The convergence of AOP and active databases: towards reactive middleware
Proceedings of the 2nd international conference on Generative programming and component engineering
EventScript: an event-processing language based on regular expressions with actions
Proceedings of the 2008 ACM SIGPLAN-SIGBED conference on Languages, compilers, and tools for embedded systems
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Active object-oriented database management systems incorporate object-oriented database technology and active mechanisms such as event- condition rules (ECA-rules). SAMOS has been among the first representatives of this class of systems. During the development of SAMOS, numerous then open research questions have been addressed. In this paper, we present a "historical" perspective of the SAMOS project and report on lessons and experiences we gained in the project. We identify requirements, present the solutions we devised, and report on experiences we draw from this project. In particular, we describe the rule model of SAMOS, which represents a smooth integration of ECA-rules into an object-oriented data model. We also discuss the implementation and architecture of the SAMOS prototype on top of a passive object- oriented database system. Furthermore, we report on performance and usability issues. In order to analyze performance, we have developed a benchmark; we discuss the experiences (and improvements) we made by running the benchmark on SAMOS and by comparing the results to those obtained for other systems. Usability issues have been investigated with respect to tool support for designing SAMOS applications and analyzing rule systems. Finally, we discuss experiences in implementing SAMOS and the conclusions we have drawn for the implementation of other types of event-based persistent systems as well as a development method for active systems in general.