RT - CRM : Real - Time Channel - based Re ective

In this paper, we propose and present Real-Time Channel-based Reeective Memory (RT-CRM) { a useful programming model and middleware communication service for constructing distributed real-time industrial monitoring and control applications on commercially available open systems. RT-CRM provides remote real-time data reeection abstraction using a simple writer-push model. This writer-push approach enables us to easily decouple the QoS characteristics of the writers from that of the readers. This decou-pling is crucial in supporting diierent kinds of remote data transfer and access needs that one often nds in distributed industrial systems. We will describe the design of RT-CRM, along with a set of easy-to-use API to access the RT-CRM service. We have implemented RT-CRM as part of a larger real-time middle-ware project, MidART. We address many of the important implementation issues including buuer management and QoS support. We demonstrate the fea-siblity of RT-CRM through a discussion of our application programming support and preliminary performance data.