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W. Hummer, B. Satzger, Ph. Leitner, S. Dustdar:
"Distributed Continuous Data Aggregation Over Web Service Event Streams";
Report No. TUV-1841-2011-4, 2011; 9 pages.

We present a distributed platform for continuous
event-based aggregation of Web services and data. The platform
both actively monitors Web services and receives XML events
using WS-Eventing. An aggregation is composed of multiple
inputs such as Web service invocations and event subscriptions,
which are formulated and processed in a query language based
on XQuery. Our query model allows to specify data dependencies
among the inputs of an aggregation. We use an XQuery language
extension that enables users to easily express which data are
exchanged between the individual inputs. The dependencies
are automatically resolved and continuously updated with the
required data at execution time. The query specification is
abstracted from its physical distribution, and the platform is able
to distribute the execution among multiple computing nodes. We
evaluate several aspects of the implemented prototype in a Cloud
Computing setting.

WS-Aggregation, Complex Event Processing, Data Aggregation, Continuous Query, Event-Based System