BlazorFluentUIPractice/BlazorFluentUI/Services/CountryService.cs

using BlazorFluentUI.Models;

namespace BlazorFluentUI.Services
{
    public class CountryService
    {
        private readonly List<Country> _countries = new List<Country>();
        private readonly SemaphoreSlim _semaphore = new SemaphoreSlim(1, 1);
        private readonly Random _random = new Random();
        private readonly string[] _countryNames = { "Korea", "USA", "Canada", "Mexico", "Brazil", "UK", "Germany", "France", "Italy", "China", "Japan", "India", "Australia", "Russia", "Spain", "South Africa", "New Zealand", "Argentina", "Egypt", "Thailand", "Sweden", "Norway", "Denmark", "Finland", "Netherlands", "Belgium" };

        public CountryService()
        {
            var randomCountryNames = _countryNames.OrderBy(x => Guid.NewGuid()).ToArray();

            for (int i = 0; i < randomCountryNames.Length; i++)
            {
                var country = new Country
                {
                    Id = i + 1,
                    Name = randomCountryNames[i],
                };
                _countries.Add(country);
            }
        }

        public async Task<Country> GetCountryAsync(int id)
        {
            await _semaphore.WaitAsync();
            try
            {
                return _countries.FirstOrDefault(c => c.Id == id);
            }
            finally
            {
                _semaphore.Release();
            }
        }

        public async Task<IEnumerable<Country>> GetAllCountriesAsync()
        {
            await _semaphore.WaitAsync();
            try
            {
                return _countries.ToList();
            }
            finally
            {
                _semaphore.Release();
            }
        }

        //public async Task GenerateRandomCountriesAsync(int count)
        //{
        //    await _semaphore.WaitAsync();
        //    try
        //    {
        //        for (int i = 0; i < count; i++)
        //        {
        //            var country = new Country
        //            {
        //                Id = _countries.Any() ? _countries.Max(c => c.Id) + 1 : 1,
        //                Name = _countryNames[_random.Next(_countryNames.Length)],
        //            };
        //            _countries.Add(country);
        //        }
        //    }
        //    finally
        //    {
        //        _semaphore.Release();
        //    }
        //}
    }
}