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Singleton as StaticInit and ThreadSafe
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-109
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12 files changed

+105
-109
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‎CreationalPatterns/CreationalPatterns.csproj‎

Lines changed: 5 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -45,15 +45,19 @@
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<ItemGroup>
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<Compile Include="Program.cs" />
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<Compile Include="Properties\AssemblyInfo.cs" />
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<Compile Include="Singleton\ChocolateBoiler_StaticInit.cs" />
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<Compile Include="Singleton\ChocolateBoiler.cs" />
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</ItemGroup>
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<ItemGroup>
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<None Include="App.config" />
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<None Include="Singleton\Singleton.cd" />
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<None Include="doc\Singleton.cd" />
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</ItemGroup>
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<ItemGroup>
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<Folder Include="AbstractFactory\" />
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</ItemGroup>
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<ItemGroup>
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<Content Include="doc\Singleton.png" />
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</ItemGroup>
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<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
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<!-- To modify your build process, add your task inside one of the targets below and uncomment it.
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Other similar extension points exist, see Microsoft.Common.targets.

CreationalPatterns/Singleton/ChocolateBoiler.cs renamed to CreationalPatterns/Singleton/ChocolateBoiler_StaticInit.cs

Lines changed: 6 additions & 10 deletions
Original file line numberDiff line numberDiff line change
@@ -6,28 +6,24 @@
66

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namespace CreationalPatterns.Singleton
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{
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class ChocolateBoiler
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public sealed class ChocolateBoiler_StaticInit
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{
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public bool Empty { get; set; }
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public bool Boiled { get; set; }
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// singleton instance
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private static ChocolateBoiler instance;
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private static readonly ChocolateBoiler_StaticInit instance = new ChocolateBoiler_StaticInit();
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private ChocolateBoiler()
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private ChocolateBoiler_StaticInit()
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{
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this.Empty = true;
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this.Boiled = false;
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}
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public static ChocolateBoiler Instance
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public static ChocolateBoiler_StaticInit Instance
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{
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get
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{
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if(instance == null)
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{
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instance = new ChocolateBoiler();
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}
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return instance;
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}
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}
@@ -48,7 +44,7 @@ public void Drain()
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{
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// To drain the boiler, it must be full and also boiled.
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// Once it is drained we set the Empty property back to true
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if(!this.Empty && this.Boiled)
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if (!this.Empty && this.Boiled)
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{
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// drain the boiled milk and chocolate
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this.Empty = true;
@@ -59,7 +55,7 @@ public void Boil()
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{
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// To boil the mixture, the boiler has to be full and not already boiled.
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// Once it is boiled we set the boiled flag to true
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if(!this.Empty && !this.Boiled)
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if (!this.Empty && !this.Boiled)
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{
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// bring the contents to a boil
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this.Boiled = true;

‎CreationalPatterns/Singleton/ChocolateBoiler_ThreadSafe.cs‎

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,76 @@
1+
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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7+
namespace CreationalPatterns.Singleton
8+
{
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public sealed class ChocolateBuilder_ThreadSafe
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{
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public bool Empty { get; set; }
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public bool Boiled { get; set; }
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// singleton instance
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private static volatile ChocolateBuilder_ThreadSafe instance;
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private static object syncLock = new object();
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private ChocolateBuilder_ThreadSafe()
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{
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this.Empty = true;
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this.Boiled = false;
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}
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public static ChocolateBuilder_ThreadSafe Instance
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{
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get
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{
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if (instance == null)
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{
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lock (syncLock)
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{
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if(instance == null)
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{
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instance = new ChocolateBuilder_ThreadSafe();
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}
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}
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}
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return instance;
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}
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}
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public void Fill()
43+
{
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// To fill the boiler, it must be empty, and once it's full, we set the empty and boiled flags
45+
if (this.Empty)
46+
{
47+
this.Empty = false;
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this.Boiled = false;
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// fill the boiler with a milk/chocolate mixture
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}
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}
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54+
public void Drain()
55+
{
56+
// To drain the boiler, it must be full and also boiled.
57+
// Once it is drained we set the Empty property back to true
58+
if (!this.Empty && this.Boiled)
59+
{
60+
// drain the boiled milk and chocolate
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this.Empty = true;
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}
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}
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65+
public void Boil()
66+
{
67+
// To boil the mixture, the boiler has to be full and not already boiled.
68+
// Once it is boiled we set the boiled flag to true
69+
if (!this.Empty && !this.Boiled)
70+
{
71+
// bring the contents to a boil
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this.Boiled = true;
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}
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}
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}
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}

