By Paul Bakker
In the course of the process this e-book, you’ll learn how to increase sleek internet functions with instruments and strategies akin to RESTful net providers, NoSQL, provisioning, elasticity, car Scaling, hotfixes, and automated failover. Code samples can be found from GitHub.
Work with dynamic OSGi providers to create modular applications
Explore the fundamentals of OSGi bundles and modular software design
Learn complicated themes, together with semantic versioning, integration trying out, and configuring components
Understand OSGi pitfalls, anti-patterns, and lines you might want to avoid
Create a modular structure for cloud-based net applications
Discover how maintainability, extensibility, scalability, and testability are laid low with modular design
Get a glance at a variety of innovations for growing net functions with a modular approach
Interact with power garage prone, together with relational databases and NoSQL
Examine choices for deploying modular functions to the cloud
Read Online or Download Building Modular Cloud Apps with OSGi PDF
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Extra info for Building Modular Cloud Apps with OSGi
0" 20 | Chapter 2: Basic Concepts of OSGi An Export-Package header can specify a uses constraint. This can be used to define transitive dependencies on other packages so that an importing bundle knows about the extra package requirements imposed by importing a specific package. api. api" Note that BND will automatically generate uses constraints. It will analyze all the code within the exported package, and generate uses constraints for all required import packages for that code. Bundle-Activator A Bundle-Activator is a class that implements the BundleActivator interface and will be instantiated and invoked by the OSGi framework when the bundle is started or stopped.
We are going to start by creating an API bundle. An API bundle contains exported/public classes and interfaces but should not contain imple‐ mentations. Start by creating a new bundle descriptor in the agenda project, and name it api. If Bndtools asks to enable sub-bundles, accept the default (yes) and click Finish. jar. Double-click to open the JAR File Viewer and inspect to see if it is really empty. The JAR File Viewer is a handy tool that might come of use later on. Agenda. The Conference class should have the following properties and getters/setters: String name; String location; Also, implement a no-argument constructor and a convenience constructor that accepts name and location as parameters.
What does that mean exactly, and when would that happen? In an OSGi environment, it is perfectly possible to update components or change configuration of a running 34 | Chapter 3: Creating the First OSGi Application application. We don’t have to take the application down to do the update; this can all be done without ever restarting. We could also start new services when new configuration is added (at runtime), for example. This gives a lot of flexibility when deploying an application, but your code needs to be able to handle this situation.
Building Modular Cloud Apps with OSGi by Paul Bakker