public void When_the_projector_runs_for_more_than_10_minutes_it_should_only_evaluate_the_last_10_minutes()
{
//-----------------------------------------------------------------------------------------------------------
// Arrange
//-----------------------------------------------------------------------------------------------------------
DateTime nowUtc = 16.June(2017).At(15, 00).AsUtc();
var stats = new ProjectionStats(() => nowUtc);
//-----------------------------------------------------------------------------------------------------------
// Act
//-----------------------------------------------------------------------------------------------------------
long checkpoint = 0;
// The first ten minutes should be ignored
for (int seconds = 0; seconds < (10 * 60); ++seconds)
{
checkpoint += 1000;
stats.TrackProgress("myProjector", checkpoint);
nowUtc = nowUtc.Add(1.Seconds());
}
// Then nine minutes of 2000/s.
for (int seconds = 0; seconds < (9 * 60); ++seconds)
{
checkpoint += 2000;
stats.TrackProgress("myProjector", checkpoint);
nowUtc = nowUtc.Add(1.Seconds());
}
// The last minute should run on 3000/s
for (int seconds = 0; seconds < (60); ++seconds)
{
checkpoint += 3000;
stats.TrackProgress("myProjector", checkpoint);
nowUtc = nowUtc.Add(1.Seconds());
}
//-----------------------------------------------------------------------------------------------------------
// Assert
//-----------------------------------------------------------------------------------------------------------
TimeSpan?eta = stats.GetTimeToReach("myProjector", checkpoint + 100000);
float precalculatedWeightedAveragePerSecond = 2222.5022F;
long secondsToComplete = (long)(100000 / precalculatedWeightedAveragePerSecond);
eta.Should().Be(TimeSpan.FromSeconds(secondsToComplete));
stats.GetSpeed("myProjector").Should().BeApproximately(precalculatedWeightedAveragePerSecond, 1);
}
public void When_the_projector_has_not_checked_in_yet_it_should_not_provide_an_eta()
{
//-----------------------------------------------------------------------------------------------------------
// Arrange
//-----------------------------------------------------------------------------------------------------------
var stats = new ProjectionStats(() => DateTime.UtcNow);
//-----------------------------------------------------------------------------------------------------------
// Act
//-----------------------------------------------------------------------------------------------------------
TimeSpan?eta = stats.GetTimeToReach("myProjector", 100000);
//-----------------------------------------------------------------------------------------------------------
// Assert
//-----------------------------------------------------------------------------------------------------------
eta.Should().NotHaveValue();
stats.GetSpeed("myProjector").Should().BeNull();
}
public void When_the_projectors_speed_increases_it_should_favor_the_higher_speed_in_the_eta()
{
//-----------------------------------------------------------------------------------------------------------
// Arrange
//-----------------------------------------------------------------------------------------------------------
DateTime nowUtc = 16.June(2017).At(15, 00).AsUtc();
var stats = new ProjectionStats(() => nowUtc);
long transactionsPerSecond = 1000;
//-----------------------------------------------------------------------------------------------------------
// Act
//-----------------------------------------------------------------------------------------------------------
long checkpoint = 0;
for (int seconds = 0; seconds < 60; ++seconds)
{
checkpoint += transactionsPerSecond;
stats.TrackProgress("myProjector", checkpoint);
nowUtc = nowUtc.Add(1.Seconds());
transactionsPerSecond += 100;
}
//-----------------------------------------------------------------------------------------------------------
// Assert
//-----------------------------------------------------------------------------------------------------------
TimeSpan?eta = stats.GetTimeToReach("myProjector", checkpoint + 100000);
long weightedAveragePerSecond = 4550;
stats.GetSpeed("myProjector").Should().Be(weightedAveragePerSecond);
long secondsToComplete = 100000 / weightedAveragePerSecond;
eta.Should().Be(TimeSpan.FromSeconds(secondsToComplete));
}
public void When_the_projector_is_ahead_of_the_requested_checkpoint_the_eta_should_be_zero()
{
//-----------------------------------------------------------------------------------------------------------
// Arrange
//-----------------------------------------------------------------------------------------------------------
DateTime utcNow = new DateTime(2017, 7, 4, 11, 50, 0, DateTimeKind.Utc);
var stats = new ProjectionStats(() => utcNow);
stats.TrackProgress("myProjector", 1000);
//-----------------------------------------------------------------------------------------------------------
// Act
//-----------------------------------------------------------------------------------------------------------
utcNow = new DateTime(2017, 7, 4, 11, 52, 0, DateTimeKind.Utc);
stats.TrackProgress("myProjector", 10000);
//-----------------------------------------------------------------------------------------------------------
// Assert
//-----------------------------------------------------------------------------------------------------------
stats.GetSpeed("myProjector").Should().Be((10000 - 1000) / 120);
stats.GetTimeToReach("myProjector", 5000).Should().Be(TimeSpan.Zero);
}
public void When_the_projector_runs_at_a_constant_speed_it_should_use_that_to_calculate_the_eta()
{
//-----------------------------------------------------------------------------------------------------------
// Arrange
//-----------------------------------------------------------------------------------------------------------
DateTime nowUtc = 16.June(2017).At(15, 00).AsUtc();
var stats = new ProjectionStats(() => nowUtc);
long transactionsPerSecond = 1000;
//-----------------------------------------------------------------------------------------------------------
// Act
//-----------------------------------------------------------------------------------------------------------
long checkpoint = 0;
for (int seconds = 0; seconds < 60; ++seconds)
{
checkpoint += transactionsPerSecond;
stats.TrackProgress("myProjector", checkpoint);
nowUtc = nowUtc.Add(1.Seconds());
}
//-----------------------------------------------------------------------------------------------------------
// Assert
//-----------------------------------------------------------------------------------------------------------
TimeSpan?eta = stats.GetTimeToReach("myProjector", 100000);
stats.GetSpeed("myProjector").Should().Be(transactionsPerSecond);
long secondsToComplete = (100000 - checkpoint) / transactionsPerSecond;
eta.Should().Be(TimeSpan.FromSeconds(secondsToComplete));
}