Building Modular Cloud Apps with OSGi by Paul Bakker

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By Paul Bakker

In the course of the process this e-book, you’ll learn how to boost glossy internet purposes with instruments and strategies resembling RESTful net prone, NoSQL, provisioning, elasticity, vehicle Scaling, hotfixes, and automated failover. Code samples can be found from GitHub.
Work with dynamic OSGi companies to create modular applications
Explore the fundamentals of OSGi bundles and modular software design
Learn complicated subject matters, together with semantic versioning, integration trying 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 innovations for developing internet functions with a modular approach
Interact with chronic garage prone, together with relational databases and NoSQL
Examine choices for deploying modular purposes to the cloud

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By default, we will have to handle NullPointerException situations ourselves in case our service de‐ pendencies are not available. This is very useful in some cases. println("Agenda not available"); } } Save your code change and run listConferences again in the console. It should now display Agenda not available. Our simple program now gracefully degrades when the agenda service is not available. In many other cases, there is nothing useful you can do when a service you depend on is unavailable, and it would be a lot of work to add extra null checks everywhere in the code.

This works fine, and many projects use this approach. The major downside is Maven itself. Maven is a decent build tool, but it does a very bad job at facilitating the development process. Fast development requires a fast turnaround of code changes, and this is very difficult to achieve with Maven. , there is actually no real reason to still use Maven. Eclipse Tycho Eclipse Tycho is another Eclipse plug-in that facilitates OSGi development. It is more tied toward Eclipse plug-in development and less fit for general OSGi development.

Only exported packages that are within the version range will be used by the resolver. micro. 2, but more often, a range of versions is specified. A version range can be used to be compatible with any version in the same major range, for example. Table 2-1 contains some examples of version ranges. Table 2-1. ” This is a set of rules that define what kinds of code changes should result in a major, minor, or micro version update. We will see a lot more about semantic versioning in “Semantic Versioning” on page 45.

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