public async Task Projections_can_be_built_from_whole_event_streams_on_demand()
{
var projector = AccountBalanceProjector();
var balanceProjection = await stream.Aggregate(projector);
balanceProjection.Balance.Should().Be(11.11m);
}
public static ISingleStream <Dictionary <string, List <TraceEvent> > > KeepLastTracesPerNode(this IStream <TraceEvent> traceEventStream, int limit = 100)
{
return(traceEventStream.Aggregate("aggregate traces per node type",
i => new LimitedQueue <TraceEvent>(limit),
i => i.NodeName,
(a, e) =>
{
a.Enqueue(e);
return a;
})
.Aggregate("Join all aggregations",
i => new Dictionary <string, List <TraceEvent> >(),
i => true,
(a, l) =>
{
a[l.Key] = l.Aggregation.ToList();
return a;
})
.Select("create aggregation result", i => i.Aggregation)
.First("get single aggregation result"));
}