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By Richard Hall, Karl Pauls, Stuart McCulloch, David Savage
What is OSGi? easily positioned, OSGi is a standardized know-how that enables builders to create the hugely modular Java functions which are required for firm improvement. OSGi permits you to set up, commence, cease, replace, or uninstall parts with out taking down all of your process. The curiosity in OSGi established functions has exploded in view that significant proprietors like sunlight, Spring, Oracle, BEA, and IBM have got at the back of the standard.
OSGi in Action is a complete advisor to OSGi with basic targets. First, it presents a transparent advent to OSGi ideas with examples which are suitable either for architects and builders. Then, it explores quite a few useful eventualities and strategies, answering questions like: How a lot of OSGi do you really need? How do you embed OSGi within different boxes? What are the simplest practices for relocating legacy platforms to OSGi?
buy of the print e-book comes with a suggestion of a loose PDF, ePub, and Kindle booklet from Manning. additionally on hand is all code from the book.
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Additional info for OSGi in Action: Creating Modular Applications in Java
Example text
Class to form a given application. Bundles are more powerful than standard JAR files, because you can explicitly declare which Class files contained packages are externally visible (that is, exported packages). jpg associated with the Java language. etc. mf imported packages). 5 A bundle contains code, resources, and metadata. ify their consistency automatically; this Download from Wow! com> An architectural overview of OSGi 11 process is called bundle resolution and involves matching exported packages to imported packages.
You’re correct. That’s what makes the OSGi’s service approach so natural if you’re already following an interface-based approach; your code will largely stay the same. Your development will be a little different in two places: how you make a service instance available to the rest of your application, and how the rest of your application discovers the available service. Download from Wow! ” examples All service implementations are ultimately packaged into a bundle, and that bundle must be lifecycle aware in order to register the service.
The goal of this chapter is to get you thinking in terms of modules rather than JAR files. We’ll teach you about OSGi module metadata, and you’ll learn how to describe your application’s modularity characteristics with it. To illustrate these concepts, we’ll continue the simple paint program example that we introduced in chapter 1; you’ll convert it from a monolithic application into a modular one. Let’s get started with modularity. 1 What is modularity? Modularity encompasses so many aspects of programming that we often take it for granted.