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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>
/// PollingCounter is a variant of EventCounter - it collects and calculates similar statistics
/// as EventCounter. PollingCounter differs from EventCounter in that it takes in a callback
/// function to collect metrics on its own rather than the user having to call WriteMetric()
/// every time.
/// </summary>
internal partial class PollingCounter : BaseCounter
{
/// <summary>
/// Initializes a new instance of the <see cref="PollingCounter"/> class.
/// PollingCounter 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 PollingCounter(string name, EventSource eventSource, Func<float> getMetricFunction) : base(name, eventSource)
{
_getMetricFunction = getMetricFunction;
}
public override string ToString() => $"PollingCounter '{_name}' Count {1} Mean {_lastVal.ToString("n3")}";
private Func<float> _getMetricFunction;
private float _lastVal;
internal override void WritePayload(float intervalSec)
{
lock (MyLock)
{
float value = 0;
try
{
value = _getMetricFunction();
}
catch (Exception ex)
{
ReportOutOfBandMessage($"ERROR: Exception during EventCounter {_name} getMetricFunction callback: " + ex.Message);
}
CounterPayload payload = new CounterPayload();
payload.Name = _name;
payload.DisplayName = (DisplayName == null) ? "" : DisplayName;
payload.Count = 1; // NOTE: These dumb-looking statistics is intentional
payload.IntervalSec = intervalSec;
payload.Mean = value;
payload.Max = value;
payload.Min = value;
payload.StandardDeviation = 0;
_lastVal = value;
_eventSource.Write("EventCounters", new EventSourceOptions() { Level = EventLevel.LogAlways }, new PollingPayloadType(payload));
}
}
}
/// <summary>
/// This is the payload that is sent in the with EventSource.Write
/// </summary>
[EventData]
class PollingPayloadType
{
public PollingPayloadType(CounterPayload payload) { Payload = payload; }
public CounterPayload Payload { get; set; }
}
}
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