/// <summary>Creates a new metric definition from the provided information, or returns an existing matching definition if found.</summary>
/// <remarks>If the metric definition doesn't exist, it will be created.
/// If the metric definition does exist, but is not a Custom Sampled Metric (or a derived class) an exception will be thrown.
/// Definitions are looked up and added to the provided definitions dictionary.</remarks>
/// <param name="definitions">The definitions dictionary this definition is a part of</param>
/// <param name="metricTypeName">The unique metric type</param>
/// <param name="categoryName">The name of the category with which this definition is associated.</param>
/// <param name="counterName">The name of the definition within the category.</param>
public static EventMetricDefinition AddOrGet(MetricDefinitionCollection definitions, string metricTypeName, string categoryName, string counterName)
{
//we must have a definitions collection, or we have a problem
if (definitions == null)
{
throw new ArgumentNullException(nameof(definitions));
}
//we need to find the definition, adding it if necessary
string definitionKey = GetKey(metricTypeName, categoryName, counterName);
IMetricDefinition definition;
//We need to grab a lock so our try get & the create are done as one lock.
lock (definitions.Lock)
{
if (definitions.TryGetValue(definitionKey, out definition))
{
//if the metric definition exists, but is of the wrong type we have a problem.
if ((definition is CustomSampledMetricDefinition) == false)
{
throw new ArgumentException("A metric already exists with the provided type, category, and counter name but it is not compatible with being an event metric. Please use a different counter name.", nameof(counterName));
}
}
else
{
//we didn't find one, make a new one
definition = new EventMetricDefinition(definitions, metricTypeName, categoryName, counterName);
definitions.Add(definition); // Add it to the collection, no longer done in the constructor.
// ToDo: Reconsider this implementation; putting incomplete event metric definitions in the collection is not ideal.
}
}
return((EventMetricDefinition)definition);
}
/// <summary>
/// Create a new event metric object from the provided raw data packet
/// </summary>
/// <remarks>The new metric will automatically be added to the metric definition's metrics collection.</remarks>
/// <param name="definition">The object that defines this metric</param>
/// <param name="packet">The raw data packet</param>
internal EventMetric(EventMetricDefinition definition, EventMetricPacket packet)
: base(definition, packet)
{
// We created an EventMetricSampleCollection when base constructor called our OnSampleCollectionCreate().
m_Samples = (EventMetricSampleCollection)base.Samples;
m_MetricDefinition = definition;
m_Packet = packet;
}
/// <summary>
/// Create a new value definition from the provided information.
/// </summary>
/// <param name="definition">The metric definition that owns this value definition</param>
/// <param name="packet">The prepopulated value definition packet.</param>
internal EventMetricValueDefinition(EventMetricDefinition definition, EventMetricValueDefinitionPacket packet)
{
m_Definition = definition;
m_Packet = packet;
//and determine if it is trendable or not
m_Trendable = EventMetricDefinition.IsTrendableValueType(m_Packet.Type);
MyIndex = -1; // Mark it as unknown.
}
/// <summary>Creates a new metric instance or returns an existing one from the provided definition information, or returns any existing instance if found.</summary>
/// <remarks>If the metric definition doesn't exist, it will be created. If the metric doesn't exist, it will be created.
/// If the metric definition does exist, but is not an Event Metric (or a derived class) an exception will be thrown.</remarks>
/// <param name="definitions">The definitions dictionary this definition is a part of</param>
/// <param name="metricTypeName">The unique metric type</param>
/// <param name="categoryName">The name of the category with which this definition is associated.</param>
/// <param name="counterName">The name of the definition within the category.</param>
/// <param name="instanceName">The unique name of this instance within the metric's collection.</param>
/// <returns>The event metric object for the specified event metric instance.</returns>
public static EventMetric AddOrGet(MetricDefinitionCollection definitions, string metricTypeName, string categoryName, string counterName, string instanceName)
{
//we must have a definitions collection, or we have a problem
if (definitions == null)
{
throw new ArgumentNullException(nameof(definitions));
}
//we need to find the definition, adding it if necessary
string definitionKey = MetricDefinition.GetKey(metricTypeName, categoryName, counterName);
IMetricDefinition definition;
if (definitions.TryGetValue(definitionKey, out definition))
{
//if the metric definition exists, but is of the wrong type we have a problem.
if ((definition is EventMetricDefinition) == false)
{
throw new ArgumentException("A metric already exists with the provided type, category, and counter name but it is not compatible with being an event metric. Please use a different counter name.", nameof(counterName));
}
}
else
{
//we didn't find one, make a new one
definition = new EventMetricDefinition(definitions, metricTypeName, categoryName, counterName);
definitions.Add(definition); // Add it to the collection, no longer done in the constructor.
