By Paul Bakker
Throughout the process this publication, you’ll discover ways to increase sleek net functions with instruments and strategies reminiscent of RESTful net prone, NoSQL, provisioning, elasticity, car Scaling, hotfixes, and automated failover. Code samples can be found from GitHub.
Work with dynamic OSGi prone to create modular applications
Explore the fundamentals of OSGi bundles and modular software design
Learn complicated themes, together with semantic versioning, integration checking 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 suffering from modular design
Get a glance at numerous recommendations for developing internet functions with a modular approach
Interact with chronic garage providers, together with relational databases and NoSQL
Examine possible choices for deploying modular functions to the cloud
Read or Download Building Modular Cloud Apps with OSGi PDF
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Extra resources for Building Modular Cloud Apps with OSGi
We will describe the most important headers in the manifest here, but remember that you will normally not write this by hand. Bundle-SymbolicName This is the formal name of the bundle. It may not contain spaces. jetty Bundle-Name The Bundle-Name is a user friendly name. You will see this name, for example, when you list bundles in an OSGi console (depending on what console you use). This name may contain spaces. The Bundle-SymbolicName and Bundle-Name are technically un‐ related. When no Bundle-Name is specified, most consoles and other tools will fall back to the Bundle-SymbolicName.
This way we have a mechanism of “graceful deg‐ radation” in place that enables hot system updates. We are going to see examples of all approaches in the remainder of this book. Developers coming from Java EE often wonder why you would want dynamic services in the first place. Service dynamics add some complexity because you always have to be aware of the fact that services can become unavailable. The reason dynamic services are worth the extra complexity is that they give very powerful deployment and update pos‐ sibilities.
Bundle-Version The Bundle-Version is the version of the bundle itself. The first thing to remember is that this version is not used for importing/exporting classes and interfaces. Importing and exporting is done using the Import-Package and Export-Package headers instead. This makes the Bundle-Version technically not that interesting, but it is still important while releasing bundles and communicating version numbers to users. micro 18 | Chapter 2: Basic Concepts of OSGi Major, minor, and micro are numeric values.
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