cern.streaming.pool.core.service.streamfactory

Class CompositionStreamFactory

java.lang.Object

cern.streaming.pool.core.service.streamfactory.CompositionStreamFactory

All Implemented Interfaces:

StreamFactory

public final class CompositionStreamFactory
extends java.lang.Object
implements StreamFactory

EXPERIMENTAL StreamFactory which provides a flexible way to create ReactiveStreams based on composition of streams.

Constructor Summary

Constructors

Constructor and Description
CompositionStreamFactory()

Method Summary

Modifier and Type	Method and Description
<T> java.util.Optional<org.reactivestreams.Publisher<T>>	create(StreamId<T> id, DiscoveryService discoveryService) Given an implementation of StreamId and a DiscoveryService this method creates a ReactiveStream.

Methods inherited from class java.lang.Object

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

Constructor Detail

CompositionStreamFactory

public CompositionStreamFactory()

Method Detail

create

public <T> java.util.Optional<org.reactivestreams.Publisher<T>> create(StreamId<T> id,
                                                                       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:

id - 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