Ok, so by now you know quite a lot about OSGi and bundle development on Felix, and you are well on your way with the bookshelf project.
In this chapter, you have completed the business logic tier of the case study. You have:
BookshelfService
interfaceIn the next chapter, we'll look at the Felix Gogo Shell Service, and more specifically, at how to implement and register our own commands. This will be the first part of the presentation tier (Tier 1).