cern.streaming.pool.core.service.impl

Class LocalPool

java.lang.Object

cern.streaming.pool.core.service.impl.LocalPool

All Implemented Interfaces:

DiscoveryService, ProvidingService

public class LocalPool
extends java.lang.Object
implements DiscoveryService, ProvidingService

Local pool for providing and discovery of Publishers. (this class is both a DiscoveryService and a ProvidingService). The most important feature of the LocalPool is that it supports the lazy creation of the streams, specifically, they are created when discovered using StreamFactorys. When a StreamId is discovered, the discovery is delegated to a new instance of TrackKeepingDiscoveryService. The TrackKeepingDiscoveryService then tries to create the stream using the provided TypedStreamFactorys if no matching StreamId has already been provided.

Constructor Summary

Constructors

Constructor and Description
LocalPool()
LocalPool(java.util.List<StreamFactory> factories)

Method Summary

Modifier and Type	Method and Description
<T> org.reactivestreams.Publisher<T>	discover(StreamId<T> id) Given a StreamId, this method returns the correspondent Publisher.
<T> void	provide(StreamId<T> id, org.reactivestreams.Publisher<T> obs) Provides the stream with the specified id.

Methods inherited from class java.lang.Object

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

Constructor Detail

LocalPool

public LocalPool()

LocalPool

public LocalPool(java.util.List<StreamFactory> factories)

Method Detail

provide

public <T> void provide(StreamId<T> id,
                        org.reactivestreams.Publisher<T> obs)

Description copied from interface: ProvidingService

Provides the stream with the specified id. From the moment the stream is provided, it can be accessed from DiscoveryService using the same StreamId.

Specified by:

provide in interface ProvidingService

Parameters:

id - the StreamId that identifies the specified stream

obs - the Publisher to be provided

discover

public <T> org.reactivestreams.Publisher<T> discover(StreamId<T> id)

Description copied from interface: DiscoveryService

Given a StreamId, this method returns the correspondent Publisher. This method should not return null, instead is preferred to throw a specific exception in the case the given id is not present in the system. From the API level, this behavior is not forced.

Specified by:

discover in interface DiscoveryService

Parameters:

id - the identifier of the stream to be discovered

Returns:

the discovered Publisher