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The CYCLADES Mediator Service

The CYCLADES Mediator Service is a central system component that serves as an entry point to the system. It receives user requests and dispatches them to the appropriate service component, forwarding the results back to the users. It supports user interfaces tailored to individual users and user communities, providing functionalities such as information retrieval, personalization, collection building, recommendation forwarding, and collaborative working spaces.

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The CYCLADES Mediator Service

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  1. The CYCLADES Mediator ServiceDimitris Plexousakisdp@csi.forth.gr Computer Science Department, University of Crete& Institute for Computer Science - FORTHHeraklion, Crete

  2. Description • Functionality (general) • entry point to the system • Mediator component receives requests formulated by the user • Satisfies requests by dispatching them to the appropriate service component • Forwards results to users • Serves users/communities by integrating services

  3. Description • Central system component supporting: • user interfaces tailored to: • individual users • user communities / groups • information retrieval ( search & browse service) • information personalization (personalization service) • collection building ( collection service) • recommendation forwarding to users/groups (recommender service) • virtual working spaces for community members (collaborative work service)

  4. Overall Architecture Recommender Service Collaborative Work Service Mediator Service Collection Service Personalization Service Search & Browse Service Access Service Harvesting mechanisms

  5. Functionality • User Interaction Tasks • User interfaces • information / system description • registration / profiling personalization • services available to users • depending on user type • accessible collections • depending on user type, may include virtual collections • Invokes services • Wraps returned information

  6. Functionality • Service Components Interaction Tasks • dispatching requests following common protocol • Search & Browse Service • forward user query • receive and present query result (stylesheets) • issues: query interface, queries passed on as strings with no wrapping except in common communication format (?) • Collection service • periodic collection of descriptive metadata to determine services available • issues: metadata format (adopt OAMS?)

  7. Functionality • Service Components Interaction Tasks • Personalization Service • obtain user/group profile upon login • pass-on personalization requirements to other services • invoke “ad-hoc” or “on-demand” mode • issues: filtering at the mediator level ? • Recommender Service • forward recommendations • wrap recommendations with query results • acquire user feedback

  8. Functionality • Service Components Interaction Tasks • Collaborative Work Service • establish communication • synchronize collaborative activities • enable information exchange

  9. Summary • Precise functional specification of Mediator Service depends on: • user requirements • functional specification of service components • Approach: • collection independence • common protocol for services (e.g., HTTP) • standard exchange format adoption (e.g., XML) • customizable presentation (e.g., XSLT)

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