Enterprise distributed real-time and embedded (DRE) systems are
increasingly being developed with the use of component-based software
techniques. Unfortunately, commonly used component middleware platforms
provide limited support for event-based publish/subscribe (pub/sub)
mechanisms that meet both quality-of-service (QoS) and configurability
requirements of DRE systems. On the other hand, although pub/sub technologies,
such as OMG Data Distribution Service (DDS), support a wide range of QoS
settings, the level of abstraction they provide make it hard to configure them
due to the significant source-level configuration that must be hard-coded at
compile time or tailored at run-time using proprietary, ad hoc configuration
logic. Moreover, developers of applications using native pub/sub technologies
must write large amounts of boilerplate ``glue'' code to support run-time
configuration of QoS properties, which is tedious and error-prone. This paper
describes a novel, generative approach that combines the strengths of
QoS-enabled pub/sub middleware with component-based middleware technologies.
In particular, this paper describes the design and implementation of DDS4CIAO
which addresses a number of inherent and accidental complexities in the DDS4CCM
standard. DDS4CIAO simplifies the development, deployment, and configuration
of component-based DRE systems that leverage DDS's powerful QoS capabilities by
provisioning DDS QoS policy settings and simplifying the development of DDS
applications.