23 November 1999Sticky Technology for Augmented Reality Systems Brian Parkison Workflow Team STARS Project Carnegie Mellon University 23 November 1999 Object Design Review

23 November 1999Sticky Technology for Augmented Reality Systems 2 submitDocument Scenario Jack, an IETM author in Montana, finishes his first draft and needs to submit it to the Authoring Database for review. (submitDocument()) The DBClient notices that this is the first time Jack has accessed the database, and asks him to login. (authenticateUser(), which is not a public method)

23 November 1999Sticky Technology for Augmented Reality Systems 3 submitDocument (cont) After successful authentication, the DBClient initiates a call to the DBServer to carry out the submit request. (API undecided) Upon successful completion of the task, the ID of the newly submitted document is returned. Jack realizes this is the last thing he needs to do today, and logs out. (logout())

23 November 1999Sticky Technology for Augmented Reality Systems 4 DBClient NetworkClient 1 1 NetworkServer * 1 RMI DBServer 1 1 STARS DB 1 1 Authentication LotusServer Notification JDBC *1 Client MachineSTARS DB Server Object Model (Simplified)

23 November 1999Sticky Technology for Augmented Reality Systems 5 Notes on the Object Model Other subsystems should only interact with the DBClient. The DBServer creates threads for each connection from the NetworkServer. As a result, the authentication and notification subsystems will be thread-safe.

23 November 1999Sticky Technology for Augmented Reality Systems 6 Infamous Document It is an interface void addSubscriber(String username) String getDatatype() Collection getAuthorizedReaders() Collection getAuthorizedWriters() Collection getSubscribers() Collection getSearchableData()

23 November 1999Sticky Technology for Augmented Reality Systems 7 API int submitDocument(Document data) Document retrieveDocument(int docID, String datatype, boolean forReading) int updateDocument(int docID, Document data) Collection listDocuments(Collection criteria, Collection desiredFields)

23 November 1999Sticky Technology for Augmented Reality Systems 8 API (cont) void addSubscriber(String username, int DocID, String datatype) String getUsername() void logout() Javadoc:

23 November 1999Sticky Technology for Augmented Reality Systems 9 Hardware Requirements Client: PEDD, desktop – we’re not the bottleneck in hardware needs! Server: Dedicated STARS DB Server with GB of disk space. Client/Server: Any network connection, but the faster, the better.

23 November 1999Sticky Technology for Augmented Reality Systems 10 Software Requirements Client: JavaRMI Server: JavaRMI. Also, LotusNotes must be running for authentication and notification. The database subsystem also needs a database backend to store all of the data.

23 November 1999Sticky Technology for Augmented Reality Systems 11 Notes About the Database LotusNotes has a 254 character limit on field sizes when using JDBC. LotusNotes only supports JDBC 1.1. Workflow is currently looking at other DBMS’s to use as the backend.

23 November 1999Sticky Technology for Augmented Reality Systems 12 Database Fields The fields need to be specified to the Workflow team ahead of time. Workflow will be adding additional fields, mostly for internal management. These fields will be accessible by other subsystems.

23 November 1999Sticky Technology for Augmented Reality Systems 13 Added Fields previous_version current_writer serialized_data These field names cannot be used by other subsystems!

23 November 1999Sticky Technology for Augmented Reality Systems 14 Status of Subsystem Working on implementation Interface to front end is defined and ready to implement Back end server access to database is proceeding in earnest Authentication and Notification subsystem are somewhat lacking in code RMI is in the works

23 November 1999Sticky Technology for Augmented Reality Systems 15 Timeline Implementation Nov 23rdDec 5th Unit Testing Dec 1st Integration Testing Dec 9th We have not decided on the exact order of implementation for each subsystem. We’ll take whatever we can get.

23 November 1999Sticky Technology for Augmented Reality Systems 16 Open Issues Is RMI the best way to do the networking? What database will replace LotusNotes? How do we deal with dead network connections? How are we going to implement and test all of this in a timely manner?