RedisHelper Redis帮助类
2024-10-20 16:33:22
using StackExchange.Redis;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Runtime.Serialization.Formatters.Binary;
using System.Text;
using System.Threading.Tasks; namespace WindowsFormsApplication1
{
public static class RedisHelper
{
private static string Constr = ""; private static object _locker = new Object();
private static ConnectionMultiplexer _instance = null; /// <summary>
/// 使用一个静态属性来返回已连接的实例，如下列中所示。这样，一旦 ConnectionMultiplexer 断开连接，便可以初始化新的连接实例。
/// </summary>
public static ConnectionMultiplexer Instance
{
get
{
if (Constr.Length == )
{
throw new Exception("连接字符串未设置！");
}
if (_instance == null)
{
lock (_locker)
{
if (_instance == null || !_instance.IsConnected)
{
_instance = ConnectionMultiplexer.Connect(Constr);
}
}
}
//注册如下事件
_instance.ConnectionFailed += MuxerConnectionFailed;
_instance.ConnectionRestored += MuxerConnectionRestored;
_instance.ErrorMessage += MuxerErrorMessage;
_instance.ConfigurationChanged += MuxerConfigurationChanged;
_instance.HashSlotMoved += MuxerHashSlotMoved;
_instance.InternalError += MuxerInternalError;
return _instance;
}
} static RedisHelper()
{
} public static void SetCon(string config)
{
Constr = config;
} /// <summary>
///
/// </summary>
/// <returns></returns>
public static IDatabase GetDatabase()
{
return Instance.GetDatabase();
} /// <summary>
/// 这里的 MergeKey 用来拼接 Key 的前缀，具体不同的业务模块使用不同的前缀。
/// </summary>
/// <param name="key"></param>
/// <returns></returns>
private static string MergeKey(string key)
{
return key;
//return BaseSystemInfo.SystemCode + key;
} /// <summary>
/// 根据key获取缓存对象
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="key"></param>
/// <returns></returns>
public static T Get<T>(string key)
{
key = MergeKey(key);
return Deserialize<T>(GetDatabase().StringGet(key));
} /// <summary>
/// 根据key获取缓存对象
/// </summary>
/// <param name="key"></param>
/// <returns></returns>
public static object Get(string key)
{
key = MergeKey(key);
return Deserialize<object>(GetDatabase().StringGet(key));
} /// <summary>
/// 设置缓存
/// </summary>
/// <param name="key"></param>
/// <param name="value"></param>
/// <param name="expireMinutes"></param>
public static void Set(string key, object value, int expireMinutes = )
{
key = MergeKey(key);
if (expireMinutes > )
{
GetDatabase().StringSet(key, Serialize(value), TimeSpan.FromMinutes(expireMinutes));
}
else
{
GetDatabase().StringSet(key, Serialize(value));
} } /// <summary>
/// 判断在缓存中是否存在该key的缓存数据
/// </summary>
/// <param name="key"></param>
/// <returns></returns>
public static bool Exists(string key)
{
key = MergeKey(key);
return GetDatabase().KeyExists(key); //可直接调用
} /// <summary>
/// 移除指定key的缓存
/// </summary>
/// <param name="key"></param>
/// <returns></returns>
public static bool Remove(string key)
{
key = MergeKey(key);
return GetDatabase().KeyDelete(key);
} /// <summary>
/// 异步设置
/// </summary>
/// <param name="key"></param>
/// <param name="value"></param>
public static async Task SetAsync(string key, object value)
{
key = MergeKey(key);
await GetDatabase().StringSetAsync(key, Serialize(value));
} /// <summary>
/// 根据key获取缓存对象
/// </summary>
/// <param name="key"></param>
/// <returns></returns>
public static async Task<object> GetAsync(string key)
{
key = MergeKey(key);
object value = await GetDatabase().StringGetAsync(key);
return value;
} /// <summary>
/// 实现递增
/// </summary>
/// <param name="key"></param>
/// <returns></returns>
public static long Increment(string key)
{
key = MergeKey(key);
//三种命令模式
//Sync,同步模式会直接阻塞调用者，但是显然不会阻塞其他线程。
//Async,异步模式直接走的是Task模型。
//Fire - and - Forget,就是发送命令，然后完全不关心最终什么时候完成命令操作。
//即发即弃：通过配置 CommandFlags 来实现即发即弃功能，在该实例中该方法会立即返回，如果是string则返回null 如果是int则返回0.这个操作将会继续在后台运行，一个典型的用法页面计数器的实现：
return GetDatabase().StringIncrement(key, flags: CommandFlags.FireAndForget);
} /// <summary>
/// 实现递减
/// </summary>
/// <param name="key"></param>
/// <param name="value"></param>
/// <returns></returns>
public static long Decrement(string key, string value)
{
key = MergeKey(key);
return GetDatabase().HashDecrement(key, value, flags: CommandFlags.FireAndForget);
} /// <summary>
/// 序列化对象
/// </summary>
/// <param name="o"></param>
/// <returns></returns>
private static byte[] Serialize(object o)
{
if (o == null)
{
return null;
}
BinaryFormatter binaryFormatter = new BinaryFormatter();
using (MemoryStream memoryStream = new MemoryStream())
