public void DistributedIdFactory_Create_Exhaust()
{
DateTime old = DateTime.Now.AddYears(-400);
var factory = new DistributedIdFactory(old, 0);
InvalidOperationException e = Assert.Throws <InvalidOperationException>(() => factory.Create());
Assert.Equal("All distributed identifiers have been exhausted for the epoch.", e.Message);
}
public void DistributedIdFactory_Properties()
{
DateTime epoch = DateTime.Now;
var factory = new DistributedIdFactory(epoch, 123);
Assert.Equal(epoch.ToUniversalTime(), factory.Epoch);
Assert.Equal(123, factory.MachineId);
}
public void DistributedIdFactory_Create_Competing()
{
const int threadCount = 10;
const int iterations = 10000;
var factory = new DistributedIdFactory(DateTime.Now, 0);
var threads = new Thread[threadCount];
var bigHs = new HashSet <DistributedId>(threadCount * iterations);
Exception ex = null;
using (var mut = new ManualResetEvent(false))
{
for (var i = 0; i < threads.Length; i++)
{
threads[i] = new Thread(() =>
{
try
{
mut.WaitOne();
var hs = new HashSet <DistributedId>();
for (var j = 0; j < iterations; j++)
{
hs.Add(factory.Create());
}
lock (bigHs) bigHs.UnionWith(hs);
}
catch (Exception e)
{
ex = e;
}
});
threads[i].Start();
}
mut.Set();
for (var i = 0; i < threads.Length; i++)
{
threads[i].Join();
}
Assert.Null(ex);
Assert.Equal(threadCount * iterations, bigHs.Count);
}
}