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A Middleware Layer for Flexible and Cost-Efficient Multi-tenant Applications

Abstract : Application-level multi-tenancy is an architectural design principle for Software-as-a-Service applications to enable the hosting of multiple customers (or tenants) by a single application instance. Despite the operational cost and maintenance benefits of application-level multi-tenancy, the current middleware component models for multi-tenant application design are inflexible with respect to providing different software variations to different customers.In this paper we show that this limitation can be solved by a multi-tenancy support layer that combines dependency injection with middleware support for tenant data isolation. Dependency injection enables injecting different software variations on a per tenant basis, while dedicated middleware support facilitates the separation of data and configuration metadata between tenants. We implemented a prototype on top of Google App Engine and we evaluated by means of a case study that the improved flexibility of our approach has little impact on operational costs and upfront application engineering costs.
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Stefan Walraven, Eddy Truyen, Wouter Joosen. A Middleware Layer for Flexible and Cost-Efficient Multi-tenant Applications. 12th International Middleware Conference (MIDDLEWARE), Dec 2011, Lisbon, Portugal. pp.370-389, ⟨10.1007/978-3-642-25821-3_19⟩. ⟨hal-01597768⟩

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