Providing Extensibility and Configurability to Event Notification Services

Publish/subscribe services, specifically notification servers, are used as the middleware for the implementation of a large set of collaborative software engineering tools. With their popularization, many notification servers are being developed to support specific application domains. At the same time, general-purpose notification servers provide a large set of functionality for a broad set of applications. As a result, developers face the dilemma of choosing between application-specific or general-purpose notification servers. In both cases, however, the set of features provided by the servers are neither extensible nor configurable, hindering the use of these infrastructures in different application domains, making it difficult to add support for new functionality. In this work, we describe a more flexible approach – a customizable, extensible and dynamic architecture for notification services, which allows the configuration of the notification service to different application domains. The design and implementation of the system are discussed, as well as configuration ex-