/// <summary>
/// Increments the current extension by one. Do this before passing the value to an
/// outbound message header.
/// </summary>
/// <returns>
/// The new value as a string that you can add to the outbound message header
/// indicated by <see cref="HeaderName"/>.
/// </returns>
public string Increment()
{
if (this.immutable)
{
return(this.Value);
}
int snapshot = 0;
int next = 0;
do
{
snapshot = this.extension;
if (snapshot == int.MaxValue)
{
return(this.Value);
}
next = snapshot + 1;
if (CorrelationVector.IsOversized(this.BaseVector, next, this.Version))
{
this.immutable = true;
return(this.Value);
}
}while (snapshot != Interlocked.CompareExchange(ref this.extension, next, snapshot));
return(string.Concat(this.BaseVector, ".", next));
}
private CorrelationVector(string baseVector, int extension, CorrelationVectorVersion version, bool immutable)
{
this.BaseVector = baseVector;
this.extension = extension;
this.Version = version;
this.immutable = immutable || CorrelationVector.IsOversized(baseVector, extension, version);
}
/// <summary>
/// Creates a new correlation vector by applying the Spin operator to an existing value.
/// This should be done at the entry point of an operation.
/// </summary>
/// <param name="correlationVector">
/// Taken from the message header indicated by <see cref="HeaderName"/>.
/// </param>
/// <param name="parameters">
/// The parameters to use when applying the Spin operator.
/// </param>
/// <returns>A new correlation vector extended from the current vector.</returns>
public static CorrelationVector Spin(string correlationVector, SpinParameters parameters)
{
if (CorrelationVector.IsImmutable(correlationVector))
{
return(CorrelationVector.Parse(correlationVector));
}
CorrelationVectorVersion version = CorrelationVector.InferVersion(
correlationVector, CorrelationVector.ValidateCorrelationVectorDuringCreation);
if (CorrelationVector.ValidateCorrelationVectorDuringCreation)
{
CorrelationVector.Validate(correlationVector, version);
}
byte[] entropy = new byte[parameters.EntropyBytes];
rng.NextBytes(entropy);
ulong value = (ulong)(DateTime.UtcNow.Ticks >> parameters.TicksBitsToDrop);
for (int i = 0; i < parameters.EntropyBytes; i++)
{
value = (value << 8) | Convert.ToUInt64(entropy[i]);
}
// Generate a bitmask and mask the lower TotalBits in the value.
// The mask is generated by (1 << TotalBits) - 1. We need to handle the edge case
// when shifting 64 bits, as it wraps around.
value &= (parameters.TotalBits == 64 ? 0 : (ulong)1 << parameters.TotalBits) - 1;
string s = unchecked ((uint)value).ToString();
if (parameters.TotalBits > 32)
{
s = string.Concat((value >> 32).ToString(), ".", s);
}
string baseVector = string.Concat(correlationVector, ".", s);
if (CorrelationVector.IsOversized(baseVector, 0, version))
{
return(CorrelationVector.Parse(correlationVector + CorrelationVector.TerminationSign));
}
return(new CorrelationVector(baseVector, 0, version, false));
}
/// <summary>
/// Creates a new correlation vector by extending an existing value. This should be
/// done at the entry point of an operation.
/// </summary>
/// <param name="correlationVector">
/// Taken from the message header indicated by <see cref="HeaderName"/>.
/// </param>
/// <returns>A new correlation vector extended from the current vector.</returns>
public static CorrelationVector Extend(string correlationVector)
{
if (CorrelationVector.IsImmutable(correlationVector))
{
return(CorrelationVector.Parse(correlationVector));
}
CorrelationVectorVersion version = CorrelationVector.InferVersion(
correlationVector, CorrelationVector.ValidateCorrelationVectorDuringCreation);
if (CorrelationVector.ValidateCorrelationVectorDuringCreation)
{
CorrelationVector.Validate(correlationVector, version);
}
if (CorrelationVector.IsOversized(correlationVector, 0, version))
{
return(CorrelationVector.Parse(correlationVector + CorrelationVector.TerminationSign));
}
return(new CorrelationVector(correlationVector, 0, version, false));
}