{
binaryFormatter.Serialize(memoryStream, o);
byte[] objectDataAsStream = memoryStream.ToArray();
return objectDataAsStream;
}
} /// <summary>
/// 反序列化对象
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="stream"></param>
/// <returns></returns>
private static T Deserialize<T>(byte[] stream)
{
if (stream == null)
{
return default(T);
}
BinaryFormatter binaryFormatter = new BinaryFormatter();
using (MemoryStream memoryStream = new MemoryStream(stream))
{
T result = (T)binaryFormatter.Deserialize(memoryStream);
return result;
}
} /// <summary>
/// 配置更改时
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private static void MuxerConfigurationChanged(object sender, EndPointEventArgs e)
{
//LogHelper.SafeLogMessage("Configuration changed: " + e.EndPoint);
} /// <summary>
/// 发生错误时
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private static void MuxerErrorMessage(object sender, RedisErrorEventArgs e)
{
//LogHelper.SafeLogMessage("ErrorMessage: " + e.Message);
} /// <summary>
/// 重新建立连接之前的错误
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private static void MuxerConnectionRestored(object sender, ConnectionFailedEventArgs e)
{
//LogHelper.SafeLogMessage("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>
/// <param name="sender"></param>
/// <param name="e"></param>
private static void MuxerConnectionFailed(object sender, ConnectionFailedEventArgs e)
{
//LogHelper.SafeLogMessage("重新连接：Endpoint failed: " + e.EndPoint + ", " + e.FailureType +(e.Exception == null ? "" : (", " + e.Exception.Message)));
} /// <summary>
/// 更改集群
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private static void MuxerHashSlotMoved(object sender, HashSlotMovedEventArgs e)
{
//LogHelper.SafeLogMessage("HashSlotMoved:NewEndPoint" + e.NewEndPoint + ", OldEndPoint" + e.OldEndPoint);
} /// <summary>
/// redis类库错误
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private static void MuxerInternalError(object sender, InternalErrorEventArgs e)
{
//LogHelper.SafeLogMessage("InternalError:Message" + e.Exception.Message);
} //场景不一样，选择的模式便会不一样，大家可以按照自己系统架构情况合理选择长连接还是Lazy。
//建立连接后，通过调用ConnectionMultiplexer.GetDatabase 方法返回对 Redis Cache 数据库的引用。从 GetDatabase 方法返回的对象是一个轻量级直通对象，不需要进行存储。 /// <summary>
/// 使用的是Lazy，在真正需要连接时创建连接。
/// 延迟加载技术
/// 微软azure中的配置 连接模板
/// </summary>
//private static Lazy<ConnectionMultiplexer> lazyConnection = new Lazy<ConnectionMultiplexer>(() =>
//{
// //var options = ConfigurationOptions.Parse(constr);
// ////options.ClientName = GetAppName(); // only known at runtime
// //options.AllowAdmin = true;
// //return ConnectionMultiplexer.Connect(options);
// ConnectionMultiplexer muxer = ConnectionMultiplexer.Connect(Coonstr);
// muxer.ConnectionFailed += MuxerConnectionFailed;
// muxer.ConnectionRestored += MuxerConnectionRestored;
// muxer.ErrorMessage += MuxerErrorMessage;
// muxer.ConfigurationChanged += MuxerConfigurationChanged;
// muxer.HashSlotMoved += MuxerHashSlotMoved;
// muxer.InternalError += MuxerInternalError;
// return muxer;
//}); #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 /// <summary>
/// 当作消息代理中间件使用
/// 消息组建中,重要的概念便是生产者,消费者,消息中间件。
/// </summary>
/// <param name="channel"></param>
/// <param name="message"></param>
/// <returns></returns>
public static long Publish(string channel, string message)
{
ISubscriber sub = Instance.GetSubscriber();
//return sub.Publish("messages", "hello");
return sub.Publish(channel, message);
} /// <summary>
/// 在消费者端得到该消息并输出
/// </summary>
/// <param name="channelFrom"></param>
/// <returns></returns>
public static void Subscribe(string channelFrom)
{
ISubscriber sub = Instance.GetSubscriber();
sub.Subscribe(channelFrom, (channel, message) =>
{
Console.WriteLine((string)message);
});
} #endregion /// <summary>
/// GetServer方法会接收一个EndPoint类或者一个唯一标识一台服务器的键值对
/// 有时候需要为单个服务器指定特定的命令
/// 使用IServer可以使用所有的shell命令，比如：
/// DateTime lastSave = server.LastSave();
/// ClientInfo[] clients = server.ClientList();
/// 如果报错在连接字符串后加 ,allowAdmin=true;
/// </summary>
/// <returns></returns>
public static IServer GetServer(string host, int port)
{
IServer server = Instance.GetServer(host, port);
return server;
} /// <summary>
/// 获取全部终结点
/// </summary>
/// <returns></returns>
public static EndPoint[] GetEndPoints()
{
EndPoint[] endpoints = Instance.GetEndPoints();
return endpoints;
}
}
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