Replay

src/Squidex.Core/Schemas/Json/SchemaJsonSerializer.cs

@@ -7,6 +7,7 @@
 // ==========================================================================
 
 using System.Collections.Generic;
+using System.Collections.Immutable;
 using System.Linq;
 using Newtonsoft.Json;
 using Newtonsoft.Json.Linq;
@@ -76,31 +77,32 @@ namespace Squidex.Core.Schemas.Json
         {
             var model = token.ToObject<SchemaModel>(serializer);
 
-            var schema = Schema.Create(model.Name, model.Properties);
-
-            if (model.IsPublished)
-            {
-                schema = schema.Publish();
-            }
+            var fields =
+                model.Fields.Select(kvp =>
+                {
+                    var fieldModel = kvp.Value;
 
-            foreach (var kvp in model.Fields)
-            {
-                var fieldModel = kvp.Value;
+                    var field = fieldRegistry.CreateField(kvp.Key, fieldModel.Name, fieldModel.Properties);
 
-                var field = fieldRegistry.CreateField(kvp.Key, fieldModel.Name, fieldModel.Properties);
+                    if (fieldModel.IsDisabled)
+                    {
+                        field = field.Disable();
+                    }
 
-                if (fieldModel.IsDisabled)
-                {
-                    field = field.Disable();
-                }
+                    if (fieldModel.IsHidden)
+                    {
+                        field = field.Hide();
+                    }
 
-                if (fieldModel.IsHidden)
-                {
-                    field = field.Hide();
-                }
+                    return field;
+                }).ToDictionary(x => x.Id, x => x).ToImmutableDictionary();
 
-                schema = schema.AddOrUpdateField(field);
-            }
+            var schema =
+                new Schema(
+                    model.Name,
+                    model.Properties,
+                    model.IsPublished,
+                    fields);
 
             return schema;
         }

src/Squidex.Events/Schemas/Utils/SchemaEventDispatcher.cs

@@ -0,0 +1,70 @@
+// ==========================================================================
+//  SchemaUpdater.cs
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex Group
+//  All rights reserved.
+// ==========================================================================
+
+using Squidex.Core.Schemas;
+
+namespace Squidex.Events.Schemas.Utils
+{
+    public class SchemaEventDispatcher
+    {
+        public static Schema Dispatch(SchemaCreated @event)
+        {
+            return Schema.Create(@event.Name, @event.Properties);
+        }
+
+        public static Schema Dispatch(FieldAdded @event, Schema schema, FieldRegistry registry)
+        {
+            return schema.AddOrUpdateField(registry.CreateField(@event.FieldId, @event.Name, @event.Properties));
+        }
+
+        public static Schema Dispatch(FieldUpdated @event, Schema schema)
+        {
+            return schema.UpdateField(@event.FieldId, @event.Properties);
+        }
+
+        public static Schema Dispatch(FieldHidden @event, Schema schema)
+        {
+            return schema.HideField(@event.FieldId);
+        }
+
+        public static Schema Dispatch(FieldShown @event, Schema schema)
+        {
+            return schema.ShowField(@event.FieldId);
+        }
+
+        public static Schema Dispatch(FieldDisabled @event, Schema schema)
+        {
+            return schema.DisableField(@event.FieldId);
+        }
+
+        public static Schema Dispatch(FieldEnabled @event, Schema schema)
+        {
+            return schema.EnableField(@event.FieldId);
+        }
+
+        public static Schema Dispatch(SchemaUpdated @event, Schema schema)
+        {
+            return schema.Update(@event.Properties);
+        }
+
+        public static Schema Dispatch(FieldDeleted @event, Schema schema)
+        {
+            return schema.DeleteField(@event.FieldId);
+        }
+
+        public static Schema Dispatch(SchemaPublished @event, Schema schema)
+        {
+            return schema.Publish();
+        }
+
+        public static Schema Dispatch(SchemaUnpublished @event, Schema schema)
+        {
+            return schema.Unpublish();
+        }
+    }
+}

src/Squidex.Infrastructure.MongoDb/MongoRepositoryBase.cs

@@ -6,6 +6,7 @@
 //  All rights reserved.
 // ==========================================================================
 
+using System;
 using System.Globalization;
 using System.Threading.Tasks;
 using MongoDB.Driver;
@@ -15,7 +16,7 @@ namespace Squidex.Infrastructure.MongoDb
     public abstract class MongoRepositoryBase<TEntity>
     {
         private const string CollectionFormat = "{0}Set";
-        private readonly IMongoCollection<TEntity> mongoCollection;
+        private Lazy<IMongoCollection<TEntity>> mongoCollection;
         private readonly IMongoDatabase mongoDatabase;
         private readonly string typeName;
 
@@ -71,7 +72,7 @@ namespace Squidex.Infrastructure.MongoDb
         {
             get
             {
-                return mongoCollection;
+                return mongoCollection.Value;
             }
         }
 
@@ -103,20 +104,39 @@ namespace Squidex.Infrastructure.MongoDb
             return string.Format(CultureInfo.InvariantCulture, CollectionFormat, typeof(TEntity).Name);
         }
 
-        private IMongoCollection<TEntity> CreateCollection()
+        private Lazy<IMongoCollection<TEntity>> CreateCollection()
         {
-            var databaseCollection = mongoDatabase.GetCollection<TEntity>(
-                CollectionName(),
-                CollectionSettings() ?? new MongoCollectionSettings());
+            return new Lazy<IMongoCollection<TEntity>>(() =>
+            {
+                var databaseCollection = mongoDatabase.GetCollection<TEntity>(
+                    CollectionName(),
+                    CollectionSettings() ?? new MongoCollectionSettings());
 
