Supporting Reliable Transactional Business Processes by Publish/Subscribe Techniques
||Supporting Reliable Transactional Business Processes by Publish/Subscribe Techniques
||C. Schuler, H. Schuldt, H.-J. Schek
||Proceedings of the TES'01 Workshop on Technologies for E-ServicesRoma, Italy
||Institute of Information Systems, ETH Zurich
Processes have increasingly become an important
design principle for complex intra- and inter-organizational
e-services. In particular, processes allow to provide
value-added services by seamlessly combining existing
e-services into a coherent whole, even across corporate
boundaries. Process management approaches support the
definition and the execution of predefined processes as
distributed applications. They ensure that execution guarantees
are observed even in the presence of failures and concurrency.
The implementation of a process management execution
environment is a challenging task in several aspects. First,
the processes to be executed are not necessarily static and
follow a predefined pattern but must be generated dynamically
(e.g., choosing the best offer in a pre-sales interaction).
Second, deferring the execution of some application services in
case of overload or unavailability is often not acceptable and
must be avoided by exploiting replicated services or even by
automatically adding such services, and by monitoring and
balancing the load. Third, in order to avoid a bottleneck at
the process coordinator level, a centralized implementation
must be avoided as much as possible. Hence, a framework is
needed which supports both the modularization of the process
coordinator's functionality and the flexibility needed for
dynamically generating and adopting processes. In this paper we
show how publish/subscribe techniques can be used for the
implementation of process management. We show how the overall
architecture looks like when using a computer cluster and
publish/subscribe components as the basic infrastructure to
drive the enactment of processes. In particular we describe how
load balancing, process navigation, failure handling, and
process monitoring is supported with minimal intervention of a
You can directly download a PDF (669 KB) version of this paper.
!!! Dieses Dokument stammt aus dem ETH Web-Archiv
und wird nicht mehr gepflegt !!!
!!! This document is stored in the ETH Web archive
and is no longer maintained !!!