internal StandardCommandMetrics(GroupKey key, IFailurePercentageCircuitBreakerConfig config, IClock clock, IMjolnirLogFactory logFactory)
{
_config = config ?? throw new ArgumentNullException(nameof(config));
_clock = clock ?? throw new ArgumentNullException(nameof(clock));
_key = key;
_resettingNumbersBucket = new ResettingNumbersBucket(_key, _clock, _config, logFactory);
}
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);
}
});
}
internal ResettingNumbersBucket(GroupKey key, IClock clock, IFailurePercentageCircuitBreakerConfig config, IMjolnirLogFactory logFactory)
{
_key = key;
_clock = clock ?? throw new ArgumentNullException(nameof(clock));
_config = config ?? throw new ArgumentNullException(nameof(config));
if (logFactory == null)
{
throw new ArgumentNullException(nameof(logFactory));
}
_log = logFactory.CreateLog <ResettingNumbersBucket>();
if (_log == null)
{
throw new InvalidOperationException($"{nameof(IMjolnirLogFactory)} implementation returned null from {nameof(IMjolnirLogFactory.CreateLog)} for type {typeof(ResettingNumbersBucket)}, please make sure the implementation returns a non-null log for all calls to {nameof(IMjolnirLogFactory.CreateLog)}");
}
_counters = CreateCounters();
_lastResetAtTime = clock.GetMillisecondTimestamp();
}
internal FailurePercentageCircuitBreaker(GroupKey key, IClock clock, ICommandMetrics metrics, IMetricEvents metricEvents, IFailurePercentageCircuitBreakerConfig config, IMjolnirLogFactory logFactory)
{
_metrics = metrics ?? throw new ArgumentNullException(nameof(metrics));
_clock = clock ?? throw new ArgumentNullException(nameof(config));
_config = config ?? throw new ArgumentNullException(nameof(config));
_metricEvents = metricEvents ?? throw new ArgumentNullException(nameof(metricEvents));
if (logFactory == null)
{
throw new ArgumentNullException(nameof(logFactory));
}
_key = key;
_log = logFactory.CreateLog <FailurePercentageCircuitBreaker>();
if (_log == null)
{
throw new InvalidOperationException($"{nameof(IMjolnirLogFactory)} implementation returned null from {nameof(IMjolnirLogFactory.CreateLog)} for type {typeof(FailurePercentageCircuitBreaker)}, please make sure the implementation returns a non-null log for all calls to {nameof(IMjolnirLogFactory.CreateLog)}");
}
_state = State.Fixed; // Start off assuming everything's fixed.
_lastTrippedTimestamp = 0; // 0 is fine since it'll be far less than the first compared value.
}
internal StandardCommandMetrics(GroupKey key, IFailurePercentageCircuitBreakerConfig config, IMjolnirLogFactory logFactory)
: this(key, config, new UtcSystemClock(), logFactory)
{
}
internal FailurePercentageCircuitBreaker(GroupKey key, ICommandMetrics metrics, IMetricEvents metricEvents, IFailurePercentageCircuitBreakerConfig config, IMjolnirLogFactory logFactory)
: this(key, new UtcSystemClock(), metrics, metricEvents, config, logFactory)
{
}
internal ResettingNumbersBucket(GroupKey key, IFailurePercentageCircuitBreakerConfig config, IMjolnirLogFactory logFactory) : this(key, new UtcSystemClock(), config, logFactory)
{
}