//Confirms that the numeric hash value does not depend on the number of times the value has been hashed
public void ConfirmHashingToCorrectValues()
{
string servers = "10.10.10.10:6379,20.20.20.20:6379,30.30.30.30:6379,40.40.40.40:6379";
KetamaContinuum ketamaContinuum = new KetamaContinuum(servers);
KetamaHashingAlgorithm_FNV1a32Bit ketamaHashingAlgorithm = new KetamaHashingAlgorithm_FNV1a32Bit();
string key = "ThisIsTheBestHash!!!!";
string server = ketamaContinuum.FindServerForKey(key);
uint hash = ketamaHashingAlgorithm.GetHashFromString(key);
//Console.WriteLine("Hash value for {0} is: {1}, which is found on server: {2}", key, hash, server);
Assert.AreEqual((uint)hash, (uint)1916906286);
hash = ketamaHashingAlgorithm.GetHashFromString(key);
Assert.AreEqual((uint)hash, (uint)1916906286); //Doing it twice to ensure hashing the same string multiple times isn't coming up with different results
key = "thisistheWORSTHASH:( :( :(";
server = ketamaContinuum.FindServerForKey(key);
hash = ketamaHashingAlgorithm.GetHashFromString(key);
//Console.WriteLine("Hash value for {0} is: {1}, which is found on server: {2}", key, hash, server);
Assert.AreEqual((uint)hash, (uint)3993883897);
hash = ketamaHashingAlgorithm.GetHashFromString(key);
Assert.AreEqual((uint)hash, (uint)3993883897); //Doing it twice to ensure hashing the same string multiple times isn't coming up with different results
key = "Stevieweevie";
server = ketamaContinuum.FindServerForKey(key);
hash = ketamaHashingAlgorithm.GetHashFromString(key);
//Console.WriteLine("Hash value for {0} is: {1}, which is found on server: {2}", key, hash, server);
Assert.AreEqual((uint)hash, (uint)3692210458);
hash = ketamaHashingAlgorithm.GetHashFromString(key);
Assert.AreEqual((uint)hash, (uint)3692210458); //Doing it twice to ensure hashing the same string multiple times isn't coming up with different results
}
//[TestMethod] //Uncomment to run a timing test (i.e., see how long it takes for all this to run)
public void HashTimingTest()
{
KetamaHashingAlgorithm_FNV1a32Bit ketamaHashingAlgorithm = new KetamaHashingAlgorithm_FNV1a32Bit();
Stopwatch totalTime = new Stopwatch();
string stringKey = "test_string_value";
for (int total = 10; total <= 10000; total *= 10)
{
totalTime.Reset();
totalTime.Start();
for (int i = 0; i < total; i++)
{
ketamaHashingAlgorithm.GetHashFromString(stringKey + "_" + i);
}
totalTime.Stop();
Debug.WriteLine("Time for " + total + " hashes: " + totalTime.ElapsedMilliseconds.ToString());
}
}
public void HashComparisonTest()
{
string servers = "";
using (StreamReader reader = new StreamReader("../../../../ketama.servers"))
{
string line;
while ((line = reader.ReadLine()) != null)
{
servers = string.Concat(servers, ",", line);
}
servers = servers.Substring(1); //Remove the comma at the head of the string, a side effect of the concatination
}
if (servers == "")
{
Assert.Fail("No servers provided.");
}
KetamaContinuum ketamaContinuum = new KetamaContinuum(servers);
List <uint> hashes = ketamaContinuum.GetAllHashes();
string key;
uint hash;
KetamaHashingAlgorithm_FNV1a32Bit ketamaHashingAlgorithm = new KetamaHashingAlgorithm_FNV1a32Bit();
using (StreamWriter writer = new StreamWriter("../../../../csharp_test.out"))
{
for (int i = 0; i < 100; i++)
{
key = "aab" + i.ToString();
hash = (uint)ketamaHashingAlgorithm.GetHashFromString(key);
Debug.WriteLine(ketamaContinuum.FindServerForKey(key) + " - " + key);
writer.WriteLine(ketamaContinuum.FindServerForKey(key) + " - " + key);
}
}
}