-            SetupCollectionAsync(databaseCollection).Wait();
+                SetupCollectionAsync(databaseCollection).Wait();
 
-            return databaseCollection;
+                return databaseCollection;
+            });
         }
 
         protected virtual Task SetupCollectionAsync(IMongoCollection<TEntity> collection)
         {
             return Task.FromResult(true);
         }
+
+        public async Task<bool> TryDropCollectionAsync()
+        {
+            try
+            {
+                await mongoDatabase.DropCollectionAsync(CollectionName());
+
+                mongoCollection = CreateCollection();
+
+                return true;
+            }
+            catch
+            {
+                return false;
+            }
+        }
     }
 }

src/Squidex.Infrastructure.RabbitMq/RabbitMqEventChannel.cs

@@ -35,13 +35,13 @@ namespace Squidex.Infrastructure.RabbitMq
             }
         }
 
-        public void Publish(EventData events)
+        public void Publish(EventData eventData)
         {
             ThrowIfDisposed();
 
             var channel = currentChannel.Value;
 
-            channel.BasicPublish(Exchange, string.Empty, null, Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(events)));
+            channel.BasicPublish(Exchange, string.Empty, null, Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(eventData)));
         }
 
         public void Connect(string queueName, Action<EventData> received)
@@ -64,7 +64,7 @@ namespace Squidex.Infrastructure.RabbitMq
                 received(eventData);
             };
 
-            channel.BasicConsume(queueName, false, consumer);
+            channel.BasicConsume(queueName, true, consumer);
         }
 
         private static IModel Connect(IConnectionFactory connectionFactory)

src/Squidex.Infrastructure/CQRS/Commands/DefaultDomainObjectRepository.cs

@@ -89,7 +89,7 @@ namespace Squidex.Infrastructure.CQRS.Commands
             {
                 await eventStore.AppendEventsAsync(commitId, streamName, versionExpected, eventsToSave);
             }
-            catch (WrongEventVersionException e)
+            catch (WrongEventVersionException)
             {
                 throw new DomainObjectVersionException(domainObject.Id.ToString(), domainObject.GetType(), versionCurrent, versionExpected);
             }

src/Squidex/Pipeline/CommandHandlers/LogExceptionHandler.cs → src/Squidex.Infrastructure/CQRS/Commands/LogExceptionHandler.cs

@@ -8,11 +8,10 @@
 
 using System.Threading.Tasks;
 using Microsoft.Extensions.Logging;
-using Squidex.Infrastructure.CQRS.Commands;
 
 // ReSharper disable InvertIf
 
-namespace Squidex.Pipeline.CommandHandlers
+namespace Squidex.Infrastructure.CQRS.Commands
 {
     public sealed class LogExceptionHandler : ICommandHandler
     {
@@ -29,9 +28,7 @@ namespace Squidex.Pipeline.CommandHandlers
 
             if (exception != null)
             {
-                var eventId = new EventId(9999, "CommandFailed");
-
-                logger.LogError(eventId, exception, "Handling {0} command failed", context.Command);
+                logger.LogError(InfrastructureErrors.CommandFailed, exception, "Handling {0} command failed", context.Command);
             }
 
             return Task.FromResult(false);

src/Squidex/Pipeline/CommandHandlers/LogExecutingHandler.cs → src/Squidex.Infrastructure/CQRS/Commands/LogExecutingHandler.cs

@@ -8,9 +8,8 @@
 
 using System.Threading.Tasks;
 using Microsoft.Extensions.Logging;
-using Squidex.Infrastructure.CQRS.Commands;
 
-namespace Squidex.Pipeline.CommandHandlers
+namespace Squidex.Infrastructure.CQRS.Commands
 {
     public sealed class LogExecutingHandler : ICommandHandler
     {
@@ -23,7 +22,7 @@ namespace Squidex.Pipeline.CommandHandlers
 
         public Task<bool> HandleAsync(CommandContext context)
         {
-            logger.LogError("Handling {0} command", context.Command);
+            logger.LogInformation("Handling {0} command", context.Command);
 
             return Task.FromResult(false);
         }

src/Squidex.Infrastructure/CQRS/Events/EventBus.cs → src/Squidex.Infrastructure/CQRS/Events/EventReceiver.cs

@@ -1,5 +1,5 @@
 // ==========================================================================
-//  EventBus.cs
+//  EventReceiver.cs
 //  Squidex Headless CMS
 // ==========================================================================
 //  Copyright (c) Squidex Group
@@ -18,17 +18,17 @@ using NodaTime;
 
 namespace Squidex.Infrastructure.CQRS.Events
 {
-    public sealed class EventBus
+    public sealed class EventReceiver
     {
         private readonly EventDataFormatter formatter;
         private readonly IEnumerable<ILiveEventConsumer> liveConsumers;
         private readonly IEnumerable<ICatchEventConsumer> catchConsumers;
         private readonly IEventStream eventStream;
-        private readonly ILogger<EventBus> logger;
+        private readonly ILogger<EventReceiver> logger;
         private bool isSubscribed;
 
