DesignPatterns/StructurePattern/FlyweightPattern/Prototype.cs at main · WeihanLi/DesignPatterns · GitHub

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using System.Collections.Concurrent;

namespace FlyweightPattern;

internal abstract class Flyweight
{
    public abstract void Operation(int extrinsicstate);
}

internal class ConcreteFlyweight : Flyweight
{
    public override void Operation(int extrinsicstate)
    {
        Console.WriteLine("operation in ConcreteFlyweight");
    }
}

internal class UnsharedFlyweight : Flyweight
{
    public override void Operation(int extrinsicstate)
    {
        Console.WriteLine("operation in UnsharedFlyweight");
    }
}

internal class FlyWeightFactory
{
    private readonly ConcurrentDictionary<string, Flyweight> _flyweights = new();

    public Flyweight GetFlyweight(string name) => _flyweights.GetOrAdd(name, n => new ConcreteFlyweight());
}