如何使用Redis实现分布式缓存

南荣相如谈编程 2021-01-14 18:55:31
分布式 redis 使用 实现 分布


1 分布式缓存是什么

分布式缓存是由多个应用服务器共享的缓存,通常作为外部服务在访问它的应用服务器上维护。 分布式缓存可以提高 ASP.NET Core 应用程序的性能和可伸缩性,尤其是在应用程序由云服务或服务器场托管时。

2 Redis是什么?

Redis是一个高性能的 key-value 数据库。Redis性能极高,能读的速度是110000次/s,写的速度是81000次/s。

3 Redis 安装

这里我们不具体展开,你可以参考 https://www.runoob.com/redis/redis-install.html 按步骤进行安装。

4 使用 Redis 分布式缓存

首先,我们简单的创建一个控制器,实现一个简单方法,返回当前时间。我们可以看到每次访问这个接口,都可以看到当前时间。

[Route("api/[controller]")]
[ApiController]
public class CacheController : ControllerBase
{
[HttpGet]
public string Get()
{
return DateTime.Now.ToString();
}
}

然后,将Microsoft.Extensions.Caching.Redis的NuGet软件包安装到您的应用程序中。

Microsoft.Extensions.Caching.Redis

接着,使用依赖关系注入从应用中引用的服务,在Startup类的ConfigureServices()方法中配置:

public void ConfigureServices(IServiceCollection services)
{
// install-package Microsoft.Extensions.Caching.Redis
services.AddDistributedRedisCache(options =>
{
options.InstanceName = "";
options.Configuration = "127.0.0.1:6379";
});
}

接着,控制器的构造函数中请求IDistributedCache实例

private IDistributedCache cache;
public RedisCacheController(IDistributedCache cache)
{
this.cache = cache ?? throw new ArgumentNullException(nameof(cache));
}

最后,在Get方法中使用缓存

[HttpGet]
public string Get()
{
//读取缓存
var now = cache.Get("cacheNow");
if (now == null) //如果没有该缓存
{
cache.Set("cacheNow", Encoding.UTF8.GetBytes(DateTime.Now.ToString()));
now = cache.Get("cacheNow");
return Encoding.UTF8.GetString(now);
}
else
{
return Encoding.UTF8.GetString(now);
}
}
版权声明
本文为[南荣相如谈编程]所创,转载请带上原文链接,感谢
https://www.cnblogs.com/zcqiand/p/14257582.html

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