-        public EventBus(
-            ILogger<EventBus> logger,
+        public EventReceiver(
+            ILogger<EventReceiver> logger,
             IEventStream eventStream,
             IEnumerable<ILiveEventConsumer> liveConsumers,
             IEnumerable<ICatchEventConsumer> catchConsumers,
@@ -69,11 +69,11 @@ namespace Squidex.Infrastructure.CQRS.Events
 
                 if (isLive)
                 {
-                    DispatchConsumers(liveConsumers.OfType<IEventConsumer>().Union(catchConsumers), @event);
+                    DispatchConsumers(catchConsumers.OfType<IEventConsumer>().Union(liveConsumers), @event);
                 }
                 else
                 {
-                    DispatchConsumers(liveConsumers, @event);
+                    DispatchConsumers(catchConsumers, @event);
                 }
             });
 

src/Squidex.Infrastructure/CQRS/Events/IEventPublisher.cs

@@ -10,6 +10,6 @@ namespace Squidex.Infrastructure.CQRS.Events
 {
     public interface IEventPublisher
     {
-        void Publish(EventData events);
+        void Publish(EventData eventData);
     }
 }

src/Squidex.Infrastructure/CQRS/Replay/IReplayableStore.cs

@@ -0,0 +1,17 @@
+// ==========================================================================
+//  IReplayableStore.cs
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex Group
+//  All rights reserved.
+// ==========================================================================
+
+using System.Threading.Tasks;
+
+namespace Squidex.Infrastructure.CQRS.Replay
+{
+    public interface IReplayableStore
+    {
+        Task ClearAsync();
+    }
+}

src/Squidex.Infrastructure/CQRS/Replay/ReplayGenerator.cs

@@ -0,0 +1,100 @@
+// ==========================================================================
+//  ReplayGenerator.cs
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex Group
+//  All rights reserved.
+// ==========================================================================
+
+using System;
+using System.Collections.Generic;
+using System.Reactive.Linq;
+using System.Threading.Tasks;
+using Microsoft.Extensions.Logging;
+using Squidex.Infrastructure.CQRS.Events;
+
+namespace Squidex.Infrastructure.CQRS.Replay
+{
+    public sealed class ReplayGenerator
+    {
+        private readonly ILogger<ReplayGenerator> logger;
+        private readonly IEventStore eventStore;
+        private readonly IEventPublisher eventPublisher;
+        private readonly IEnumerable<IReplayableStore> stores;
+
+        public ReplayGenerator(
+            ILogger<ReplayGenerator> logger,
+            IEventStore eventStore, 
+            IEventPublisher eventPublisher, 
+            IEnumerable<IReplayableStore> stores)
+        {
+            Guard.NotNull(logger, nameof(logger));
+            Guard.NotNull(eventStore, nameof(eventStore));
+            Guard.NotNull(eventPublisher, nameof(eventPublisher));
+            Guard.NotNull(stores, nameof(stores));
+
+            this.stores = stores;
+            this.logger = logger;
+            this.eventStore = eventStore;
+            this.eventPublisher = eventPublisher;
+        }
+
+        public async Task ReplayAllAsync()
+        {
+            logger.LogDebug("Starting to replay all events");
+
+            if (!await ClearAsync())
+            {
+                return;
+            }
+
+            await ReplayEventsAsync();
+
+            logger.LogDebug("Finished to replay all events");
+        }
+
+        private async Task ReplayEventsAsync()
+        {
+            try
+            {
+                logger.LogDebug("Replaying all messages");
+
+                await eventStore.GetEventsAsync().ForEachAsync(eventData =>
+                {
+                    eventPublisher.Publish(eventData);
+                });
+
+                logger.LogDebug("Replayed all messages");
+            }
+            catch (Exception e)
+            {
+                logger.LogCritical(InfrastructureErrors.ReplayPublishingFailed, e, "Failed to publish events to {0}", eventPublisher);
+            }
+        }
+
+        private async Task<bool> ClearAsync()
+        {
+            logger.LogDebug("Clearing replayable stores");
+
+            foreach (var store in stores)
+            {
+                try
+                {
+                    await store.ClearAsync();
+
+                    logger.LogDebug("Cleared store {0}", store);
+                }
+                catch (Exception e)
+                {
+                    logger.LogCritical(InfrastructureErrors.ReplayClearingFailed, e, "Failed to clear store {0}", store);
+
+                    return false;
+                }
+            }
+
+            logger.LogDebug("Cleared replayable stores");
+
+            return true;
+        }
+    }
+}

src/Squidex.Infrastructure/InfrastructureErrors.cs

@@ -12,8 +12,14 @@ namespace Squidex.Infrastructure
 {
     public class InfrastructureErrors
     {
+        public static readonly EventId CommandFailed = new EventId(20001, "CommandFailed");
+
         public static readonly EventId EventHandlingFailed = new EventId(10001, "EventHandlingFailed");
 
         public static readonly EventId EventDeserializationFailed = new EventId(10002, "EventDeserializationFailed");
+
+        public static readonly EventId ReplayClearingFailed = new EventId(30001, "ReplayClearingFailed");
+
+        public static readonly EventId ReplayPublishingFailed = new EventId(30003, "ReplayPublishingFailed");
     }
 }

src/Squidex.Read/Apps/Services/Implementations/CachingAppProvider.cs

@@ -20,7 +20,7 @@ using Squidex.Read.Utils;
 
 namespace Squidex.Read.Apps.Services.Implementations
 {
-    public class CachingAppProvider : CachingProvider, IAppProvider, ILiveEventConsumer
+    public class CachingAppProvider : CachingProvider, IAppProvider, ICatchEventConsumer
     {
         private static readonly TimeSpan CacheDuration = TimeSpan.FromMinutes(30);
         private readonly IAppRepository appRepository;

src/Squidex.Read/Schemas/SchemaHistoryEventsCreator.cs

@@ -8,7 +8,6 @@
 
 using System.Collections.Generic;
 using System.Threading.Tasks;
-using Squidex.Events;
 using Squidex.Events.Schemas;
 using Squidex.Infrastructure;
 using Squidex.Infrastructure.CQRS;
@@ -103,11 +102,11 @@ namespace Squidex.Read.Schemas
             return this.DispatchFuncAsync(@event.Payload, @event.Headers, (HistoryEventToStore)null);
         }
 
