NSwag fixew.

src/Squidex.Domain.Apps.Read/Rules/Orleans/Grains/IRuleDequeuerGrain.cs

@@ -1,21 +0,0 @@
-// ==========================================================================
-//  IRuleDequeuerGrain.cs
-//  Squidex Headless CMS
-// ==========================================================================
-//  Copyright (c) Squidex Group
-//  All rights reserved.
-// ==========================================================================
-
-using System.Threading.Tasks;
-using Orleans;
-using Orleans.Concurrency;
-
-namespace Squidex.Domain.Apps.Read.Rules.Orleans.Grains
-{
-    public interface IRuleDequeuerGrain : IGrainWithStringKey
-    {
-        Task ActivateAsync();
-
-        Task HandleAsync(Immutable<IRuleEventEntity> @event);
-    }
-}

src/Squidex.Domain.Apps.Read/Rules/Orleans/RuleDequeuerBootstrap.cs

@@ -1,32 +0,0 @@
-// ==========================================================================
-//  RuleDequeuerBootstrap.cs
-//  Squidex Headless CMS
-// ==========================================================================
-//  Copyright (c) Squidex Group
-//  All rights reserved.
-// ==========================================================================
-
-using System.Threading.Tasks;
-using Orleans.Providers;
-using Squidex.Domain.Apps.Read.Rules.Orleans.Grains;
-using Squidex.Infrastructure.Tasks;
-
-namespace Squidex.Domain.Apps.Read.Rules.Orleans
-{
-    public sealed class RuleDequeuerBootstrap : IBootstrapProvider
-    {
-        public string Name { get; private set; }
-
-        public Task Init(string name, IProviderRuntime providerRuntime, IProviderConfiguration config)
-        {
-            var grain = providerRuntime.GrainFactory.GetGrain<IRuleDequeuerGrain>("Default");
-
-            return grain.ActivateAsync();
-        }
-
-        public Task Close()
-        {
-            return TaskHelper.Done;
-        }
-    }
-}

src/Squidex.Domain.Apps.Read/Rules/Orleans/Grains/Implementation/RuleDequeuerGrain.cs → src/Squidex.Domain.Apps.Read/Rules/RuleDequeuer.cs

@@ -1,5 +1,5 @@
 // ==========================================================================
-//  RuleDequeuerGrain.cs
+//  RuleDequeuer.cs
 //  Squidex Headless CMS
 // ==========================================================================
 //  Copyright (c) Squidex Group
@@ -7,41 +7,31 @@
 // ==========================================================================
 
 using System;
-using System.Collections.Generic;
+using System.Collections.Concurrent;
+using System.Threading;
 using System.Threading.Tasks;
+using System.Threading.Tasks.Dataflow;
 using NodaTime;
-using Orleans;
-using Orleans.Concurrency;
-using Orleans.Core;
-using Orleans.Runtime;
 using Squidex.Domain.Apps.Core.HandleRules;
 using Squidex.Domain.Apps.Core.Rules;
 using Squidex.Domain.Apps.Read.Rules.Repositories;
 using Squidex.Infrastructure;
 using Squidex.Infrastructure.Log;
-using Squidex.Infrastructure.Tasks;
+using Squidex.Infrastructure.Timers;
 
-namespace Squidex.Domain.Apps.Read.Rules.Orleans.Grains.Implementation
+namespace Squidex.Domain.Apps.Read.Rules
 {
-    [Reentrant]
-    public class RuleDequeuerGrain : Grain, IRuleDequeuerGrain, IRemindable
+    public sealed class RuleDequeuer : DisposableObjectBase, IExternalSystem
     {
+        private readonly ActionBlock<IRuleEventEntity> requestBlock;
         private readonly IRuleEventRepository ruleEventRepository;
         private readonly RuleService ruleService;
+        private readonly CompletionTimer timer;
+        private readonly ConcurrentDictionary<Guid, bool> executing = new ConcurrentDictionary<Guid, bool>();
         private readonly IClock clock;
         private readonly ISemanticLog log;
-        private readonly HashSet<Guid> executing = new HashSet<Guid>();
-        private TaskFactory scheduler;
 
-        public RuleDequeuerGrain(RuleService ruleService, IRuleEventRepository ruleEventRepository, ISemanticLog log, IClock clock)
-            : this(ruleService, ruleEventRepository, log, clock, null, null)
-        {
-        }
-
-        protected RuleDequeuerGrain(RuleService ruleService, IRuleEventRepository ruleEventRepository, ISemanticLog log, IClock clock,
-            IGrainIdentity identity,
-            IGrainRuntime runtime)
-            : base(identity, runtime)
+        public RuleDequeuer(RuleService ruleService, IRuleEventRepository ruleEventRepository, ISemanticLog log, IClock clock)
         {
             Guard.NotNull(ruleEventRepository, nameof(ruleEventRepository));
             Guard.NotNull(ruleService, nameof(ruleService));
@@ -54,42 +44,41 @@ namespace Squidex.Domain.Apps.Read.Rules.Orleans.Grains.Implementation
             this.clock = clock;
 
             this.log = log;
-        }
 
-        public override Task OnActivateAsync()
-        {
-            scheduler = new TaskFactory(TaskScheduler.Current ?? TaskScheduler.Default);
+            requestBlock =
+                new ActionBlock<IRuleEventEntity>(HandleAsync,
+                    new ExecutionDataflowBlockOptions { MaxDegreeOfParallelism = 32, BoundedCapacity = 32 });
 
-            DelayDeactivation(TimeSpan.FromDays(1));
+            timer = new CompletionTimer(5000, QueryAsync);
+        }
 
-            RegisterOrUpdateReminder("Default", TimeSpan.Zero, TimeSpan.FromMinutes(10));
-            RegisterTimer(x => QueryAsync(), null, TimeSpan.Zero, TimeSpan.FromSeconds(2));
+        protected override void DisposeObject(bool disposing)
+        {
+            if (disposing)
+            {
+                timer.StopAsync().Wait();
 
-            return base.OnActivateAsync();
+                requestBlock.Complete();
+                requestBlock.Completion.Wait();
+            }
         }
 
-        public Task ReceiveReminder(string reminderName, TickStatus status)
+        public void Connect()
         {
-            return TaskHelper.Done;
         }
 
-        public Task ActivateAsync()
+        public void Next()
         {
-            return TaskHelper.Done;
+            timer.SkipCurrentDelay();
         }
 
-        public async Task QueryAsync()
+        private async Task QueryAsync(CancellationToken cancellationToken)
         {
             try
             {
-                var self = GetSelf();
-
-                await ruleEventRepository.QueryPendingAsync(clock.GetCurrentInstant(), x =>
-                {
-                    scheduler.StartNew(() => self.HandleAsync(x.AsImmutable()).Forget()).Forget();
+                var now = clock.GetCurrentInstant();
 
-                    return TaskHelper.Done;
-                });
+                await ruleEventRepository.QueryPendingAsync(now, requestBlock.SendAsync, cancellationToken);
             }
             catch (Exception ex)
             {
@@ -99,23 +88,23 @@ namespace Squidex.Domain.Apps.Read.Rules.Orleans.Grains.Implementation
             }
         }
 
-        public async Task HandleAsync(Immutable<IRuleEventEntity> @event)
+        public async Task HandleAsync(IRuleEventEntity @event)
         {
-            if (!executing.Add(@event.Value.Id))
+            if (!executing.TryAdd(@event.Id, false))
             {
                 return;
             }
 
             try
             {
-                var job = @event.Value.Job;
+                var job = @event.Job;
 
                 var response = await ruleService.InvokeAsync(job.ActionName, job.ActionData);
 
                 var jobInvoke = ComputeJobInvoke(response.Result, @event, job);
                 var jobResult = ComputeJobResult(response.Result, jobInvoke);
 
-                await ruleEventRepository.MarkSentAsync(@event.Value.Id, response.Dump, response.Result, jobResult, response.Elapsed, jobInvoke);
+                await ruleEventRepository.MarkSentAsync(@event.Id, response.Dump, response.Result, jobResult, response.Elapsed, jobInvoke);
             }
             catch (Exception ex)
             {
@@ -125,7 +114,7 @@ namespace Squidex.Domain.Apps.Read.Rules.Orleans.Grains.Implementation
             }
             finally
             {
-                executing.Remove(@event.Value.Id);
+                executing.TryRemove(@event.Id, out var value);
             }
         }
 
