public MetricsSnapshot GetSnapshot()
{
var lastSnapshotTime = _lastSnapshotTimestamp;
var currentTime = _clock.GetMillisecondTimestamp();
if (_lastSnapshot == null || currentTime - lastSnapshotTime > _config.GetSnapshotTtlMillis(_key))
{
// Try to update the _lastSnapshotTimestamp. If we update it, this thread will take on the authority of updating
// the snapshot. CompareExchange returns the original result, so if it's different from currentTime, we successfully exchanged.
if (Interlocked.CompareExchange(ref _lastSnapshotTimestamp, currentTime, _lastSnapshotTimestamp) != currentTime)
{
// TODO rob.hruska 11/8/2013 - May be inaccurate if counts are incremented as we're querying these.
var success = _resettingNumbersBucket.GetCount(CounterMetric.CommandSuccess);
var failure = _resettingNumbersBucket.GetCount(CounterMetric.CommandFailure);
var total = success + failure;
int errorPercentage;
if (total == 0)
{
errorPercentage = 0;
}
else
{
errorPercentage = (int)(success == 0 ? 100 : (failure / (double)total) * 100);
}
_lastSnapshot = new MetricsSnapshot(total, errorPercentage);
}
}
return(_lastSnapshot);
}
public MetricsSnapshot GetSnapshot()
{
var stopwatch = Stopwatch.StartNew();
try
{
var lastSnapshotTime = _lastSnapshotTimestamp;
var currentTime = _clock.GetMillisecondTimestamp();
if (_lastSnapshot == null || currentTime - lastSnapshotTime > _snapshotTtlMillis.Value)
{
// Try to update the _lastSnapshotTimestamp. If we update it, this thread will take on the authority of updating
// the snapshot. CompareExchange returns the original result, so if it's different from currentTime, we successfully exchanged.
if (Interlocked.CompareExchange(ref _lastSnapshotTimestamp, currentTime, _lastSnapshotTimestamp) != currentTime)
{
var createwatch = Stopwatch.StartNew();
try
{
// TODO rob.hruska 11/8/2013 - May be inaccurate if counts are incremented as we're querying these.
var success = _resettingNumbersBucket.GetCount(CounterMetric.CommandSuccess);
var failure = _resettingNumbersBucket.GetCount(CounterMetric.CommandFailure);
var total = success + failure;
int errorPercentage;
if (total == 0)
{
errorPercentage = 0;
}
else
{
errorPercentage = (int) (success == 0 ? 100 : (failure / (double) total) * 100);
}
_lastSnapshot = new MetricsSnapshot(total, errorPercentage);
}
finally
{
createwatch.Stop();
_stats.Elapsed(StatsPrefix + " CreateSnapshot", null, createwatch.Elapsed);
}
}
}
return _lastSnapshot;
}
finally
{
_stats.Elapsed(StatsPrefix + " GetSnapshot", null, stopwatch.Elapsed);
}
}