to do this by offering drag-and-drop visual representations connecting different service components into an assembly. In contrast to the majority of these, we did not start with the technology but with the users - service producers and consumers, and studied the core issues which should be resolved before people who are not programmers can start to assemble services into meaningful applications, over and above the presentation-level integration offered by current mash-up environments. The result is an assisted approach to service composition for end users, which uses semantic technologies to shield users from the irrelevant complexity of service technology and from the need to manually resolve dependencies between services. The approach was evaluated by a focus group of non-technical users, who ranked it highly and provided valuable suggestions for further improvements and supporting features.

Context-aware pervasive service composition and its implementation

Personal and Ubiquitous Computing, 2011

Incorporating service composition and pervasive computing into managing users' complex everyday activities calls for the Pervasive Service Composition paradigm for everyday life. In this paper, we propose the concept of Context-Aware Pervasive Service Composition (CAPSC), which aims at enabling a pervasive system to provide user service compositions that are relevant to the situation at hand. We investigate CAPSC requirements and design a CAPSC architecture by taking into account context-aware peer coordination, context-aware process service adaptation, and context-aware utility service adaptation. We present a proof of concept application prototype as well.

Context-Aware Service Composition in Pervasive Computing Environments

Lecture Notes in Computer Science, 2006

A major challenge in pervasive computing environments is to provide users with complex, context-sensitive applications, dynamically composed from networked services. In this paper, we present an approach to the dynamic, context-aware composition of services to perform user tasks, i.e., software applications abstractly described on the user's handheld device. Both networked services and user tasks are modeled as semantic Web services in OWLS extended with context information. The distinctive feature of our solution is the ability to compose Web services that expose complex behaviors (conversations) to realize a user task that itself has a complex behavior. Furthermore, the context-related requirements of the task are met by aggregating the context-sensitive behaviors of the individual services.

Service composition for mobile environments

2005

Service Composition, that is, the development of customized services by discovering, integrating and executing existing services has received a lot of attention in the last couple of years with respect to wired-infrastructure or Internet web services. With the advancement in the wireless technology and rapid deployment of mobile devices, we envision that in the near future wirelessly connected mobile devices in a given vicinity will also provide services that can be leveraged in the composition process.

User-centric Services and Service Composition, a Survey

2008 32nd Annual IEEE Software Engineering Workshop, 2008

In this paper, we investigate the various service composition mechanisms and provide the impact of each of them on user-centric service development issues. We classify service composition mechanisms into three categories: automatic service composition, semi-automatic service composition, and static service composition. As services are today mainly driven by the user's needs, the following survey essentially focus on automatic service composition and semi-automatic service composition. This enables users to conceive theirs own personalized applications.

A survey of service composition in ambient intelligence environments

Artificial Intelligence Review, 2011

This article presents a comparative review of systems performing service composition in Ambient Intelligence Environments. Such environments should comply to ubiquitous or pervasive computing guidelines by sensing the user needs or wishes and offering intuitive human-computer interaction and a comfortable non-intrusive experience. To achieve this goal service orientation is widely used and tightly linked with AmI systems. Some of these employ the Web Service technology, which involves well-defined web technologies and standards that facilitate interoperable machine to machine interaction. Other systems regard services of different technologies (e.g. UPnP, OSGi etc) or generally as abstractions of various actions. Service operations are sometimes implemented as software based functions or actions over hardware equipment (e.g. UPnP players). However, a single service satisfies an atomic only user need, so services need to be composed (i.e. combined), in order to provide the usually requested complex tasks. Since manual service composition is obviously a hassle for the user, ambient systems struggle to automate this process by applying various methods. The approaches that have been adopted during the last years vary widely in many aspects, like domain of application, modeling of services, composition method, knowledge representation and interfaces. This work presents a comparative view of these approaches revealing similarities and differences, while providing additional information.