@@ -145,11 +134,11 @@ namespace Squidex.Domain.Apps.Read.Rules.Orleans.Grains.Implementation
             }
         }
 
-        private static Instant? ComputeJobInvoke(RuleResult result, Immutable<IRuleEventEntity> @event, RuleJob job)
+        private static Instant? ComputeJobInvoke(RuleResult result, IRuleEventEntity @event, RuleJob job)
         {
             if (result != RuleResult.Success)
             {
-                switch (@event.Value.NumCalls)
+                switch (@event.NumCalls)
                 {
                     case 0:
                         return job.Created.Plus(Duration.FromMinutes(5));
@@ -164,10 +153,5 @@ namespace Squidex.Domain.Apps.Read.Rules.Orleans.Grains.Implementation
 
             return null;
         }
-
-        protected virtual IRuleDequeuerGrain GetSelf()
-        {
-            return this.AsReference<IRuleDequeuerGrain>();
-        }
     }
 }

src/Squidex.Domain.Apps.Read/Squidex.Domain.Apps.Read.csproj

@@ -15,9 +15,6 @@
   <ItemGroup>
     <PackageReference Include="GraphQL" Version="0.17.3" />
     <PackageReference Include="Microsoft.Extensions.Caching.Memory" Version="2.0.0" />
-    <PackageReference Include="Microsoft.Orleans.Client" Version="2.0.0-beta1" />
-    <PackageReference Include="Microsoft.Orleans.Core" Version="2.0.0-beta1" />
-    <PackageReference Include="Microsoft.Orleans.OrleansCodeGenerator.Build" Version="2.0.0-beta1-fix" />
     <PackageReference Include="NodaTime" Version="2.2.3" />
     <PackageReference Include="RefactoringEssentials" Version="5.4.0" />
     <PackageReference Include="StyleCop.Analyzers" Version="1.0.2" />

src/Squidex.Domain.Apps.Read/State/AppProvider.cs

@@ -0,0 +1,89 @@
+// ==========================================================================
+//  AppProvider.cs
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex Group
+//  All rights reserved.
+// ==========================================================================
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Squidex.Domain.Apps.Read.Apps;
+using Squidex.Domain.Apps.Read.Rules;
+using Squidex.Domain.Apps.Read.Schemas;
+using Squidex.Domain.Apps.Read.State.Orleans.Grains;
+using Squidex.Infrastructure;
+using Squidex.Infrastructure.States;
+
+namespace Squidex.Domain.Apps.Read.State.Orleans
+{
+    public sealed class AppProvider : IAppProvider
+    {
+        private readonly IStateFactory factory;
+
+        public AppProvider(IStateFactory factory)
+        {
+            Guard.NotNull(factory, nameof(factory));
+
+            this.factory = factory;
+        }
+
+        public async Task<IAppEntity> GetAppAsync(string appName)
+        {
+            var app = await factory.GetAsync<AppStateGrain, AppStateGrainState>(appName);
+
+            return await app.GetAppAsync();
+        }
+
+        public async Task<(IAppEntity, ISchemaEntity)> GetAppWithSchemaAsync(string appName, Guid id)
+        {
+            var app = await factory.GetAsync<AppStateGrain, AppStateGrainState>(appName);
+
+            return await app.GetAppWithSchemaAsync(id);
+        }
+
+        public async Task<List<IRuleEntity>> GetRulesAsync(string appName)
+        {
+            var app = await factory.GetAsync<AppStateGrain, AppStateGrainState>(appName);
+
+            return await app.GetRulesAsync();
+        }
+
+        public async Task<ISchemaEntity> GetSchemaAsync(string appName, Guid id, bool provideDeleted = false)
+        {
+            var app = await factory.GetAsync<AppStateGrain, AppStateGrainState>(appName);
+
+            return await app.GetSchemaAsync(id, provideDeleted);
+        }
+
+        public async Task<ISchemaEntity> GetSchemaAsync(string appName, string name, bool provideDeleted = false)
+        {
+            var app = await factory.GetAsync<AppStateGrain, AppStateGrainState>(appName);
+
+            return await app.GetSchemaAsync(name, provideDeleted);
+        }
+
+        public async Task<List<ISchemaEntity>> GetSchemasAsync(string appName)
+        {
+            var app = await factory.GetAsync<AppStateGrain, AppStateGrainState>(appName);
+
+            return await app.GetSchemasAsync();
+        }
+
+        public async Task<List<IAppEntity>> GetUserApps(string userId)
+        {
+            var appUser = await factory.GetAsync<AppUserGrain, AppUserGrainState>(userId);
+            var appNames = await appUser.GetAppNamesAsync();
+
+            var tasks =
+                appNames
+                    .Select(x => GetAppAsync(x));
+
+            var apps = await Task.WhenAll(tasks);
+
+            return apps.Where(a => a != null).ToList();
+        }
+    }
+}

src/Squidex.Domain.Apps.Read/State/Orleans/AppStateEventConsumer.cs → src/Squidex.Domain.Apps.Read/State/AppStateEventConsumer.cs

@@ -7,20 +7,19 @@
 // ==========================================================================
 
 using System.Threading.Tasks;
-using Orleans;
 using Squidex.Domain.Apps.Events;
 using Squidex.Domain.Apps.Events.Apps;
 using Squidex.Domain.Apps.Read.State.Orleans.Grains;
 using Squidex.Infrastructure;
 using Squidex.Infrastructure.CQRS.Events;
-using Squidex.Infrastructure.Json.Orleans;
+using Squidex.Infrastructure.States;
 using Squidex.Infrastructure.Tasks;
 
 namespace Squidex.Domain.Apps.Read.State.Orleans
 {
     public sealed class AppStateEventConsumer : IEventConsumer
     {
-        private readonly IGrainFactory factory;
+        private readonly IStateFactory factory;
 
         public string Name
         {
@@ -32,7 +31,7 @@ namespace Squidex.Domain.Apps.Read.State.Orleans
             get { return @"(^app-)|(^schema-)|(^rule\-)"; }
         }
 
-        public AppStateEventConsumer(IGrainFactory factory)
+        public AppStateEventConsumer(IStateFactory factory)
         {
             Guard.NotNull(factory, nameof(factory));
 
@@ -48,21 +47,21 @@ namespace Squidex.Domain.Apps.Read.State.Orleans
         {
             if (@event.Payload is AppEvent appEvent)
             {
-                var appGrain = factory.GetGrain<IAppStateGrain>(appEvent.AppId.Name);
+                var appGrain = await factory.GetAsync<AppStateGrain, AppStateGrainState>(appEvent.AppId.Name);
 
-                await appGrain.HandleAsync(@event.AsJ());
+                await appGrain.HandleAsync(@event);
             }
 
             if (@event.Payload is AppContributorAssigned contributorAssigned)
             {
-                var userGrain = factory.GetGrain<IAppUserGrain>(contributorAssigned.ContributorId);
+                var userGrain = await factory.GetAsync<AppUserGrain, AppUserGrainState>(contributorAssigned.ContributorId);
 
                 await userGrain.AddAppAsync(contributorAssigned.AppId.Name);
             }
 
             if (@event.Payload is AppContributorRemoved contributorRemoved)
             {
-                var userGrain = factory.GetGrain<IAppUserGrain>(contributorRemoved.ContributorId);
+                var userGrain = await factory.GetAsync<AppUserGrain, AppUserGrainState>(contributorRemoved.ContributorId);
 
