Modular web service design for agility and maintainability with unity container

A key design consideration in software development is that models must be strongly cohesive yet be loose coupled to ensure reusability and maintainability for future deployments. Practice experiences can show how repeatable design concepts are represented and how new service offerings are developed within service-oriented architectures in a flexible manner. A web service architecture configuration (applied by an Australia-NZ car rental car company using distributed database architecture) is described in this paper. We demonstrate how flexibility can be incorporated in the design when new run-time dependencies are injected with version updates. The paper demonstrates the application of two object oriented principles — Inversion of Control and Dependency Injection — with the Microsoft .Net Unity Container libraries. The Unity Container pattern brings agility and ease in testability with a loosely coupled modular design. The paper contributes to design areas of service modularization and shares insights on how practitioners customize service architectures with new service dependencies.