A Formal Model of QoS-Aware Web Service Orchestration Engine

TL;DR

This paper presents a formal actor-based model for QoS-aware web service orchestration, enabling systems to meet customer QoS requirements through structured layers of service, system, and behavior.

Contribution

It introduces a novel formal model of QoS-aware web service orchestration based on actor systems theory, with a layered structure capturing requirements, system characteristics, and behaviors.

Findings

Formal model based on actor systems theory.

Layered structure captures requirements, system, and behavior.

System with QoS-Aware WSO Behavior provides QoS-aware services.

Abstract

QoS-aware applications can satisfy not only the functional requirements of the customers, but also the QoS requirements. QoS-aware Web Service orchestration translates the QoS requirements of the customers into those of its component Web Services. In a system viewpoint, we discuss issues on QoS-aware Web Service orchestration and design a typical QoS-aware Web Service orchestration engine called QoS-WSOE. More importantly, we establish a formal model of QoS-WSOE based on actor systems theory. Within the formal model, we use a three-layered pyramidal structure to capture the requirements of the customers with a concept named QoS-Aware WSO Service, characteristics of QoS-WSOE with a concept named QoS-Aware WSO System, and structures and behaviors of QoS-WSOE with a concept named QoS-Aware WSO Behavior. Conclusions showing that a system with QoS-Aware WSO Behavior is a QoS-Aware WSO System and further can provide QoS-Aware WSO Service are drawn.