Object Request Broker Object Services Application Interfaces Domain Interfaces Common Facilities

The CORBA Event Service provides a exible model for asynchronous communication among objects. However, the standard CORBA Event Service speciication lacks important features required by real-time applications. For instance, operational ight programs for ghter aircraft have complex real-time processing requirements. This paper describes the design and performance of an object-oriented, real-time implementation of the CORBA Event Service that is designed to meet these requirements. This paper makes three contributions to the design and performance measurement of object-oriented real-time systems. First, it illustrates how to extend the CORBA Event Service so that it is suitable for real-time systems. These extensions support periodic rate-based event processing and eecient event ltering and correlation. Second, it describes how to develop object-oriented event dispatching and scheduling mechanisms that can provide real-time guarantees. Finally, the paper presents benchmarks that demonstrate the performance tradeoos of alternative concurrent dispatching mechanisms for real-time Event Services.