                 await userGrain.RemoveAppAsync(contributorRemoved.AppId.Name);
             }

src/Squidex.Domain.Apps.Read/State/Grains/AppStateGrain.cs

@@ -0,0 +1,135 @@
+// ==========================================================================
+//  AppStateGrain.cs
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex Group
+//  All rights reserved.
+// ==========================================================================
+
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using Squidex.Domain.Apps.Core.Schemas;
+using Squidex.Domain.Apps.Events.Apps;
+using Squidex.Domain.Apps.Read.Apps;
+using Squidex.Domain.Apps.Read.Rules;
+using Squidex.Domain.Apps.Read.Schemas;
+using Squidex.Infrastructure;
+using Squidex.Infrastructure.CQRS.Events;
+using Squidex.Infrastructure.States;
+using Squidex.Infrastructure.Tasks;
+
+namespace Squidex.Domain.Apps.Read.State.Orleans.Grains
+{
+    public class AppStateGrain : StatefulObject<AppStateGrainState>
+    {
+        private readonly FieldRegistry fieldRegistry;
+        private readonly SingleThreadedDispatcher dispatcher = new SingleThreadedDispatcher();
+        private Exception exception;
+
+        public AppStateGrain(FieldRegistry fieldRegistry)
+        {
+            Guard.NotNull(fieldRegistry, nameof(fieldRegistry));
+
+            this.fieldRegistry = fieldRegistry;
+        }
+
+        public override async Task ReadStateAsync()
+        {
+            try
+            {
+                await base.ReadStateAsync();
+            }
+            catch (Exception ex)
+            {
+                exception = ex;
+
+                State = new AppStateGrainState();
+            }
+
+            State.SetRegistry(fieldRegistry);
+        }
+
+        public virtual Task<(IAppEntity, ISchemaEntity)> GetAppWithSchemaAsync(Guid id)
+        {
+            return dispatcher.DispatchAndUnwrapAsync(() =>
+            {
+                var schema = State.FindSchema(x => x.Id == id && !x.IsDeleted);
+
+                return Task.FromResult((State.GetApp(), schema));
+            });
+        }
+
+        public virtual Task<IAppEntity> GetAppAsync()
+        {
+            return dispatcher.DispatchAndUnwrapAsync(() =>
+            {
+            var value = State.GetApp();
+
+            return Task.FromResult(value);
+            });
+        }
+
+        public virtual Task<List<IRuleEntity>> GetRulesAsync()
+        {
+            return dispatcher.DispatchAndUnwrapAsync(() =>
+            {
+                var value = State.FindRules();
+
+                return Task.FromResult(value);
+            });
+        }
+
+        public virtual Task<List<ISchemaEntity>> GetSchemasAsync()
+        {
+            return dispatcher.DispatchAndUnwrapAsync(() =>
+            {
+                var value = State.FindSchemas(x => !x.IsDeleted);
+
+                return Task.FromResult(value);
+            });
+        }
+
+        public virtual Task<ISchemaEntity> GetSchemaAsync(Guid id, bool provideDeleted = false)
+        {
+            return dispatcher.DispatchAndUnwrapAsync(() =>
+            {
+                var value = State.FindSchema(x => x.Id == id && (!x.IsDeleted || provideDeleted));
+
+                return Task.FromResult(value);
+            });
+        }
+
+        public virtual Task<ISchemaEntity> GetSchemaAsync(string name, bool provideDeleted = false)
+        {
+            return dispatcher.DispatchAndUnwrapAsync(() =>
+            {
+                var value = State.FindSchema(x => string.Equals(x.Name, name, StringComparison.OrdinalIgnoreCase) && (!x.IsDeleted || provideDeleted));
+
+                return Task.FromResult(value);
+            });
+        }
+
+        public virtual Task HandleAsync(Envelope<IEvent> message)
+        {
+            return dispatcher.DispatchAndUnwrapAsync(() =>
+            {
+                if (exception != null)
+                {
+                    if (message.Payload is AppCreated)
+                    {
+                        exception = null;
+                    }
+                    else
+                    {
+                        throw exception;
+                    }
+                }
+
+                State.Apply(message);
+
+                return WriteStateAsync();
+            });
+        }
+    }
+}

src/Squidex.Domain.Apps.Read/State/Orleans/Grains/Implementations/AppStateGrainState.cs → src/Squidex.Domain.Apps.Read/State/Grains/AppStateGrainState.cs

@@ -17,7 +17,7 @@ using Squidex.Domain.Apps.Read.Schemas;
 using Squidex.Infrastructure.CQRS.Events;
 using Squidex.Infrastructure.Dispatching;
 
-namespace Squidex.Domain.Apps.Read.State.Orleans.Grains.Implementations
+namespace Squidex.Domain.Apps.Read.State.Orleans.Grains
 {
     public sealed partial class AppStateGrainState
     {
@@ -44,17 +44,17 @@ namespace Squidex.Domain.Apps.Read.State.Orleans.Grains.Implementations
 
         public ISchemaEntity FindSchema(Func<JsonSchemaEntity, bool> filter)
         {
-            return Schemas.Values?.FirstOrDefault(filter);
+            return Schemas?.Values.FirstOrDefault(filter);
         }
 
-        public List<IRuleEntity> FindRules()
+        public List<ISchemaEntity> FindSchemas(Func<JsonSchemaEntity, bool> filter)
         {
-            return Rules.Values?.OfType<IRuleEntity>().ToList() ?? new List<IRuleEntity>();
+            return Schemas?.Values.Where(filter).OfType<ISchemaEntity>().ToList() ?? new List<ISchemaEntity>();
         }
 
-        public List<ISchemaEntity> FindSchemas(Func<JsonSchemaEntity, bool> filter)
+        public List<IRuleEntity> FindRules()
         {
-            return Schemas.Values?.Where(filter).OfType<ISchemaEntity>().ToList() ?? new List<ISchemaEntity>();
+            return Rules?.Values.OfType<IRuleEntity>().ToList() ?? new List<IRuleEntity>();
         }
 
         public void Reset()

src/Squidex.Domain.Apps.Read/State/Orleans/Grains/Implementations/AppStateGrainState_Apps.cs → src/Squidex.Domain.Apps.Read/State/Grains/AppStateGrainState_Apps.cs

@@ -15,7 +15,7 @@ using Squidex.Infrastructure;
 using Squidex.Infrastructure.CQRS.Events;
 using Squidex.Infrastructure.Reflection;
 
-namespace Squidex.Domain.Apps.Read.State.Orleans.Grains.Implementations
+namespace Squidex.Domain.Apps.Read.State.Orleans.Grains
 {
     public sealed partial class AppStateGrainState
     {

src/Squidex.Domain.Apps.Read/State/Orleans/Grains/Implementations/AppStateGrainState_Rules.cs → src/Squidex.Domain.Apps.Read/State/Grains/AppStateGrainState_Rules.cs

@@ -11,7 +11,7 @@ using Squidex.Domain.Apps.Events.Rules;
 using Squidex.Domain.Apps.Events.Rules.Utils;
 using Squidex.Infrastructure.CQRS.Events;
 
-namespace Squidex.Domain.Apps.Read.State.Orleans.Grains.Implementations
+namespace Squidex.Domain.Apps.Read.State.Orleans.Grains
 {
     public sealed partial class AppStateGrainState
     {

src/Squidex.Domain.Apps.Read/State/Orleans/Grains/Implementations/AppStateGrainState_Schemas.cs → src/Squidex.Domain.Apps.Read/State/Grains/AppStateGrainState_Schemas.cs

@@ -16,7 +16,7 @@ using Squidex.Infrastructure.Reflection;
 
 #pragma warning disable CS0612 // Type or member is obsolete
 
-namespace Squidex.Domain.Apps.Read.State.Orleans.Grains.Implementations
+namespace Squidex.Domain.Apps.Read.State.Orleans.Grains
 {
     public sealed partial class AppStateGrainState
     {

src/Squidex.Domain.Apps.Read/State/Grains/AppUserGrain.cs

@@ -0,0 +1,49 @@
+// ==========================================================================
+//  AppUserGrain.cs
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex Group
+//  All rights reserved.
+// ==========================================================================
+
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Squidex.Infrastructure.States;
+using Squidex.Infrastructure.Tasks;
+
+namespace Squidex.Domain.Apps.Read.State.Orleans.Grains
+{
+    public sealed class AppUserGrain : StatefulObject<AppUserGrainState>
+    {
+        private readonly SingleThreadedDispatcher dispatcher = new SingleThreadedDispatcher();
+
+        public Task AddAppAsync(string appName)
+        {
+            return dispatcher.DispatchAndUnwrapAsync(() =>
+            {
+                State.AppNames.Add(appName);
+
+                return WriteStateAsync();
+            });
+        }
+
+        public Task RemoveAppAsync(string appName)
+        {
+            return dispatcher.DispatchAndUnwrapAsync(() =>
+            {
+                State.AppNames.Remove(appName);
+
+                return WriteStateAsync();
+            });
+        }
+
+        public Task<List<string>> GetAppNamesAsync()
+        {
+            return dispatcher.DispatchAndUnwrapAsync(() =>
+            {
+                return Task.FromResult(State.AppNames.ToList());
+            });
+        }
+    }
+}

src/Squidex.Domain.Apps.Read/State/Orleans/Grains/Implementations/AppUserGrainState.cs → src/Squidex.Domain.Apps.Read/State/Grains/AppUserGrainState.cs

