OSGi CDI Integration Specification -- Raymond Augé, Liferay

OSGi CDI Integration Specification
Raymond Augé - Sr. So ware Architect
@rotty3000

Why CDI In OSGi?
Important Java specification
Reduce developer friction
Benefit from extensive feature set
@rotty3000

CDI - Features
as part of its feature set, is...
extensible (CDI has a full fledged SPI)
annotation processing engine
intra-bundle dependency injection
Custom annotations!
@rotty3000

CDI - Internal wiring: @Inject
@rotty3000
import javax.inject.Inject;
public class PresenterImpl implements Presenter {
private final Laptop laptop;
@Inject
public PresenterImpl(Laptop laptop) {
this.laptop = laptop;
}
}
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CDI - Internal wiring: @Produces
@rotty3000
import javax.enterprise.inject.Produces;
@Produces Presentation presentation(
LocalDate date, Presenter presenter, @Topic String
topic,
Details details) {
return new Presentation.Builder(date)
.withPresenter(presenter)
.withTopic(topic)
.withDetails(details)
.build();
}
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OSGi-CDI - Services: singleton
@rotty3000
import org.osgi.service.cdi.annotations.Service;
@Service
public class PresenterImpl implements Presenter {
...
}
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OSGi-CDI - Services: prototype
@rotty3000
import org.osgi.service.cdi.annotations.Service;
import org.osgi.service.cdi.annotations.ServiceInstance;
@Service @ServiceInstance(PROTOTYPE)
public class Beer implements Drink {
...
}
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OSGi-CDI - References to OSGi Services
@rotty3000
import org.osgi.service.cdi.annotations.Reference;
@Inject @Reference
Presenter presenter;
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OSGi-CDI - References Cardinality: mandatory
@rotty3000
@Inject @Reference
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OSGi-CDI - References Cardinality: optional
@rotty3000
@Inject @Reference
Optional<Drink> drink;
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OSGi-CDI - References Cardinality: multiple
... implies 0..n (multiple optional)
@rotty3000
@Inject @Reference
List<Drink> drink;
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OSGi-CDI - References Cardinality: at least one
(or n)
@rotty3000
import org.osgi.service.cdi.annotations.MinimumCardinality;
@Inject @Reference @MinimumCardinality(1)
List<Drink> drink;
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OSGi-CDI - Reference Policy: reluctant
... reference is Greedy by default
@rotty3000
import org.osgi.service.cdi.annotations.Reluctant;
@Inject @Reference @Reluctant
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OSGi-CDI - References Dynamic: mandatory
@rotty3000
@Inject @Reference
Provider<Presenter> presenter;
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OSGi-CDI - References Dynamic: multiple
@rotty3000
@Inject @Reference
Provider<List<Presenter>> presenters;
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OSGi-CDI - References Dynamic: optional
@rotty3000
@Inject @Reference
Provider<Optional<Presenter>> presenter;
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OSGi-CDI - Reference: target
@rotty3000
@Inject @Reference(target = "(service.vendor=Chicago JUG)")
List<Presenter> presenters;
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OSGi-CDI - Reference: target
@BeanPropertyType
@rotty3000
import org.osgi.service.cdi.propertytypes.ServiceVendor;
@Inject @Reference @ServiceVendor("Chicago JUG")
List<Presenter> presenters;
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OSGi-CDI - Reference: prototype required
@rotty3000
import org.osgi.service.cdi.annotations.MinimumCardinality;
import org.osgi.service.cdi.annotations.PrototypeRequired;
@Inject @Reference @MinimumCardinality(1)
@PrototypeRequired
List<Entry<Map<String, Object>, Drink>> drinks;
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OSGi-CDI - Reference: any type
... in support of whiteboards
@rotty3000
import org.osgi.service.cdi.propertytypes.ServiceVendor;
@Inject @Reference(service = Reference.Any.class)
@ServiceVendor("Chicago JUG")
List<Object> all;
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OSGi-CDI - Reference: service events
@rotty3000
@Inject @ServiceVendor("Chicago JUG")
void monitorDrinks(BindServiceReference<Drink> drinks) {
drinks
.adding(this::doAdd)
.modified(this::doModified)
.removed(this::doRemoved)
.bind();
}
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OSGi-CDI - OSGi Logger
@rotty3000
import org.osgi.service.log.Logger;
@Inject
Logger video;
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OSGi-CDI - Configuration
@rotty3000
import
org.osgi.service.cdi.annotations.ComponentProperties;
@Inject @ComponentProperties
Map<String, Object> eventDetails;
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OSGi-CDI - Configuration Types
@rotty3000
import org.osgi.service.cdi.annotations.BeanPropertyType;
@Retention(RUNTIME)
@BeanPropertyType
public @interface Details {
String address();
String instructions();
}
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OSGi-CDI - Configuration: typed
@rotty3000
import
org.osgi.service.cdi.annotations.ComponentProperties;
@Inject @ComponentProperties
Details eventDetails;
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OSGi-CDI - Single Component
@rotty3000
import org.osgi.service.cdi.annotations.PID;
import org.osgi.service.cdi.annotations.SingleComponent;
@SingleComponent
@PID(value = "details", policy = REQUIRED)
@Service
public PresenterImpl implements Presenter {
@Inject Laptop laptop;
@Inject @ComponentProperties Details eventDetails;
}
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OSGi-CDI - Factory Component
@rotty3000
import org.osgi.service.cdi.annotations.PID;
import org.osgi.service.cdi.annotations.FactoryComponent;
@FactoryComponent("registration")
@PID(value = "details", policy = REQUIRED)
public class AttendeeImpl implements Attendee {
@Inject @ComponentProperties Registration registration;
@Inject @ComponentProperties Details eventDetails;
}
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The OSGi-CDI Spec
https://osgi.org/specification/osgi.enterprise/7.0.0/service.cdi.html
@rotty3000

The OSGi-CDI Reference Implementation
https://github.com/apache/aries-cdi
@rotty3000

OSGi CDI Integration Specification -- Raymond Augé, Liferay

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