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CORBA & VisiBroker

As was alluded to above, VisiBroker was chosen as the CORBA implementation used for VCS because it was the only ORB available that had C++ bindings and supported several different hardware/software platforms of interest (various UNIX systems, Windows, and plans for a Macintosh release). It has proven to be a good choice in that the VisiBroker system is an extremely flexible system. It has plenty of capability, has been reasonably bug-free  and has a very responsive customer service department. Performance has been adequate after we overcame an early major performance problem. We say adequate because it is competitive with other systems available, but not as good as one would like when comparing it to a raw socket-type interface.

Visigenic has provided The Company their Beta version of VisiBroker that is said to be a CORBA 2.0 compatible product . VCS utilizes this latest version prior to its commercial release from Visigenic.

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Object persistence and object query capabilities are fairly new areas for CORBA. As such these capabilities are not yet generally available with commercial CORBA products. Our initial implementation of the VCS objects used flat data files to store each object's data. Since then we have integrated Sybase with VisiBroker to maintain persistence of the VCS objects. Sybase is a commercial object oriented database system available from Sybase Corporation. We have put backend server objects on Sun Solaris machines and Digital Alpha servers. We hope to port to Windows/NT in the near future (the major pieces that would facilitate a port appear to be in place).

VisiBroker extensions used during development of VCS: we have attempted to stay entirely within the current CORBA standard and within features offered by other CORBA system vendors. There are some VisiBroker system features we currently use that will be porting issues. These features are filters, transformers, loaders, smart proxies, TIEs, and multithreaded servers. What these features are, the context in which they are used, and possible strategies to avoid their use, will be described as development progresses.

  VIMS