@@ -9,7 +9,7 @@
 using System.Collections.Generic;
 using Newtonsoft.Json;
 
-namespace Squidex.Domain.Apps.Read.State.Orleans.Grains.Implementations
+namespace Squidex.Domain.Apps.Read.State.Orleans.Grains
 {
     public sealed class AppUserGrainState
     {

src/Squidex.Domain.Apps.Read/State/Orleans/Grains/Implementations/JsonAppEntity.cs → src/Squidex.Domain.Apps.Read/State/Grains/JsonAppEntity.cs

@@ -7,13 +7,11 @@
 // ==========================================================================
 
 using Newtonsoft.Json;
-using Orleans.Concurrency;
 using Squidex.Domain.Apps.Core.Apps;
 using Squidex.Domain.Apps.Read.Apps;
 
-namespace Squidex.Domain.Apps.Read.State.Orleans.Grains.Implementations
+namespace Squidex.Domain.Apps.Read.State.Orleans.Grains
 {
-    [Immutable]
     public sealed class JsonAppEntity : JsonEntity<JsonAppEntity>, IAppEntity
     {
         [JsonProperty]

src/Squidex.Domain.Apps.Read/State/Orleans/Grains/Implementations/JsonEntity.cs → src/Squidex.Domain.Apps.Read/State/Grains/JsonEntity.cs

@@ -9,12 +9,10 @@
 using System;
 using Newtonsoft.Json;
 using NodaTime;
-using Orleans.Concurrency;
 using Squidex.Infrastructure;
 
-namespace Squidex.Domain.Apps.Read.State.Orleans.Grains.Implementations
+namespace Squidex.Domain.Apps.Read.State.Orleans.Grains
 {
-    [Immutable]
     public abstract class JsonEntity<T> : Cloneable<T>, IUpdateableEntityWithVersion where T : Cloneable
     {
         [JsonProperty]

src/Squidex.Domain.Apps.Read/State/Orleans/Grains/Implementations/JsonRuleEntity.cs → src/Squidex.Domain.Apps.Read/State/Grains/JsonRuleEntity.cs

@@ -8,14 +8,12 @@
 
 using System;
 using Newtonsoft.Json;
-using Orleans.Concurrency;
 using Squidex.Domain.Apps.Core.Rules;
 using Squidex.Domain.Apps.Read.Rules;
 using Squidex.Infrastructure;
 
-namespace Squidex.Domain.Apps.Read.State.Orleans.Grains.Implementations
+namespace Squidex.Domain.Apps.Read.State.Orleans.Grains
 {
-    [Immutable]
     public sealed class JsonRuleEntity :
         JsonEntity<JsonRuleEntity>,
         IRuleEntity,

src/Squidex.Domain.Apps.Read/State/Orleans/Grains/Implementations/JsonSchemaEntity.cs → src/Squidex.Domain.Apps.Read/State/Grains/JsonSchemaEntity.cs

@@ -8,14 +8,12 @@
 
 using System;
 using Newtonsoft.Json;
-using Orleans.Concurrency;
 using Squidex.Domain.Apps.Core.Schemas;
 using Squidex.Domain.Apps.Read.Schemas;
 using Squidex.Infrastructure;
 
-namespace Squidex.Domain.Apps.Read.State.Orleans.Grains.Implementations
+namespace Squidex.Domain.Apps.Read.State.Orleans.Grains
 {
-    [Immutable]
     public sealed class JsonSchemaEntity :
         JsonEntity<JsonSchemaEntity>,
         ISchemaEntity,

src/Squidex.Domain.Apps.Read/State/Orleans/Grains/IAppStateGrain.cs

@@ -1,37 +0,0 @@
-// ==========================================================================
-//  IAppStateGrain.cs
-//  Squidex Headless CMS
-// ==========================================================================
-//  Copyright (c) Squidex Group
-//  All rights reserved.
-// ==========================================================================
-
-using System;
-using System.Collections.Generic;
-using System.Threading.Tasks;
-using Orleans;
-using Squidex.Domain.Apps.Read.Apps;
-using Squidex.Domain.Apps.Read.Rules;
-using Squidex.Domain.Apps.Read.Schemas;
-using Squidex.Infrastructure.CQRS.Events;
-using Squidex.Infrastructure.Json.Orleans;
-
-namespace Squidex.Domain.Apps.Read.State.Orleans.Grains
-{
-    public interface IAppStateGrain : IGrainWithStringKey
-    {
-        Task<J<(IAppEntity, ISchemaEntity)>> GetAppWithSchemaAsync(Guid id);
-
-        Task<J<IAppEntity>> GetAppAsync();
-
-        Task<J<ISchemaEntity>> GetSchemaAsync(Guid id, bool provideDeleted = false);
-
-        Task<J<ISchemaEntity>> GetSchemaAsync(string name, bool provideDeleted = false);
-
-        Task<J<List<ISchemaEntity>>> GetSchemasAsync();
-
-        Task<J<List<IRuleEntity>>> GetRulesAsync();
-
-        Task HandleAsync(J<Envelope<IEvent>> message);
-    }
-}

src/Squidex.Domain.Apps.Read/State/Orleans/Grains/IAppUserGrain.cs

@@ -1,23 +0,0 @@
-// ==========================================================================
-//  IAppUserGrain.cs
-//  Squidex Headless CMS
-// ==========================================================================
-//  Copyright (c) Squidex Group
-//  All rights reserved.
-// ==========================================================================
-
-using System.Collections.Generic;
-using System.Threading.Tasks;
-using Orleans;
-
-namespace Squidex.Domain.Apps.Read.State.Orleans.Grains
-{
-    public interface IAppUserGrain : IGrainWithStringKey
-    {
-        Task<List<string>> GetSchemaNamesAsync();
-
-        Task AddAppAsync(string appName);
-
-        Task RemoveAppAsync(string appName);
-    }
-}

src/Squidex.Domain.Apps.Read/State/Orleans/Grains/Implementations/AppStateGrain.cs

