Towards Self-adaptation for Dependable Service-Oriented Systems

Abstract

Abstract. Increasingly complex information systems operating in dynamic environments ask for management policies able to deal intelligently and autonomously with problems and tasks. An attempt to deal with these aspects can be found in the Service-Oriented Architecture (SOA) paradigm that foresees the creation of business applications from independently developed services, where services and applications build up complex dependencies. Therefore the dependability of SOA systems strongly depends on their ability to self-manage and adapt themselves to cope with changes in the operating conditions and to meet the required dependability with a minimum of resources. In this paper we propose a model-based approach to the realization of self-adaptable SOA systems, aimed at the fulfillment of dependability requirements. Specifically, we provide a methodology driving the system adaptation and we discuss the architectural issues related to its implementation. To bring this approach to fruition, we developed a prototype tool and we show the results that can be achieved with a simple example.

RPC automation: Making legacy code relevant

“…Adding self-adaptive deployment and configuration models of SOA systems addresses the challenges of networked distributed systems [24]. Similarly Cardinelli proposes selfadaptive models to dynamically react to environment changes to increase a system's dependability [8].…”

Fault masking as a service

“…There exist service brokers and architectural frameworks that are responsible for the creation/composition as well as the adaptation of a CS. As an advantage of this approach, structural changes (i.e., architecture selection) can also be applied to the CS . However, such approaches are inherently coupled with the adapted CS based on a CS model.…”

“…Research efforts so far have mainly focused on providing service brokers , middleware, and framework support to compose dependable services. In our previous work , we proposed the implementation of forecasting, detection, and handling of external faults as external services.…”

Towards Pattern-Based Reliability Certification of Services

“…Cardellini et al [6] proposed a model-based approach to the realization of self-adaptable SOA systems with the goal of addressing dependability requirements. The authors introduced a SLA (System Level Agreement) Monitor for monitoring aspects of the services agreed in SLA.…”