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#region Copyright notice and license
// Copyright 2015, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#endregion
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
using System.Threading;
using System.Threading.Tasks;
using Google.Protobuf;
using Grpc.Core;
using Grpc.Core.Utils;
using NUnit.Framework;
using Grpc.Testing;
namespace Grpc.IntegrationTesting
{
/// <summary>
/// Basic implementation of histogram based on grpc/support/histogram.h.
/// </summary>
public class Histogram
{
readonly object myLock = new object();
readonly double multiplier;
readonly double oneOnLogMultiplier;
readonly double maxPossible;
readonly uint[] buckets;
int count;
double sum;
double sumOfSquares;
double min;
double max;
public Histogram(double resolution, double maxPossible)
{
GrpcPreconditions.CheckArgument(resolution > 0);
GrpcPreconditions.CheckArgument(maxPossible > 0);
this.maxPossible = maxPossible;
this.multiplier = 1.0 + resolution;
this.oneOnLogMultiplier = 1.0 / Math.Log(1.0 + resolution);
this.buckets = new uint[FindBucket(maxPossible) + 1];
ResetUnsafe();
}
public void AddObservation(double value)
{
lock (myLock)
{
AddObservationUnsafe(value);
}
}
/// <summary>
/// Gets snapshot of stats and reset
/// </summary>
public HistogramData GetSnapshot(bool reset = false)
{
lock (myLock)
{
return GetSnapshotUnsafe(reset);
}
}
/// <summary>
/// Finds bucket index to which given observation should go.
/// </summary>
private int FindBucket(double value)
{
value = Math.Max(value, 1.0);
value = Math.Min(value, this.maxPossible);
return (int)(Math.Log(value) * oneOnLogMultiplier);
}
private void AddObservationUnsafe(double value)
{
this.count++;
this.sum += value;
this.sumOfSquares += value * value;
this.min = Math.Min(this.min, value);
this.max = Math.Max(this.max, value);
this.buckets[FindBucket(value)]++;
}
private HistogramData GetSnapshotUnsafe(bool reset)
{
var data = new HistogramData
{
Count = count,
Sum = sum,
SumOfSquares = sumOfSquares,
MinSeen = min,
MaxSeen = max,
Bucket = { buckets }
};
if (reset)
{
ResetUnsafe();
}
return data;
}
private void ResetUnsafe()
{
this.count = 0;
this.sum = 0;
this.sumOfSquares = 0;
this.min = double.PositiveInfinity;
this.max = double.NegativeInfinity;
for (int i = 0; i < this.buckets.Length; i++)
{
this.buckets[i] = 0;
}
}
}
}
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