Um mecanismo de tratamento de excessões sensível ao contexo para sistemas ubíquos orientados a tarefas

• Ano de defesa: 2012
• Autor(a) principal: Queiroz Filho, Carlos Alberto Batista de
• Orientador(a): Andrade, Rossana Maria de Castro
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Palavras-chave em Português: Ciência da computação; Tratamento de exceções; Sistemas ubíquos; Sensibilidade ao contexto; Sistemas orientados a tarefas; Exception handling; Ubiquitous systems; Context awareness; Task-oriented systems
• Link de acesso: http://www.repositorio.ufc.br/handle/riufc/17525

The main purpose of ubiquitous computing is to provide information and features needed to help people in their daily tasks, proactively and transparently, at any time and anywhere. The development of ubiquitous systems involves a set of challenging requirements, including: context awareness, which allows systems to adapt their behavior to respond appropriately in the face of environmental changes, and dependability, which is related to the ability of systems provide a service which offer strong indications that are reliable. Regarding the attributes of dependability, neglecting them can bring grievances from small to severe risks to the physical integrity of the users. Exception handling is a major fault tolerance techniques used in software development to achieve greater levels of dependability. This technique, even though it is widely used in traditional software development, it is still not widely used in the development of ubiquitous systems. This is due to challenging requirements and characteristics of this type of system, among which we highlight the sensitivity to the context and distribution, which can make the necessary possibilities of handling exceptions in a system as a whole is greater than the sum of possibilities for exception handling of the parts that compose it. Therefore, this dissertation aims to propose a mechanism for exception handling context-sensitive ubiquitous systems for task-oriented. The proposed mechanism is available through a framework called foreheads, which allows the reuse mechanism. By using this framework, system functionality can be implemented on an abstraction task, which responds appropriately to changes in context, detecting and treating exceptional situations. To validate the proposed mechanism was implemented a prototype system of parking control ubiquitous as a proof of concept, which focuses on demonstration of how the tasks are implemented that make up this system and how they are defined exceptions contextual and their handlers.