OSGi CDI Integration Specification - Ray Augé (Liferay)

Nov 16, 20180 likes395 views

OSGi Community Event 2018 Presentation by Ray Augé (Liferay) Abstract: This talk discusses the upcoming OSGi CDI Integration Specification and demonstrates common usage patterns and its component model that brings OSGi dynamics; like services and configuration, to CDI and provides for an ecosystem of CDI portable extentions.

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OSGI CDI Integration
Specification
Raymond Augé <raymond.auge@liferay.com>

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https://osgi.org/specification/osgi.enterprise
/7.0.0/service.cdi.html
Can I see the spec?

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https://github.com/apache/aries/tree/trunk/cdi
Can I see the RI?

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Business requirements contingent on CDI
Internal application model
Extensible feature set
Why CDI in OSGi?

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100x100 We 💖 DS!
99.9% of all Liferay bundles are DS and the
vast majority will remain DS forever.
But DS (Declarative Services)?

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DS by design is ultra light weight, and the DS
annotations are merely convenient CLASS
retention annotations processed at build time.
I.e. DS is not an annotation processor.
But DS …. 😿

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CDI, as part of its feature set, is an
extensible annotation processing engine.
Custom annotations!
CDI

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CDI, allows for completely internal, private
wiring.
CDI

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Internal wiring - @Inject

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Services: singleton

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Services: bundle

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Services: prototype

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References

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Cardinality: mandatory

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Cardinality: optional

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Cardinality: multiple

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Cardinality: at least one (or n)

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Reference Policy: reluctant
GREEDY by default

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Dynamic: mandatory

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Dynamic: optional

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Dynamic: multiple

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Components
@ApplicationScoped
@Service
class Controller {
@Inject @Reference
ConfigurationAdmin cm;
@Inject DRManager brm;
@Inject @Reference
Optional<Pojo> pojo;
}
class DRManager {
@Inject @Reference
Provider<List<DR>> foo;
}
class Web {
@Inject Controller ctlr;
}
@FactoryComponent
@Service
class DR {}
@SingleComponent
class Pojo {
@Inject @Reference
Other other;
}
Container Component
CDI Bundle

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OSGi Logger

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Configuration

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OSGi Community Event 2018 Presentation by Dirk Fauth (Bosch) Abstract: In todays connected world the requirement to connect applications across network boundaries has become a common requirement. With OSGi there are several ways to accomplish this, as there are different specifications to achieve this. In this talk we will look at some of these specifications to show what options there are and which might fit your requirements. Starting from an architecture that makes use of the HTTP Whiteboard pattern, over Remote Services to finally showing the usage of the JAX-RS Whiteboard specification introduced with R7. We will show the general usage of these specifications and explaining the advantages and disadvantages of each solution.

Visualization of OSGi based Software Architectures in Virtual Reality - Lisa ...mfrancis

OSGi Community Event 2018 Presentation by Lisa Nafeie (DLR) Abstract: Classic software architecture visualizations such as UML diagrams are widely used in practice but are not always the best solution, for example to get an high level overview of large component-based software systems. In this talk, we show other suitable technologies for software visualization to understand complex software architectures. Especially, we show how to visualize OSGi based software architectures in Virtual Reality (VR) using VR headsets. We address the question, how software visualizing can help during the development process and what are the resulting benefits for developers and software testers. We focus on four aspects: Development, evaluation, quality assurance, and visualization technology. We demonstrate software visualization using the software ”IslandViz”, which visualizes OSGi based software systems using an island metaphor, where islands on a virtual water level represents OSGi bundles, regions on the islands represents packages, and buildings represents classes. We describe how to get all relevant data for the visualization by repository mining on the whole source tree and data mining on source code level. We store all data in a graph database for further analysis and visualization. Through software visualization we were able to answer many important questions, which have already taken a lot of time in development and test-phases. In addition, it’s very important to make the software architecture tangible, which makes it easier way to talk about technical problems in teams formed by people with different knowledge, communications skills, and backgrounds.