By Richard S. Hall, Karl Pauls, Stuart McCulloch, David Savage

OSGi is a Java-based framework for growing purposes as a suite of interconnected modules. OSGi enables you to set up, commence, cease, replace, or uninstall modules at execution time with no taking down all of your procedure. it is the spine of the Eclipse plugin approach, in addition to many Java EE bins, akin to GlassFish, Geronimo, and WebSphere. OSGi in motion presents a transparent creation to OSGi ideas with examples which are appropriate either for architects and builders. you will commence with the significant rules of OSGi: bundles, module lifecycles, and interplay between software elements. With the middle ideas good in hand, you will discover various software situations and strategies. you are going to tips on how to migrate legacy structures to OSGi and the way to check, debug, and deal with purposes.

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A ShapeComponent is associated with a specific SimpleShape implementation by name, which it retrieves from a reference to its PaintFrame. 4 highlights some of the UI elements in the paint program GUI. info 34 CHAPTER 2 Mastering modularity (public, private, protected, and package private) with module private visibility (only visible in the module). NET, this is similar to the internal access modifier, which marks something as being visible in an assembly but private from other assemblies. As you can see, the bundle concept plays important roles in both physical and logical modularity.

The goal was twofold: to create a bridge between the two communities and to ensure OSGi technology integration was considered by JSR 277. 1 specification release. During this period, OSGi technology continued to gain momentum. JSR 277 continued to make slow progress through 2008 until it was put on hold indefinitely. 8 JSR 294 During this time in 2006, JSR 294 (titled “Improved Modularity Support in the Java Programming Language”) was introduced as an offshoot of JSR 277. Its goal was to focus on necessary language changes for modularity.

Following good design principles, OSGi promotes an interface-based programming approach to separate interfaces from implementations. With this high-level understanding of Java’s limitations and OSGi’s capabilities, we can start our adventure by diving into the details of the module layer in chapter 2. This is the foundation of everything else in the OSGi world. info Mastering modularity This chapter covers ■ Understanding modularity and why it’s desirable ■ Using metadata to describe OSGi bundles (aka modules) ■ Explaining how bundle metadata is used to manage code visibility ■ Illustrating how bundles are used to create an application In the previous chapter, we took a whistle-stop tour of the OSGi landscape.

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