Run-time object-synthesis and transparent client/server updating of distributed objects using a meta server of all object descriptors (US5920725)

a network connection on a server running the server objects, the network connection for transmitting and receiving packets from a plurality of remote clients running the client objects;
a meta database for providing persistent storage of cataloged object descriptors for object classes in the distributed-object client-server application;
a meta server, coupled to the meta database, for receiving change requests, the meta server reading object descriptors from the meta database and writing modified and new object descriptors to the meta database in response to the change requests, the meta server cataloging object descriptors;
a compiler, coupled to the meta server, for compiling the modified and new object descriptors from the meta server, the compiler outputting newly-compiled class definitions;
an object adaptor, receiving the newly-compiled class definitions, for creating new server objects and new client objects using the newly-compiled class definitions, the object adaptor invalidating obsolete objects on the server and on the plurality of remote clients, the obsolete objects made obsolete by the change requests; and
wherein other server objects and other client objects continue to run while the object adaptor invalidates the obsolete objects and creates the new server objects and the new client objects,
an application database on the server, containing data used by the distributed-object client-server application, the application database read and written by server objects in response to requests by client objects;
wherein the meta server includes structure-update means for updating field definitions in the application database in response to the change requests,

whereby a structure of the application database is changed when the server objects and the client objects are updated and whereby the distributed-object client-server application is updated while running.

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	Foreign References:			None
	Other References:			The Gemstone Object Database Management System, Butterworth et al., Communications of the ACM, Oct. 1991/vol. 34, No. 10. Seltzer, "Future Distributed Computing", PC Mag. Mar. 25, 1997, pp. 198-204.
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