cern.streaming.pool.core.service.streamfactory

Class CreatorStreamFactory

java.lang.Object

cern.streaming.pool.core.service.streamfactory.CreatorStreamFactory

All Implemented Interfaces:

CreatorProvidingService, StreamFactory

public class CreatorStreamFactory
extends java.lang.Object
implements CreatorProvidingService, StreamFactory

TypedStreamFactory specifically designed to create ReactiveStreams using StreamCreators. In order to use the right StreamCreator for creating the ReactiveStream, it uses ImmutableIdentifiedStreamCreator to map a specific StreamId to the correspondent StreamCreator.

See Also:

StreamCreator, ImmutableIdentifiedStreamCreator

Constructor Summary

Constructors

Constructor and Description
CreatorStreamFactory(java.lang.Iterable<IdentifiedStreamCreator<?>> identifiedCreators)

Method Summary

Modifier and Type	Method and Description
<T> java.util.Optional<org.reactivestreams.Publisher<T>>	create(StreamId<T> newId, DiscoveryService discoveryService) Given an implementation of StreamId and a DiscoveryService this method creates a ReactiveStream.
<T> void	provide(StreamId<T> id, StreamCreator<T> streamSupplier) Provides a StreamCreator associated to the specified id.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

CreatorStreamFactory

public CreatorStreamFactory(java.lang.Iterable<IdentifiedStreamCreator<?>> identifiedCreators)

Method Detail

create

public <T> java.util.Optional<org.reactivestreams.Publisher<T>> create(StreamId<T> newId,
                                                                       DiscoveryService discoveryService)

Description copied from interface: StreamFactory

Given an implementation of StreamId and a DiscoveryService this method creates a ReactiveStream. The provided DiscoveryService can be used to discover other streams that are needed in the creation process (stream combination, transformation, etc.)

NOTE: it is strongly discouraged the use of multiple threads inside this method (see TypedStreamFactory documentation).

Specified by:

create in interface StreamFactory

Parameters:

newId - the id of the stream to create

discoveryService - DiscoveryService which can be used by the factory to look up other streams ('upstream' of the one it will create)

Returns:

the newly created stream or null if this factory cannot create the stream of the given id

provide

public <T> void provide(StreamId<T> id,
                        StreamCreator<T> streamSupplier)

Description copied from interface: CreatorProvidingService

Provides a StreamCreator associated to the specified id.

Specified by:

provide in interface CreatorProvidingService

Parameters:

id - the identifier of the stream that the StreamCreator will create

streamSupplier - the StreamCreator that is able to create the Flowable specified using the given id