-        private Task<string> FindSchemaNameAsync(EnvelopeHeaders headers)
+        private async Task<string> FindSchemaNameAsync(EnvelopeHeaders headers)
         {
-            var name = schemaProvider.FindSchemaNameByIdAsync(headers.AppId(), headers.AggregateId());
+            var schema = await schemaProvider.ProviderSchemaByIdAsync(headers.AggregateId());
 
-            return name;
+            return schema.Label ?? schema.Name;
         }
     }
 }

src/Squidex.Read/Schemas/Services/ISchemaProvider.cs

@@ -8,13 +8,14 @@
 
 using System;
 using System.Threading.Tasks;
+using Squidex.Read.Schemas.Repositories;
 
 namespace Squidex.Read.Schemas.Services
 {
     public interface ISchemaProvider
     {
-        Task<string> FindSchemaNameByIdAsync(Guid schemaId);
+        Task<ISchemaEntityWithSchema> ProviderSchemaByIdAsync(Guid schemaId);
 
-        Task<Guid?> FindSchemaIdByNameAsync(Guid appId, string name);
+        Task<ISchemaEntityWithSchema> ProvideSchemaByNameAsync(Guid appId, string name);
     }
 }

src/Squidex.Read/Schemas/Services/Implementations/CachingSchemaProvider.cs

@@ -21,16 +21,14 @@ using Squidex.Events;
 
 namespace Squidex.Read.Schemas.Services.Implementations
 {
-    public class CachingSchemaProvider : CachingProvider, ISchemaProvider, ILiveEventConsumer
+    public class CachingSchemaProvider : CachingProvider, ISchemaProvider, ICatchEventConsumer
     {
         private static readonly TimeSpan CacheDuration = TimeSpan.FromMinutes(10);
         private readonly ISchemaRepository repository;
 
         private sealed class CacheItem
         {
-            public Guid? Id;
-
-            public string Name;
+            public ISchemaEntityWithSchema Entity;
         }
 
         public CachingSchemaProvider(IMemoryCache cache, ISchemaRepository repository)
@@ -41,29 +39,29 @@ namespace Squidex.Read.Schemas.Services.Implementations
             this.repository = repository;
         }
 
-        public async Task<string> FindSchemaNameByIdAsync(Guid schemaId)
+        public async Task<ISchemaEntityWithSchema> ProviderSchemaByIdAsync(Guid schemaId)
         {
             var cacheKey = BuildIdCacheKey(schemaId);
             var cacheItem = Cache.Get<CacheItem>(cacheKey);
 
             if (cacheItem == null)
             {
-                var schema = await repository.FindSchemaAsync(schemaId);
+                var entity = await repository.FindSchemaAsync(schemaId);
 
-                cacheItem = new CacheItem { Id = schema?.Id, Name = schema?.Name };
+                cacheItem = new CacheItem { Entity = entity };
 
                 Cache.Set(cacheKey, cacheItem, CacheDuration);
 
-                if (cacheItem.Id != null)
+                if (cacheItem.Entity != null)
                 {
-                    Cache.Set(BuildIdCacheKey(cacheItem.Id.Value), cacheItem, CacheDuration);
+                    Cache.Set(BuildIdCacheKey(cacheItem.Entity.Id), cacheItem, CacheDuration);
                 }
             }
 
-            return cacheItem.Name;
+            return cacheItem.Entity;
         }
 
-        public async Task<Guid?> FindSchemaIdByNameAsync(Guid appId, string name)
+        public async Task<ISchemaEntityWithSchema> ProvideSchemaByNameAsync(Guid appId, string name)
         {
             Guard.NotNullOrEmpty(name, nameof(name));
 
@@ -72,19 +70,19 @@ namespace Squidex.Read.Schemas.Services.Implementations
 
             if (cacheItem == null)
             {
-                var schema = await repository.FindSchemaAsync(appId, name);
+                var entity = await repository.FindSchemaAsync(appId, name);
 
-                cacheItem = new CacheItem { Id = schema?.Id, Name = schema?.Name };
+                cacheItem = new CacheItem { Entity = entity };
 
                 Cache.Set(cacheKey, cacheItem, CacheDuration);
 
-                if (cacheItem.Id != null)
+                if (cacheItem.Entity != null)
                 {
-                    Cache.Set(BuildIdCacheKey(cacheItem.Id.Value), cacheItem, CacheDuration);
+                    Cache.Set(BuildIdCacheKey(cacheItem.Entity.Id), cacheItem, CacheDuration);
                 }
             }
 
-            return cacheItem.Id;
+            return cacheItem.Entity;
         }
 
         public Task On(Envelope<IEvent> @event)
@@ -96,9 +94,9 @@ namespace Squidex.Read.Schemas.Services.Implementations
 
                 var cacheItem = Cache.Get<CacheItem>(cacheKey);
 
-                if (cacheItem.Name != null)
+                if (cacheItem?.Entity != null)
                 {
-                    Cache.Remove(BuildNameCacheKey(@event.Headers.AppId(), cacheItem.Name));
+                    Cache.Remove(BuildNameCacheKey(@event.Headers.AppId(), cacheItem.Entity.Name));
                 }
 
