private bool DoAcquire(AwaitableLock.ILockRelease lockRelease)
{
if (Tokens > 0)
{
Tokens -= 1;
return(true);
}
CalculateTokenBalanceAndMillisTillNext(lockRelease);
if (Tokens > 0)
{
Tokens -= 1;
return(true);
}
else
{
return(false);
}
}
private int CalculateTokenBalanceAndMillisTillNext(AwaitableLock.ILockRelease @lock)
{
if (@lock == null)
{
throw new Exception("Token balance must be updated within a lock");
}
var now = TimeProvider.GetDateTime();
var millisSince = (int)now.Subtract(_lastToken).TotalMilliseconds;
var periods = millisSince / TokenPeriodMillis;
var newTokens = periods + Tokens > MaxTokens ? MaxTokens : periods + Tokens;
Tokens = newTokens;
var millisToNext = millisSince % TokenPeriodMillis;
_lastToken = now.AddMilliseconds(millisToNext - TokenPeriodMillis);
return(millisToNext);
}