// ToDo: Reconsider this implementation; putting incomplete event metric definitions in the collection is not ideal,
// and creating a metric from an empty event metric definition is fairly pointless.
}
//now we have our definition, proceed to create a new metric if it doesn't exist
string metricKey = MetricDefinition.GetKey(metricTypeName, categoryName, counterName, instanceName);
IMetric metric;
//see if we can get the metric already. If not, we'll create it
lock (((MetricCollection)definition.Metrics).Lock) //make sure the get & add are atomic
{
if (definition.Metrics.TryGetValue(metricKey, out metric) == false)
{
metric = new EventMetric((EventMetricDefinition)definition, instanceName);
}
}
return((EventMetric)metric);
}
/// <summary>
/// Records a value to the values array of this sample given its value definition.
/// </summary>
/// <remarks>The value must be defined as part of the event metric definition associated with this sample
/// or an exception will be thrown. The data type must also be compatible with the data type configured
/// on the event metric definition or no data will be recorded.
/// If called more than once for the same value, the prior value will be replaced.</remarks>
/// <param name="valueDefinition">The metric value definition object of the value to be recorded.</param>
/// <param name="value">The value to be recorded.</param>
public void SetValue(EventMetricValueDefinition valueDefinition, object value)
{
//make sure we got a value definition
if (valueDefinition == null)
{
throw new ArgumentNullException(nameof(valueDefinition));
}
//look up the numerical index in the collection so we know what offset to put it in the array at
int valueIndex = Metric.Definition.Values.IndexOf(valueDefinition);
//if we didn't find it, we're hosed
if (valueIndex < 0)
{
#if DEBUG
//if we're compiled in debug mode, tell the user they blew it.
throw new ArgumentOutOfRangeException(nameof(valueDefinition), valueDefinition.Name);
#else
//log and return, nothing we can do.
if (!Log.SilentMode)
{
Log.Write(LogMessageSeverity.Warning, LogCategory, "Unable to add metric value to the current sample due to missing value definition",
"There is no value definition named {1} for metric definition {0}",
Metric.Definition.Name, valueDefinition.Name);
}
return;
#endif
}
//coerce it into the right type
object storedValue;
if (value == null)
{
//you can always store a null. And we can't really check it more, so there.
storedValue = null;
}
else
{
//get the type so we can verify it
Type valueType = value.GetType();
//is it close enough to what we're expecting?
if (valueDefinition.IsTrendable)
{
if (EventMetricDefinition.IsTrendableValueType(valueType))
{
storedValue = value;
}
else
{
//no, it should be trendable and it isn't. store null.
storedValue = null;
}
}
else
{
//we don't care what it is because we're going to coerce it to a string.
storedValue = value.ToString();
}
}
//now write out the value to the correct spot in the array
Packet.Values[valueIndex] = storedValue;
}
/// <summary>
/// Create a new event metric object from the provided metric definition
/// </summary>
/// <remarks>The new metric will automatically be added to the metric definition's metrics collection.</remarks>
/// <param name="definition">The metric definition for the metric instance</param>
/// <param name="instanceName">The unique name of this instance within the metric's collection.</param>
public EventMetric(EventMetricDefinition definition, string instanceName)
: this(definition, new EventMetricPacket(definition.Packet, instanceName))
{
}
/// <summary>Creates a new metric instance or returns an existing one from the provided definition information, or returns any existing instance if found.</summary>
/// <remarks>If the metric definition doesn't exist, it will be created. If the metric doesn't exist, it will be created.
/// If the metric definition does exist, but is not an Event Metric (or a derived class) an exception will be thrown.
/// Definitions are looked up and added to the active logging metrics collection (Log.Metrics)</remarks>
/// <param name="definition">The metric definition for the metric instance</param>
/// <param name="instanceName">The unique name of this instance within the metric's collection.</param>
/// <returns>The event metric object for the specified event metric instance.</returns>
public static EventMetric AddOrGet(EventMetricDefinition definition, string instanceName)
{
//just forward into our call that requires the definition to be specified
return(AddOrGet(Log.Metrics, definition.MetricTypeName, definition.CategoryName, definition.CounterName, instanceName));
}
/// <summary>
/// Create a new values dictionary for the specified metric definition
/// </summary>
/// <param name="definition">The parent metric definition object that will own this dictionary.</param>
internal EventMetricValueDefinitionCollection(EventMetricDefinition definition)
{
m_Definition = definition;
}
/// <summary>
/// Create a new event metric dictionary for the provided definition.
/// </summary>
/// <remarks>This dictionary is created automatically by the Custom Sampled Metric Definition during its initialization.</remarks>
/// <param name="metricDefinition">The definition of the custom sampled metric to create a metric dictionary for</param>
public EventMetricCollection(EventMetricDefinition metricDefinition)
: base(metricDefinition)
{
}