                 Cache.Remove(cacheKey);

src/Squidex.Store.MongoDb/Apps/MongoAppRepository.cs

@@ -18,11 +18,12 @@ using Squidex.Read.Apps;
 using Squidex.Read.Apps.Repositories;
 using Squidex.Store.MongoDb.Utils;
 using Squidex.Infrastructure;
+using Squidex.Infrastructure.CQRS.Replay;
 using Squidex.Infrastructure.MongoDb;
 
 namespace Squidex.Store.MongoDb.Apps
 {
-    public class MongoAppRepository : MongoRepositoryBase<MongoAppEntity>, IAppRepository, ICatchEventConsumer
+    public class MongoAppRepository : MongoRepositoryBase<MongoAppEntity>, IAppRepository, ICatchEventConsumer, IReplayableStore
     {
         public MongoAppRepository(IMongoDatabase database) 
             : base(database)
@@ -39,6 +40,11 @@ namespace Squidex.Store.MongoDb.Apps
             return collection.Indexes.CreateOneAsync(IndexKeys.Ascending(x => x.Name));
         }
 
+        public Task ClearAsync()
+        {
+            return TryDropCollectionAsync();
+        }
+
         public async Task<IReadOnlyList<IAppEntity>> QueryAllAsync(string subjectId)
         {
             var entities =

src/Squidex.Store.MongoDb/History/MongoHistoryEventEntity.cs

@@ -22,6 +22,10 @@ namespace Squidex.Store.MongoDb.History
         [BsonElement]
         public Guid AppId { get; set; }
 
+        [BsonRequired]
+        [BsonElement]
+        public int SessionEventIndex { get; set; }
+
         [BsonRequired]
         [BsonElement]
         public string Channel { get; set; }

src/Squidex.Store.MongoDb/History/MongoHistoryEventRepository.cs

@@ -9,10 +9,12 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Threading;
 using System.Threading.Tasks;
 using MongoDB.Driver;
 using Squidex.Infrastructure.CQRS;
 using Squidex.Infrastructure.CQRS.Events;
+using Squidex.Infrastructure.CQRS.Replay;
 using Squidex.Infrastructure.MongoDb;
 using Squidex.Read.History;
 using Squidex.Read.History.Repositories;
@@ -20,10 +22,11 @@ using Squidex.Store.MongoDb.Utils;
 
 namespace Squidex.Store.MongoDb.History
 {
-    public class MongoHistoryEventRepository : MongoRepositoryBase<MongoHistoryEventEntity>, IHistoryEventRepository, ICatchEventConsumer
+    public class MongoHistoryEventRepository : MongoRepositoryBase<MongoHistoryEventEntity>, IHistoryEventRepository, ICatchEventConsumer, IReplayableStore
     {
         private readonly List<IHistoryEventsCreator> creators;
         private readonly Dictionary<string, string> texts = new Dictionary<string, string>();
+        private int sessionEventCount;
 
         public MongoHistoryEventRepository(IMongoDatabase database, IEnumerable<IHistoryEventsCreator> creators) 
             : base(database)
@@ -47,15 +50,25 @@ namespace Squidex.Store.MongoDb.History
         protected override Task SetupCollectionAsync(IMongoCollection<MongoHistoryEventEntity> collection)
         {
             return Task.WhenAll(
-                collection.Indexes.CreateOneAsync(IndexKeys.Ascending(x => x.AppId)),
-                collection.Indexes.CreateOneAsync(IndexKeys.Ascending(x => x.Channel)),
+                collection.Indexes.CreateOneAsync(
+                    IndexKeys
+                        .Ascending(x => x.AppId)
+                        .Ascending(x => x.Channel)
+                        .Descending(x => x.Created)
+                        .Descending(x => x.SessionEventIndex)),
                 collection.Indexes.CreateOneAsync(IndexKeys.Ascending(x => x.Created), new CreateIndexOptions { ExpireAfter = TimeSpan.FromDays(365) }));
         }
 
+        public Task ClearAsync()
+        {
+            return TryDropCollectionAsync();
+        }
+
         public async Task<List<IHistoryEventEntity>> QueryEventsByChannel(Guid appId, string channelPrefix, int count)
         {
             var entities =
-                await Collection.Find(x => x.AppId == appId && x.Channel.StartsWith(channelPrefix)).SortByDescending(x => x.Created).Limit(count).ToListAsync();
+                await Collection.Find(x => x.AppId == appId && x.Channel.StartsWith(channelPrefix))
+                    .SortByDescending(x => x.Created).ThenByDescending(x => x.SessionEventIndex).Limit(count).ToListAsync();
 
             return entities.Select(x => (IHistoryEventEntity)new ParsedHistoryEvent(x, texts)).ToList();
         }
@@ -70,6 +83,8 @@ namespace Squidex.Store.MongoDb.History
                 {
                     await Collection.CreateAsync(@event.Headers, x =>
                     {
+                        x.SessionEventIndex = Interlocked.Increment(ref sessionEventCount);
+
                         x.Channel = message.Channel;
                         x.Message = message.Message;
 

src/Squidex.Store.MongoDb/MongoDbModule.cs

@@ -13,6 +13,7 @@ using Microsoft.AspNetCore.Identity.MongoDB;
 using Microsoft.Extensions.Options;
 using MongoDB.Driver;
 using Squidex.Infrastructure.CQRS.Events;
+using Squidex.Infrastructure.CQRS.Replay;
 using Squidex.Infrastructure.MongoDb;
 using Squidex.Read.Apps.Repositories;
 using Squidex.Read.History.Repositories;
@@ -72,16 +73,19 @@ namespace Squidex.Store.MongoDb
             builder.RegisterType<MongoHistoryEventRepository>()
                 .As<IHistoryEventRepository>()
                 .As<ICatchEventConsumer>()
+                .As<IReplayableStore>()
                 .SingleInstance();
 
