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Rapid response times and interactivity are important requirements of ROIA delivery, that cannot be delivered by existing Grid technology. In order to address this, edutain@grid will develop a service oriented architecture comprising three layers that will separate transaction and deployment activities from real-time delivery mechanisms:
- Business layer. This will handle transactions between ROIA customers and suppliers, Service Level Agreements between ROIA suppliers and hardware hosts, security arrangements etc. Transactions will be handled using a web services’ approach.
- Management layer. This layer will determine how ROIAs should be deployed to meet current user demand, in accordance with SLA negotiations that have been conducted in the Business Layer. The Management Layer will also be based upon web services.
- Real time layer. In this layer, the ROIAs are executed using resources assigned to them through the Management Layer. It is this layer that provides rapid response and interaction times, partly because it is freed from commercial and Grid management considerations. Web services are not suitable for this task due to the constraints of bandwidth and communication protocol latency. Therefore, response and interaction will be further improved through the development of a platform-independent API, enabling ROIAs to exploit real-time protocols. The layer provides a novel middleware technology, the Real-Time Framework (RTF), for a high-level development of scalable real-time online services through a variety of parallelization and distribution techniques. It enables real-time services to adapt themselves during runtime to an increased/decreased user demand and preserve QoS by adding resources transparently for the users. The integrated monitoring and controlling facilities offer an open interface for the runtime resource management of ROIA services.
Grid accessibility is currently constrained by security models, usually involving certification of trusted community members with common goals. This will be too slow for ROIA applications and does not allow for access to ROIAs by unknown third parties. edutain@grid is investigating more flexible approaches, which also recognise that some parties may have malicious motives. This analysis involves several possible business models that include a number of different actors within the delivery chain.
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