By Paul Bakker
Throughout the process this booklet, you’ll learn how to enhance sleek net functions with instruments and methods resembling RESTful internet companies, NoSQL, provisioning, elasticity, automobile 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 subject matters, together with semantic versioning, integration checking out, and configuring components
Understand OSGi pitfalls, anti-patterns, and contours you want to avoid
Create a modular structure for cloud-based net applications
Discover how maintainability, extensibility, scalability, and testability are suffering from modular design
Get a glance at quite a few strategies for growing internet functions with a modular approach
Interact with continual garage companies, together with relational databases and NoSQL
Examine choices for deploying modular functions to the cloud
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Extra info for Building Modular Cloud Apps with OSGi
This is obviously only possible when the exporting package specifies a version. 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.
Remember that services can come and go at any time. This is nontrivial and a lot of work. With a dependency injection framework, it’s very easy, however, as the framework will take care of the dynamics. To do so, we have to register the component and declare a dependency on the Agenda service. We will do so in a new Activator class. However, our shell command doesn’t have a Java interface. class. This is to say that our component has the lifecycle of a service, but is not meant to be used from other Java classes.
Service Dynamics | 17 This is a very powerful deployment mechanism that changes the way to deal with soft‐ ware updates completely. Besides updates, dynamic services also come in to play when configuration of a system is changed, for example; the system can dynamically recon‐ figure itself without taking it down. The Bundle Format A bundle is the deployment unit in OSGi. Basically, a bundle is just a JAR file with a bundle manifest. MF. We will describe the most important headers in the manifest here, but remember that you will normally not write this by hand.