/// <summary>
/// Subscribes the specified aggregator to a catchup.
/// </summary>
/// <typeparam name="TProjection">The type of the projection.</typeparam>
/// <typeparam name="TData">The type of the stream's data.</typeparam>
/// <typeparam name="TCursor">The type of the cursor.</typeparam>
/// <param name="catchup">The catchup.</param>
/// <param name="aggregate">A delegate that performs an aggregate operation on projections receiving new data.</param>
/// <param name="projectionStore">The projection store.</param>
/// <returns>
/// A disposable that, when disposed, unsubscribes the aggregator.
/// </returns>
public static IDisposable Subscribe <TProjection, TData, TCursor>(
this IStreamCatchup <TData, TCursor> catchup,
AggregateAsync <TProjection, TData> aggregate,
IProjectionStore <string, TProjection> projectionStore = null)
{
return(catchup.Subscribe(Aggregator.Create(aggregate),
projectionStore.AsHandler()));
}
/// <summary>
/// Subscribes the specified aggregator to a catchup.
/// </summary>
/// <typeparam name="TProjection">The type of the projection.</typeparam>
/// <typeparam name="TData">The type of the stream's data.</typeparam>
/// <typeparam name="TCursor">The type of the cursor.</typeparam>
/// <param name="catchup">The catchup.</param>
/// <returns>A disposable that, when disposed, unsubscribes the aggregator.</returns>
public static IDisposable Subscribe <TProjection, TData, TCursor>(
this IStreamCatchup <TData, TCursor> catchup,
AggregateAsync <TProjection, TData> aggregate,
FetchAndSaveProjection <TProjection> manageProjection,
HandleAggregatorError <TProjection> onError = null)
{
return(catchup.Subscribe(Aggregator.Create(aggregate), manageProjection, onError));
}
public AnonymousStreamAggregator(
AggregateAsync <TProjection, TData> aggregate)
{
if (aggregate == null)
{
throw new ArgumentNullException("aggregate");
}
this.aggregate = aggregate;
}
/// <summary>
/// Creates a stream aggregator.
/// </summary>
/// <typeparam name="TProjection">The type of the projection.</typeparam>
/// <typeparam name="TData">The type of the data.</typeparam>
/// <param name="aggregate">Performs aggregation of data from the stream.</param>
public static IStreamAggregator <TProjection, TData> Create <TProjection, TData>(
AggregateAsync <TProjection, TData> aggregate)
{
return(new AnonymousStreamAggregator <TProjection, TData>(aggregate));
}
/// <summary>
/// Traces calls to the specified aggregator function.
/// </summary>
/// <typeparam name="TProjection">The type of the projection.</typeparam>
/// <typeparam name="TData">The type of the data.</typeparam>
/// <param name="aggregate">The aggregator function.</param>
/// <param name="write">A delegate that can be used to specify how the arguments should be traced. If this is not provided, output is sent to <see cref="System.Diagnostics.Trace" />.</param>
/// <returns>The original aggregator wrapped in a tracing decorator.</returns>
public static IStreamAggregator <TProjection, TData> Trace <TProjection, TData>(
this AggregateAsync <TProjection, TData> aggregate,
Action <TProjection, IStreamBatch <TData> > write = null)
{
return(Create(aggregate).Trace(write));
}
