Download Building Modular Cloud Apps with OSGi: Practical Modularity by Paul Bakker PDF

By Paul Bakker

ISBN-10: 1449345158

ISBN-13: 9781449345150

If you are an skilled Java developer within the company, this sensible, hands-on publication exhibits you ways to take advantage of OSGi to layout, increase, and install modular cloud purposes. you are going to quick the right way to use OSGi, via concise code examples and a suite of top practices derived from the authors' reports with real-world tasks. in the course of the process this e-book, you are going to learn how to strengthen sleek internet purposes with instruments and strategies akin to RESTful internet providers, NoSQL, provisioning, elasticity, automobile Scaling, hotfixes, and automated failover.

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Extra info for Building Modular Cloud Apps with OSGi: Practical Modularity with Java in the Cloud Age

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Instead, you should use a dependency injection framework to do so. There are several choices, such as Apache Felix Dependency Manager, Declarative Services, and BluePrint. These frameworks offer different ways to do roughly the same thing: publish services in the service registry and use services from the service registry. There are some differences, however, and choosing a framework is mostly dependent on preference for writing Java code, annotations, or XML. In the remainder of this book, we will use Apache Felix Dependency Manager.

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. Let’s say that the SimpleAgenda service is being updated. To update the bundle, the bundle has to be stopped, updated, and started again. What happens if some other service (like our command) tries to invoke the Agenda service while the bundle is stop‐ ped? simple bundle and then issuing the listConferences command.

Other parts of the application can continue to work as normal. In other cases, a service might continue to be available even when its dependencies are not available. A trivial example is a dependency on a log service. Even without logging, you can execute most code. Another solution might be to inform a user that specific functionality is currently unavailable. The last option is to dynamically switch to another implementation (or version) of the same service interface. This way we have a mechanism of “graceful deg‐ radation” in place that enables hot system updates.

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Building Modular Cloud Apps with OSGi: Practical Modularity with Java in the Cloud Age by Paul Bakker

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