Autonomous Runtime QoS Control for Composite Services in SOA

Negotiating multiple SLAs in itself is not sufficient to guarantee end-to-end QoS levels as SLAs in practice often give probabilistic QoS guarantees and SLA violations can still occur. Moreover probabilistic QoS guarantees do not necessarily capture time-dependent behavior, (e.g., short term service degradations). Therefore, the negotiation of SLAs needs to be supplemented with run-time QoS-control capabilities that give providers of composite services the capability to properly respond to short-term QoS degradations (real-time composite service adaptation). Motivated by this we developed an approach that captures (temporarily) QoS degradations by tracking the behavior of third party services.