FU Berlin, Fachbereich Mathematik und Informatik, Institut für Informatik
G. Cugola, E. Di Nitto, A. Fuggetta
CEFRIEL - Politecnico di Milano
The development of complex distributed systems demands for the creation
of suitable architectural styles (or paradigms) and related run-time
infrastructures. An emerging style that is receiving increasing
attention is based on the notion of event. In an event-based
architecture, distributed software components interact by generating and
consuming events. The occurrence of an event in a component (called
source) is asynchronously notified to any other component (called
recipient) that has declared some interest in it. This paradigm holds
the promise of supporting a flexible and effective interaction among
highly reconfigurable distributed software components.
We have developed an object-oriented infrastructure (and the related
programming framework) to support the development and operation of
event-based systems. The infrastructure, called JEDI (Java Event-based
Distributed Infrastructure), is based on Java, RMI, and standard
Internet technology, and supports the creation and operation of
distributed and cooperating active components. During the past year,
JEDI has been used to implement a significant example of distributed
system, namely, the OPSS workflow management system.
The presentation illustrates JEDI main features and how we have used it
to implement the OPSS workflow management system. Moreover, it provides
an initial evaluation of our experiences in using an event-based
architectural style.
Finally, it indicates our research agenda and ongoing activities.
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