public void RestoreTimeIsLinear()
{
var createCheckpointInterval = TimeSpan.FromMinutes(10);
var heartbeatInterval = TimeSpan.FromMinutes(1);
var restoreDelta = RestoreCheckpointPacemaker.ComputeRestoreTime(createCheckpointInterval, 10, 1);
restoreDelta.Should().Be(TimeSpan.FromMinutes(1));
}
public void SampledBucketIsInRange(int numSamples, uint buckets)
{
var gen = ThreadSafeRandom.Generator;
for (var i = 0; i < numSamples; ++i)
{
var bucket = RestoreCheckpointPacemaker.SampleBucket(buckets, gen.NextDouble());
bucket.Should().BeInRange(0, buckets);
}
}
public void SampledIdentifiersAreBetween0And1(int numSamples)
{
var checkpointTime = DateTime.UtcNow;
for (var i = 0; i < numSamples; ++i)
{
var sample = RestoreCheckpointPacemaker.SampleIdentifier(ThreadSafeRandom.GetBytes(10), checkpointTime);
sample.Should().BeInRange(0, 1);
}
}
public void SampledIdentifiersDontChangeUnlessCheckpointTimeDoes(int numSamples)
{
for (var i = 0; i < numSamples; ++i)
{
var checkpointTime = DateTime.UtcNow;
var machine = ThreadSafeRandom.GetBytes(10);
var sample1 = RestoreCheckpointPacemaker.SampleIdentifier(machine, checkpointTime);
var sample2 = RestoreCheckpointPacemaker.SampleIdentifier(machine, checkpointTime);
sample1.Should().Be(sample2);
var checkpointTime2 = checkpointTime + TimeSpan.FromSeconds(1);
var sample3 = RestoreCheckpointPacemaker.SampleIdentifier(machine, checkpointTime2);
var sample4 = RestoreCheckpointPacemaker.SampleIdentifier(machine, checkpointTime2);
sample1.Should().NotBe(sample3);
sample3.Should().Be(sample4);
}
}
