mqtt/WebMonitor/MqttMsgServer/Tools/RedisCache.cs

using Newtonsoft.Json;
using StackExchange.Redis;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using MqttMsgServer;

namespace MqttMsgServer.Tools
{
    public class RedisHelper: IDisposable
    {
        private readonly string _redisConnectionStr = AppSetting.GetValue("redis");
      
        private IDatabase Db { get; set; }

        private static Object lockObj = new Object();
        //public RedisHelper()
        //{
        //    redis = ConnectionMultiplexer.Connect(RedisConnectionStr);
        //    db = redis.GetDatabase();
        //}

        public static ConnectionMultiplexer Redis { get; private set; }

        static RedisHelper()
        {
            lock (lockObj)
            {
                Instance = new RedisHelper();
            }
        }

        private RedisHelper()
        {
            if (Redis == null)
            {
                Redis = ConnectionMultiplexer.Connect(_redisConnectionStr);
                Db = Redis.GetDatabase();
            }
        }

        public static RedisHelper Instance { get; }

        #region string类型操作
        /// <summary>
        /// set or update the value for string key 
        /// </summary>
        /// <param name="key"></param>
        /// <param name="value"></param>
        /// <returns></returns>
        public bool SetStringValue(string key, string value)
        {
          
            return Db.StringSet(key, value);
        }
        /// <summary>
        /// 保存单个key value
        /// </summary>
        /// <param name="key">Redis Key</param>
        /// <param name="value">保存的值</param>
        /// <param name="expiry">过期时间</param>
        /// <returns></returns>
        public bool SetStringKey(string key, string value, TimeSpan? expiry = default(TimeSpan?))
        {
           
            return Db.StringSet(key, value, expiry);
        }
        /// <summary>
        /// 保存一个对象
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="key"></param>
        /// <param name="obj"></param>
        /// <returns></returns>
        public bool SetStringKey<T>(string key, T obj, TimeSpan? expiry = default(TimeSpan?))
        {
            //LogHelper.LogInfo(this, Marshal.SizeOf(Db));
            string json = JsonConvert.SerializeObject(obj);
            return Db.StringSet(key, json, expiry);
        }
        /// <summary>
        /// 获取一个key的对象
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="key"></param>
        /// <returns></returns>
        public T GetStringKey<T>(string key) where T : class
        {
            var res = Db.StringGet(key);
            if (!res.IsNull)
                return JsonConvert.DeserializeObject<T>(res);
            return null;
        }
        /// <summary>
        /// get the value for string key 
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public string GetStringValue(string key)
        {
            return Db.StringGet(key);
        }

        /// <summary>
        /// Delete the value for string key 
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public bool DeleteStringKey(string key)
        {
            return Db.KeyDelete(key);
        }
        #endregion

        #region 哈希类型操作
        /// <summary>
        /// set or update the HashValue for string key 
        /// </summary>
        /// <param name="key"></param>
        /// <param name="hashkey"></param>
        /// <param name="value"></param>
        /// <returns></returns>
        public bool SetHashValue(string key, string hashkey, string value)
        {
            return Db.HashSet(key, hashkey, value);
        }
        /// <summary>
        /// set or update the HashValue for string key 
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="key"></param>
        /// <param name="hashkey"></param>
        /// <param name="t">defined class</param>
        /// <returns></returns>
        public bool SetHashValue<T>(String key, string hashkey, T t) where T : class
        {
            var json = JsonConvert.SerializeObject(t);
            return Db.HashSet(key, hashkey, json);
        }
        /// <summary>
        /// 保存一个集合
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="key">Redis Key</param>
        /// <param name="list">数据集合</param>
        /// <param name="getModelId"></param>
        public void HashSet<T>(string key, List<T> list, Func<T, string> getModelId)
        {
            List<HashEntry> listHashEntry = new List<HashEntry>();
            foreach (var item in list)
            {
                string json = JsonConvert.SerializeObject(item);
                listHashEntry.Add(new HashEntry(getModelId(item), json));
            }
            Db.HashSet(key, listHashEntry.ToArray());
        }
        /// <summary>
        /// 获取hashkey所有的值
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="key"></param>
        /// <returns></returns>
        //public List<T> HashGetAll<T>(string key) where T : class
        //{
        //    List<T> result = new List<T>();
        //    HashEntry[] arr = db.HashGetAll(key);
        //    foreach (var item in arr)
        //    {
        //        if (!item.Value.IsNullOrEmpty)
        //        {
        //            T t;
        //            if (JsonConvert.DeserializeObject<T>(item.Value, out t))
        //            {
        //                result.Add(t);
        //            }

        //        }
        //    }
        //    return result;
        //    //result =JsonHelper.DeserializeJsonToList<T>(arr.ToString());                        
        //    //return result;
        //}
        /// <summary>
        /// get the HashValue for string key  and hashkey
        /// </summary>
        /// <param name="key">Represents a key that can be stored in redis</param>
        /// <param name="hashkey"></param>
        /// <returns></returns>
        public RedisValue GetHashValue(string key, string hashkey)
        {
            RedisValue result = Db.HashGet(key, hashkey);
            return result;
        }

        /// <summary>
        /// get the HashValue for string key  and hashkey
        /// </summary>
        /// <param name="key">Represents a key that can be stored in redis</param>
        /// <param name="hashkey"></param>
        /// <returns></returns>
        //public T GetHashValue<T>(string key, string hashkey) where T : class
        //{
        //    RedisValue result = db.HashGet(key, hashkey);
        //    if (string.IsNullOrEmpty(result))
        //    {
        //        return null;
        //    }
        //    T t;
        //    if (JsonConvert.DeserializeObject<T>(result, out t))
        //    {
        //        return t;
        //    }
        //    return null;
        //}
        /// <summary>
        /// delete the HashValue for string key  and hashkey
        /// </summary>
        /// <param name="key"></param>
        /// <param name="hashkey"></param>
        /// <returns></returns>
        public bool DeleteHashValue(string key, string hashkey)
        {
            return Db.HashDelete(key, hashkey);
        }
        #endregion

        public void Dispose()
        {
            Redis?.Dispose();
        }
    }
}