By Paul Bakker
In case you are an skilled Java developer within the company, this useful, hands-on e-book exhibits you the way to exploit OSGi to layout, enhance, and install modular cloud functions. you will fast easy methods to use OSGi, via concise code examples and a collection of most sensible practices derived from the authors' stories with real-world tasks. throughout the process this publication, you are going to discover ways to improve glossy net purposes with instruments and methods resembling RESTful net prone, NoSQL, provisioning, elasticity, automobile Scaling, hotfixes, and automated failover.
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Extra resources for Building Modular Cloud Apps with OSGi: Practical Modularity with Java in the Cloud Age
The OSGi speci‐ fication only provides a low-level API for services. Registering and looking up services is relatively complex using this low-level API, especially concerning service dynamics and thread safety (more about that later). Not to worry, however, unless you are writing low-level libraries, you are not supposed to use these low-level APIs! Instead, you should use one of the available dependency injection frameworks, such as Apache Felix De‐ pendency Manager or Declarative Services, to do the hard work for you.
When the other service is unregistered, and therefore becomes unavailable, the service with the now unavailable dependency can automatically be deregistered as well. Of course this degrades the ap‐ plication’s functionality, but this might be perfectly fine during maintenance windows. 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.
A new OSGi enterprise specification, RFC-195 Service Scopes, is in development and adds a “prototype” scope to services. With prototype services, a new service instance can be created for each client of the service. This would open the doors for more ad‐ vanced scoping mechanisms as well. It’s too early to dive into Service Scopes now, but it could be an interesting addition. Understanding Service Dynamics OSGi services are dynamic; they can be registered and deregistered at runtime. What does that mean exactly, and when would that happen?