Article Preview
Top1. Introduction
Mobile service development and provisioning have become main focuses of nowadays researches because of the huge improvements in mobile device capabilities and the vast availability of wireless networks. As in the traditional Service Oriented Architecture (SOA) (Erl, 2005) researches, context-awareness (Abowd et al., 1999) and self-adaptation (Garlan, Cheng, Huang, Schmerl, & Steenkiste, 2004) have been the main approaches proposed to enable and leverage SOA capabilities in mobile systems (Papakos, Capra, & Rosenblum, 2010; Hoang; & Chen, 2010; Paspallis, 2008; Alkhabbas, Spalazzese, & Davidsson, 2017).
Service mobility has been proposed in ad-hoc networks to support services sharing and consuming on the fly between mobile devices (AlShahwan, Carrez, & Moessner, 2012; Wagh & Thool, 2014; Zuo & Liu, 2015). A service can be moved to perform location-based tasks (i.e., device tracking or search for surrounding devices), to process data on other devices and/or to temporally use resources of available devices in the network (such as processing power or sensors). In order to enable service mobility between mobile devices, a shared semantic understanding between devices to express the status of their specifications and requirements. Additionally, it is required to provide a semantic description to define services specifications and properties. Contextual information such as location, speed, hosted services, and service description must be semantically presented and dynamically generated to provide a real-time information and status of the participating devices and services in the system.
The possibility of having several adaptation plans for a client’s service to move over a set of possible destination hosts requires a decision making process. This process provides the adaptation system with a selection mechanism to decide where to migrate its service based on defined criteria that affect service quality and system adaptation in different levels.
In this work, we demonstrate a traffic jam detection scenario in peer-to-peer network as the proof-of-concept to the applicability of the Mobile Web service migration framework in Kazzaz and Rychlý (2017). The framework is proposed to enable service provisioning and migration in Mobile SOA by providing system adaptation to context changes of the mobile device resources. The provided case study presents the reusability of the demonstrated migration framework by adopting a traffic jam detection scenario and extending system ontology and decision-making process introduced in (Kazzaz & Rychlý, 2015).
This work is motivated by the traffic jam scenarios presented in (Riva, Nadeem, Borcea, & Iftode, 2013; Weyns, Malek, & Andersson, 2010) where the migration framework is installed on a group of cooperative cars. A car 𝐴, can plan its route from point 𝑋 to point 𝑌 and investigate a traffic jam possibility on this route. The traffic jam investigation is performed through migrating TrafficJamSearch service of car 𝐴 and running it on another car 𝐵 (i.e., a new service provider) located in the area of interest (AOI) defined by car 𝐴. By calling the migrated service, car 𝐴 will acquire the required information in order to plan a better route by avoiding traffic jams.
In this example, there are two criteria governing the service migration decision making process:
- 1.
SpeedCriteria: represents the speed difference between a subject car 𝐴 and the destination car 𝐵, and
- 2.
CenterDistanceCriteria: represents the distance of destination car 𝐵 from the AOI’s center of car 𝐴.