/// <summary>
/// Exports a streamable as an observable of change list events. Produces events that represent either insertions or deletions.
/// </summary>
/// <typeparam name="TPayload">The type of object being streamed</typeparam>
/// <param name="stream">An IStreamable object that is intended to be an output to the query.</param>
/// <returns>An IObservable object of events for output data from the query.</returns>
public static IObservable <TPayload> ToAtemporalObservable <TPayload>(
this IStreamable <Empty, TPayload> stream)
{
Invariant.IsNotNull(stream, nameof(stream));
return(stream.ToAtemporalObservable(null, Guid.NewGuid().ToString()));
}
/// <summary>
/// Registers an IStreamable object as an output of a query, with output as a list of change events.
/// </summary>
/// <typeparam name="TPayload">The type of object being streamed</typeparam>
/// <param name="container">The query container to which an egress point is being added.</param>
/// <param name="identifier">A string that can uniquely identify the point of egress in the query.</param>
/// <param name="stream">An IStreamable object that is intended to be an output to the query.</param>
/// <returns>An IObservable object of events for output data from the query.</returns>
public static IObservable <TPayload> RegisterAtemporalOutput <TPayload>(
this QueryContainer container,
IStreamable <Empty, TPayload> stream,
string identifier = null)
{
Invariant.IsNotNull(stream, nameof(stream));
return(stream.ToAtemporalObservable(container, identifier ?? Guid.NewGuid().ToString()));
}
/// <summary>
/// Convert a stream (with a Empty key) to a simple enumerable of the payloads.
/// </summary>
/// <typeparam name="TPayload"></typeparam>
/// <param name="source"></param>
/// <returns></returns>
public static IEnumerable <TPayload> ToPayloadEnumerable <TPayload>(this IStreamable <Empty, TPayload> source)
{
return(source.ToAtemporalObservable().ToEnumerable());
}