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Collaborative Design using a Distributed Block Diagram Editor

Collaborative Design using a Distributed Block Diagram Editor. Robert Lechner Computer Science Department University of Massachusetts - Lowell Rit Chiang Electrical Engineering Department Merrimack College. Presented at New England Telecommuncations Conference UMass-Lowell November 1994.

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Collaborative Design using a Distributed Block Diagram Editor

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  1. Collaborative Design using aDistributed Block Diagram Editor Robert Lechner Computer Science Department University of Massachusetts - Lowell Rit Chiang Electrical Engineering Department Merrimack College Presented at New England Telecommuncations Conference UMass-Lowell November 1994

  2. Organization of DBDE Talk 1. Distributed Graphic Editing - 10 minutes (Rit Chiang) 2. Telecommunication Issues - 15 minutes (Rit Chiang) 3. Persistent Database Issues - 20 minutes (R. Lechner) 4. Communication Protocols - backup (R. Lechner)

  3. Computer-SupportedCooperative Work (CSCW) • Message Systems • Text only, no graphics • Application Sharing • X-Windows Protocol • Distributed Text Editing • Video Conferencing • Bit-mapped Graphics • Distributed Diagram Editing (DBDE) • Block Diagrams • Persistent Database

  4. Client/Server Communications(DBDE) Remote Dial-up Client Local Client Narrow-band Dial-up Links DBDE Server Wide-band LAN Data Wide-band WAN Data Local Client Remote Workstation Client

  5. Client/Server Communications DBDE Server (Global Database) File Uploads, LocalDB Updates and Selections File Downloads, GlobalDB Updates and Selections (active clients only) (active and passive clients) DBDE Client (Local Database + X11/MSWin GUI)

  6. Client/Server Functions (STD) LEAVE MTG JOIN MTG Session management REJOIN GET INFO VIEW INFO Movement of files DOWNLOAD UPLOAD CATCH-UP (private) Passive reception (shared) BCREAD Interactive editing BCEDIT BCHOLD Database check-pointing

  7. Client/Server Interactions LEAVE MTG JOIN MTG REJOIN Interact with session manager Server-client communication over a direct private channel: GET INFO VIEW INFO Interact with database server . DOWNLOAD File Transfer Mode UPLOAD Incremental Updates CATCH-UP Server broadcasts serialized updates to all. BCREAD Some clients interact BCEDIT (Broadcasts on hold whenever server check-points the database) BCHOLD

  8. Session Management Data Model SN Session FI File PE Person exclusive access • AP Auth-Pe • (authorization) intervvals of time joiners clients DF Diagram File* AF Admin File SI Session Interval SC Session Client (based on this schema) AD Active Diagram Composite Object Data Model CT Client Transaction ( represents a 1:1 to 0:M association) * A DE file may contain multiple block diagrams. ** This data model applies to all block diagrams types. *** Selections imply menu, cursor and highlight states.

  9. Composite Object Data Model FV File Version Generic Text Class XB Text Block SY Symbol Graph Class GG Generic Graph GC GraphCaption TK Token CX Caption Text Node Class GN Graph Node GA Node Attribute Link Class GL Graph Link GI Link Identifier GP Link Bendpoint

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