private T GetMetricInternal <T>(string name, bool addPrefix, string unit, string description, T metric, bool mustBeNew) where T : MetricBase
{
if (addPrefix)
{
name = MetricsNamePrefix + name;
}
var metricType = typeof(T);
if (metric == null)
{
// if the type has a constructor without params, then create an instance
var constructor = metricType.GetConstructor(BindingFlags.Instance | BindingFlags.Public, null, Type.EmptyTypes, null);
if (constructor == null)
{
throw new ArgumentNullException(nameof(metric), metricType.FullName + " has no public default constructor. Therefore the metric parameter cannot be null.");
}
metric = (T)constructor.Invoke(new object[0]);
}
metric.Collector = this;
metric.Name = name;
metric.Description = description;
metric.Unit = unit;
metric.LoadSuffixes();
lock (_metricsLock)
{
if (_rootNameToInfo.TryGetValue(name, out var rmi))
{
if (rmi.Type != metricType)
{
throw new Exception(
$"Attempted to create metric name \"{name}\" with Type {metricType.FullName}. This metric name has already been bound to Type {rmi.Type.FullName}.");
}
if (rmi.Unit != unit)
{
throw new Exception(
$"Cannot bind metric name \"{name}\" to unit \"{unit}\". It has already been bound to \"{rmi.Unit}\"");
}
}
else if (_nameAndSuffixToRootName.ContainsKey(name))
{
throw new Exception(
$"Attempted to create metric name \"{name}\" with Type {metricType.FullName}. " +
$"This metric name is already in use as a suffix of Type {_rootNameToInfo[_nameAndSuffixToRootName[name]].Type.FullName}.");
}
// claim all suffixes. Do this in two passes (check then add) so we don't end up in an inconsistent state.
foreach (var s in metric.SuffixesArray)
{
var ns = name + s;
// verify this is a valid metric name at all (it should be, since both parts are pre-validated, but just in case).
if (!MetricValidation.IsValidMetricName(ns))
{
throw new Exception($"\"{ns}\" is not a valid metric name");
}
if (_nameAndSuffixToRootName.ContainsKey(ns) && _nameAndSuffixToRootName[ns] != name)
{
throw new Exception(
$"Attempted to create metric name \"{ns}\" with Type {metricType.FullName}. " +
$"This metric name is already in use as a suffix of Type {_rootNameToInfo[_nameAndSuffixToRootName[ns]].Type.FullName}.");
}
}
foreach (var s in metric.SuffixesArray)
{
_nameAndSuffixToRootName[name + s] = name;
}
// claim the root type
_rootNameToInfo[name] = new RootMetricInfo {
Type = metricType, Unit = unit
};
// see if this metric name and tag combination already exists
var key = metric.GetMetricKey();
if (_rootNameAndTagsToMetric.ContainsKey(key))
{
if (mustBeNew)
{
throw new Exception($"Attempted to create duplicate metric with name \"{name}\" and tags {string.Join(", ", metric.Tags.Keys)}.");
}
return((T)_rootNameAndTagsToMetric[key]);
}
// metric doesn't exist yet.
_rootNameAndTagsToMetric[key] = metric;
metric.IsAttached = true;
_hasNewMetadata = true;
var needsPreSerialize = metric.NeedsPreSerializeCalled();
if (needsPreSerialize)
{
_metricsNeedingPreSerialize.Add(metric);
}
_metrics.Add(metric);
if (metric.SerializeInitialValue)
{
if (needsPreSerialize)
{
metric.PreSerializeInternal();
}
foreach (var endpoint in _endpoints)
{
using (var batch = endpoint.Handler.BeginBatch())
{
try
{
metric.SerializeInternal(batch, DateTime.UtcNow);
}
catch (Exception ex)
{
SendExceptionToHandler(ex);
}
}
}
}
return(metric);
}
}
/// <summary>
/// Instantiates a new collector. You should typically only instantiate one collector for the lifetime of your
/// application. It will manage the serialization of metrics and sending data to metric handlers.
/// </summary>
/// <param name="options">
/// <see cref="MetricsCollectorOptions" /> representing the options to use for this collector.
/// </param>
public MetricsCollector(MetricsCollectorOptions options)
{
ExceptionHandler = options.ExceptionHandler ?? (_ => { });
MetricsNamePrefix = options.MetricsNamePrefix ?? "";
if (MetricsNamePrefix != "" && !MetricValidation.IsValidMetricName(MetricsNamePrefix))
{
throw new Exception("\"" + MetricsNamePrefix + "\" is not a valid metric name prefix.");
}
_endpoints = options.Endpoints?.ToImmutableArray() ?? ImmutableArray <MetricEndpoint> .Empty;
_sets = options.Sets?.ToImmutableArray() ?? ImmutableArray <IMetricSet> .Empty;
ThrowOnPostFail = options.ThrowOnPostFail;
ThrowOnQueueFull = options.ThrowOnQueueFull;
ReportingInterval = options.SnapshotInterval;
FlushInterval = options.FlushInterval;
RetryInterval = options.RetryInterval;
PropertyToTagName = options.PropertyToTagName;
TagValueConverter = options.TagValueConverter;
DefaultTags = ValidateDefaultTags(options.DefaultTags);
_maxRetries = 3;
_shutdownTokenSource = new CancellationTokenSource();
// initialize any metric sets
foreach (var set in _sets)
{
set.Initialize(this);
}
// start continuous queue-flushing
_flushTask = Task.Run(
async() =>
{
while (!_shutdownTokenSource.IsCancellationRequested)
{
await Task.Delay(FlushInterval);
try
{
await FlushAsync(true);
}
catch (Exception ex)
{
SendExceptionToHandler(ex);
}
}
});
// start reporting timer
_reportingTask = Task.Run(
async() =>
{
while (!_shutdownTokenSource.IsCancellationRequested)
{
await Task.Delay(ReportingInterval);
try
{
await SnapshotAsync(true);
}
catch (Exception ex)
{
SendExceptionToHandler(ex);
}
}
});
}