Umbraco-CMS/src/Umbraco.Core/Cache/TemplateCacheRefresher.cs

using System;
using Umbraco.Cms.Core.Events;
using Umbraco.Cms.Core.Models;
using Umbraco.Cms.Core.Notifications;
using Umbraco.Cms.Core.Persistence.Repositories;
using Umbraco.Cms.Core.Services;

namespace Umbraco.Cms.Core.Cache
{
    public sealed class TemplateCacheRefresher : CacheRefresherBase<TemplateCacheRefresherNotification>
    {
        private readonly IIdKeyMap _idKeyMap;
        private readonly IContentTypeCommonRepository _contentTypeCommonRepository;

        public TemplateCacheRefresher(AppCaches appCaches, IIdKeyMap idKeyMap, IContentTypeCommonRepository contentTypeCommonRepository, IEventAggregator eventAggregator, ICacheRefresherNotificationFactory factory)
            : base(appCaches, eventAggregator, factory)
        {
            _idKeyMap = idKeyMap;
            _contentTypeCommonRepository = contentTypeCommonRepository;
        }

        #region Define

        public static readonly Guid UniqueId = Guid.Parse("DD12B6A0-14B9-46e8-8800-C154F74047C8");

        public override Guid RefresherUniqueId => UniqueId;

        public override string Name => "Template Cache Refresher";

        #endregion

        #region Refresher

        public override void Refresh(int id)
        {
            RemoveFromCache(id);
            base.Refresh(id);
        }

        public override void Remove(int id)
        {
            RemoveFromCache(id);

            //During removal we need to clear the runtime cache for templates, content and content type instances!!!
            // all three of these types are referenced by templates, and the cache needs to be cleared on every server,
            // otherwise things like looking up content type's after a template is removed is still going to show that
            // it has an associated template.
            ClearAllIsolatedCacheByEntityType<IContent>();
            ClearAllIsolatedCacheByEntityType<IContentType>();
            _contentTypeCommonRepository.ClearCache();

            base.Remove(id);
        }

        private void RemoveFromCache(int id)
        {
            _idKeyMap.ClearCache(id);
            AppCaches.RuntimeCache.Clear($"{CacheKeys.TemplateFrontEndCacheKey}{id}");

            //need to clear the runtime cache for templates
            ClearAllIsolatedCacheByEntityType<ITemplate>();
        }

        #endregion
    }
}