Data management for location-dependent mobile applications

• Autor(a) principal: Santos, Nuno Miguel Fiúza Martins Boavida dos
• Data de Publicação: 2023
• Tipo de documento: Dissertação
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10362/157054
• topic: Distributed systems; dynamic consistency; geographic data; replication; mobile applications; Domínio/Área Científica::Engenharia e Tecnologia::Engenharia Eletrotécnica, Eletrónica e Informática

Over the last decade, the number of mobile applications that rely on geolocated data has increased substantially. In many cases, the users of such applications demonstrate a greater interest in data that is located in their close vicinity, than that which is located further away from them, whether it be in terms of detail or in terms of the freshness of the data. In this dissertation, we present FocusDB, a data management system designed to support this type of application, as well as the interaction between clients and servers based on geolocated data. This system proposes a novel data model where the information is kept with several levels of detail, with the applications defining the relevant levels. The clients access the data in such a way that the distance of the client to the data object can dictate its level of detail. Additionally, the users are notified whenever their data is modified, avoiding them having to repeatedly request the server for updates. The performance of the system shows gains in performance when compared to industry standards and opens the door for more research endeavors related to location-aware distributed systems.