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#region Copyright notice and license
// Copyright 2015 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#endregion
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Grpc.Core;
using Grpc.Core.Utils;
using Grpc.Testing;
using NUnit.Framework;
namespace Grpc.IntegrationTesting
{
public class HistogramTest
{
[Test]
public void Simple()
{
var hist = new Histogram(0.01, 60e9);
hist.AddObservation(10000);
hist.AddObservation(10000);
hist.AddObservation(11000);
hist.AddObservation(11000);
var data = hist.GetSnapshot();
Assert.AreEqual(4, data.Count);
Assert.AreEqual(42000.0, data.Sum, 1e-6);
Assert.AreEqual(10000, data.MinSeen);
Assert.AreEqual(11000, data.MaxSeen);
Assert.AreEqual(2.0*10000*10000 + 2.0*11000*11000, data.SumOfSquares, 1e-6);
// 1.01^925 < 10000 < 1.01^926
Assert.AreEqual(2, data.Bucket[925]);
Assert.AreEqual(2, data.Bucket[935]);
}
[Test]
public void ExtremeObservations()
{
var hist = new Histogram(0.01, 60e9);
hist.AddObservation(-0.5); // should be in the first bucket
hist.AddObservation(1e12); // should be in the last bucket
var data = hist.GetSnapshot();
Assert.AreEqual(1, data.Bucket[0]);
Assert.AreEqual(1, data.Bucket[data.Bucket.Count - 1]);
}
[Test]
public void MergeSnapshots()
{
var data = new HistogramData();
var hist1 = new Histogram(0.01, 60e9);
hist1.AddObservation(-0.5); // should be in the first bucket
hist1.AddObservation(1e12); // should be in the last bucket
hist1.GetSnapshot(data, false);
var hist2 = new Histogram(0.01, 60e9);
hist2.AddObservation(10000);
hist2.AddObservation(11000);
hist2.GetSnapshot(data, false);
Assert.AreEqual(4, data.Count);
Assert.AreEqual(-0.5, data.MinSeen);
Assert.AreEqual(1e12, data.MaxSeen);
Assert.AreEqual(1, data.Bucket[0]);
Assert.AreEqual(1, data.Bucket[925]);
Assert.AreEqual(1, data.Bucket[935]);
Assert.AreEqual(1, data.Bucket[data.Bucket.Count - 1]);
}
[Test]
public void Reset()
{
var hist = new Histogram(0.01, 60e9);
hist.AddObservation(10000);
hist.AddObservation(11000);
var data = hist.GetSnapshot(true); // snapshot contains data before reset
Assert.AreEqual(2, data.Count);
Assert.AreEqual(10000, data.MinSeen);
Assert.AreEqual(11000, data.MaxSeen);
data = hist.GetSnapshot(); // snapshot contains state after reset
Assert.AreEqual(0, data.Count);
Assert.AreEqual(double.PositiveInfinity, data.MinSeen);
Assert.AreEqual(double.NegativeInfinity, data.MaxSeen);
Assert.AreEqual(0, data.Sum);
Assert.AreEqual(0, data.SumOfSquares);
CollectionAssert.AreEqual(new uint[data.Bucket.Count], data.Bucket);
}
}
}
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