Implementation of a Distributed Document-Based System

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43.4 Server communicationsThe servers use two types of communication with the client, RMI and CORBA. Whichtype the server uses is determined by the administrator and defined in the configuration file. Theserver startup script queries the configuration file, establishes the appropriate communicationsmethod and port (rmiregistry for RMI and tnameserv for CORBA) and starts the server for thattype. New communication methods, such as sockets or Remote Process Communications (RPC)can be implemented as well.3.5 User Guide and Source CodeAppendix A gives the user guide for the application.4 Project ImprovementsThis technology demonstrator would require several refinements before it could be readyfor use in a business. The configuration file would be replaced with a database so that optimizedqueries could be executed against the file records. An administration tool would decrease thelevel of effort for the administrator and reduce the chance of data entry errors. The number andtype of documents supported would have to be increased to be valuable to a user community.Security and data integrity are not addressed in this project and defining access for groups ofusers could be handled in the database. The local caching of files could be improved by a bettermethod of comparison than the file size and the last modified date. The last modified date of afile is particularly vulnerable to inconsistent data problems because it relies on the physicalclocks of the machines. The caching method would benefit from a means of guaranteeing eventorder processing such as Lamport timestamps [3].5 ConclusionsA company probably cannot simply use a commercial PLM system and may not beinterested in developing and supporting a total in-house solution. A choice that many aerospacecompanies have chosen is to place the documents critical to the life of the business (such asEngineering design data) in a PLM system and develop a user interface which includes the PLMsystem and their legacy document systems.References[1] UGS Teamcenterhttp://www.ugs.com/about_us/success/hendrick.shtml[2] Dassault Systemes ENOVIAhttp://www.3ds.com/your-strategy/customers-stories/story-description/story/32/1/
5[3] Andrew S. Tanenbaum and Maarten van Steen Distributed Systems: Principlesand Paradigms Prentice Hall, 2002, ISBN: 0-13-088893-1[4] Microsoft Windows SharePoint Serviceshttp://www.microsoft.com/windowsserver2003/technologies/sharepoint/default.mspx
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Implementation of a Distributed Document-Based System

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