RedisConnectionHelp

using StackExchange.Redis;
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Configuration;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace RedisCharpClient {
    class RedisConnectionHelp {
        //系统自定义Key前缀
        public static readonly string SysCustomKey = ConfigurationManager.AppSettings["redisKey"] ?? "";
        //"127.0.0.1:6379,allowadmin=true
        private static readonly string RedisConnectionString = ConfigurationManager.ConnectionStrings["RedisExchangeHosts"].ConnectionString;
        private static readonly object Locker = new object();
        private static ConnectionMultiplexer _instance;
        private static readonly ConcurrentDictionary<string, ConnectionMultiplexer> ConnectionCache = new ConcurrentDictionary<string, ConnectionMultiplexer>();

        /// <summary>
        /// 单例获取
        /// </summary>
        public static ConnectionMultiplexer Instance {
            get {
                if (_instance == null) {
                    lock (Locker) {
                        if (_instance == null || !_instance.IsConnected) {
                            _instance = GetManager();
                        }
                    }
                }
                return _instance;
            }
        }

        /// <summary>
        /// 缓存获取
        /// </summary>
        public static ConnectionMultiplexer GetConnectionMultiplexer(string connectionString) {
            if (!ConnectionCache.ContainsKey(connectionString)) {
                ConnectionCache[connectionString] = GetManager(connectionString);
            }
            return ConnectionCache[connectionString];
        }

        /// <summary>
        /// 
        /// </summary>
        private static ConnectionMultiplexer GetManager(string connectionString = null) {
            connectionString = connectionString ?? RedisConnectionString;
            var connect = ConnectionMultiplexer.Connect(connectionString);

            //注册如下事件
            connect.ConnectionFailed += MuxerConnectionFailed;
            connect.ConnectionRestored += MuxerConnectionRestored;
            connect.ErrorMessage += MuxerErrorMessage;
            connect.ConfigurationChanged += MuxerConfigurationChanged;
            connect.HashSlotMoved += MuxerHashSlotMoved;
            connect.InternalError += MuxerInternalError;

            return connect;
        }

        #region 事件
        /// <summary>
        /// 配置更改时
        /// </summary>
        private static void MuxerConfigurationChanged(object sender, EndPointEventArgs e) {
            Console.WriteLine("Configuration changed: " + e.EndPoint);
        }

        /// <summary>
        /// 发生错误时
        /// </summary>
        private static void MuxerErrorMessage(object sender, RedisErrorEventArgs e) {
            Console.WriteLine("ErrorMessage: " + e.Message);
        }

        /// <summary>
        /// 重新建立连接之前的错误
        /// </summary>
        private static void MuxerConnectionRestored(object sender, ConnectionFailedEventArgs e) {
            Console.WriteLine("ConnectionRestored: " + e.EndPoint);
        }

        /// <summary>
        /// 连接失败，如果重新连接成功你将不会收到这个通知
        /// </summary>
        private static void MuxerConnectionFailed(object sender, ConnectionFailedEventArgs e) {
            Console.WriteLine("重新连接：Endpoint failed: " + e.EndPoint + ", " + e.FailureType + (e.Exception == null ? "" : (", " + e.Exception.Message)));
        }

        /// <summary>
        /// 更改集群
        /// </summary>
        private static void MuxerHashSlotMoved(object sender, HashSlotMovedEventArgs e) {
            Console.WriteLine("HashSlotMoved:NewEndPoint" + e.NewEndPoint + ", OldEndPoint" + e.OldEndPoint);
        }

        /// <summary>
        /// redis类库错误
        /// </summary>
        private static void MuxerInternalError(object sender, InternalErrorEventArgs e) {
            Console.WriteLine("InternalError:Message" + e.Exception.Message);
        }
        #endregion 事件
    }
}