Hello, I have a situation where my cache doesn't seem to be cleared when using Umbraco Cloud (on the standard plan).

In some parts of my code I have been querying the content tree and processing the content, then adding the processed data into AppCache.RuntimeCache.

I implemented a custom class with INotificationHandler to trigger on ContentPublishedNotification, ContentDeletedNotification and ContentSavedNotification from the backoffice save/publish/delete buttons and clearing the objects from AppCaches.RuntimeCache

I used the documentation available for accessing the cache and updating it.

This works fine locally but seems to be erratic on Umbraco Cloud and thought maybe this could be linked to load-balanced scenarios, since INotificationHandler will trigger only on the master server where the backoffice resides.

After much digging I came across this documentation about ICacheRefresher which mentions distributed cache management but apparently, from this forum post here, this is used when you have custom implementation in the backoffice and use that to trigger an event on all nodes.

The same post mentions the usage of PageCacheRefresher.CacheUpdated instead and digging some more, I found another forum post showing how to use it.

Given my scenario, I believe I could just listen to that CacheUpdated event and trigger my cache clearing for my type. I inspired myself from the code in this GitHub issue and tried the following:

public class NewsCacheRefreshed : IComponent
{
    public void Initialize()
    {
        CacheRefresherBase<ContentCacheRefresher>.CacheUpdated += CacheUpdated;
    }

    private void CacheUpdated(ContentCacheRefresher sender, CacheRefresherEventArgs e)
    {
      // clear my cache here
    }

    public void Terminate()
    {            
    }
}

However, this doesn't work because it seems in V9 there is no CacheUpdated property in the CacheRefresherBase class and ContentCacheRefresher needs to be Notification type class.

I'm at a loss on how to proceed here since I could not find the CacheUpdated property anywhere, how do I susbcribe to those events? The documentation is completely lacking in this regard, having searched through and through for a couple of days now.

Any help regarding this would be much appreciated, thank you.