             builder.RegisterType<MongoSchemaRepository>()
                 .As<ISchemaRepository>()
                 .As<ICatchEventConsumer>()
+                .As<IReplayableStore>()
                 .SingleInstance();
 
             builder.RegisterType<MongoAppRepository>()
                 .As<IAppRepository>()
                 .As<ICatchEventConsumer>()
+                .As<IReplayableStore>()
                 .SingleInstance();
         }
     }

src/Squidex.Store.MongoDb/Schemas/MongoSchemaRepository.cs

@@ -14,9 +14,11 @@ using MongoDB.Driver;
 using Squidex.Core.Schemas;
 using Squidex.Core.Schemas.Json;
 using Squidex.Events.Schemas;
+using Squidex.Events.Schemas.Utils;
 using Squidex.Infrastructure;
 using Squidex.Infrastructure.CQRS;
 using Squidex.Infrastructure.CQRS.Events;
+using Squidex.Infrastructure.CQRS.Replay;
 using Squidex.Infrastructure.Dispatching;
 using Squidex.Infrastructure.MongoDb;
 using Squidex.Infrastructure.Reflection;
@@ -25,20 +27,20 @@ using Squidex.Store.MongoDb.Utils;
 
 namespace Squidex.Store.MongoDb.Schemas
 {
-    public  class MongoSchemaRepository : MongoRepositoryBase<MongoSchemaEntity>, ISchemaRepository, ICatchEventConsumer
+    public  class MongoSchemaRepository : MongoRepositoryBase<MongoSchemaEntity>, ISchemaRepository, ICatchEventConsumer, IReplayableStore
     {
         private readonly SchemaJsonSerializer serializer;
-        private readonly FieldRegistry fieldRegistry;
+        private readonly FieldRegistry registry;
 
-        public MongoSchemaRepository(IMongoDatabase database, SchemaJsonSerializer serializer, FieldRegistry fieldRegistry)
+        public MongoSchemaRepository(IMongoDatabase database, SchemaJsonSerializer serializer, FieldRegistry registry)
             : base(database)
         {
             Guard.NotNull(serializer, nameof(serializer));
-            Guard.NotNull(fieldRegistry, nameof(fieldRegistry));
+            Guard.NotNull(registry, nameof(registry));
 
             this.serializer = serializer;
 
-            this.fieldRegistry = fieldRegistry;
+            this.registry = registry;
         }
 
         protected override string CollectionName()
@@ -51,6 +53,11 @@ namespace Squidex.Store.MongoDb.Schemas
             return collection.Indexes.CreateOneAsync(IndexKeys.Ascending(x => x.Name));
         }
 
+        public Task ClearAsync()
+        {
+            return TryDropCollectionAsync();
+        }
+
         public async Task<IReadOnlyList<ISchemaEntity>> QueryAllAsync(Guid appId)
         {
             var entities = await Collection.Find(s => s.AppId == appId && !s.IsDeleted).ToListAsync();
@@ -96,54 +103,52 @@ namespace Squidex.Store.MongoDb.Schemas
 
         protected Task On(FieldDeleted @event, EnvelopeHeaders headers)
         {
-            return UpdateSchema(headers, s => s.DeleteField(@event.FieldId));
+            return UpdateSchema(headers, s => SchemaEventDispatcher.Dispatch(@event, s));
         }
 
         protected Task On(FieldDisabled @event, EnvelopeHeaders headers)
         {
-            return UpdateSchema(headers, s => s.DisableField(@event.FieldId));
+            return UpdateSchema(headers, s => SchemaEventDispatcher.Dispatch(@event, s));
         }
 
         protected Task On(FieldEnabled @event, EnvelopeHeaders headers)
         {
-            return UpdateSchema(headers, s => s.EnableField(@event.FieldId));
+            return UpdateSchema(headers, s => SchemaEventDispatcher.Dispatch(@event, s));
         }
 
         protected Task On(FieldHidden @event, EnvelopeHeaders headers)
         {
-            return UpdateSchema(headers, s => s.HideField(@event.FieldId));
+            return UpdateSchema(headers, s => SchemaEventDispatcher.Dispatch(@event, s));
         }
 
         protected Task On(FieldShown @event, EnvelopeHeaders headers)
         {
-            return UpdateSchema(headers, s => s.ShowField(@event.FieldId));
+            return UpdateSchema(headers, s => SchemaEventDispatcher.Dispatch(@event, s));
         }
 
         protected Task On(FieldUpdated @event, EnvelopeHeaders headers)
         {
-            return UpdateSchema(headers, s => s.UpdateField(@event.FieldId, @event.Properties));
+            return UpdateSchema(headers, s => SchemaEventDispatcher.Dispatch(@event, s));
         }
 
         protected Task On(SchemaUpdated @event, EnvelopeHeaders headers)
         {
-            return UpdateSchema(headers, s => s.Update(@event.Properties));
+            return UpdateSchema(headers, s => SchemaEventDispatcher.Dispatch(@event, s));
         }
 
         protected Task On(SchemaPublished @event, EnvelopeHeaders headers)
         {
-            return UpdateSchema(headers, s => s.Publish());
+            return UpdateSchema(headers, s => SchemaEventDispatcher.Dispatch(@event, s));
         }
 
         protected Task On(SchemaUnpublished @event, EnvelopeHeaders headers)
         {
-            return UpdateSchema(headers, s => s.Unpublish());
+            return UpdateSchema(headers, s => SchemaEventDispatcher.Dispatch(@event, s));
         }
 
