Introduction

Abstract

In the past years, the Web has evolved from an information sharing medium to a wide-scale environment for sharing capabilities or services. Currently, URLs not only point to documents and images, but are also used to invoke services that potentially change the state of the Web. The Web provides services for booking airline tickets, purchasing items, checking the weather, opening a bank account and many other activities. Web services also play a major role in the Internet of Things (IoT) vision where connectivity and interoperability of wearable devices and sensors is a main challenge. Web services and APIs are used by IoT systems to connect devices to the Internet; a process characterized by high level of data processing. Service-Oriented Architecture (SOA) is a key player in implementing these systems as it enables exposing applications as reusable, interoperable, network-accessible software modules commonly known as Web services.