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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Diagnostics;
using System.Collections;
using System.Collections.Generic;
using System.Threading;
#if ES_BUILD_PCL
using System.Threading.Tasks;
#endif
#if ES_BUILD_STANDALONE
namespace Microsoft.Diagnostics.Tracing
#else
namespace System.Diagnostics.Tracing
#endif
{
/// <summary>
/// IncrementingPollingCounter is a variant of EventCounter for variables that are ever-increasing.
/// Ex) # of exceptions in the runtime.
/// It does not calculate statistics like mean, standard deviation, etc. because it only accumulates
/// the counter value.
/// Unlike IncrementingEventCounter, this takes in a polling callback that it can call to update
/// its own metric periodically.
/// </summary>
internal partial class IncrementingPollingCounter : BaseCounter
{
/// <summary>
/// Initializes a new instance of the <see cref="IncrementingPollingCounter"/> class.
/// IncrementingPollingCounter live as long as the EventSource that they are attached to unless they are
/// explicitly Disposed.
/// </summary>
/// <param name="name">The name.</param>
/// <param name="eventSource">The event source.</param>
public IncrementingPollingCounter(string name, EventSource eventSource, Func<float> getCountFunction) : base(name, eventSource)
{
_getCountFunction = getCountFunction;
}
public override string ToString() => $"IncrementingPollingCounter '{_name}' Increment {_increment}";
internal TimeSpan DisplayRateTimeScale { get; set; }
private float _increment;
private float _prevIncrement;
private Func<float> _getCountFunction;
/// <summary>
/// Calls "_getCountFunction" to enqueue the counter value to the queue.
/// </summary>
private void UpdateMetric()
{
try
{
lock(MyLock)
{
_increment += _getCountFunction();
}
}
catch (Exception ex)
{
ReportOutOfBandMessage($"ERROR: Exception during EventCounter {_name} getMetricFunction callback: " + ex.Message);
}
}
internal override void WritePayload(float intervalSec)
{
UpdateMetric();
lock (MyLock) // Lock the counter
{
IncrementingCounterPayload payload = new IncrementingCounterPayload();
payload.Name = _name;
payload.DisplayName = DisplayName ?? "";
payload.DisplayRateTimeScale = (DisplayRateTimeScale == TimeSpan.Zero) ? "" : DisplayRateTimeScale.ToString("c");
payload.IntervalSec = intervalSec;
payload.MetaData = GetMetaDataString();
payload.Increment = _increment - _prevIncrement;
_prevIncrement = _increment;
_eventSource.Write("EventCounters", new EventSourceOptions() { Level = EventLevel.LogAlways }, new IncrementingPollingCounterPayloadType(payload));
}
}
}
/// <summary>
/// This is the payload that is sent in the with EventSource.Write
/// </summary>
[EventData]
class IncrementingPollingCounterPayloadType
{
public IncrementingPollingCounterPayloadType(IncrementingCounterPayload payload) { Payload = payload; }
public IncrementingCounterPayload Payload { get; set; }
}
}
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