/// <summary>
/// Buffers the specified message to be asynchronously logged.
/// </summary>
/// <param name="message">The message to log.</param>
public void Log(string message)
{
// which period number within the day are we in right now?
TimeSpan timeOfDay = AmbientClock.UtcNow.TimeOfDay;
int newPeriodNumber = (int)(timeOfDay.TotalMinutes / _rotationPeriodMinutes);
int attempt = 0;
// loop attempting to update the period number if we need to or until we win the race or timeout
while (true)
{
// get the latest value
int oldValue = _periodNumber;
// someone beat us to it?
if (newPeriodNumber == oldValue)
{
break;
}
// try to put in our value--did we win the race?
if (oldValue == System.Threading.Interlocked.CompareExchange(ref _periodNumber, newPeriodNumber, oldValue))
{
// we won the race to update the period number
_fileBuffers.BufferFileRotation(PeriodString(newPeriodNumber) + _fileExtension);
break;
}
// note that it's very difficult to test a miss here--you really have to pound it with multiple threads, so this next line (and the not equal condition on the "if" above are not likely to get covered
if (!InterlockedExtensions.TryAgainAfterOptomisticMissDelay(attempt++))
{
break;
}
}
if (!_disposedValue)
{
_fileBuffers.BufferLine(message);
}
}
