RESTful web services composition & performance evaluation with different databases

Service composition is a popular mechanism to orchestrate different and distributed services to produce composite services. Composed services are typically businesscentric, and process-aware. There are a variety of use cases mandating such kinds of service compositions. With services emerging as the most appropriate building block and the unit of deployment, finding, composing, binding and leveraging services turns out to be an important job for software architects and developers. However, service composition is not an easy affair. There are several methods proposed by various researchers and scholars across the globe. Several parameters and considerations are being made in order to simplify and streamline service composition. Predominantly there are SOAP and RESTful services. There are markup languages to describe and define the distinct capabilities of participating services. In the recent past, a new architectural style (Microservices architecture (MSA)) is emerging and evolving fast. Microservices are lightweight, autonomous, self-defined, horizontally scalable, interoperable, and composable. In this paper, we have leveraged different databases for different services and evaluated the service performance individually and collectively. That is, multiple services are used and each service uses a database instance.