/// <summary>
///
/// </summary>
/// <param name="stream"></param>
/// <param name="aggregate"></param>
public AggregateBStream(
TumblingWindowBStream <TPayload> stream,
IAggregate <TPayload, TAggState, TResult> aggregate
) : base(stream, stream.Period, stream.Offset)
{
Aggregate = aggregate;
Initialize = Aggregate.InitialState().Compile();
Acc = Aggregate.Accumulate().Compile();
Res = Aggregate.ComputeResult().Compile();
Deacc = Aggregate.Deaccumulate().Compile();
Diff = Aggregate.Difference().Compile();
}
/// <summary>
///
/// </summary>
/// <param name="source"></param>
/// <param name="aggregate"></param>
/// <typeparam name="TPayload"></typeparam>
/// <typeparam name="TAggState"></typeparam>
/// <typeparam name="TResult"></typeparam>
/// <returns></returns>
public static BStreamable <TResult> Aggregate <TPayload, TAggState, TResult>(
this TumblingWindowBStream <TPayload> source,
Func <Window <Empty, TPayload>, IAggregate <TPayload, TAggState, TResult> > aggregate
)
{
Invariant.IsNotNull(source, nameof(source));
Invariant.IsNotNull(aggregate, nameof(aggregate));
var p = new StreamProperties <Empty, TPayload>(
false, true, source.Period, true, source.Period, source.Offset,
false, true, true, true,
EqualityComparerExpression <Empty> .Default, EqualityComparerExpression <TPayload> .Default,
ComparerExpression <Empty> .Default, ComparerExpression <TPayload> .Default, null, null, null
);
return(new AggregateBStream <TPayload, TAggState, TResult>(
source, aggregate(new Window <Empty, TPayload>(p))
));
}
