By Richard Hall, Karl Pauls, Stuart McCulloch, David Savage
What is OSGi? easily positioned, OSGi is a standardized expertise that permits builders to create the hugely modular Java functions which are required for firm improvement. OSGi enables you to set up, commence, cease, replace, or uninstall parts with no taking down your whole procedure. The curiosity in OSGi established functions has exploded in view that significant owners like sunlight, Spring, Oracle, BEA, and IBM have got in the back of the standard.
OSGi in Action is a accomplished consultant to OSGi with basic ambitions. First, it offers 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 easiest practices for relocating legacy platforms to OSGi?
buy of the print publication comes with a suggestion of a loose PDF, ePub, and Kindle publication from Manning. additionally to be had is all code from the book.
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Extra resources for OSGi in Action: Creating Modular Applications in Java
Although no Java technology fills the exact same niche as OSGi, several tread similar ground, and it’s worth understanding their relevance before moving forward. 4 Putting OSGi in context OSGi is often mentioned in the same breath with many other technologies, but it’s in a fairly unique position in the Java world. Over the years, no single technology has addressed OSGi’s exact problem space, but there have been overlaps, complements, and offshoots. Although it isn’t possible to cover how OSGi relates to every conceivable technology, we’ll address some of the most relevant in roughly chronological order.
Because the two ignored each other for so long, there are some challenges in moving existing Java EE concepts to OSGi, largely due to different assumptions about how class loading is performed. Still, progress is being made, and today OSGi plays a role in all major application servers, such as IBM’s WebSphere, Red Hat’s JBoss, Oracle’s GlassFish, ObjectWeb’s JOnAS, and Apache’s Geronimo. Download from Wow! 2 Jini An often-overlooked Java technology is Jini, which is definitely a conceptual sibling of OSGi.
Logical modularity refers to this form of code visibility. Physical modularity refers to how code is packaged and/or made available for deployment. In OSGi, these two concepts are largely conflated; a logical module is referred to as a bundle, and so is the physical module (that is, the JAR file). Even though these two concepts are nearly synonymous in OSGi, for modularity in general they aren’t, because it’s possible to have logical modularity without physical modularity or to package multiple logical modules into a single physical module.