Object Interconnections Comparing Alternative Programming Techniques for Multi - threaded CORBA Servers ( Column 7 ) Douglas C

Developers of multi-threaded servers face many challenges. One important challenge is selecting a suitable concurrency model. There are several concurrency models to choose from including thread-per-request, thread-pool, and threadper-session. Our last two columns discussed the thread-perrequest and thread-pool concurrency models, respectively. We showed how each could be used to develop multi-threaded server programs for a distributed stock quote application. This column discusses the thread-per-session model, in which each new session created for a client is assigned a thread that processes requests for that session. Following the format of our recent columns, this column will illustrate the thread-per-session model by developing new multi-threaded stock quote servers using C, C++ wrappers, and CORBA.