/// <summary>
/// Generate a deterministic Guid from a queue Id.
/// </summary>
/// <param name="queueId"></param>
/// <returns></returns>
private Guid GenerateDeterministicGuid(QueueId queueId)
{
// provider name hash code
int providerNameGuidHash = (int)JenkinsHash.ComputeHash(this.Name);
// get queueId hash code
uint queueIdHash = queueId.GetUniformHashCode();
byte[] queIdHashByes = BitConverter.GetBytes(queueIdHash);
short s1 = BitConverter.ToInt16(queIdHashByes, 0);
short s2 = BitConverter.ToInt16(queIdHashByes, 2);
// build guid tailing 8 bytes from providerNameGuidHash and queIdHashByes.
var tail = new List <byte>();
tail.AddRange(BitConverter.GetBytes(providerNameGuidHash));
tail.AddRange(queIdHashByes);
// make guid.
// - First int is provider name hash
// - Two shorts from queue Id hash
// - 8 byte tail from provider name hash and queue Id hash.
return(new Guid(providerNameGuidHash, s1, s2, tail.ToArray()));
}
/// <summary>
/// <see cref="IHasher.Hash(byte[])"/>.
/// </summary>
public int Hash(byte[] data)
{
return(unchecked ((int)JenkinsHash.ComputeHash(data)));
}
public uint GenerateHash(ulong Key)
{
return(JenkinsHash.ComputeHash(BitConverter.GetBytes(Key)));
}
public uint GenerateHash(Guid Key)
{
return(JenkinsHash.ComputeHash(Key.ToByteArray()));
}
public uint GenerateHash(string Key)
{
return(JenkinsHash.ComputeHash(Key));
}
public TypeKey(byte[] key)
{
HashCode = unchecked ((int)JenkinsHash.ComputeHash(key));
TypeName = key;
}
/// <summary>
/// Performs the Jenkins hash on an input byte array
/// </summary>
public static byte[] JenkinsHash( byte[] input )
{
using ( JenkinsHash jHash = new JenkinsHash() )
{
byte[] hash = jHash.ComputeHash( input );
Array.Reverse( hash );
return hash;
}
}
private static int GetHashCode(byte[] value) => (int)JenkinsHash.ComputeHash(value);
internal StreamId(byte[] fullKey, ushort keyIndex)
: this(fullKey, keyIndex, (int)JenkinsHash.ComputeHash(fullKey))
{
}
internal StreamId(Memory <byte> fullKey, ushort keyIndex)
: this(fullKey, keyIndex, (int)JenkinsHash.ComputeHash(fullKey.ToArray()))
{
}
