Stateful publish-subscribe for mobile environments

The Publish-Subscribe paradigm has become an important architectural style for designing distributed systems. In the recent years, we have been witnessing an increasing demand for supporting publish-subscribe for mobile systems in wireless environments. In this paper we present SUBLIM, a stateful model for publish-subscribe systems, which is suitable for mobile systems. In our system, the server maintains a state for each client, which contains variables that describe the properties of particular clients, such as the quality of the connection or the battery utilization. The interest of each subscriber can be expressed in terms of these variables. Based on the subscriber interests, an associated agent is created on the server. The agent filters the data that reach the subscriber based on the content of the message and the current subscriber state. Experimental results show good performance and scalability of our approach.