private string Update(IEnumerable <Guid> add = null, IEnumerable <Guid> remove = null)
{
lock (Subscriptions)
{
Subscriptions.UnionWith(add.EmptyIfNull());
Subscriptions.ExceptWith(remove.EmptyIfNull());
return(checksum = Subscriptions.Count + ":" + ChecksumHelper.ComputeHash(Subscriptions));
}
}
public void ChecksumHelperComputesKnownChecksums()
{
var guids = new List <Guid>();
guids.Add(new Guid("d970d9f3-b15b-4c88-8bdc-34fb3f9d119c"));
Assert.AreEqual("e2a5278b5a85bfc1ec258003b697183d8a3330eb750ec3439cbcbfe19e285b87", ChecksumHelper.ComputeHash(guids));
var moreGuids = @"
87c0b82e-00bb-4e7e-b1d4-ae53b4bd6feb
d4b506e5-c70f-47a7-902b-764d2c8ac64a
3ccc7db1-bc5e-476d-b348-752e3695a317
ae6ba09b-6f2a-4ae9-85bd-d770cbfdabc0
81c897ed-ec29-468c-894a-6397911373aa
51dd1835-824f-49c7-be96-45f8cb768aa8
a3c9a21f-e6b4-43e6-a651-ec6c9afde1a0
38edea28-9bca-419a-a85b-8393f468f354
5f21501d-4f10-4258-b7f5-a1979a124b7b
e45bbd78-93dd-42bc-bda9-137f204fbba4"
.Split('\n')
.Select(s => s.Trim())
.Where(s => !string.IsNullOrEmpty(s))
.Select(s => new Guid(s));
Assert.AreEqual("5540cde62cf9871c1b8f69bfd7f2b0047c8ee6f0a613f4e10739ab059adbd618", ChecksumHelper.ComputeHash(guids.Concat(moreGuids)));
}
public void ChecksumHelperComputesChecksumOfAnEmptyList()
{
// sha256 hash of a zero-length buffer
Assert.AreEqual("e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855", ChecksumHelper.ComputeHash(null));
Assert.AreEqual("e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855", ChecksumHelper.ComputeHash(new Guid[0]));
}