【Redis】集群NetCore实战

  • 2020 年 4 月 11 日
  • 筆記

环境准备

1. Redis集群(Windows集群搭建

启动Redis集群,给每个节点加上Title

start "Redis - 6379" /min redis-server.exe redis.6379.conf  start "Redis - 6380" /min redis-server.exe redis.6380.conf  start "Redis - 6381" /min redis-server.exe redis.6381.conf  start "Redis - 6382" /min redis-server.exe redis.6382.conf  start "Redis - 6383" /min redis-server.exe redis.6383.conf  start "Redis - 6384" /min redis-server.exe redis.6384.conf

2. 安装StackExchange.Redis包

dotnet add package StackExchange.Redis

 

连接Redis

var configString = "127.0.0.1:6379";  var options = ConfigurationOptions.Parse(configString);  options.ReconnectRetryPolicy = new ExponentialRetry(5000);  var client = ConnectionMultiplexer.Connect(options);

这里只需要提供一个节点就能访问整个集群

ConnectionMultiplexer 连接Redis可以使用ConfigurationOptions,或者直接字符串初始化(里面实现也是调用ConfigurationOptions.Parse转换)

这里要说一下是他的重连重试机制,在第一次创建连接的时候,StackExchange.Redis会创建一个心跳检测

internal static IDisposable Create(ConnectionMultiplexer connection)  {      var token = new TimerToken(connection);      var timer = new Timer(Heartbeat, token, MillisecondsPerHeartbeat, MillisecondsPerHeartbeat);      token.SetTimer(timer);      return timer;  }

使用System.Threading.Timer每秒钟检查一次。

StackExchange.Redis 实现两种重试策略,当然我们也可以实现自己的重现策略,实现IReconnectRetryPolicy接口

  •  ExponentialRetry(指数)

   根据指定时间,根据重试次数不断增大随机数范围

  • LinearRetry(线性)

   根据指定时间固定时间间隔重试

常用数据结构操作

字符串(String)操作

 

static void RedisStringOperation(ConnectionMultiplexer client)  {      var db = client.GetDatabase();        //单个Key操作      db.StringSet("Key", "Wilson");      Console.WriteLine($"Get Key : {db.StringGet("Key")}");        db.StringSet("Nums", 1);      db.StringIncrement("Nums");      Console.WriteLine($"Get Nums : {db.StringGet("Nums")}");        db.StringDecrement("Nums");      Console.WriteLine($"Get Nums : {db.StringGet("Nums")}");        //多个Key操作      db.StringSet(new KeyValuePair<RedisKey, RedisValue>[]      {          new KeyValuePair<RedisKey, RedisValue>("{user}Name","Wilson"),          new KeyValuePair<RedisKey, RedisValue>("{user}Age",30)      });        foreach (var value in db.StringGet(new RedisKey[] { "{user}Name", "{user}Age" }))      {          Console.WriteLine($"{value}");      }  }

 

哈希(Hash)操作

 

static void RedisHashOperation(ConnectionMultiplexer client)  {      var db = client.GetDatabase();        db.HashSet("person", "name", "Wilson");      Console.WriteLine(db.HashGet("person", "name"));        db.HashSet("person", new HashEntry[]      {          new HashEntry("name","Wilson"),          new HashEntry("sex",1)      });      Console.WriteLine(string.Join("n", db.HashGet("person", new RedisValue[] { "name", "sex" })));        Console.WriteLine(string.Join("n", db.HashGetAll("person")));  }

 

列表(List) 操作

 

static void RedisListOperation(ConnectionMultiplexer client)  {      var db = client.GetDatabase();        db.ListLeftPush("list", 100);      db.ListLeftPush("list", 200);      db.ListLeftPush("list", 300);      db.ListRightPush("list", 400);      db.ListRightPush("list", 500);        Console.WriteLine(db.ListLeftPop("list"));      Console.WriteLine(db.ListRightPop("list"));      Console.WriteLine(string.Join("t", db.ListRange("list", 0, 2)));      Console.WriteLine(db.ListLength("list"));  }

 

集合(Set)

 

static void RedisSetOperation(ConnectionMultiplexer client)  {      var db = client.GetDatabase();        db.SetAdd("user", "Wilson");      db.SetAdd("user", "Wilson");      db.SetAdd("user", "Alice");        Console.WriteLine(db.SetLength("user"));      Console.WriteLine(db.SetPop("user"));      Console.WriteLine(string.Join("n", db.SetMembers("user")));  }

 

有序集合(Sorted Set)

 

static void RedisSortedSetOperation(ConnectionMultiplexer client)  {      var db = client.GetDatabase();        db.KeyDelete("user");        db.SortedSetAdd("user", "Wilson", 90);      db.SortedSetAdd("user", "Alice", 85);      db.SortedSetAdd("user", "Trenary", 12);      db.SortedSetAdd("user", "Nixon", 30);        Console.WriteLine(db.SortedSetLength("user"));      Console.WriteLine(db.SortedSetRemove("user", "Wilson"));      Console.WriteLine(string.Join("n", db.SortedSetRangeByRank("user", 0, 2)));  }