Porting OMTTs to CORBA original.fm

The Common Object Request Broker Architecture standardizes a platformand programming-language-independent distributed object computing environment. It also provides a standard for several distributed services. The Object Transaction Service provides an object-oriented framework for distributed transaction processing, especially for Online Transaction Processing in business applications. The current CORBA OTS allows multithreading inside a transaction, leaving, however, thread coordination to the application programmer, which can be dangerous. Based on the Open Multithreaded Transaction model, we present in this paper the design of a Thread Synchronization Coordinator, ThreadSyncCoordinator, which provides the desired thread control inside a multithreaded transaction. A blocking commit protocol ensures that once in a transaction, a thread cannot leave before the outcome of the transaction has been determined, guaranteeing the ACID properties for multithreaded transactions. We also show how the ThreadSyncCoordinator can be used to design and implement complex applications, e.g., an Online Auction System, in an elegant way.