Invalidating cache tag helper programmatically
# help-with-umbracoc
CodeSharePaul
07/27/2023, 9:26 AMI was looking for a solution for the
<cache><our-cache>w
Warren Buckley
07/27/2023, 9:51 AMHeya Paul. Not sure I understand the problem fully here? So using the cache taghelper is not working as you expect or …?!
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Matt Wise
07/27/2023, 9:54 AMIt detects debug mode and doesnt cache if I recall
Matt Wise
07/27/2023, 9:55 AMc
CodeSharePaul
07/27/2023, 10:17 AMHi @Warren Buckley, sorry my point was that with this we are relying on the cache refresher notification being sent in order for this to clear the cache, but if I just do a test of hooking into the content cache refresher event in a non load balanced environment and I publish the home page, my test which would write a log to say it fired does not get hit. So I am wondering if that is because my application is not set up for load balancing or because i am in dev or would you expect it to be hit in these circumstances. This is before installing your package. I'm trying to work out if it is relevant in all circumstances
w
Warren Buckley
07/27/2023, 10:27 AMThanks Matt good remembering that it doesn’t do anything when in dev !
Warren Buckley
07/27/2023, 10:27 AMHmm that event should fire AFAIK but would need to go source code diving to be certain
Warren Buckley
07/27/2023, 10:34 AMSo we use that notification as well and my test site is not load balanced at all
Warren Buckley
07/27/2023, 10:34 AMc
CodeSharePaul
07/27/2023, 10:58 AMHaha hang on, silly me, i may not have done the composer bit, just the notification bit. Sorry for wasting your time
w
Warren Buckley
07/27/2023, 11:41 AMNo worries mate - happens to the best of us
c
CodeSharePaul
07/27/2023, 3:41 PMCodeSharePaul
07/27/2023, 3:41 PMCodeSharePaul
07/27/2023, 3:42 PM Copy code
cs
using Umbraco.Cms.Core.Events;
using Umbraco.Cms.Core.Notifications;
namespace MyProject.NotificationHandlers;
public class CacheRefresherNotificationHandler :
INotificationHandler<ContentCacheRefresherNotification>,
INotificationHandler<DictionaryCacheRefresherNotification>,
INotificationHandler<MediaCacheRefresherNotification>
{
private readonly ILogger<CacheRefresherNotificationHandler> _logger;
public CacheRefresherNotificationHandler(ILogger<CacheRefresherNotificationHandler> logger)
{
_logger = logger;
}
public void Handle(ContentCacheRefresherNotification notification)
{
_logger.LogInformation("Content Cache Cleared");
}
public void Handle(DictionaryCacheRefresherNotification notification)
{
_logger.LogInformation("Dictionary Cache Cleared");
}
public void Handle(MediaCacheRefresherNotification notification)
{
_logger.LogInformation("Media Cache Cleared");
}
}CodeSharePaul
07/27/2023, 3:42 PM Copy code
cs
using MyProject.NotificationHandlers;
using Umbraco.Cms.Core.Composing;
using Umbraco.Cms.Core.Notifications;
namespace MyProject.Composers;
public class RegisterNotificationHandlersComposer : IComposer
{
public void Compose(IUmbracoBuilder builder)
{
builder.AddNotificationHandler<ContentCacheRefresherNotification, CacheRefresherNotificationHandler>();
builder.AddNotificationHandler<MediaCacheRefresherNotification, CacheRefresherNotificationHandler>();
builder.AddNotificationHandler<DictionaryCacheRefresherNotification, CacheRefresherNotificationHandler>();
}
}CodeSharePaul
07/27/2023, 3:44 PMHad chance to test out that these notifications do get called in a non load balanced environment.
If i save and publish a content item it logs
Content Cache ClearedMedia Cache ClearedDictionary Cache ClearedCodeSharePaul
07/27/2023, 3:45 PMThis gives me confidence to go with this
<our-cache>2 Views