How to use redis to realize distributed cache

use redis realize distributed cache


1 What is distributed caching

Distributed cache is a cache shared by multiple application servers , It is usually maintained as an external service on the application server that accesses it . Distributed caching can improve ASP.NET Core Application performance and scalability , Especially when applications are hosted by cloud services or server farms .

2 Redis What is it? ?

Redis Is a high-performance key-value database .Redis Extremely high performance , The speed at which you can read is 110000 Time /s, The speed of writing is 81000 Time /s.

3 Redis install

Here we don't go into details , You can refer to https://www.runoob.com/redis/redis-install.html Follow the steps to install .

4 Use Redis Distributed cache

First , We simply create a controller , Implement a simple method , Return current time . We can see that every time we visit this interface , You can see the current time .

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

then , take Microsoft.Extensions.Caching.Redis Of NuGet Install the package into your application .

Microsoft.Extensions.Caching.Redis

next , Use dependencies to inject services referenced from applications , stay Startup Class ConfigureServices() Configure in method :

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

next , The controller's constructor requests IDistributedCache example

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

Last , stay Get Method

[HttpGet]
public string Get()
{
// Read cache
var now = cache.Get("cacheNow");
if (now == null) // If there is no such cache
{
cache.Set("cacheNow", Encoding.UTF8.GetBytes(DateTime.Now.ToString()));
now = cache.Get("cacheNow");
return Encoding.UTF8.GetString(now);
}
else
{
return Encoding.UTF8.GetString(now);
}
}
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https://javamana.com/2021/01/20210114185512266h.html

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