Option for disk-backed cache

[aspnet-hello]

From @benaadams on Saturday, July 2, 2016 8:31:47 PM

So when items are evicted due to memory pressure or over recycles they can be resurrected if needed without regeneration if within cache period.

Similar to Using Static Content Generation in ASP.NET Core by @MaximRouiller

Copied from original issue: aspnet/ResponseCaching#8

[speige]

+1

[speige]

This can be done by creating a custom class which implements IResponseCache and injecting it with the following code (uses reflection):

  public class CustomResponseCachingMiddleware : ResponseCachingMiddleware
  {
    public CustomResponseCachingMiddleware(RequestDelegate next, IOptions<ResponseCachingOptions> options, ILoggerFactory loggerFactory, IResponseCachingPolicyProvider policyProvider, IResponseCachingKeyProvider keyProvider) : base(next, options, loggerFactory, policyProvider, keyProvider)
    {
      FieldInfo cacheFieldInfo = typeof(ResponseCachingMiddleware).GetField("_cache", BindingFlags.NonPublic | BindingFlags.Instance);

      cacheFieldInfo.SetValue(this, new MyCustomCache());
    }
  }

  //app.UseResponseCaching();
  app.UseMiddleware<CustomResponseCachingMiddleware>();

[speige]

I've created a repo for custom cache implementations. It currently only has a disk-backed memory cache. It also has extensions which make ResponseCaching easily overridable for others who wish to code custom implementations.

License is MIT. Feel free to pull it into the official Microsoft repo.

https://github.com/speige/AspNetCore.ResponseCaching.Extensions
https://www.nuget.org/packages/AspNetCore.ResponseCaching.Extensions

[JunTaoLuo]

We're glad to see community contributions on this issue! However, it's unlikely we'll incorporate the implementation here unless there's more demand for this issue.