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Subrahmanya SV

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Top Stories by Subrahmanya SV

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. Point of Sale - An Example Application 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 bil... (more)

Component Models in Java | Part 1

A component is a reusable software entity. A component is a deployable piece of software that can be independently developed and maintained. In the previous article -Componentizing a Monolithic Application in Java, we discussed the need for componentizing applications to get the benefits of reusability and modularity. We also looked at how an E-Store application can be componentized using a simple component model developed by the authors using a factory whiteboard pattern and a simple repository. In Part 1 of this article we will try to understand various component models in Jav... (more)

Component Development and Assembly Using OSGi Services

This article introduces the concepts of Component Oriented Development and Assembly (CODA) using the OSGi Service platform with an example application. The article starts with an introduction to software components, elaborates with an example application, followed by an overview of the OSGi Service platform, and an implementation of the example application using this platform. Introduction to Software Components Components are parts that can be assembled to form a larger system. Electronic components such as ICs (Integrated Circuits) are assembled together to build an electronic... (more)

Componentizing a Monolithic Application in Java

Component-oriented development has many architectural advantages. In spite of this, many developers tend to solve problems the monolithic way on the first go. This article demonstrates how a monolithic design can be modified to achieve component-based design. During this conversion process, the necessity of Component Models and Frameworks are highlighted. The article demonstrates the componentization of an example monolithic application using a simple homegrown component model and framework developed by the authors. Introducing E-Store - A Business Application Let us assume that w... (more)

Part 3 | Component Models in Java

Service Component Architecture (shortly referred as SCA) is a technology for creating services from components. SCA is a set of OASIS standards and part of it is developed with the collaboration of vendors from open source community, referred as "OSOA" Open SOA. SCA helps to build systems as a collection of interconnected components. The components created in SCA communicate through the services. The advantage of SCA is its neutral component model. It allows services to be built by any language component like Java, C++, BPEL, JavaScript, Ruby, Python etc. SCA addresses two impo... (more)