/// <summary>
/// Given a cache key, determine which partition the cache item should reside
/// </summary>
public override int GetPartition(object key)
{
// Pull the sub grid origin location for the sub grid or segment represented in the cache key and calculate the
// spatial processing division descriptor to use as the partition affinity key
if (key is IProjectAffinity affinityKey)
{
// Compute partition number as the modulo NumPartitions result against the project iD in the spatial affinity key
return(Math.Abs(GuidHashCode.Hash(affinityKey.ProjectUID)) % Partitions);
}
Log.LogCritical($"Unknown key type to compute non spatial affinity partition key for: type [{key.GetType().FullName}] {key}. Returning partition 0 to avoid thrown exception");
return(0);
//throw new ArgumentException($"Unknown key type to compute non spatial affinity partition key for: [{key.GetType().FullName}] {key}");
}
public void Test_GuidHashCode_HashCode_Divergence(string guidString, int expectedHash)
{
Guid g = new Guid(guidString);
GuidHashCode.Hash(g).Should().Be(expectedHash, $"for Guid value {g}");
}
public void Test_GuidHashCode_HashCode_NotEmpty()
{
Guid g = Guid.NewGuid();
GuidHashCode.Hash(g).Should().NotBe(0, $"for Guid value {g}");
}
public void Test_GuidHashCode_Hash_Empty()
{
// An empty guid (all zeros) should always be 0
GuidHashCode.Hash(Guid.Empty).Should().Be(0);
}
public int GetHashCode(Guid obj) => GuidHashCode.Hash(obj);
public int GetPartition(object key) => Math.Abs(GuidHashCode.Hash(((NonSpatialAffinityKey)key).ProjectID)) % Partitions;
//[Benchmark]
public void GuidHashCode_UsingLessByteArrays_Safe()
{
int hash = GuidHashCode.Hash(guid);
}
//[Benchmark]
public void GuidHashCode_UsingByteArrays()
{
int hash = GuidHashCode.Hash_Old(guid);
}