@@ -1,121 +0,0 @@
-// ==========================================================================
-//  AppStateGrain.cs
-//  Squidex Headless CMS
-// ==========================================================================
-//  Copyright (c) Squidex Group
-//  All rights reserved.
-// ==========================================================================
-
-using System;
-using System.Collections.Generic;
-using System.Threading.Tasks;
-using Orleans.Runtime;
-using Squidex.Domain.Apps.Core.Schemas;
-using Squidex.Domain.Apps.Events.Apps;
-using Squidex.Domain.Apps.Read.Apps;
-using Squidex.Domain.Apps.Read.Rules;
-using Squidex.Domain.Apps.Read.Schemas;
-using Squidex.Infrastructure;
-using Squidex.Infrastructure.CQRS.Events;
-using Squidex.Infrastructure.Json.Orleans;
-using Squidex.Infrastructure.Orleans;
-
-namespace Squidex.Domain.Apps.Read.State.Orleans.Grains.Implementations
-{
-    public sealed class AppStateGrain : GrainV2<AppStateGrainState>, IAppStateGrain
-    {
-        private readonly FieldRegistry fieldRegistry;
-        private Exception exception;
-
-        public AppStateGrain(FieldRegistry fieldRegistry, IGrainRuntime runtime)
-            : base(runtime)
-        {
-            Guard.NotNull(fieldRegistry, nameof(fieldRegistry));
-            Guard.NotNull(runtime, nameof(runtime));
-
-            this.fieldRegistry = fieldRegistry;
-        }
-
-        protected override async Task ReadStateAsync()
-        {
-            try
-            {
-                await base.ReadStateAsync();
-            }
-            catch (Exception ex)
-            {
-                exception = ex;
-
-                State = new AppStateGrainState();
-            }
-        }
-
-        public override Task OnActivateAsync()
-        {
-            State.SetRegistry(fieldRegistry);
-
-            return base.OnActivateAsync();
-        }
-
-        public Task<J<(IAppEntity, ISchemaEntity)>> GetAppWithSchemaAsync(Guid id)
-        {
-            var schema = State.FindSchema(x => x.Id == id && !x.IsDeleted);
-
-            return Task.FromResult((State.GetApp(), schema).AsJ());
-        }
-
-        public Task<J<IAppEntity>> GetAppAsync()
-        {
-            var value = State.GetApp();
-
-            return Task.FromResult(value.AsJ());
-        }
-
-        public Task<J<List<IRuleEntity>>> GetRulesAsync()
-        {
-            var value = State.FindRules();
-
-            return Task.FromResult(value.AsJ());
-        }
-
-        public Task<J<List<ISchemaEntity>>> GetSchemasAsync()
-        {
-            var value = State.FindSchemas(x => !x.IsDeleted);
-
-            return Task.FromResult(value.AsJ());
-        }
-
-        public Task<J<ISchemaEntity>> GetSchemaAsync(Guid id, bool provideDeleted = false)
-        {
-            var value = State.FindSchema(x => x.Id == id && (!x.IsDeleted || provideDeleted));
-
-            return Task.FromResult(value.AsJ());
-        }
-
-        public Task<J<ISchemaEntity>> GetSchemaAsync(string name, bool provideDeleted = false)
-        {
-            var value = State.FindSchema(x => string.Equals(x.Name, name, StringComparison.OrdinalIgnoreCase) && (!x.IsDeleted || provideDeleted));
-
-            return Task.FromResult(value.AsJ());
-        }
-
-        public Task HandleAsync(J<Envelope<IEvent>> message)
-        {
-            if (exception != null)
-            {
-                if (message.Value.Payload is AppCreated)
-                {
-                    exception = null;
-                }
-                else
-                {
-                    throw exception;
-                }
-            }
-
-            State.Apply(message.Value);
-
-            return WriteStateAsync();
-        }
-    }
-}

src/Squidex.Domain.Apps.Read/State/Orleans/Grains/Implementations/AppUserGrain.cs

@@ -1,43 +0,0 @@
-// ==========================================================================
-//  AppUserGrain.cs
-//  Squidex Headless CMS
-// ==========================================================================
-//  Copyright (c) Squidex Group
-//  All rights reserved.
-// ==========================================================================
-
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
-using Orleans.Runtime;
-using Squidex.Infrastructure.Orleans;
-
-namespace Squidex.Domain.Apps.Read.State.Orleans.Grains.Implementations
-{
-    public sealed class AppUserGrain : GrainV2<AppUserGrainState>, IAppUserGrain
-    {
-        public AppUserGrain(IGrainRuntime runtime)
-            : base(runtime)
-        {
-        }
-
-        public Task AddAppAsync(string appName)
-        {
-            State.AppNames.Add(appName);
-
-            return WriteStateAsync();
-        }
-
-        public Task RemoveAppAsync(string appName)
-        {
-            State.AppNames.Remove(appName);
-
-            return WriteStateAsync();
-        }
-
-        public Task<List<string>> GetSchemaNamesAsync()
-        {
-            return Task.FromResult(State.AppNames.ToList());
-        }
-    }
-}

src/Squidex.Domain.Apps.Read/State/Orleans/OrleansAppProvider.cs

@@ -1,129 +0,0 @@
-// ==========================================================================
-//  OrleansAppProvider.cs
-//  Squidex Headless CMS
-// ==========================================================================
-//  Copyright (c) Squidex Group
-//  All rights reserved.
-// ==========================================================================
-
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
-using Orleans;
-using Squidex.Domain.Apps.Read.Apps;
-using Squidex.Domain.Apps.Read.Rules;
-using Squidex.Domain.Apps.Read.Schemas;
-using Squidex.Domain.Apps.Read.State.Orleans.Grains;
-using Squidex.Infrastructure;
-using Squidex.Infrastructure.Log;
-
-namespace Squidex.Domain.Apps.Read.State.Orleans
-{
-    public sealed class OrleansAppProvider : IAppProvider
-    {
-        private readonly IGrainFactory factory;
-        private readonly ISemanticLog log;
-
-        public OrleansAppProvider(IGrainFactory factory, ISemanticLog log)
-        {
-            Guard.NotNull(factory, nameof(factory));
-            Guard.NotNull(log, nameof(log));
-
-            this.factory = factory;
-
-            this.log = log;
-        }
-
-        public async Task<IAppEntity> GetAppAsync(string appName)
-        {
-            using (log.MeasureTrace(w => w
-                .WriteProperty("module", nameof(OrleansAppProvider))
-                .WriteProperty("method", nameof(GetAppAsync))))
-            {
-                var result = await factory.GetGrain<IAppStateGrain>(appName).GetAppAsync();
-
-                return result.Value;
-            }
-        }
-
-        public async Task<(IAppEntity, ISchemaEntity)> GetAppWithSchemaAsync(string appName, Guid id)
-        {
-            using (log.MeasureTrace(w => w
-                .WriteProperty("module", nameof(OrleansAppProvider))
-                .WriteProperty("method", nameof(GetAppWithSchemaAsync))))
-            {
-                var result = await factory.GetGrain<IAppStateGrain>(appName).GetAppWithSchemaAsync(id);
-
-                return result.Value;
-            }
-        }
-
-        public async Task<List<IRuleEntity>> GetRulesAsync(string appName)
-        {
-            using (log.MeasureTrace(w => w
-                .WriteProperty("module", nameof(OrleansAppProvider))
-                .WriteProperty("method", nameof(GetRulesAsync))))
-            {
-                var result = await factory.GetGrain<IAppStateGrain>(appName).GetRulesAsync();
-
-                return result.Value;
-            }
-        }
-
-        public async Task<ISchemaEntity> GetSchemaAsync(string appName, Guid id, bool provideDeleted = false)
-        {
-            using (log.MeasureTrace(w => w
-                .WriteProperty("module", nameof(OrleansAppProvider))
-                .WriteProperty("method", nameof(GetSchemaAsync))))
-            {
-                var result = await factory.GetGrain<IAppStateGrain>(appName).GetSchemaAsync(id, provideDeleted);
-
-                return result.Value;
-            }
-        }
-
-        public async Task<ISchemaEntity> GetSchemaAsync(string appName, string name, bool provideDeleted = false)
-        {
-            using (log.MeasureTrace(w => w
-                .WriteProperty("module", nameof(OrleansAppProvider))
-                .WriteProperty("method", nameof(GetSchemaAsync))))
-            {
-                var result = await factory.GetGrain<IAppStateGrain>(appName).GetSchemaAsync(name, provideDeleted);
-
-                return result.Value;
-            }
-        }
-
-        public async Task<List<ISchemaEntity>> GetSchemasAsync(string appName)
-        {
-            using (log.MeasureTrace(w => w
-                .WriteProperty("module", nameof(OrleansAppProvider))
-                .WriteProperty("method", nameof(GetSchemasAsync))))
-            {
-                var result = await factory.GetGrain<IAppStateGrain>(appName).GetSchemasAsync();
-
-                return result.Value;
-            }
-        }
-
-        public async Task<List<IAppEntity>> GetUserApps(string userId)
-        {
-            using (log.MeasureTrace(w => w
-                .WriteProperty("module", nameof(OrleansAppProvider))
-                .WriteProperty("method", nameof(GetUserApps))))
-            {
-                var schemaIds = await factory.GetGrain<IAppUserGrain>(userId).GetSchemaNamesAsync();
-
-                var tasks =
-                    schemaIds
-                        .Select(x => factory.GetGrain<IAppStateGrain>(x))
-                        .Select(x => x.GetAppAsync());
-
-                var apps = await Task.WhenAll(tasks);
-
-                return apps.Select(a => a.Value).Where(a => a != null).ToList();
-            }
-        }
-    }
-}

src/Squidex.Domain.Users.MongoDb/Squidex.Domain.Users.MongoDb.csproj

@@ -13,7 +13,7 @@
     <ProjectReference Include="..\Squidex.Shared\Squidex.Shared.csproj" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="IdentityServer4" Version="2.0.3" />
+    <PackageReference Include="IdentityServer4" Version="2.0.4" />
     <PackageReference Include="Microsoft.AspNetCore.Identity" Version="2.0.1" />
     <PackageReference Include="Microsoft.Win32.Registry" Version="4.4.0" />
     <PackageReference Include="MongoDB.Driver" Version="2.4.4" />

src/Squidex.Infrastructure.MongoDb/CQRS/Events/MongoEventStore.cs

@@ -60,7 +60,7 @@ namespace Squidex.Infrastructure.CQRS.Events
             Guard.NotNull(subscriber, nameof(subscriber));
             Guard.NotNullOrEmpty(streamFilter, nameof(streamFilter));
 
