Not Able to Implement MVC OutputCache K12 Example

Jared Hughes asked on May 14, 2019 19:00

Hello,

I have attempted to implement the MVC OutputCache example from the K12 documentation. The MVC output caching is working as intended, but I am struggling to observe the TouchKey behavior. In other words, if we update the Kentico page correlating to the dependencyCacheKey, the output remains cached for the duration specified in the MVC OutputCache attribute.

Here is my action method:

[OutputCache(Duration = 120, Location = OutputCacheLocation.Server, VaryByParam = "none")]
    public ActionResult Index()
    {
        Home home = homeRepository.GetHome();

        //// nodes|<site name>|<page type code name>|all
        //string dependencyCacheKey = $"nodes|{SiteContext.CurrentSiteName}|{home.ClassName}|all".ToLowerInvariant();

        //// node|<site name>|<alias path>
        //string dependencyCacheKey = $"node|{SiteContext.CurrentSiteName}|{home.NodeAliasPath}".ToLowerInvariant();

        //// nodeguid|<site name>|<node guid>
        //string dependencyCacheKey = $"nodeguid|{SiteContext.CurrentSiteName}|{home.NodeGuid}".ToLowerInvariant();

        // nodeid|<node id>
        string dependencyCacheKey = $"nodeid|{SiteContext.CurrentSiteName}|{home.NodeId}".ToLowerInvariant();


        CMS.Helpers.CacheHelper.EnsureDummyKey(dependencyCacheKey);
        HttpContext.Response.AddCacheItemDependency(dependencyCacheKey);

        // Create a new HomeViewModel instance based on the page data
        HomeViewModel homeModel = new HomeViewModel(home);

        return View(homeModel);
    }
}

Additional, we are not seeing the dependency key in Debug->Cache Items after invoking CacheHelper.EnsureDummyKey() (perhaps this is by design).

mvc output cache

Correct Answer

Mike Wills answered on May 14, 2019 20:17

Hi Jared,

Did you already verify that the MVC application is configured as a member of the Kentico Web Farm?

Mike

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Recent Answers

Dmitry Bastron answered on May 14, 2019 20:06

Hi Jared,

If you check DancingGoatMVC example website output cache dependencies are only on type (Page Types or Custom Classes):

public void AddDependencyOnPages<T>() where T : TreeNode, new()
{
    if (!mCacheEnabled)
    {
        return;
    }

    var className = mContentItemMetadataProvider.GetClassNameFromPageRuntimeType<T>();
    var dependencyCacheKey = String.Format("nodes|{0}|{1}|all", SiteContext.CurrentSiteName.ToLowerInvariant(), className);

    AddCacheItemDependency(dependencyCacheKey);
    AddCacheItemDependency("cms.adhocrelationship|all");
    AddCacheItemDependency("cms.relationship|all");
}

I think it might not be working with individual objects with this format

string dependencyCacheKey = $"nodeid|{SiteContext.CurrentSiteName}|{home.NodeId}".ToLowerInvariant();

I see in your code a couple of commented examples with "nodes|..|all" dummy key. Are they working for you?