public IPAddress Pick(BigInteger?token)
{
IPAddress endpoint = null;
if (0 < _healthyEndpoints.Count)
{
if (token.HasValue && 0 < _ring.RingSize())
{
//Attempt to binary search for key in token ring
lock (_lock)
{
endpoint = _ring.FindReplica(token.Value);
}
}
else
{
//fallback to round robin when no hint supplied
lock (_lock)
{
_nextCandidate = (_nextCandidate + 1) % _healthyEndpoints.Count;
endpoint = _healthyEndpoints[_nextCandidate];
}
}
}
return(endpoint);
}
public IPAddress Pick(BigInteger?token)
{
var currentHealthy = _healthyEndpoints;
if (0 < currentHealthy.Length)
{
if (token.HasValue && 0 < _ring.RingSize())
{
//Attempt to binary search for key in token ring
lock (_ring)
{
return(_ring.FindReplica(token.Value));
}
}
else
{
//fallback to round robin when no hint supplied
switch (currentHealthy.Length)
{
case 0:
return(null);
case 1:
return(currentHealthy[0]);
}
int nextCandidate = Interlocked.Increment(ref _nextCandidate);
if (nextCandidate < currentHealthy.Length)
{
return(currentHealthy[nextCandidate]);
}
var fix_candidate = nextCandidate % currentHealthy.Length;
Interlocked.CompareExchange(ref _nextCandidate, fix_candidate, nextCandidate);
return(currentHealthy[fix_candidate]);
}
}
return(null);
}