Service-oriented grids for dynamic e-learning environments

Modern Grids are moving towards Service-Oriented Architectures (SOAs) to cope with new distributed applications, beyond traditional massive computing for scientific research. Resource sharing across different e-learning domains in a transparent, seamless and secure way, with wireless support, is the goal of the Grid architecture we have developed. In the first part of the paper we describe Grid Services which cooperate to perform the above task, including discovery and streaming of multimedia objects, content update, and QoS management. The second part of the paper is devoted to the Peer-to-Peer approach we are exploiting to realize a new conception of Grid, where all nodes are potential service providers and contribute to service sharing, discovery and delivery.