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Design of an Online Voting System

Design of an Online Voting System. Adrian Ilie & Miguel A. Otaduy. COMP 204, Spring 2001. Design Goals. handle elections of any kind at any administrative level provide an easy-to-use on-line (web-based) interface allow both a distributed and a stand-alone system organization.

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Design of an Online Voting System

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  1. Design of an OnlineVoting System Adrian Ilie & Miguel A. Otaduy COMP 204, Spring 2001

  2. Design Goals • handle elections of any kind at any administrative level • provide an easy-to-use on-line (web-based) interface • allow both a distributed and a stand-alone system organization

  3. Example of a Distributed Election Consider an election day when elections are held at the national, state and local level. Voter data is retrieved from a census database, distributed in three locations.

  4. Structure of a Node FAÇADE • election objects • user objects • managers DB • voters DB • candidates / answers DB • results DB

  5. Connecting the Nodes (1) Having distributed databases means we have to search for data at different nodes... CHAIN OF RESPONSIBILITY

  6. Connecting the Nodes (2) … but it’s distributed! PROXY

  7. Abstract User Class • implements authentication methods • serves as a superclass for concrete user types FACTORY METHOD

  8. User Type: Voter Created at engine with the database that contains the data about it.

  9. User Type: Candidate All interactions are local.

  10. User Type: Manager All interactions are local.

  11. Menus and Actions COMPOSITE FLYWEIGHT

  12. Election Class

  13. Handling Election Types STRATEGY

  14. Communication Issues PROXY

  15. OFF-LINE Application • Creation of proxy objects for remote engines. The local chain is set at each node. Customers have to agree on what nodes are included in the global system. • Creation of election objects and the manager database. • Maintenance of voter and candidate databases.

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