DefinePK

Abstract

The study describes an application composition and execution
environment implemented as a workflow system that enables sets of inter-related
tasks to be carried out and supervised in a flexible manner. Concerning the
serious deficiency of flexibility in the current workflow systems, we describe
how our workflow system meets the requirements of interoperability, scalability,
flexibility, dependability and adaptability. With an additional route engine,
the execution path will be adjusted dynamically according to the execution conditions
so as to improve the flexibility and dependability of the system. A dynamic
register mechanism of domain engines is introduced to improve the scalability
and adaptability of the system. Finally we put emphasis on describing process
executing sequence of our system. The system is general purpose and open It
has been designed and implemented as a set of CORBA services. The system serves
as an example of the use of middleware technologies to provide a fault-tolerant
execution environment for long running distributed applications. The system
also provides a mechanism for communication of distributed components in order
to support inter-organizational WFMS.