55 lines
1.4 KiB
C#
55 lines
1.4 KiB
C#
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using System;
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using System.Security.Cryptography;
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namespace Quasar.Common.Utilities
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{
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/// <summary>
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/// Thread-safe random number generator.
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/// Has same API as System.Random but is thread safe, similar to the implementation by Steven Toub: http://blogs.msdn.com/b/pfxteam/archive/2014/10/20/9434171.aspx
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/// </summary>
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public class SafeRandom
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{
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private static readonly RandomNumberGenerator GlobalCryptoProvider = RandomNumberGenerator.Create();
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[ThreadStatic]
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private static Random _random;
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private static Random GetRandom()
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{
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if (_random == null)
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{
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byte[] buffer = new byte[4];
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GlobalCryptoProvider.GetBytes(buffer);
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_random = new Random(BitConverter.ToInt32(buffer, 0));
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}
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return _random;
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}
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public int Next()
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{
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return GetRandom().Next();
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}
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public int Next(int maxValue)
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{
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return GetRandom().Next(maxValue);
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}
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public int Next(int minValue, int maxValue)
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{
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return GetRandom().Next(minValue, maxValue);
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}
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public void NextBytes(byte[] buffer)
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{
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GetRandom().NextBytes(buffer);
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}
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public double NextDouble()
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{
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return GetRandom().NextDouble();
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}
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}
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}
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