A correlation framework for the CORBA component model |
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Authors: | Georg Jung John Hatcliff |
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Affiliation: | (1) Department of Computing and Information Sciences, Kansas State University, 234 Nichols Hall, Manhattan, KS 66506, USA |
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Abstract: | Large distributed systems, including real-time embedded systems, are increasingly being built using sophisticated middleware
frameworks. Communication in such systems is often realized using in terms of asynchronous events whose propagation is implemented
by an underlying publish/subscribe service that hooks components into a generic event communication channel. Event correlation—a mechanism for monitoring and filtering events—has been introduced in some of these systems as an effective technique for
reducing network traffic and computation time. Unfortunately, even though event correlation is used heavily in frameworks
such as ACE/TAO’s real-time event-channel and in mission critical contexts such as Boeing’s Bold Stroke avionics middleware,
the industry standard CORBA Component Model (CCM) does not include a specification of event correlation. While previous proposals
for event correlation usually offer sophisticated facilities to detect combinations in the stream of incoming events, they
have not been constructed to fit within the CCM type system, and they offer relatively little support for transforming and
rearranging filtered events into meaningful output events. In this paper, we present the design rationale, syntax, and semantics
for a new and highly flexible model for event correlation that is designed for integration into the CCM type system. Our model
has been integrated and tested in the Cadena development and analysis framework, which has been designed to support development
of mission-control applications in the Boeing Bold Stroke framework.
This work was supported in part by the US Army Research Office (DAAD190110564), by DARPA/IXO’s PCES program (AFRL Contract
F33615-00-C-3044), by NSF (CCR-0306607) and by Lockheed Martin. |
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Keywords: | Event correlation CORBA component model (CCM) Component system Event communication Event filtering Event type transformation |
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