public void should_generate_different_ids_in_a_short_period()
{
var snowflake = new Snowflake();
var lastId = snowflake.Next();
var nextId = snowflake.Next();
nextId.Should().NotBe(lastId);
}
public void should_have_same_machine_id_in_all_generated_ids()
{
var snowflake = new Snowflake();
var lastId = snowflake.Next();
var nextId = snowflake.Next();
var lastMachineId = lastId & MachineIdMask;
var nextMachineId = nextId & MachineIdMask;
nextMachineId.Should().Be(lastMachineId);
}
public void should_generate_equal_or_greater_timestamp_in_id_when_clock_shifted_back()
{
var now = DateTime.UtcNow;
var clockMock = new Mock <IClock>();
clockMock.SetupSequence(c => c.UtcNow)
.Returns(now)
.Returns(now.AddSeconds(-1));
var snowflake = new Snowflake(clock: clockMock.Object, timestampOffset: now.AddMinutes(-1));
var firstId = snowflake.Next();
var lastId = snowflake.Next();
(lastId & TimestampMask).Should().BeGreaterOrEqualTo(firstId & TimestampMask);
}
public async Task should_have_same_specified_machine_id_in_all_generated_ids(string machineIdScript)
{
var machineId = await CSharpScript.EvaluateAsync <int>(machineIdScript,
ScriptOptions.Default.WithReferences(typeof(Snowflake).Assembly));
var snowflake = new Snowflake(machineId);
var lastId = snowflake.Next();
var nextId = snowflake.Next();
var idWithOnlyMachineId = ((long)machineId) << (64 - MachineIdOffset - MachineIdLength);
(lastId & MachineIdMask).Should().Be(idWithOnlyMachineId);
(nextId & MachineIdMask).Should().Be(idWithOnlyMachineId);
}
public EventMessage(string endpoint, EventFlowType flow, IEnumerable <EventParameter> parameters)
{
Id = Snowflake.Next();
Endpoint = endpoint;
Flow = flow;
Parameters = parameters;
}
public void should_generate_positive_number()
{
var snowflake = new Snowflake();
var nextId = snowflake.Next();
nextId.Should().BeGreaterThan(0);
}
public void should_generate_larger_next_id_when_the_last_id_was_generated_100_years_ago()
{
var now = DateTime.UtcNow;
var lastTimestamp = now;
var nextTimestamp = now.AddYears(100);
var clockMock = new Mock <IClock>();
clockMock.SetupSequence(c => c.UtcNow)
.Returns(lastTimestamp)
.Returns(nextTimestamp);
var snowflake = new Snowflake(clock: clockMock.Object, timestampOffset: now);
var lastId = snowflake.Next();
var nextId = snowflake.Next();
nextId.Should().BeGreaterThan(lastId);
}
public void should_generate_one_id_in_less_than_one_millisecond()
{
var snowflake = new Snowflake();
// ReSharper disable once UnusedVariable
var warmupId = snowflake.Next();
var stopwatch = new Stopwatch();
stopwatch.Start();
// ReSharper disable once UnusedVariable
var id = snowflake.Next();
var elapsedMilliseconds = stopwatch.Elapsed.TotalMilliseconds;
#if DEBUG
var limit = 3;
#else
var limit = 1;
#endif
elapsedMilliseconds.Should().BeLessThan(limit);
}
public void should_generate_4096_unique_ids_in_less_than_100_millisecond()
{
var snowflake = new Snowflake();
// ReSharper disable once UnusedVariable
var warmupId = snowflake.Next();
var stopwatch = new Stopwatch();
stopwatch.Start();
var ids = Enumerable.Range(1, 4096)
.Select(i => snowflake.Next())
.AsParallel()
.ToArray();
var elapsed = stopwatch.Elapsed;
#if DEBUG
var limit = 200;
#else
var limit = 100;
#endif
elapsed.TotalMilliseconds.Should().BeLessThan(limit);
var distinctIds = ids.Distinct();
distinctIds.Count().Should().Be(4096);
}
public EventHandler(string endpoint, Delegate @delegate)
{
Id = Snowflake.Next();
Endpoint = endpoint;
Delegate = @delegate;
}