-            return new EventStoreSubscription(this, subscriber, streamFilter, position);
+            return new PollingSubscription(this, notifier, subscriber, streamFilter, position);
         }
 
         public async Task<IReadOnlyList<StoredEvent>> GetEventsAsync(string streamName)

src/Squidex.Infrastructure.MongoDb/States/MongoStateStore.cs

@@ -0,0 +1,113 @@
+// ==========================================================================
+//  MongoStateStore.cs
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex Group
+//  All rights reserved.
+// ==========================================================================
+
+using System;
+using System.Threading.Tasks;
+using MongoDB.Bson;
+using MongoDB.Driver;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+using Squidex.Infrastructure.MongoDb;
+
+namespace Squidex.Infrastructure.States
+{
+    public sealed class MongoStateStore : IStateStore, IExternalSystem
+    {
+        private const string FieldId = "_id";
+        private const string FieldDoc = "_doc";
+        private const string FieldEtag = "_etag";
+        private static readonly UpdateOptions Upsert = new UpdateOptions { IsUpsert = true };
+        private static readonly FilterDefinitionBuilder<BsonDocument> Filter = Builders<BsonDocument>.Filter;
+        private static readonly UpdateDefinitionBuilder<BsonDocument> Update = Builders<BsonDocument>.Update;
+        private static readonly ProjectionDefinitionBuilder<BsonDocument> Projection = Builders<BsonDocument>.Projection;
+        private readonly IMongoDatabase database;
+        private readonly JsonSerializer serializer;
+
+        public MongoStateStore(IMongoDatabase database, JsonSerializer serializer)
+        {
+            Guard.NotNull(database, nameof(database));
+            Guard.NotNull(serializer, nameof(serializer));
+
+            this.database = database;
+            this.serializer = serializer;
+        }
+
+        public void Connect()
+        {
+            try
+            {
+                database.ListCollections();
+            }
+            catch (Exception ex)
+            {
+                throw new ConfigurationException($"MongoDb connection failed to connect to database {database.DatabaseNamespace.DatabaseName}", ex);
+            }
+        }
+
+        public async Task<(T Value, string Etag)> ReadAsync<T>(string key)
+        {
+            var collection = GetCollection<T>();
+
+            var existing =
+                await collection.Find(Filter.Eq(FieldId, key))
+                    .FirstOrDefaultAsync();
+
+            if (existing != null)
+            {
+                var value = existing[FieldDoc].AsBsonDocument.ToJson().ToObject<T>(serializer);
+
+                return (value, existing[FieldEtag].AsString);
+            }
+
+            return (default(T), null);
+        }
+
+        public async Task WriteAsync<T>(string key, T value, string oldEtag, string newEtag)
+        {
+            var collection = GetCollection<T>();
+
+            var newData = JToken.FromObject(value, serializer).ToBson();
+
+            try
+            {
+                await collection.UpdateOneAsync(
+                    Filter.And(
+                        Filter.Eq(FieldId, key),
+                        Filter.Eq(FieldEtag, oldEtag)
+                    ),
+                    Update
+                        .Set(FieldEtag, newEtag)
+                        .Set(FieldDoc, newData),
+                    Upsert);
+            }
+            catch (MongoWriteException ex)
+            {
+                if (ex.WriteError.Category == ServerErrorCategory.DuplicateKey)
+                {
+                    var existingEtag =
+                        await collection.Find(Filter.Eq(FieldId, key))
+                            .Project<BsonDocument>(Projection.Exclude(FieldDoc)).FirstOrDefaultAsync();
+
+                    if (existingEtag != null && existingEtag.Contains(FieldEtag))
+                    {
+                        throw new InconsistentStateException(existingEtag[FieldEtag].AsString, oldEtag, ex);
+                    }
+                }
+                else
+                {
+                    throw;
+                }
+            }
+        }
+
+        private IMongoCollection<BsonDocument> GetCollection<T>()
+        {
+            return database.GetCollection<BsonDocument>($"States_{typeof(T).Name}");
+        }
+    }
+}

src/Squidex.Infrastructure/CQRS/Events/Actors/EventConsumerActor.cs

@@ -78,16 +78,16 @@ namespace Squidex.Infrastructure.CQRS.Events.Actors
             dispatcher.DispatchAsync(() => HandleSetupAsync(eventConsumer)).Forget();
         }
 
-        private async Task HandleSetupAsync(IEventConsumer consumer)
+        private Task HandleSetupAsync(IEventConsumer consumer)
         {
             eventConsumer = consumer;
 
-            await ReadStateAsync();
-
             if (!State.IsStopped)
             {
                 Subscribe(State.Position);
             }
+
+            return TaskHelper.Done;
         }
 
         private Task HandleEventAsync(IEventSubscription subscription, StoredEvent storedEvent)

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

@@ -0,0 +1,41 @@
+// ==========================================================================
+//  DefaultEventNotifier.cs
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex Group
+//  All rights reserved.
+// ==========================================================================
+
+using System;
+
+namespace Squidex.Infrastructure.CQRS.Events
+{
+    public sealed class DefaultEventNotifier : IEventNotifier
+    {
+        private static readonly string ChannelName = typeof(DefaultEventNotifier).Name;
+
+        private readonly IPubSub pubsub;
+
+        public sealed class EventNotification
+        {
+            public string StreamName { get; set; }
+        }
+
+        public DefaultEventNotifier(IPubSub pubsub)
+        {
+            Guard.NotNull(pubsub, nameof(pubsub));
+
+            this.pubsub = pubsub;
+        }
+
+        public void NotifyEventsStored(string streamName)
+        {
+            pubsub.Publish(new EventNotification { StreamName = streamName }, true);
+        }
+
+        public IDisposable Subscribe(Action<string> handler)
+        {
+            return pubsub.Subscribe<EventNotification>(x => handler?.Invoke(x.StreamName));
+        }
+    }
+}

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

@@ -6,10 +6,14 @@
 //  All rights reserved.
 // ==========================================================================
 
+using System;
+
 namespace Squidex.Infrastructure.CQRS.Events
 {
     public interface IEventNotifier
     {
         void NotifyEventsStored(string streamName);
+
+        IDisposable Subscribe(Action<string> handler);
     }
 }

src/Squidex.Infrastructure/CQRS/Events/EventStoreSubscription.cs → src/Squidex.Infrastructure/CQRS/Events/PollingSubscription.cs

@@ -1,5 +1,5 @@
 // ==========================================================================
-//  EventStoreSubscription.cs
+//  PollingSubscription.cs
 //  Squidex Headless CMS
 // ==========================================================================
 //  Copyright (c) Squidex Group
@@ -7,33 +7,43 @@
 // ==========================================================================
 
 using System;
-using System.Threading;
+using System.Text.RegularExpressions;
 using System.Threading.Tasks;
+using Squidex.Infrastructure.Timers;
 
 namespace Squidex.Infrastructure.CQRS.Events
 {
-    public sealed class EventStoreSubscription : IEventSubscription
+    public sealed class PollingSubscription : IEventSubscription
     {
+        private readonly IEventNotifier eventNotifier;
         private readonly IEventStore eventStore;
         private readonly IEventSubscriber eventSubscriber;
-        private readonly CancellationTokenSource cts = new CancellationTokenSource();
-        private readonly Task task;
+        private readonly IDisposable notification;
+        private readonly CompletionTimer timer;
+        private readonly Regex streamRegex;
         private readonly string streamFilter;
+        private string position;
 
