Flyweight pattern example

Author: anupavanm

DesignPatterns.sln

@@ -23,6 +23,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "FacadePattern", "FacadePatt
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DecoratorPattern", "DecoratorPattern\DecoratorPattern.csproj", "{E16867D5-A235-437D-ADBF-8A4418E7038B}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "FlyweightPattern", "FlyweightPattern\FlyweightPattern.csproj", "{FB1E171E-9C39-4EF1-9377-9786AF3C61DA}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -69,6 +71,10 @@ Global
 		{E16867D5-A235-437D-ADBF-8A4418E7038B}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{E16867D5-A235-437D-ADBF-8A4418E7038B}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{E16867D5-A235-437D-ADBF-8A4418E7038B}.Release|Any CPU.Build.0 = Release|Any CPU
+		{FB1E171E-9C39-4EF1-9377-9786AF3C61DA}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{FB1E171E-9C39-4EF1-9377-9786AF3C61DA}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{FB1E171E-9C39-4EF1-9377-9786AF3C61DA}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{FB1E171E-9C39-4EF1-9377-9786AF3C61DA}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

FlyweightPattern/FlyweightPattern.csproj

@@ -0,0 +1,8 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp2.0</TargetFramework>
+  </PropertyGroup>
+
+</Project>

FlyweightPattern/Program.cs

@@ -0,0 +1,66 @@
+using System;
+using System.Collections.Generic;
+
+namespace FlyweightPattern
+{
+  class Program
+  {
+    // Anything that will be cached is flyweight.
+    // Types of tea here will be flyweights.
+    class KarakTea
+    {
+    }
+
+    // Acts as a factory and saves the tea
+    class TeaMaker
+    {
+      private Dictionary<string, KarakTea> mAvailableTea = new Dictionary<string, KarakTea>();
+
+      public KarakTea Make(string preference)
+      {
+        if (!mAvailableTea.ContainsKey(preference))
+        {
+          mAvailableTea[preference] = new KarakTea();
+        }
+
+        return mAvailableTea[preference];
+      }
+    }
+
+    class TeaShop
+    {
+      private Dictionary<int, KarakTea> mOrders = new Dictionary<int, KarakTea>();
+      private readonly TeaMaker mTeaMaker;
+
+      public TeaShop(TeaMaker teaMaker)
+      {
+        mTeaMaker = teaMaker ?? throw new ArgumentNullException("teaMaker", "teaMaker cannot be null");
+      }
+
+      public void TakeOrder(string teaType, int table)
+      {
+        mOrders[table] = mTeaMaker.Make(teaType);
+      }
+
+      public void Serve()
+      {
+        foreach (var table in mOrders.Keys)
+        {
+          Console.WriteLine("Serving Tea to table # {0}", table);
+        }
+      }
+    }
+    static void Main(string[] args)
+    {
+      var teaMaker = new TeaMaker();
+      var teaShop = new TeaShop(teaMaker);
+
+      teaShop.TakeOrder("less sugar", 1);
+      teaShop.TakeOrder("more milk", 2);
+      teaShop.TakeOrder("without sugar", 5);
+
+      teaShop.Serve();
+      Console.ReadLine();
+    }
+  }
+}