Get Building Modular Cloud Apps with OSGi PDF

By Paul Bakker

ISBN-10: 1449345158

ISBN-13: 9781449345150

During the process this publication, you’ll discover ways to enhance glossy internet purposes with instruments and strategies reminiscent of RESTful net companies, 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 complex issues, together with semantic versioning, integration checking out, and configuring components
Understand OSGi pitfalls, anti-patterns, and contours you have to avoid
Create a modular structure for cloud-based internet applications
Discover how maintainability, extensibility, scalability, and testability are suffering from modular design
Get a glance at numerous thoughts for growing internet functions with a modular approach
Interact with chronic garage providers, together with relational databases and NoSQL
Examine possible choices for deploying modular purposes to the cloud

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Additional info for Building Modular Cloud Apps with OSGi

Sample text

Bndtools assumes a workspace is created for a set of related bun‐ dles. If you are building an application, it should have it’s own workspace. You shouldn’t put projects from different applica‐ tions in the same workspace. The agenda project is almost a plain Java project. xml file. bnd file contains all the bundle configuration, the Ant file is for building the project on a build server. Bndtools uses bnd files to specify manifest information. While Bndtools generates most of the information or provides wizards to edit the values, you can always edit the bnd files yourself.

By developing it this way, you will get some hands-on experience with creating bundles, package imports, and exports; creating services; and running applications from Bndtools. Prerequisites Before you get started, make sure you have all prerequisites installed: • A Java Development Kit (JDK 7 or higher). • Eclipse, with the Bndtools plug-in installed. x. Bndtools can be installed from the Eclipse Marketplace. 25 Figure 3-1. Overview of the agenda application Getting Started After installing and starting Eclipse, let’s start working on the example application by creating a new project using the Eclipse Bndtools plug-in.

Class))); public class OtherComponent { private volatile Greeter greeter; } When we install all three bundles, it will seem as if the framework will arbitrarily choose one of the implementations of Greeter to inject into OtherComponent. This is not very useful in most cases, but it is interesting what happens when the injected service becomes unavailable: the other service implementation will automatically be injected as a re‐ placement. , stop the providing bundle) and automatically fall back to another service.

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Building Modular Cloud Apps with OSGi by Paul Bakker

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