-        public EventStoreSubscription(
+        public PollingSubscription(
             IEventStore eventStore,
+            IEventNotifier eventNotifier,
             IEventSubscriber eventSubscriber,
             string streamFilter,
             string position)
         {
             Guard.NotNull(eventStore, nameof(eventStore));
+            Guard.NotNull(eventNotifier, nameof(eventNotifier));
             Guard.NotNull(eventSubscriber, nameof(eventSubscriber));
 
+            this.position = position;
+            this.eventNotifier = eventNotifier;
             this.eventStore = eventStore;
             this.eventSubscriber = eventSubscriber;
             this.streamFilter = streamFilter;
 
-            task = Task.Run(async () =>
+            streamRegex = new Regex(streamFilter);
+
+            timer = new CompletionTimer(5000, async ct =>
             {
                 try
                 {
@@ -42,7 +52,7 @@ namespace Squidex.Infrastructure.CQRS.Events
                         await eventSubscriber.OnEventAsync(this, storedEvent);
 
                         position = storedEvent.EventPosition;
-                    }, cts.Token, streamFilter, position);
+                    }, ct, streamFilter, position);
                 }
                 catch (Exception ex)
                 {
@@ -52,13 +62,21 @@ namespace Squidex.Infrastructure.CQRS.Events
                     }
                 }
             });
+
+            notification = eventNotifier.Subscribe(streamName =>
+            {
+                if (streamRegex.IsMatch(streamName))
+                {
+                    timer.SkipCurrentDelay();
+                }
+            });
         }
 
         public Task StopAsync()
         {
-            cts.Cancel();
+            notification?.Dispose();
 
-            return task;
+            return timer.StopAsync();
         }
     }
 }

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

@@ -11,6 +11,7 @@ using System.Runtime.Serialization;
 
 namespace Squidex.Infrastructure.CQRS.Events
 {
+    [Serializable]
     public class WrongEventVersionException : Exception
     {
         private readonly long currentVersion;

src/Squidex.Infrastructure/Caching/InvalidationMessage.cs → src/Squidex.Infrastructure/Caching/InvalidateMessage.cs

@@ -1,5 +1,5 @@
 // ==========================================================================
-//  InvalidationMessage.cs
+//  InvalidateMessage.cs
 //  Squidex Headless CMS
 // ==========================================================================
 //  Copyright (c) Squidex Group
@@ -8,7 +8,7 @@
 
 namespace Squidex.Infrastructure.Caching
 {
-    public sealed class InvalidationMessage
+    public sealed class InvalidateMessage
     {
         public string CacheKey { get; set; }
     }

src/Squidex.Infrastructure/Caching/InvalidatingMemoryCache.cs

@@ -25,7 +25,7 @@ namespace Squidex.Infrastructure.Caching
             this.inner = inner;
             this.invalidator = invalidator;
 
-            subscription = invalidator.Subscribe<InvalidationMessage>(m =>
+            subscription = invalidator.Subscribe<InvalidateMessage>(m =>
             {
                 inner.Remove(m.CacheKey);
             });
@@ -60,7 +60,7 @@ namespace Squidex.Infrastructure.Caching
         {
             if (key is string stringKey)
             {
-                invalidator.Publish(new InvalidationMessage { CacheKey = stringKey }, true);
+                invalidator.Publish(new InvalidateMessage { CacheKey = stringKey }, true);
             }
         }
     }

src/Squidex.Infrastructure/States/InconsistentStateException.cs

@@ -0,0 +1,48 @@
+// ==========================================================================
+//  InconsistentStateException.cs
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex Group
+//  All rights reserved.
+// ==========================================================================
+
+using System;
+using System.Runtime.Serialization;
+
+namespace Squidex.Infrastructure.States
+{
+    [Serializable]
+    public class InconsistentStateException : Exception
+    {
+        private readonly string currentEtag;
+        private readonly string expectedEtag;
+
+        public string CurrentEtag
+        {
+            get { return currentEtag; }
+        }
+
+        public string ExpectedEtag
+        {
+            get { return expectedEtag; }
+        }
+
+        public InconsistentStateException(string currentEtag, string expectedEtag, Exception ex)
+            : base(FormatMessage(currentEtag, expectedEtag), ex)
+        {
+            this.currentEtag = currentEtag;
+
+            this.expectedEtag = expectedEtag;
+        }
+
+        protected InconsistentStateException(SerializationInfo info, StreamingContext context)
+            : base(info, context)
+        {
+        }
+
+        private static string FormatMessage(string currentEtag, string expectedEtag)
+        {
+            return $"Requested etag {expectedEtag}, but found {currentEtag}.";
+        }
+    }
+}

src/Squidex.Infrastructure/States/StateFactory.cs

@@ -22,7 +22,7 @@ namespace Squidex.Infrastructure.States
         private readonly IMemoryCache statesCache;
         private readonly IServiceProvider services;
         private readonly List<IDisposable> states = new List<IDisposable>();
-        private readonly SingleThreadedDispatcher cleanupDispatcher = new SingleThreadedDispatcher();
+        private readonly SingleThreadedDispatcher dispatcher = new SingleThreadedDispatcher();
         private IDisposable pubSubscription;
 
         public StateFactory(
@@ -50,58 +50,74 @@ namespace Squidex.Infrastructure.States
             });
         }
 
-        public async Task<T> GetAsync<T, TState>(string key) where T : StatefulObject<TState>
+        public Task<T> GetAsync<T, TState>(string key) where T : StatefulObject<TState>
         {
             Guard.NotNull(key, nameof(key));
 
-            if (statesCache.TryGetValue<T>(key, out var state))
+            var tcs = new TaskCompletionSource<T>();
+
+            dispatcher.DispatchAsync(async () =>
             {
-                return state;
-            }
+                try
+                {
+                    if (statesCache.TryGetValue<T>(key, out var state))
+                    {
+                        tcs.SetResult(state);
+                    }
+                    else
+                    {
+                        state = (T)services.GetService(typeof(T));
 
-            state = (T)services.GetService(typeof(T));
+                        var stateHolder = new StateHolder<TState>(key, () =>
+                        {
+                            pubSub.Publish(new InvalidateMessage { Key = key }, false);
+                        }, store);
 
-            var stateHolder = new StateHolder<TState>(key, () =>
-            {
-                pubSub.Publish(new InvalidateMessage { Key = key }, false);
-            }, store);
+                        await state.ActivateAsync(stateHolder);
 
-            await state.ActivateAsync(stateHolder);
+                        var stateEntry = statesCache.CreateEntry(key);
 
-            var stateEntry = statesCache.CreateEntry(key);
+                        stateEntry.Value = state;
+                        stateEntry.AbsoluteExpirationRelativeToNow = CacheDuration;
 
-            stateEntry.Value = state;
-            stateEntry.AbsoluteExpirationRelativeToNow = CacheDuration;
+                        stateEntry.PostEvictionCallbacks.Add(new PostEvictionCallbackRegistration
+                        {
+                            EvictionCallback = (k, v, r, s) =>
+                            {
+                                dispatcher.DispatchAsync(() =>
+                                {
+                                    state.Dispose();
+                                    states.Remove(state);
+                                }).Forget();
+                            }
+                        });
 
-            stateEntry.PostEvictionCallbacks.Add(new PostEvictionCallbackRegistration
-            {
-                EvictionCallback = (k, v, r, s) =>
+                        states.Add(state);
+
+                        tcs.SetResult(state);
+                    }
+                }
+                catch (Exception ex)
                 {
-                    cleanupDispatcher.DispatchAsync(() =>
-                    {
-                        state.Dispose();
-                        states.Remove(state);
-                    }).Forget();
+                    tcs.SetException(ex);
                 }
             });
 