         protected Task On(FieldAdded @event, EnvelopeHeaders headers)
         {
-            var field = fieldRegistry.CreateField(@event.FieldId, @event.Name, @event.Properties);
-
-            return UpdateSchema(headers, s => s.AddOrUpdateField(field));
+            return UpdateSchema(headers, s => SchemaEventDispatcher.Dispatch(@event, s, registry));
         }
 
         protected Task On(SchemaCreated @event, EnvelopeHeaders headers)

src/Squidex.Write/Schemas/SchemaCommandHandler.cs

@@ -32,7 +32,7 @@ namespace Squidex.Write.Schemas
 
         protected async Task On(CreateSchema command, CommandContext context)
         {
-            if (await schemas.FindSchemaIdByNameAsync(command.AppId, command.Name) != null)
+            if (await schemas.ProvideSchemaByNameAsync(command.AppId, command.Name) != null)
             {
                 var error = 
                     new ValidationError($"A schema with name '{command.Name}' already exists", "DisplayName", 

src/Squidex.Write/Schemas/SchemaDomainObject.cs

@@ -9,6 +9,7 @@
 using System;
 using Squidex.Core.Schemas;
 using Squidex.Events.Schemas;
+using Squidex.Events.Schemas.Utils;
 using Squidex.Infrastructure;
 using Squidex.Infrastructure.CQRS;
 using Squidex.Infrastructure.CQRS.Events;
@@ -47,57 +48,57 @@ namespace Squidex.Write.Schemas
         {
             totalFields++;
 
-            schema = schema.AddOrUpdateField(registry.CreateField(@event.FieldId, @event.Name, @event.Properties));
+            schema = SchemaEventDispatcher.Dispatch(@event, schema, registry);
         }
 
         protected void On(SchemaCreated @event)
         {
-            schema = Schema.Create(@event.Name, @event.Properties);
+            schema = SchemaEventDispatcher.Dispatch(@event);
         }
 
         protected void On(FieldUpdated @event)
         {
-            schema = schema.UpdateField(@event.FieldId, @event.Properties);
+            schema = SchemaEventDispatcher.Dispatch(@event, schema);
         }
 
         protected void On(FieldHidden @event)
         {
-            schema = schema.HideField(@event.FieldId);
+            schema = SchemaEventDispatcher.Dispatch(@event, schema);
         }
 
         protected void On(FieldShown @event)
         {
-            schema = schema.ShowField(@event.FieldId);
+            schema = SchemaEventDispatcher.Dispatch(@event, schema);
         }
 
         protected void On(FieldDisabled @event)
         {
-            schema = schema.DisableField(@event.FieldId);
+            schema = SchemaEventDispatcher.Dispatch(@event, schema);
         }
 
         protected void On(FieldEnabled @event)
         {
-            schema = schema.EnableField(@event.FieldId);
+            schema = SchemaEventDispatcher.Dispatch(@event, schema);
         }
 
         protected void On(SchemaUpdated @event)
         {
-            schema = schema.Update(@event.Properties);
+            schema = SchemaEventDispatcher.Dispatch(@event, schema);
         }
 
         protected void On(FieldDeleted @event)
         {
-            schema = schema.DeleteField(@event.FieldId);
+            schema = SchemaEventDispatcher.Dispatch(@event, schema);
         }
 
         protected void On(SchemaPublished @event)
         {
-            schema = schema.Publish();
+            schema = SchemaEventDispatcher.Dispatch(@event, schema);
         }
 
         protected void On(SchemaUnpublished @event)
         {
-            schema = schema.Unpublish();
+            schema = SchemaEventDispatcher.Dispatch(@event, schema);
         }
 
         protected void On(SchemaDeleted @event)

src/Squidex/Config/Domain/InfrastructureModule.cs

@@ -14,6 +14,7 @@ using Squidex.Core.Schemas.Json;
 using Squidex.Infrastructure.CQRS.Autofac;
 using Squidex.Infrastructure.CQRS.Commands;
 using Squidex.Infrastructure.CQRS.Events;
+using Squidex.Infrastructure.CQRS.Replay;
 
 namespace Squidex.Config.Domain
 {
@@ -45,7 +46,11 @@ namespace Squidex.Config.Domain
                 .As<ICommandBus>()
                 .SingleInstance();
 
-            builder.RegisterType<EventBus>()
+            builder.RegisterType<ReplayGenerator>()
+                .AsSelf()
+                .SingleInstance();
+
+            builder.RegisterType<EventReceiver>()
                 .AsSelf()
                 .SingleInstance();
 

src/Squidex/Config/Domain/ReadModule.cs

@@ -8,8 +8,11 @@
 
 using Autofac;
 using Squidex.Infrastructure.CQRS.Events;
+using Squidex.Read.Apps;
 using Squidex.Read.Apps.Services;
 using Squidex.Read.Apps.Services.Implementations;
+using Squidex.Read.History;
+using Squidex.Read.Schemas;
 using Squidex.Read.Schemas.Services;
 using Squidex.Read.Schemas.Services.Implementations;
 
