MigrationComponent.cs


using Microsoft.Extensions.Logging;

using Umbraco.Cms.Core.Composing;
using Umbraco.Cms.Core.DependencyInjection;
using Umbraco.Cms.Core.Events;
using Umbraco.Cms.Core.Migrations;
using Umbraco.Cms.Core.Notifications;
using Umbraco.Cms.Core.Scoping;
using Umbraco.Cms.Core.Services;
using Umbraco.Cms.Infrastructure.Migrations;
using Umbraco.Cms.Infrastructure.Migrations.Upgrade;

namespace DoStuff.Core.Migrations
{
    /// <summary>
    ///  Register an event handler, so we can do stuff when the site starts.
    /// </summary>
    public class MigrationComponentComposer : IUserComposer
    {
        public void Compose(IUmbracoBuilder builder)
        {
            builder.AddNotificationHandler<UmbracoApplicationStartingNotification, MigrationAppStartingHandler>();
        }
    }

    public class MigrationAppStartingHandler : INotificationHandler<UmbracoApplicationStartingNotification>
    {
        private readonly IScopeProvider _scopeProvider;
        private readonly IKeyValueService _keyValueService;
        private readonly IMigrationPlanExecutor _migrationPlanExecutor;


        public MigrationAppStartingHandler(
            IScopeProvider scopeProvider,
            IKeyValueService keyValueService,
            IMigrationPlanExecutor migrationPlanExecutor)
        { 
            _scopeProvider = scopeProvider;
            _keyValueService = keyValueService;
            _migrationPlanExecutor = migrationPlanExecutor;
        }

        public void Handle(UmbracoApplicationStartingNotification notification)
        {
            if (notification.RuntimeLevel >= Umbraco.Cms.Core.RuntimeLevel.Run)
            {
                // register and run our migration plan 
                var upgrader = new Upgrader(new DoStuffMigrationPlan());
                upgrader.Execute(_migrationPlanExecutor, _scopeProvider, _keyValueService);
            }
        }
    }
}