An Architectural Model for Customizing the Business Logic of SaaS Applications

Traditional software applications are typically customized before being delivered to a client. This customization was a paid service delivered by software development organisations. With the growing demand of applications delivered with a SaaS model, software development organisations are increasingly responding with the migration of traditional applications to a multi-tenant SaaS deployment model. This makes them face themselves with the problem of customizing a shared application, with a shared database, for each tenant that subscribes their deployed service. After overviewing existing solutions for application customizability, this paper addresses the customization of the business logic layer of multi-tenant applications by proposing a solution, which has been used in a multi-tenant WMS application deployed with a SaaS service model.