SDN Controller Programming Guide

10
3 Developing Applications
Introduction
Figure 8 illustrates the various classes of software modules categorized by the nature of their
responsibilities and capabilities and the categories of the software layers to which they belong.
Also shown are the permitted dependencies among the classes of such modules. Note the explicit
separation of the implementations from interfaces (APIs). This separation principle is strictly
enforced in order to maintain modularity and elasticity of the application. Also note that these
represent categories, not necessarily the actual modules or components. This diagram only aims to
highlight the classes of software modules.
Figure 8 HP Application Modules