C#教程之StackExchange.Redis 二次封装(4)|C#教程

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C#教程之C#教程之StackExchange.Redis 二次封装(4)

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string result = value is string ? value.ToString() : 704 JsonConvert.SerializeObject(value, Formatting.None); 705 return result; 706 } 707 /// <summary> 708 /// 获取指定Key中最大Score值, 709 /// </summary> 710 /// <param name="key">key名称，注意要先添加上Key前缀</param> 711 /// <returns></returns> 712 private static double _GetScore(string key, IDatabase db) 713 { 714 double dValue = 0; 715 var rValue = db.SortedSetRangeByRankWithScores(key, 0, 0, Order.Descending).FirstOrDefault(); 716 dValue = rValue != null ? rValue.Score : 0; 717 return dValue + 1; 718 } 719 720 /// <summary> 721 /// 将值集合转换成RedisValue集合 722 /// </summary> 723 /// <typeparam name="T"></typeparam> 724 /// <param name="redisValues"></param> 725 /// <returns></returns> 726 private static RedisValue[] ConvertRedisValue<T>(params T[] redisValues) => redisValues.Select(o => (RedisValue)ConvertJson<T>(o)).ToArray(); 727 728 /// <summary> 729 /// 将值反系列化成对象集合 730 /// </summary> 731 /// <typeparam name="T"></typeparam> 732 /// <param name="values"></param> 733 /// <returns></returns> 734 public static List<T> ConvetList<T>(RedisValue[] values) 735 { 736 List<T> result = new List<T>(); 737 foreach (var item in values) 738 { 739 var model = ConvertObj<T>(item); 740 result.Add(model); 741 } 742 return result; 743 } 744 745 /// <summary> 746 /// 将值反系列化成对象 747 /// </summary> 748 /// <typeparam name="T"></typeparam> 749 /// <param name="value"></param> 750 /// <returns></returns> 751 public static T ConvertObj<T>(RedisValue value) 752 { 753 return value.IsNullOrEmpty ? default(T) : JsonConvert.DeserializeObject<T>(value); 754 } 755 756 /// <summary> 757 /// 获取几个集合的交叉并集合,并保存到一个新Key中 758 /// </summary> 759 /// <param name="db"></param> 760 /// <param name="operation">Union：并集 Intersect：交集 Difference：差集详见 <see cref="SetOperation"/></param> 761 /// <param name="destination">保存的新Key名称</param> 762 /// <param name="keys">要操作的Key集合</param> 763 /// <returns></returns> 764 private static long _SortedSetCombineAndStore(IDatabase db, SetOperation operation, string destination, params string[] keys) 765 { 766 RedisKey[] keyList = ConvertRedisKeysAddSysCustomKey(keys); 767 var rValue = db.SortedSetCombineAndStore(operation, destination, keyList); 768 return rValue; 769 770 } 771 772 /// <summary> 773 /// 将string类型的Key转换成 <see cref="RedisKey"/> 型的Key，并添加前缀字符串 774 /// </summary> 775 /// <param name="redisKeys"></param> 776 /// <returns></returns> 777 private static RedisKey[] ConvertRedisKeysAddSysCustomKey(params string[] redisKeys) => redisKeys.Select(redisKey => (RedisKey)redisKey).ToArray(); 778 #endregion 779 780 #endregion 781 782 #region 当作消息代理中间件使用一般使用更专业的消息队列来处理这种业务场景 783 /// <summary> 784 /// 当作消息代理中间件使用 785 /// 消息组建中,重要的概念便是生产者,消费者,消息中间件。 786 /// </summary> 787 /// <param name="channel"></param> 788 /// <param name="message"></param> 789 /// <returns></returns> 790 public static long Publish(string channel, string message) 791 { 792 ISubscriber sub = Instance.GetSubscriber(); 793 //return sub.Publish("messages", "hello"); 794 return sub.Publish(channel, message); 795 } 796 797 /// <summary> 798 /// 在消费者端得到该消息并输出 799 /// </summary> 800 /// <param name="channelFrom"></param> 801 /// <returns></returns> 802 public static void Subscribe(string channelFrom) 803 { 804 ISubscriber sub = Instance.GetSubscriber(); 805 sub.Subscribe(channelFrom, (channel, message) => 806 { 807 Console.WriteLine((string)message); 808 }); 809 } 810 #endregion 811 812 #region EventHandler 813 /// <summary> 814 /// 连接失败，如果重新连接成功你将不会收到这个通知 815 /// </summary> 816 /// <param name="sender"></param> 817 /// <param name="e"></param> 818 private static void MuxerConnectionFailed(object sender, ConnectionFailedEventArgs e) 819 { 820 821 } 822 823 /// <summary> 824 /// 重新建立连接之前的错误 825 /// </summary> 826 /// <param name="sender"></param> 827 /// <param name="e"></param> 828 private static void MuxerConnectionRestored(object sender, ConnectionFailedEventArgs e) 829 { 830 831 } 832 833 /// <summary> 834 /// 发生错误时 835 /// </summary> 836 /// <param name="sender"></param> 837 /// <param name="e"></param> 838 private static void MuxerErrorMessage(object sender, RedisErrorEventArgs e) 839 { 840 } 841 842 /// <summary> 843 /// 更改集群 844 /// </summary> 845 /// <param name="sender"></param> 846 /// <param name="e"></param> 847 private static void MuxerHashSlotMoved(object sender, HashSlotMovedEventArgs e) 848 { 849 // LogHelper.WriteInfoLog("HashSlotMoved:NewEndPoint" + e.NewEndPoint + ", OldEndPoint" + e.OldEndPoint); 850 } 851 852 /// <summary> 853 /// redis类库错误 854 /// </summary> 855 /// <param name="sender"></param> 856 /// <param name="e"></param> 857 private static void MuxerInternalError(object sender, InternalErrorEventArgs e) 858 { 859 } 860 #endregion 861 } 862 }

