cern.streaming.pool.core.service.impl

Class TrackKeepingDiscoveryService

java.lang.Object

cern.streaming.pool.core.service.impl.TrackKeepingDiscoveryService

All Implemented Interfaces:

DiscoveryService

public class TrackKeepingDiscoveryService
extends java.lang.Object
implements DiscoveryService

Special implementation of a DiscoveryService. It is able to discover streams recursively while preventing cycles. Also, it is able to detect recursive discoveries from multiple threads, which is not allowed.

Constructor Summary

Constructors

Constructor and Description
TrackKeepingDiscoveryService(java.util.List<StreamFactory> factories, PoolContent content)
TrackKeepingDiscoveryService(java.util.List<StreamFactory> factories, PoolContent content, java.util.Set<StreamId<?>> idsOfStreamsUnderCreation, java.lang.Thread contextOfExecution)

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.

Methods inherited from class java.lang.Object

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

Constructor Detail

TrackKeepingDiscoveryService

public TrackKeepingDiscoveryService(java.util.List<StreamFactory> factories,
                                    PoolContent content)

TrackKeepingDiscoveryService

public TrackKeepingDiscoveryService(java.util.List<StreamFactory> factories,
                                    PoolContent content,
                                    java.util.Set<StreamId<?>> idsOfStreamsUnderCreation,
                                    java.lang.Thread contextOfExecution)

Method Detail

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