SCENE: A Service Composition Execution Environment Supporting Dynamic Changes Disciplined Through Rules

Abstract

Service compositions are created by exploiting existing component services that are, in general, out of the control of the composition developer. The challenge nowadays is to make such compositions able to dynamically reconfigure themselves in order to address the cases when the component services do not behave as expected and when the execution context changes. We argue that the problem has to be tackled at two levels: on the one side, the runtime platform should be flexible enough to support the selection of alternative services, the negotiation of their service level agreements, and the partial replanning of a composition. On the other side, the language used to develop the composition should support the designer in defining the constraints and conditions that regulate selection, negotiation, and replanning actions at runtime. In this paper we present the SCENE platform that partially addresses the above issues by offering a language for composition design that extends the standard BPEL language with rules used to guide the execution of binding and re-binding self-reconfiguration operations.

Adaptive composition in dynamic service environments

“…In this regard, a number of approaches are concerned with incorporating exception handling mechanisms into the composition modeling language itself [17,18], allowing the designer (or user) to control recovery actions at execution time. Although effective for specific exception types (e.g.…”

Dynamic adaptation of service compositions with variability models

“…The first group supports dynamic adaptation at the language level (Colombo et al, 2006, Koning et al, 2009, Baresi and Guinea, 2011, Narendra et al, 2007, Sonntag and Karastoyanova, 2011, Moser et al, 2008. This approach can hinder reasoning about adaptations with complex and error-prone scripts ).…”

“…For example, SCENE (Colombo et al, 2006) extends WS-BPEL with Event Condition Action (ECA) rules that define consequences for conditions to guide the execution of binding and rebinding self-reconfiguration operations. VxBPEL (Koning et al, 2009) is an adaptation of WS-BPEL that allows variation points, variants, and configurations to be defined for a process in a service-centric system.…”

Multi-layered Monitoring and Adaptation

“…It also provides a dynamic adaptation and message mediation service for partnerlinks, using XSLT or regular expressions to transform messages accordingly. Colombo et al [3] extend the BPEL composition language with policy (re)binding rules written in the Drools language. These rules take the form of if-then-else statements, allowing service bindings to depend on process data collected at run time.…”