在以上RedisUtils帮助类的基础上封装一次调用：

 /// <summary>
    /// Redis帮助类

    /// </summary>
    public class RedisHelper
    {
        /// <summary>
        /// 缓存失效时长
        /// </summary>
        public const int EXPIRY = 30;

        private static int CheckDbIndex(int dbIndex)
        {
            if (dbIndex > 16 || dbIndex < 0)
            {
                dbIndex = 0;
            }
            return dbIndex;
        }

        /// <summary>
        /// 获取缓存数据
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="dbIndex">Redis数据库索引</param>
        /// <param name="key">Redis键</param>
        /// <param name="fun">从其他地方获取数据源，并缓存到Redis中</param>
        /// <param name="timeout">过期时间，单位：分钟</param>
        /// <returns></returns>
        public static T GetObject<T>(int dbIndex, string key, Func<T> fun, int? timeout = EXPIRY) where T : class
        {
            dbIndex = CheckDbIndex(dbIndex);
            T data = RedisUtils.StringGet<T>(dbIndex, key);
            if (data != null)
            {
                return data;
            }
            if (fun != null)
            {
                data = fun();
            }
            if (data != null)
            {
                TimeSpan? timeSp = null;
                if (timeout != null)
                    timeSp = TimeSpan.FromMinutes(Convert.ToDouble(timeout));
                RedisUtils.StringSet<T>(dbIndex, key, data, timeSp);
            }
            return data;
        }

        /// <summary>
        /// KV
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="dbIndex">库</param>
        /// <param name="key">键</param>
        /// <param name="func">如找不到则从func获取</param>
        /// <param name="timeout">超时时间</param>
        /// <returns></returns>
        public static T GetObject_KV<T>(int dbIndex, string key, Func<T> func, TimeSpan? timeout) where T : class
        {
            T data = RedisUtils.StringGet<T>(dbIndex, key);
            if (data != null)
            {
                return data;
            }
            if (func != null)
            {
                data = func();
            }
            if (data != null)
            {
                RedisUtils.StringSet<T>(dbIndex, key, data, timeout);
            }
            return data;
        }

        /// <summary>
        /// 异步获取缓存数据
        /// </summary>
        /// <typeparam name="T">数据集类型</typeparam>
        /// <param name="dbIndex">数据库</param>
        /// <param name="key">键</param>
        /// <param name="fun">从其他地方获取数据源，并缓存到Redis中</param>
        /// <param name="timeout">过期时间，单位：分钟</param>
        /// <returns></returns>
        public static async Task<T> GetObjectAsync<T>(int dbIndex, string key, Func<T> fun, int timeout = EXPIRY) where T : class
        {
            dbIndex = CheckDbIndex(dbIndex);
            T data = RedisUtils.StringGet<T>(dbIndex, key);
            if (data != null)
            {
                return data;
            }

            if (fun != null)
            {
                data = await Task.Run(() =>
                {
                    return fun();
                });
            }
            if (data != null)
            {
                RedisUtils.StringSet<T>(dbIndex, key, data, TimeSpan.FromMinutes(timeout));
            }
            return data;
        }

        /// <summary>
        /// 异步获取缓存数据
        /// </summary>
        /// <typeparam name="T">数据集类型</typeparam>
        /// <param name="dbIndex">数据库</param>
        /// <param name="key">键</param>
        /// <param name="fun">从其他地方获取数据源，并缓存到Redis中</param>
        /// <param name="timeout">过期时间，单位：分钟</param>
        /// <returns></returns>
        public static async Task<T> GetObjectAsync<T>(int dbIndex, string key, Func<RedisCache<T>> fun, int timeout = EXPIRY) where T : class
        {
            dbIndex = CheckDbIndex(dbIndex);
            RedisCache<T> cache = new RedisCache<T>();
            cache.CacheData = RedisUtils.StringGet<T>(dbIndex, key);
            if (cache.CacheData != null)
            {
                return cache.CacheData;
            }

            var temp = await Task.Run(() =>
            {
                return fun();
            });

            if (temp != null) cache = temp;

            if (cache.UseCache)
            {
                RedisUtils.StringSet<T>(dbIndex, key, cache.CacheData, TimeSpan.FromMinutes(timeout));
            }
            return cache.CacheData;
        }

        /// <summary>
        /// 异步获取数据集合
        /// </summary>
        /// <typeparam name="T">数据集类型</typeparam>
        /// <param name="dbIndex">数据库</param>
        /// <param name="key">键</param>
        /// <param name="fun">从其他地方获取数据源，并缓存到Redis中</param>
        /// <param name="timeout">过期时间，单位：分钟</param>

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C#教程之C#教程之StackExchange.Redis 二次封装(4)