<p>Event monitoring has been employed in many applications such as network monitoring, active databases etc.; however, there is only an insignificant amount work done on parameterized event monitoring, a feature that is necessary in any real application. The aim of this work is to investigate solutions for parameterized event composition that is scalable and efficient; these solutions are refined from existing event monitoring algorithms. An algorithm for parameterized event composition is proposed and analysis on algorithmic time complexity is performed. In addition to this, experiments on the prototype Solicitor, a software component in DeeDS, along with simulated input of events are conducted in order to validate the theoretical model and the hypothesis that were made. The experiments support the theoretical model and suggest that it is possible to build an efficient and scalable parameterized event composition that is useful in real applications.</p>

Event monitoring has been employed in many applications such as network monitoring, active databases etc.; however, there is only an insignificant amount work done on parameterized event monitoring, a feature that is necessary in any real application. The aim of this work is to investigate solutions for parameterized event composition that is scalable and efficient; these solutions are refined from existing event monitoring algorithms. An algorithm for parameterized event composition is proposed and analysis on algorithmic time complexity is performed. In addition to this, experiments on the prototype Solicitor, a software component in DeeDS, along with simulated input of events are conducted in order to validate the theoretical model and the hypothesis that were made. The experiments support the theoretical model and suggest that it is possible to build an efficient and scalable parameterized event composition that is useful in real applications.

Made available in DSpace on 2014-12-17T15:47:45Z (GMT). No. of bitstreams: 1 FredericoASL.pdf: 1144555 bytes, checksum: 05531a7c277b2d737fe8510e3a7ede26 (MD5) Previous issue date: 2008-02-15 / Pervasive applications use context provision middleware support as infrastructures to provide context information. Typically, those applications use communication publish/subscribe to eliminate the direct coupling between components and to allow the selective information dissemination based in the interests of the communicating elements. The use of composite events mechanisms together with such middlewares to aggregate individual low level events, originating from of heterogeneous sources, in high level context information relevant for the application. CES (Composite Event System) is a composite events mechanism that works simultaneously in cooperation with several context provision middlewares. With that integration, applications use CES to subscribe to composite events and CES, in turn, subscribes to the primitive events in the appropriate underlying middlewares and notifies the applications when the composed events happen. Furthermore, CES offers a language with a group of operators for the definition of composite events that also allows context information sharing / Aplica??es pervasivas usam o suporte de middlewares de provis?o de contexto como infra-estruturas para prover informa??es contextuais. Tipicamente, essas aplica??es utilizam comunica??o baseada em eventos de forma a eliminar o acoplamento direto entre componentes e permitir a dissemina??o seletiva de informa??es baseada nos interesses dos elementos comunicantes. O uso de mecanismos de composi??o de eventos em conjunto com tais middlewares faz-se necess?rio para agregar eventos individuais de baixo n?vel, oriundos de fontes heterog?neas, em informa??es contextuais de alto n?vel relevantes para a aplica??o. Esse trabalho prop?e o CES (Composite Event System), um mecanismo de composi??o de eventos que trabalha em coopera??o com mais de um middleware de provis?o de contexto simultaneamente. Com essa integra??o, aplica??es utilizam o CES para fazer subscri??es a eventos compostos e este, por sua vez, faz a subscri??o dos eventos primitivos nos middlewares apropriados e notifica as aplica??es quando os eventos compostos ocorrem. Al?m disso, o CES oferece uma linguagem com um conjunto de operadores para defini??o de eventos compostos que tamb?m permite o compartilhamento de informa??es contextuais