The convergence of technologies and information-driven applications require a middleware that supports data streams. This middleware needs to interpret, aggregate, filter and analyze streams of messages usually in a distributed environment. Publish/Subscribe middleware basically deals with some of these issues, but it is typically monolithic and includes only a subset of features. A problem arises when users want to find a middleware that completely fulfills their application requirements. Based on our experience, we propose a framework that allows the configuration/adaptation of a Pub/Sub solution based on a reusable and extensible set of components.