public void TestThatGenerationIsThreadSafeAndUnique()
{
var results = new ConcurrentQueue <string>();
// Abuse threading here to ensure safety
for (var tryNumber = 0; tryNumber < TryCount; tryNumber++)
{
var generator = new TimeBasedIdGenerator();
Parallel.For(0, EmailCount, currentMail =>
{
var email = _emails[currentMail];
var generated = generator.GenerateId(email);
results.Enqueue(generated);
}
);
// Tolerate the risk of having the same email within the same 200 ms window of a given day
Thread.Sleep(200);
}
Assert.AreEqual(EmailCount * TryCount, results.Count);
var uniqueIds = new HashSet <string>(results);
Assert.IsTrue(uniqueIds.Count <= results.Count);
// Accept a 5 delta
Assert.IsTrue(uniqueIds.Count >= results.Count - 5);
Assert.IsTrue(results.All(x => x.Length == 9));
}
public void TestTimeBasedIdGenerator()
{
var gen = new TimeBasedIdGenerator();
long id0 = gen.GetNextId();
Thread.Sleep(1000);
long id1 = gen.GetNextId();
Assert.AreEqual(1, (id1 & 0xFFFFFF) - (id0 & 0xFFFFFF));
long diff = (id1 >> 24) - (id0 >> 24);
Console.WriteLine("IDs={0:X} , {1:X}, XOR={2:X}", id0, id1, 0);
Console.WriteLine("diff=" + diff);
Assert.AreEqual(1000.0, diff, 10.0);
String s1 = gen.GetNextIdAsString();
String s2 = gen.GetNextIdAsString();
Console.WriteLine("S1=" + s1);
Console.WriteLine("S2=" + s2);
Assert.AreNotEqual(s1, s2);
}
