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COOTS 2001 Abstract
Content-Based Publish/Subscribe with Structural Reflection
Patrick Th. Eugster and Rachid Guerraoui, Swiss Federal Institute of Technology, Switzerland
Abstract
This paper presents a pragmatic way of
implementing content-based publish/subscribe
in a strongly typed object-oriented language.
In short, we use structural reflection to implement filter objects through which
applications express their subscription patterns. Our approach is
pragmatic in the sense that it alleviates the need for any specific
subscription language. It preserves encapsulation of message objects
and helps avoiding errors. We illustrate our approach in the context of
Distributed Asynchronous Collections (DACs), programming abstractions
for message-oriented interaction. DACs are implemented in Java, whose inherent reflective
capabilities fully satisfy the requirements of our
content-based subscription scheme. Our approach is
however not limited to the context of DACs, but could be put to work
easily in other existing event-based systems.
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