iot/projects/Infrastructure/Application/Services/Settings/CachedSettingService.cs

using Infrastructure.Application.Entites.Settings;
using Infrastructure.Data;
using Infrastructure.Extensions;
using Microsoft.Extensions.Caching.Distributed;
using Microsoft.Extensions.DependencyInjection;
using System;
using System.Globalization;
using System.Linq;

namespace Infrastructure.Application.Services.Settings
{
    public class CachedSettingService : ISettingService
    {
        private readonly IServiceProvider _sp;
        private readonly string _keyTemplate = "iot-setting-{0}";

        public CachedSettingService(IServiceProvider sp)
        {
            this._sp = sp;
        }

        public Setting GetSetting(string name)
        {
            var key = string.Format(CultureInfo.InvariantCulture, _keyTemplate, name);
            using var scope = this._sp.CreateScope();
            var cache = scope.ServiceProvider.GetRequiredService<IDistributedCache>();
            var setting = cache.Get<Setting>(key);
            if (setting == null)
            {
                var repo = scope.ServiceProvider.GetRequiredService<IRepository<Setting>>();
                setting = repo.ReadOnlyTable().FirstOrDefault(o => o.Name == name);
                cache.Set(key, setting);
            }
            return setting;
        }

        public void AddSetting(Setting setting)
        {
            using var scope = this._sp.CreateScope();
            var repo = scope.ServiceProvider.GetRequiredService<IRepository<Setting>>();
            repo.Add(setting);
            repo.SaveChanges();
        }

        public void DeleteSetting(Setting setting)
        {
            if (setting is null)
            {
                throw new ArgumentNullException(nameof(setting));
            }
            var key = string.Format(CultureInfo.InvariantCulture, _keyTemplate, setting.Name);
            using var scope = this._sp.CreateScope();
            var repo = scope.ServiceProvider.GetRequiredService<IRepository<Setting>>();
            var entity = repo.Table().FirstOrDefault(o => o.Id == setting.Id);
            repo.Delete(entity);
            repo.SaveChanges();
            var cache = scope.ServiceProvider.GetRequiredService<IDistributedCache>();
            cache.Remove(key);
        }

        public void UpdateSetting(Setting setting)
        {
            if (setting is null)
            {
                throw new ArgumentNullException(nameof(setting));
            }
            var key = string.Format(CultureInfo.InvariantCulture, _keyTemplate, setting.Name);
            using var scope = this._sp.CreateScope();
            var repo = scope.ServiceProvider.GetRequiredService<IRepository<Setting>>();
            var entity = repo.Table().FirstOrDefault(o => o.Id == setting.Id);
            entity.From(setting);
            repo.SaveChanges();
            var cache = scope.ServiceProvider.GetRequiredService<IDistributedCache>();
            cache.Remove(key);
        }

        public string GetValue(string name)
        {
            return this.GetSetting(name)?.Value;
        }
    }
}