OSGi and Apache Felix 3.0: Beginner's Guide by Walid Joseph Gedeon

By Walid Joseph Gedeon

Construct a very operational real-life software composed of a number of bundles and an internet entrance finish utilizing Felix. Get your self accustomed to the OSGi ideas, in an easy-to-follow innovative demeanour. examine every little thing wanted concerning the Felix Framework and get accustomed to Gogo, its command-line shell to begin constructing your OSGi functions. Simplify your OSGi improvement adventure by means of studying approximately Felix iPOJO. A relentlessly sensible beginner's advisor that would stroll you thru making real-life OSGi purposes whereas displaying you the advance instruments (Maven, Eclipse, etc) that might make the adventure extra relaxing.

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Properties of the installed distribution. The active start level For example, in the following diagram, we have a Felix instance with an additional three bundles installed (bundles A, B, and C). In this example, the installed bundles are given start level 2 and Bundle C is not started. info Chapter 1 This diagram does not contain all the bundles that will be used for this case study: some of them have been hidden to reduce clutter. The start levels that we'll use to organize the bundles in our study are as follows:      Common Services (level 1), to which are assigned validated common services and libraries, in addition to the bundles provided as part of the distribution.

A. I implement registration code in the main() method b. I provide properties in the bundle manifest c. info Quick Intro to Felix and OSGi 3 What happens if, the active start level being at 4, you set it to 3? a. All the bundles in level 3 are started b. All the bundles in level 4 are stopped c. All the bundles are stopped and those on level 3 are started. Summary In this chapter, we have taken a beginner's overview of the OSGi world, skimmed through some background and history. We have also covered the OSGi Service Platform, its functional layout, the framework's modular entities, and the structure of bundles and their life-cycle on the framework.

Let's quickly go through the contents of this distribution and get acquainted with its directory structure. jar). This is actually the org. jar for convenience. We will be starting the framework through this JAR.  bundle: The auto-deploy directory; bundles in this directory are automatically installed and started at framework startup.  conf: Contains the configuration files. The default configuration is very suitable for most beginners. As you start looking for more ways to customize your Felix installation, you may come back to the files in this directory for a fine-tuning of the configuration.

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