internal void Increment(CounterMetric metric)
{
// Notes:
// - If we have long periods with no stats, we won't reset until we get one.
// - This is a "pretty close" implementation.
// - Accuracy on Gets isn't 100% and is subject to racing.
// - We may write metrics into "old" buckets immediately before resetting at the interval.
if (_clock.GetMillisecondTimestamp() - _lastResetAtTime > _config.GetWindowMillis(_key))
{
Reset();
}
// See note in Reset() about potential for losing current window counts here.
_counters[(int)metric].Increment();
}
public CircuitBreakerFactory(IMetricEvents metricEvents, IFailurePercentageCircuitBreakerConfig breakerConfig, IMjolnirLogFactory logFactory)
{
_metricEvents = metricEvents ?? throw new ArgumentNullException(nameof(metricEvents));
_breakerConfig = breakerConfig ?? throw new ArgumentNullException(nameof(breakerConfig));
_logFactory = logFactory ?? throw new ArgumentNullException(nameof(logFactory));
_log = logFactory.CreateLog <FailurePercentageCircuitBreaker>();
if (_log == null)
{
throw new InvalidOperationException($"{nameof(IMjolnirLogFactory)} implementation returned null from {nameof(IMjolnirLogFactory.CreateLog)} for type {typeof(CircuitBreakerFactory)}, please make sure the implementation returns a non-null log for all calls to {nameof(IMjolnirLogFactory.CreateLog)}");
}
_timer = new GaugeTimer(state =>
{
try
{
var keys = _circuitBreakers.Keys;
foreach (var key in keys)
{
if (_circuitBreakers.TryGetValue(key, out Lazy <FailurePercentageCircuitBreaker> lazy) && lazy.IsValueCreated)
{
var breaker = lazy.Value;
_metricEvents.BreakerGauge(
breaker.Name,
_breakerConfig.GetMinimumOperations(key),
_breakerConfig.GetWindowMillis(key),
_breakerConfig.GetThresholdPercentage(key),
_breakerConfig.GetTrippedDurationMillis(key),
_breakerConfig.GetForceTripped(key),
_breakerConfig.GetForceFixed(key),
breaker.IsTripped(),
breaker.Metrics.SuccessCount,
breaker.Metrics.FailureCount);
}
}
}
catch (Exception e)
{
_log.Error($"Error sending {nameof(IMetricEvents.BreakerGauge)} metric event", e);
}
});
}