using System;

using Microsoft.Extensions.ObjectPool;

​

namespace ConsoleApp1

{

    class Program

    {

        static void Main(string[] args)

        {

            var poolProvider = new DefaultObjectPoolProvider { MaximumRetained = 2 };

            ObjectPool<Channel> pool = poolProvider.Create(new ChannelPooledObjectPolicy());

​

            var connection0 = pool.Get();

            var connection1 = pool.Get();

            var connection2 = pool.Get();

            pool.Return(connection0);

            pool.Return(connection1);

            // dispose after return, max retained is 2

            pool.Return(connection2);

            // reuse the connection

            var connection3 = pool.Get();

        }

    }

    public class ChannelPooledObjectPolicy : IPooledObjectPolicy<Channel> 

    {

        public Channel Create()

        {

            return new Channel();

        }

​

        public bool Return(Channel obj)

        {

            return true;

        }   

    }

​

    public class Channel : IDisposable

    {

        private static int instanceId = 0;

​

        public int InstanceId { get; } = instanceId++;

​

        public Channel()

        {

            Console.WriteLine($"Instance {this.InstanceId} created");

        }

​

        public void Dispose()

        {

            Console.WriteLine($"Instance {this.InstanceId} disposed");

        }

    }

}