/// <summary>
/// Query all <see cref="T:Akka.Persistence.PersistentActor" /> identifiers, i.e. as defined by the
/// `persistenceId` of the <see cref="T:Akka.Persistence.PersistentActor" />.
///
/// The stream is not completed when it reaches the end of the currently used `persistenceIds`,
/// but it continues to push new `persistenceIds` when new persistent actors are created.
/// Corresponding query that is completed when it reaches the end of the currently
/// used `persistenceIds` is provided by <see cref="M:Akka.Persistence.Query.ICurrentPersistenceIdsQuery.CurrentPersistenceIds" />.
///
/// *Please note*, to use this feature, you need to enable `$streams` built-in projection in EventStore server. Please refer to
/// EventStore server documentation to find out how.
/// </summary>
public Source <string, NotUsed> PersistenceIds()
{
var publisherProps = AllPersistenceIdsPublisher.Props(true, _writeJournalPluginId);
return(Source
.ActorPublisher <string>(publisherProps)
.MapMaterializedValue(_ => NotUsed.Instance)
.Named("AllPersistenceIds"));
}
/// <summary>
/// Same type of query as <see cref="PersistenceIds"/> but the stream
/// is completed immediately when it reaches the end of the "result set". Persistent
/// actors that are created after the query is completed are not included in the stream.
/// </summary>
public Source <string, NotUsed> CurrentPersistenceIds() =>
Source.ActorPublisher <string>(AllPersistenceIdsPublisher.Props(false, _writeJournalPluginId))
.MapMaterializedValue(_ => NotUsed.Instance)
.Named("CurrentPersistenceIds") as Source <string, NotUsed>;
