Componentizing Applications with Layered Architecture

A component is a reusable software entity that is developed and deployed independently. Component based software development has many architectural advantages. In the previous article Componentizing a Monolithic Application in Java, we learnt the need for componentizing applications for getting the benefits of reusability and modularity. In this article let us look at how multi layered application can be componentized. We take the example of a multi-layered POS (Point-Of-Sale) application and understand how the application can be componentized at various layers like presentation, business and persistence layers. Consider a Point-of-Sale (POS) application meant for tracking orders and payments in a restaurant. The POS is used to track the tables being occupied by the guests, orders being made from various tables, and to print bills. Apart from these operational features, the POS application can also be used for restaurant administration. Total number of tables in the restaurant, list of foods sold in the restaurant, their prices, and the associated tax rates can be managed.

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