magman/MagMan.Data.Tenant/Services/BaseServ.cs

using MagMan.Core;
using Microsoft.Extensions.Configuration;
using NLog;
using NLog.Fluent;
using StackExchange.Redis;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace MagMan.Data.Tenant.Services
{
    /// <summary>
    /// Classe di partenza x costruzione servizi di accesso dati + cache
    /// </summary>
    public class BaseServ
    {
        #region Protected Fields

        protected static Logger Log = LogManager.GetCurrentClassLogger();
        protected IConfiguration _configuration = null!;

        /// <summary>
        /// Durata cache lunga IN SECONDI
        /// </summary>
        protected int cacheTtlLong = 60 * 5;

        /// <summary>
        /// Durata cache breve IN SECONDI
        /// </summary>
        protected int cacheTtlShort = 60 * 1;

        /// <summary>
        /// Oggetto per connessione a REDIS
        /// </summary>
        protected IConnectionMultiplexer redisConn = null!;

        /// <summary>
        /// Oggetto DB redis da impiegare x chiamate R/W
        /// </summary>
        protected IDatabase redisDb = null!;

        protected Random rnd = new Random();

        #endregion Protected Fields

        #region Protected Properties

        /// <summary>
        /// Durata cache breve (1 min circa + perturbazione percentuale +/-10%)
        /// </summary>
        protected TimeSpan FastCache
        {
            get => TimeSpan.FromSeconds(cacheTtlShort * rnd.Next(900, 1100) / 1000);
        }

        /// <summary>
        /// Durata cache lunga (+ perturbazione percentuale +/-10%)
        /// </summary>
        protected TimeSpan LongCache
        {
            get => TimeSpan.FromSeconds(cacheTtlLong * rnd.Next(900, 1100) / 1000);
        }

        /// <summary>
        /// Durata cache MOLTO breve (10 sec circa + perturbazione percentuale +/-10%)
        /// </summary>
        protected TimeSpan UltraFastCache
        {
            get => TimeSpan.FromSeconds(cacheTtlShort / 6 * rnd.Next(900, 1100) / 1000);
        }

        /// <summary>
        /// Durata cache MOLTO lunga (+ perturbazione percentuale +/-10%)
        /// </summary>
        protected TimeSpan UltraLongCache
        {
            get => TimeSpan.FromSeconds(cacheTtlLong * 10 * rnd.Next(900, 1100) / 1000);
        }

        #endregion Protected Properties

        #region Protected Methods

        /// <summary>
        /// Esegue flush memoria redis dato pattern
        /// </summary>
        /// <param name="pattern"></param>
        /// <returns></returns>
        protected async Task<bool> ExecFlushRedisPattern(RedisValue pattern)
        {
            bool answ = false;
            var listEndpoints = redisConn.GetEndPoints();
            foreach (var endPoint in listEndpoints)
            {
                //var server = redisConnAdmin.GetServer(listEndpoints[0]);
                var server = redisConn.GetServer(endPoint);
                if (server != null)
                {
                    var keyList = server.Keys(redisDb.Database, pattern);
                    foreach (var item in keyList)
                    {
                        await redisDb.KeyDeleteAsync(item);
                    }
                    answ = true;
                }
            }

            return answ;
        }

        /// <summary>
        /// Refresh globale cache redis
        /// </summary>
        /// <returns></returns>
        protected async Task<bool> FlushRedisCache()
        {
            Stopwatch stopWatch = new Stopwatch();
            stopWatch.Start();
            await Task.Delay(1);
            RedisValue pattern = new RedisValue($"{Const.rKeyConfig}:*");
            bool answ = await ExecFlushRedisPattern(pattern);
            stopWatch.Stop();
            Log.Debug($"FlushRedisCache in {stopWatch.Elapsed.TotalMilliseconds} ms");
            return answ;
        }

        #endregion Protected Methods
    }
}