With the support of user configurable high speed networks, the emerging e-Infrastructure allows seamless sharing of expensive scientific resources. These resources are often running on a variety of platforms, have different bandwidth and QoS requirements, require specific configuration by technical experts, and in most cases cannot be accessed through a single point of entry. To address these issues, we propose an extensible, reliable, and simple software architecture to share the applications and resources over hybrid networks, and hide the tools' logistical and provisioning complexities.
This paper explores the design and implementation of Eucalyptus, and describes how it leverages the benefits of a Service-oriented Architecture (SoA) to provide a highly adaptable, modular, and loosely coupled solution to configure and manage resources needed by users collaborating over the net. We present our methodology to wrap functions of resources into Web services, and integrate the new Web services into the Eucalyptus platform in a generic way. The streams of the events from these resources are captured. This information is used for monitoring resources' activities and diagnosing any error that may arise. We provide a workflow management service allowing users to orchestrate services based on the description of the resources, their dependencies and the captured streams to perform certain tasks. We also propose a combination of Web services and peer to peer technologies to support users in different communities and different network layers, and to decentralize resource management. Eucalyptus was demonstrated to be effective in assisting architects across multiple sites to effectively participate in a shared design session.