File size: 5,207 Bytes
8c763fb | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 | // 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.Collections.Generic;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
namespace BenchmarkDotNet.Extensions
{
public static class ValuesGenerator
{
private const int Seed = 12345; // we always use the same seed to have repeatable results!
public static T GetNonDefaultValue<T>()
{
if (typeof(T) == typeof(byte)) // we can't use ArrayOfUniqueValues for byte
return Array<T>(byte.MaxValue).First(value => !value.Equals(default));
else
return ArrayOfUniqueValues<T>(2).First(value => !value.Equals(default));
}
/// <summary>
/// does not support byte because there are only 256 unique byte values
/// </summary>
public static T[] ArrayOfUniqueValues<T>(int count)
{
// allocate the array first to try to take advantage of memory randomization
// as it's usually the first thing called from GlobalSetup method
// which with MemoryRandomization enabled is the first method called right after allocation
// of random-sized memory by BDN engine
T[] result = new T[count];
var random = new Random(Seed);
var uniqueValues = new HashSet<T>();
while (uniqueValues.Count != count)
{
T value = GenerateValue<T>(random);
if (!uniqueValues.Contains(value))
uniqueValues.Add(value);
}
uniqueValues.CopyTo(result);
return result;
}
public static T[] Array<T>(int count)
{
var result = new T[count];
var random = new Random(Seed);
if (typeof(T) == typeof(byte) || typeof(T) == typeof(sbyte))
{
random.NextBytes(Unsafe.As<byte[]>(result));
}
else
{
for (int i = 0; i < result.Length; i++)
{
result[i] = GenerateValue<T>(random);
}
}
return result;
}
public static Dictionary<TKey, TValue> Dictionary<TKey, TValue>(int count)
{
var dictionary = new Dictionary<TKey, TValue>();
var random = new Random(Seed);
while (dictionary.Count != count)
{
TKey key = GenerateValue<TKey>(random);
if (!dictionary.ContainsKey(key))
dictionary.Add(key, GenerateValue<TValue>(random));
}
return dictionary;
}
private static T GenerateValue<T>(Random random)
{
if (typeof(T) == typeof(char))
return (T)(object)(char)random.Next(char.MinValue, char.MaxValue);
if (typeof(T) == typeof(short))
return (T)(object)(short)random.Next(short.MaxValue);
if (typeof(T) == typeof(ushort))
return (T)(object)(ushort)random.Next(short.MaxValue);
if (typeof(T) == typeof(int))
return (T)(object)random.Next();
if (typeof(T) == typeof(uint))
return (T)(object)(uint)random.Next();
if (typeof(T) == typeof(long))
return (T)(object)(long)random.Next();
if (typeof(T) == typeof(ulong))
return (T)(object)(ulong)random.Next();
if (typeof(T) == typeof(float))
return (T)(object)(float)random.NextDouble();
if (typeof(T) == typeof(double))
return (T)(object)random.NextDouble();
if (typeof(T) == typeof(bool))
return (T)(object)(random.NextDouble() > 0.5);
if (typeof(T) == typeof(string))
return (T)(object)GenerateRandomString(random, 1, 50);
if (typeof(T) == typeof(Guid))
return (T)(object)GenerateRandomGuid(random);
throw new NotImplementedException($"{typeof(T).Name} is not implemented");
}
private static string GenerateRandomString(Random random, int minLength, int maxLength)
{
var length = random.Next(minLength, maxLength);
var builder = new StringBuilder(length);
for (int i = 0; i < length; i++)
{
var rangeSelector = random.Next(0, 3);
if (rangeSelector == 0)
builder.Append((char) random.Next('a', 'z'));
else if (rangeSelector == 1)
builder.Append((char) random.Next('A', 'Z'));
else
builder.Append((char) random.Next('0', '9'));
}
return builder.ToString();
}
private static Guid GenerateRandomGuid(Random random)
{
byte[] bytes = new byte[16];
random.NextBytes(bytes);
return new Guid(bytes);
}
}
}
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