@@ -21,12 +24,20 @@ namespace Squidex.Config.Domain
         {
             builder.RegisterType<CachingAppProvider>()
                 .As<IAppProvider>()
-                .As<ILiveEventConsumer>()
+                .As<ICatchEventConsumer>()
                 .SingleInstance();
 
             builder.RegisterType<CachingSchemaProvider>()
                 .As<ISchemaProvider>()
-                .As<ILiveEventConsumer>()
+                .As<ICatchEventConsumer>()
+                .SingleInstance();
+
+            builder.RegisterType<AppHistoryEventsCreator>()
+                .As<IHistoryEventsCreator>()
+                .SingleInstance();
+
+            builder.RegisterType<SchemaHistoryEventsCreator>()
+                .As<IHistoryEventsCreator>()
                 .SingleInstance();
         }
     }

src/Squidex/Config/EventStore/EventStoreUsage.cs

@@ -16,7 +16,7 @@ namespace Squidex.Config.EventStore
     {
         public static IApplicationBuilder UseMyEventStore(this IApplicationBuilder app)
         {
-            app.ApplicationServices.GetService<EventBus>().Subscribe();
+            app.ApplicationServices.GetService<EventReceiver>().Subscribe();
 
             return app;
         }

src/Squidex/Pipeline/CommandHandlers/EnrichWithSchemaAggregateIdHandler.cs

@@ -53,14 +53,14 @@ namespace Squidex.Pipeline.CommandHandlers
             {
                 var schemaName = routeValues["name"].ToString();
 
-                var id = await schemaProvider.FindSchemaIdByNameAsync(appCommand.AppId, schemaName);
+                var schema = await schemaProvider.ProvideSchemaByNameAsync(appCommand.AppId, schemaName);
 
-                if (!id.HasValue)
+                if (schema == null)
                 {
                     throw new DomainObjectNotFoundException(schemaName, typeof(SchemaDomainObject));
                 }
 
-                aggregateCommand.AggregateId = id.Value;
+                aggregateCommand.AggregateId = schema.Id;
             }
 
             return false;

src/Squidex/Program.cs

@@ -8,6 +8,8 @@
 
 using System.IO;
 using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.DependencyInjection;
+using Squidex.Infrastructure.CQRS.Replay;
 
 namespace Squidex
 {
@@ -22,7 +24,14 @@ namespace Squidex
                 .UseStartup<Startup>()
                 .Build();
 
-            host.Run();
+            if (args.Length == 1 && args[0] == "--replay")
+            {
+                host.Services.GetService<ReplayGenerator>().ReplayAllAsync().Wait();
+            }
+            else
+            {
+                host.Run();
+            }
         }
     }
 }

src/Squidex/app-config/clean-css-loader.js

@@ -9,14 +9,14 @@ function cleanCss(css) {
 
     new CleanCSS().minify(css, function (err, minified) {
         if (err) {
-            if (Array.isArray(err) && (err[0] != null)) {
+            if (Array.isArray(err) && (err[0] !== null)) {
                 return callback(err[0]);
             } else {
                 return callback(err);
             }
         }
         var warnings;
-        if (((warnings = minified.warnings) != null ? warnings.length : void 0) !== 0) {
+        if (((warnings = minified.warnings) !== null ? warnings.length : void 0) !== 0) {
             warnings.forEach(function (msg) {
                 loader.emitWarning(msg.toString());
             });

src/Squidex/app/shared/services/users-provider.service.ts

@@ -31,12 +31,6 @@ export class UsersProviderService {
                     .catch(err => {
                         return Observable.of(new UserDto('NOT FOUND', 'NOT FOUND', 'NOT FOUND', ''));
                     })
-                    .map(dto => {
-                        if (this.authService.user && dto.id === this.authService.user.id) {
-                            dto = new UserDto(dto.id, dto.email, me, dto.pictureUrl);
-                        }
-                        return dto;
-                    })
                     .publishLast();
 
             request.connect();
@@ -44,6 +38,12 @@ export class UsersProviderService {
             result = this.caches[id] = request;
         }
 
-        return result;
+        return result
+            .map(dto => {
+                if (this.authService.user && dto.id === this.authService.user.id) {
+                    dto = new UserDto(dto.id, dto.email, me, dto.pictureUrl);
+                }
+                return dto;
+            });
     }
 }

tests/Squidex.Write.Tests/Schemas/SchemaCommandHandlerTests.cs

@@ -13,6 +13,7 @@ using Moq;
 using Squidex.Core.Schemas;
 using Squidex.Infrastructure;
 using Squidex.Infrastructure.CQRS.Commands;
+using Squidex.Read.Schemas.Repositories;
 using Squidex.Read.Schemas.Services;
 using Squidex.Write.Schemas.Commands;
 using Squidex.Write.Utils;
@@ -50,7 +51,7 @@ namespace Squidex.Write.Schemas
             var command = new CreateSchema { Name = schemaName, AppId = appId, AggregateId = Id };
             var context = new CommandContext(command);
 
-            schemaProvider.Setup(x => x.FindSchemaIdByNameAsync(appId, schemaName)).Returns(Task.FromResult<Guid?>(Guid.NewGuid())).Verifiable();
+            schemaProvider.Setup(x => x.ProvideSchemaByNameAsync(appId, schemaName)).Returns(Task.FromResult(new Mock<ISchemaEntityWithSchema>().Object)).Verifiable();
 
             await TestCreate(schema, async _ =>
             {
@@ -66,7 +67,7 @@ namespace Squidex.Write.Schemas
             var command = new CreateSchema { Name = schemaName, AppId = appId, AggregateId = Id };
             var context = new CommandContext(command);
 
-            schemaProvider.Setup(x => x.FindSchemaIdByNameAsync(Id, schemaName)).Returns(Task.FromResult<Guid?>(null)).Verifiable();
+            schemaProvider.Setup(x => x.ProvideSchemaByNameAsync(Id, schemaName)).Returns(Task.FromResult<ISchemaEntityWithSchema>(null)).Verifiable();
 
             await TestCreate(schema, async _ =>
             {