G.: SP2A: a Service-oriented Framework for P2P-based Grids

Service-Oriented Architectures (SOAs) are rapidly becom-ing the key approach for achieving new levels of interoper-ability and scalability in the development of Grid applica-tions. Within SOA solutions, current approaches for adver-tising service providers and for allowing prospective clients to discover them are mostly based on centralized registries. Envisioning Virtual Organizations in which all participants are both resource providers and consumers, in a peer-to-peer fashion, seems to be an appealing approach. In this paper we propose the Service-oriented Peer-to-Peer Architecture (SP2A), a framework enabling peer-to-peer re-source sharing in Grid environments. Resources are not di-rectly exposed but can be accessed through Resource Pro-vision Services, whose semantically enriched interfaces are published in the network. The framework has been imple-mented as a Java API, which currently supports a number of important technologies such as JXTA (peer-to-peer rout