QoS–aware service composition and binding are among the most challenging and promising issues for service–oriented architectures.
The aim of QoS–aware service composition is to determine the set of services that, once composed, will perform the required
functionality, and will best contribute to achieve the level of QoS promised in Service Level Agreements (SLAs). While the
existing works focus on cross–domain QoS attributes, it would be useful to support service composition and binding according
to some characteristics on the borderline between functional and non–functional attributes, often specific to the service
domain.
The paper describes a QoS evaluator that, integrated with our previously developed binder, allows the use of application specific
QoS attributes for composite service binding and re–binding. The applicability of the proposed approach and tool is shown
through a case study related to the image processing domain.
Keywords Quality of Service - Dynamic binding - Re–binding - Composite Web Services