DictionaryCacheRefresherNotificationHandler.cs

using Umbraco.Cms.Core.Events;
using Umbraco.Cms.Core.Models;
using Umbraco.Cms.Core.Notifications;
using Umbraco.Cms.Core.Services;
using Umbraco.Cms.Core.Sync;

namespace Umbraco.Deploy.OnPrem.TestSite.Business
{
    public class DictionaryCacheRefresherNotificationHandler : INotificationHandler<DictionaryCacheRefresherNotification>
    {
        private readonly ILogger<DictionaryCacheRefresherNotificationHandler> _logger;
        private readonly IServerRoleAccessor _serverRoleAccessor;
        private readonly ILocalizationService _localizationService;

        public DictionaryCacheRefresherNotificationHandler(
            ILogger<DictionaryCacheRefresherNotificationHandler> logger,
            IServerRoleAccessor serverRoleAccessor,
            ILocalizationService localizationService)
        {
            _logger = logger;
            _serverRoleAccessor = serverRoleAccessor;
            _localizationService = localizationService;
        }

        public void Handle(DictionaryCacheRefresherNotification notification)
        {
            ServerRole serverRole = _serverRoleAccessor.CurrentServerRole;
            if (!(serverRole == ServerRole.Single || serverRole == ServerRole.SchedulingPublisher))
            {
                return;
            }

            if (notification.MessageType != MessageType.RefreshById)
            {
                return;
            }

            var dictionaryItemId = (int)notification.MessageObject;
            IDictionaryItem? dictionaryItem = _localizationService.GetDictionaryItemById(dictionaryItemId);
            if (dictionaryItem == null)
            {
                _logger.LogWarning(
                    "DictionaryCacheRefresherNotification handled for type {MessageType} but dictionary item with Id {Id} could not be found.",
                    notification.MessageType,
                    dictionaryItemId);
                return;
            }

            // Do something with the dictionary item.
            // Here we'll just log some details.
            _logger.LogInformation(
                "DictionaryCacheRefresherNotification handled for type {MessageType} and id {Id}. " +
                "Key: {Key}, Default Value: {DefaultValue}",
                notification.MessageType,
                dictionaryItemId,
                dictionaryItem.ItemKey,
                dictionaryItem.GetDefaultValue());
        }
    }
}