QoS-Aware Publish-Subscribe Service for Real-Time Data Acquisition

Many complex distributed real-time applications, monitoring and controlling the external environment, require sophisticated processing and sharing of an extensive amount of data under critical timing constraints. In this paper, we present a comprehensive overview of the Data Distribution Service standard (DDS) and describe its QoS features for developing real-time applications. An overview about an active real-time database (ARTDB) named Agilor are also provided. For efficient describing QoS policy in Agilor, a Realtime ECA (RECA) rule model is brought forward based on common ECA rule. And then we propose a novel QoS-aware Real-Time Publish-Subscribe (QRTPS) service compatible to DDS for distributed real-time data acquisition. Furthermore, QRTPS is implemented on Agilor by expressing QRTPS with objects and ECA rules in Agilor. To illustrate the benefits of QRTPS for realtime data acquisition, an example application is presented.