‎CreationalPatterns/Singleton/README.md‎

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Original file line numberDiff line numberDiff line change
@@ -1,3 +1,10 @@
11
# Singleton
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![ChocolateBoiler as Singleton](/CreationalPatterns/doc/Singleton.png)
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## Static Initialization
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If your applicatioin always creates and uses an instance of the `Singleton` or the overhead of creation and runtime aspects of the Singleton are not onerous, you may want to create your Singleton eagerly, like `ChocolateBoiler_StaticInit.cs`.
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9+
The class is marked as **sealed** to prevent derivation, which could add instances. In addition, the variable is marked **readonly**, which means that it can be assigned only during static Initialization or in a class constructor.
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‎CreationalPatterns/doc/Singleton.cd‎

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@@ -1,10 +1,18 @@
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<?xml version="1.0" encoding="utf-8"?>
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<ClassDiagram MajorVersion="1" MinorVersion="1" MembersFormat="NameAndType">
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<Class Name="CreationalPatterns.Singleton.ChocolateBoiler">
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<Position X="3.5" Y="1" Width="2" />
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<Class Name="CreationalPatterns.Singleton.ChocolateBoiler_StaticInit">
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<Position X="2.75" Y="1" Width="2.75" />
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<TypeIdentifier>
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<HashCode>IAAAAAAAAAAAAAAgAAJAAAAAAABACAAAQAAAAAAAAAA=</HashCode>
7-
<FileName>Singleton\ChocolateBoiler.cs</FileName>
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<FileName>Singleton\ChocolateBoiler_StaticInit.cs</FileName>
8+
<NewMemberFileName>Singleton\ChocolateBoiler.cs</NewMemberFileName>
9+
</TypeIdentifier>
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</Class>
11+
<Class Name="CreationalPatterns.Singleton.ChocolateBuilder_ThreadSafe">
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<Position X="6" Y="1" Width="2.75" />
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<TypeIdentifier>
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<HashCode>IAAAAAAAAAAAAAAgAAJAAAgAAABACAAAQAAAAAAAAAA=</HashCode>
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<FileName>Singleton\ChocolateBoiler_ThreadSafe.cs</FileName>
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</TypeIdentifier>
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</Class>
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<Font Name="Segoe UI" Size="9" />

‎CreationalPatterns/doc/Singleton.png‎

15.4 KB
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‎DesignPatterns.sln‎

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Original file line numberDiff line numberDiff line change
@@ -10,15 +10,6 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution
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README.md = README.md
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EndProjectSection
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EndProject
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Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "doc", "doc", "{5F946B5C-E2E4-4740-B8C9-8EAC24BCFA38}"
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EndProject
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Project("{F088123C-0E9E-452A-89E6-6BA2F21D5CAC}") = "Diagrams", "Diagrams\Diagrams.modelproj", "{65DF9949-9385-4C80-A529-54EB58F9F1D7}"
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EndProject
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Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "CreationalPatterns", "CreationalPatterns", "{4C621B54-9BDF-4842-91DA-45DC95063B9C}"
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ProjectSection(SolutionItems) = preProject
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CreationalPatterns\Singleton.cd = CreationalPatterns\Singleton.cd
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EndProjectSection
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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{32536589-DE08-4C37-962F-2C92136B239E}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{32536589-DE08-4C37-962F-2C92136B239E}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{32536589-DE08-4C37-962F-2C92136B239E}.Release|Any CPU.Build.0 = Release|Any CPU
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{65DF9949-9385-4C80-A529-54EB58F9F1D7}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{65DF9949-9385-4C80-A529-54EB58F9F1D7}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{65DF9949-9385-4C80-A529-54EB58F9F1D7}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{65DF9949-9385-4C80-A529-54EB58F9F1D7}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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EndGlobalSection
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GlobalSection(NestedProjects) = preSolution
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{4C621B54-9BDF-4842-91DA-45DC95063B9C} = {5F946B5C-E2E4-4740-B8C9-8EAC24BCFA38}
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EndGlobalSection
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EndGlobal

‎Diagrams/CreationalPatterns.classdiagram‎

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‎Diagrams/CreationalPatterns.classdiagram.layout‎

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‎Diagrams/CreationalPatterns/ClassDiagram1.png‎

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