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40 changes: 40 additions & 0 deletions
40
Creational/DesignPatterns.Singleton.UnitTests/DesignPatterns.Singleton.UnitTests.csproj
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,40 @@ | ||
| <Project Sdk="Microsoft.NET.Sdk"> | ||
|
|
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| <PropertyGroup> | ||
| <TargetFramework>net8.0</TargetFramework> | ||
| <ImplicitUsings>enable</ImplicitUsings> | ||
| <Nullable>enable</Nullable> | ||
| <IsPackable>false</IsPackable> | ||
| <IsTestProject>true</IsTestProject> | ||
| </PropertyGroup> | ||
|
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| <ItemGroup> | ||
| <PackageReference Include="AutoFixture" Version="4.18.1" /> | ||
| <PackageReference Include="FluentAssertions" Version="6.12.0" /> | ||
| <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" /> | ||
| <PackageReference Include="Moq" Version="4.20.70" /> | ||
| <PackageReference Include="Shouldly" Version="4.2.1" /> | ||
| <PackageReference Include="xunit" Version="2.6.5" /> | ||
| <PackageReference Include="xunit.runner.visualstudio" Version="2.5.6"> | ||
| <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets> | ||
| <PrivateAssets>all</PrivateAssets> | ||
| </PackageReference> | ||
| <PackageReference Include="coverlet.collector" Version="6.0.0"> | ||
| <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets> | ||
| <PrivateAssets>all</PrivateAssets> | ||
| </PackageReference> | ||
| <PackageReference Include="coverlet.msbuild" Version="6.0.0"> | ||
| <PrivateAssets>all</PrivateAssets> | ||
| <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets> | ||
| </PackageReference> | ||
| </ItemGroup> | ||
|
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| <ItemGroup> | ||
| <ProjectReference Include="..\DesignPatterns.Singleton\DesignPatterns.Singleton.csproj" /> | ||
| </ItemGroup> | ||
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| <ItemGroup> | ||
| <ProjectReference Include="..\DesignPatterns.Singleton\DesignPatterns.Singleton.csproj" /> | ||
| </ItemGroup> | ||
|
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| </Project> |
16 changes: 16 additions & 0 deletions
16
Creational/DesignPatterns.Singleton.UnitTests/SingletonWithLazyTests.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,16 @@ | ||
| using Shouldly; | ||
| using Xunit; | ||
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| namespace DesignPatterns.Singleton.UnitTests; | ||
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| public class SingletonWithLazyTests | ||
| { | ||
| [Fact] | ||
| public void Given_WhenCreateSingletonWithLazy_ThenSameInstancesReturned() | ||
| { | ||
| var firstInstance = SingletonWithLazy.Instance; | ||
| var secondInstance = SingletonWithLazy.Instance; | ||
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| firstInstance.ShouldBe(secondInstance); | ||
| } | ||
| } |
16 changes: 16 additions & 0 deletions
16
Creational/DesignPatterns.Singleton.UnitTests/SingletonWithLockTests.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,16 @@ | ||
| using Shouldly; | ||
| using Xunit; | ||
|
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| namespace DesignPatterns.Singleton.UnitTests; | ||
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| public class SingletonWithLockTests | ||
| { | ||
| [Fact] | ||
| public void Given_WhenCreateSingletonWithLock_ThenSameInstancesReturned() | ||
| { | ||
| var firstInstance = SingletonWithLock.Instance; | ||
| var secondInstance = SingletonWithLock.Instance; | ||
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| firstInstance.ShouldBe(secondInstance); | ||
| } | ||
| } |
14 changes: 14 additions & 0 deletions
14
Creational/DesignPatterns.Singleton/DesignPatterns.Singleton.csproj
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,14 @@ | ||
| <Project Sdk="Microsoft.NET.Sdk"> | ||
|
|
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| <PropertyGroup> | ||
| <OutputType>Exe</OutputType> | ||
| <TargetFramework>net8.0</TargetFramework> | ||
| <ImplicitUsings>enable</ImplicitUsings> | ||
| <Nullable>enable</Nullable> | ||
| </PropertyGroup> | ||
|
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| <ItemGroup> | ||
| <PackageReference Include="Microsoft.Extensions.Hosting" Version="8.0.0" /> | ||
| </ItemGroup> | ||
|
|
||
| </Project> |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,9 @@ | ||
| using Microsoft.Extensions.Configuration; | ||
| using Microsoft.Extensions.Hosting; | ||
|
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| var host = Host.CreateDefaultBuilder(args) | ||
| .ConfigureAppConfiguration(ctx => ctx.AddJsonFile("appsettings.json")) | ||
| .ConfigureServices(services => { }) | ||
| .Build(); | ||
|
|
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| Console.WriteLine(); |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,16 @@ | ||
| namespace DesignPatterns.Singleton; | ||
|
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| public class SingletonWithLazy | ||
| { | ||
| private static readonly Lazy<SingletonWithLazy> instance = new(() => new SingletonWithLazy()); | ||
|
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| /// <summary> | ||
| /// The private constructor is declared to prevent instantiation directly, via calling a default constructor. | ||
| /// </summary> | ||
| private SingletonWithLazy() | ||
| { | ||
| Console.WriteLine($"An instance of {nameof(SingletonWithLazy)} has been created."); | ||
| } | ||
|
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| public static SingletonWithLazy Instance => instance.Value; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,28 @@ | ||
| namespace DesignPatterns.Singleton; | ||
|
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| public class SingletonWithLock | ||
| { | ||
| private static SingletonWithLock? instance = null; | ||
| private static readonly object lockObj = new(); | ||
|
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| /// <summary> | ||
| /// The private constructor is declared to prevent instantiation directly, via calling a default constructor. | ||
| /// </summary> | ||
| private SingletonWithLock() | ||
| { | ||
| Console.WriteLine($"An instance of {nameof(SingletonWithLock)} has been created."); | ||
| } | ||
|
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| public static SingletonWithLock Instance | ||
| { | ||
| get | ||
| { | ||
| // The cost of executing the lock operation is significantly higher | ||
| // in comparison to the straightforward pointer check `instance != null`. | ||
| lock (lockObj) | ||
| { | ||
| return instance ??= new SingletonWithLock(); | ||
| } | ||
| } | ||
| } | ||
| } |
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