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Abhishek Kumar Singh
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Singleton and Adapter
1 parent 07c6b4d commit cbbc92e

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10 files changed

+146
-96
lines changed

10 files changed

+146
-96
lines changed

‎.gitignore‎

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*.vscode/
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*vscode/
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*bin/
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*obj/
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*.out/
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*.vs/
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*out/
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*vs/

‎Adapter.cs‎

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This file was deleted.

‎Adapter/Adapter.cs‎

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namespace DesignPatterns.Adapter
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{
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// 3. Adapter - makes ThirdPartyLogger fit IMyLogger interface
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internal class Adapter : IMyLogger
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{
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private readonly ThirdPartyLogger _thirdpartylogger;
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public Adapter(ThirdPartyLogger thirdpartylogger)
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{
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_thirdpartylogger = thirdpartylogger;
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}
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public void LogInfo(string msg)
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{
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// Will write some logic to make MyLogger,cs compatible with ThirdPartLogger.cs
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_thirdpartylogger.WriteLog("Success",msg);
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}
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public void LogError(string msg)
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{
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// Will write some logic to make MyLogger,cs compatible with ThirdPartLogger.cs
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_thirdpartylogger.WriteLog("Error", msg);
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}
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}
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}

‎Adapter/MyLogger.cs‎

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using System;
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namespace DesignPatterns.Adapter
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{
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// 1. Target interface - What your app expects
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interface IMyLogger
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{
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void LogInfo(string msg);
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void LogError(string msg);
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}
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internal class MyLogger : IMyLogger
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{
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public void LogInfo(string msg)
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{
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Console.WriteLine("Info - Log");
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}
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public void LogError(string msg)
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{
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Console.WriteLine("Error - Log");
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}
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}
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}

‎Adapter/Program.cs‎

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using System;
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namespace DesignPatterns.Adapter
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{
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internal class Program
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{
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static void Main(string[] args)
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{
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IMyLogger myLogger = new Adapter(new ThirdPartyLogger());
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// Behind the scenes, Adapter redirects to ThirdPartyLogger.WriteLog()
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myLogger.LogInfo("This is success msg");
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myLogger.LogError("This is error msg");
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}
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}
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}

‎Adapter/ThirdPartyLogger.cs‎

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using System;
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namespace DesignPatterns.Adapter
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{
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// 2. Adaptee (3rd party NuGet package class - cannot be modified!)
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internal class ThirdPartyLogger
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{
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public void WriteLog(string severity, string msg)
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{
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Console.WriteLine("[{0}] - {1}", severity, msg);
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}
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}
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}

‎DesignPatterns.csproj‎

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<ErrorReport>prompt</ErrorReport>
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<WarningLevel>4</WarningLevel>
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</PropertyGroup>
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<PropertyGroup>
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<StartupObject>DesignPatterns.Adapter.Program</StartupObject>
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</PropertyGroup>
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<ItemGroup>
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<Reference Include="System" />
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<Reference Include="System.Core" />
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<Reference Include="System.Drawing" />
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<Reference Include="System.Windows.Forms" />
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<Reference Include="System.Xml.Linq" />
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<Reference Include="System.Data.DataSetExtensions" />
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<Reference Include="Microsoft.CSharp" />
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</ItemGroup>
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<ItemGroup>
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<Compile Include="AbstractFactory.cs" />
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<Compile Include="Adapter.cs" />
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<Compile Include="Adapter\Adapter.cs" />
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<Compile Include="Adapter\MyLogger.cs" />
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<Compile Include="Adapter\Program.cs" />
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<Compile Include="Adapter\ThirdPartyLogger.cs" />
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<Compile Include="Factory.cs" />
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<Compile Include="Program.cs" />
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<Compile Include="Properties\AssemblyInfo.cs" />
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<Compile Include="Singleton.cs" />
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<Compile Include="Singleton\Program.cs" />
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<Compile Include="Singleton\Singleton.cs" />
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</ItemGroup>
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<ItemGroup>
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<None Include="App.config" />

‎Program.cs‎

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//using DesignPatterns;
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using DesignPatterns.AdapterPattern;
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//using DesignPatterns.Factory;
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using System;
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// using DesignPatterns.AbstractFactory;
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////using DesignPatterns;
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//using DesignPatterns.AdapterPattern;
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////using DesignPatterns.Factory;
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//using System;
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//// using DesignPatterns.AbstractFactory;
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namespace DesignPatterns
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{
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internal class Program
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{
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static void Main(string[] args)
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{
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// Singleton
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//Singleton singleton = Singleton.GetInstance();
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//namespace DesignPatterns
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//{
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// internal class Program
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// {
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// static void Main(string[] args)
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// {
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// // Singleton
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// //Singleton singleton = Singleton.GetInstance();
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// Consumer or Client
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// // Consumer or Client
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// Factory Pattern
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//Waiter waiter = new Waiter();
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//Console.WriteLine(waiter.GetPizza("Veg"));
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// // Factory Pattern
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// //Waiter waiter = new Waiter();
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// //Console.WriteLine(waiter.GetPizza("Veg"));
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// Abstract Factory Pattern
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//Waiter waiter = new Waiter("Veg");
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//Console.WriteLine(waiter.GetPrizza());
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//Console.WriteLine(waiter.GetBurger());
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// // Abstract Factory Pattern
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// //Waiter waiter = new Waiter("Veg");
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// //Console.WriteLine(waiter.GetPrizza());
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// //Console.WriteLine(waiter.GetBurger());
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// Adapter Design Patter
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// 4. Client - your application
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// Normally, client code depends only on ILogger
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ILogger logger = new LoggerAdapter(new ThirdPartyLogger());
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// Behind the scenes, Adapter redirects to ThirdPartyLogger.WriteLog()
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logger.LogInfo("Behind the scenes, calling WriteLog() from ThirdPartyLogger.");
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}
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}
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}
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// }
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// }
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//}

‎Singleton/Program.cs‎

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using System;
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namespace DesignPatterns.Singleton
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{
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internal class Program
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{
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static void Main(string[] args)
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{
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Singleton s1 = Singleton.GetInstance();
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Singleton s2 = Singleton.GetInstance();
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// Check if both references point to the same object
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if (ReferenceEquals(s1, s2))
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{
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Console.WriteLine("Both objects are the same instance.");
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}
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else
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{
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Console.WriteLine("Different instances created!");
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}
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}
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}
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}

Singleton.cs renamed to Singleton/Singleton.cs

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namespace DesignPatterns
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namespace DesignPatterns.Singleton
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{
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class Singleton
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/// <summary>
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/// The Singleton class ensures that only one instance of the class is created and provides a global point of access to that instance.
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/// Key Points:
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/// - Private constructor to prevent instantiation from outside this class.
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/// - A static field to store the single instance.
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/// - Thread-safety ensured using 'lock' (double-checked locking).
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/// - Lazy initialization: instance is created only when first accessed.
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/// </summary>
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internal class Singleton
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{
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/// <summary>
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/// The Singleton class ensures that only one instance of the class is created
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/// and provides a global point of access to that instance.
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///
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/// Key Points:
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/// - Private constructor to prevent instantiation from outside this class.
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/// - A static field to store the single instance.
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/// - Thread-safety ensured using 'lock' (double-checked locking).
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/// - Lazy initialization: instance is created only when first accessed.
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/// </summary>
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///
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private Singleton() { }
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// Holds the single instance of the Singleton class.

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