-            states.Add(state);
-
-            return state;
+            return tcs.Task;
         }
 
         protected override void DisposeObject(bool disposing)
         {
             if (disposing)
             {
-                cleanupDispatcher.DispatchAsync(() =>
+                dispatcher.DispatchAsync(() =>
                 {
                     foreach (var state in states)
                     {
                         state.Dispose();
                     }
                 });
-                cleanupDispatcher.StopAndWaitAsync().Wait();
+                dispatcher.StopAndWaitAsync().Wait();
             }
         }
     }

src/Squidex.Infrastructure/States/StateHolder.cs

@@ -30,6 +30,11 @@ namespace Squidex.Infrastructure.States
         public async Task ReadAsync()
         {
             (State, etag) = await store.ReadAsync<T>(key);
+
+            if (Equals(State, default(T)))
+            {
+                State = Activator.CreateInstance<T>();
+            }
         }
 
         public async Task WriteAsync()

src/Squidex.Infrastructure/States/StatefulObject.cs

@@ -46,7 +46,7 @@ namespace Squidex.Infrastructure.States
             return stateHolder.ReadAsync();
         }
 
-        public async Task ReadStateAsync()
+        public virtual async Task ReadStateAsync()
         {
             if (stateHolder != null)
             {
@@ -54,12 +54,16 @@ namespace Squidex.Infrastructure.States
             }
         }
 
-        public async Task WriteStateAsync()
+        public virtual async Task WriteStateAsync()
         {
             if (stateHolder != null)
             {
                 await stateHolder.WriteAsync();
             }
         }
+
+        protected override void DisposeObject(bool disposing)
+        {
+        }
     }
 }

src/Squidex.Infrastructure/Tasks/SingleThreadedDispatcher.cs

@@ -29,6 +29,52 @@ namespace Squidex.Infrastructure.Tasks
             block = new ActionBlock<Func<Task>>(Handle, options);
         }
 
+        public Task DispatchAndUnwrapAsync(Func<Task> action)
+        {
+            Guard.NotNull(action, nameof(action));
+
+            var tcs = new TaskCompletionSource<bool>();
+
+            block.SendAsync(async () =>
+            {
+                try
+                {
+                    await action();
+
+                    tcs.SetResult(true);
+                }
+                catch (Exception ex)
+                {
+                    tcs.SetException(ex);
+                }
+            });
+
+            return tcs.Task;
+        }
+
+        public Task<T> DispatchAndUnwrapAsync<T>(Func<Task<T>> action)
+        {
+            Guard.NotNull(action, nameof(action));
+
+            var tcs = new TaskCompletionSource<T>();
+
+            block.SendAsync(async () =>
+            {
+                try
+                {
+                    var result = await action();
+
+                    tcs.SetResult(result);
+                }
+                catch (Exception ex)
+                {
+                    tcs.SetException(ex);
+                }
+            });
+
+            return tcs.Task;
+        }
+
         public Task DispatchAsync(Func<Task> action)
         {
             Guard.NotNull(action, nameof(action));

src/Squidex/Areas/Api/Controllers/Assets/AssetsController.cs

@@ -164,7 +164,7 @@ namespace Squidex.Areas.Api.Controllers.Assets
         [Route("apps/{app}/assets/")]
         [ProducesResponseType(typeof(AssetCreatedDto), 201)]
         [ProducesResponseType(typeof(ErrorDto), 400)]
-        public async Task<IActionResult> PostAsset(string app, List<IFormFile> file)
+        public async Task<IActionResult> PostAsset(string app, [SwaggerIgnore] List<IFormFile> file)
         {
             var assetFile = await CheckAssetFileAsync(file);
 
@@ -188,13 +188,16 @@ namespace Squidex.Areas.Api.Controllers.Assets
         /// 404 => Asset or app not found.
         /// 400 => Asset exceeds the maximum size.
         /// </returns>
+        /// <remarks>
+        /// Use multipart request to upload an asset.
+        /// </remarks>
         [MustBeAppEditor]
         [HttpPut]
         [Route("apps/{app}/assets/{id}/content/")]
         [ProducesResponseType(typeof(AssetReplacedDto), 201)]
         [ProducesResponseType(typeof(ErrorDto), 400)]
         [ApiCosts(1)]
-        public async Task<IActionResult> PutAssetContent(string app, Guid id, List<IFormFile> file)
+        public async Task<IActionResult> PutAssetContent(string app, Guid id, [SwaggerIgnore] List<IFormFile> file)
         {
             var assetFile = await CheckAssetFileAsync(file);
 

tests/Squidex.Domain.Apps.Read.Tests/Rules/RuleDequeuerGrainTests.cs → tests/Squidex.Domain.Apps.Read.Tests/Rules/RuleDequeuerTests.cs

@@ -10,13 +10,8 @@ using System;
 using System.Threading.Tasks;
 using FakeItEasy;
 using NodaTime;
-using Orleans.Concurrency;
-using Orleans.Core;
-using Orleans.Runtime;
 using Squidex.Domain.Apps.Core.HandleRules;
 using Squidex.Domain.Apps.Core.Rules;
-using Squidex.Domain.Apps.Read.Rules.Orleans.Grains;
-using Squidex.Domain.Apps.Read.Rules.Orleans.Grains.Implementation;
 using Squidex.Domain.Apps.Read.Rules.Repositories;
 using Squidex.Infrastructure.Log;
 using Xunit;
@@ -25,42 +20,25 @@ using Xunit;
 
 namespace Squidex.Domain.Apps.Read.Rules
 {
-    public class RuleDequeuerGrainTests
+    public class RuleDequeuerTests
     {
         private readonly IClock clock = A.Fake<IClock>();
         private readonly ISemanticLog log = A.Fake<ISemanticLog>();
         private readonly IAppProvider appProvider = A.Fake<IAppProvider>();
         private readonly IRuleEventRepository ruleEventRepository = A.Fake<IRuleEventRepository>();
         private readonly RuleService ruleService = A.Fake<RuleService>();
-        private readonly MyRuleDequeuerGrain sut;
+        private readonly RuleDequeuer sut;
         private readonly Instant now = SystemClock.Instance.GetCurrentInstant();
 
-        public sealed class MyRuleDequeuerGrain : RuleDequeuerGrain
-        {
-            public MyRuleDequeuerGrain(RuleService ruleService, IRuleEventRepository ruleEventRepository, ISemanticLog log, IClock clock,
-                IGrainIdentity identity,
-                IGrainRuntime runtime)
-                : base(ruleService, ruleEventRepository, log, clock, identity, runtime)
-            {
-            }
-
-            protected override IRuleDequeuerGrain GetSelf()
-            {
-                return this;
-            }
-        }
-
-        public RuleDequeuerGrainTests()
+        public RuleDequeuerTests()
         {
             A.CallTo(() => clock.GetCurrentInstant()).Returns(now);
 
-            sut = new MyRuleDequeuerGrain(
+            sut = new RuleDequeuer(
                 ruleService,
                 ruleEventRepository,
                 log,
-                clock,
-                A.Fake<IGrainIdentity>(),
-                A.Fake<IGrainRuntime>());
+                clock);
         }
 
         [Theory]
@@ -90,9 +68,9 @@ namespace Squidex.Domain.Apps.Read.Rules
                 nextCall = now.Plus(Duration.FromMinutes(minutes));
             }
 
-            await sut.OnActivateAsync();
-            await sut.HandleAsync(@event.AsImmutable());
-            await sut.OnDeactivateAsync();
+            await sut.HandleAsync(@event);
+
+            sut.Dispose();
 
             A.CallTo(() => ruleEventRepository.MarkSentAsync(@event.Id, requestDump, result, jobResult, requestElapsed, nextCall))
                 .MustHaveHappened();

tests/Squidex.Infrastructure.Tests/CQRS/Events/DefaultEventNotifierTests.cs

@@ -0,0 +1,50 @@
+// ==========================================================================
+//  DefaultEventNotifierTests.cs
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex Group
+//  All rights reserved.
+// ==========================================================================
+
+using System.Collections.Generic;
+using Xunit;
+
+namespace Squidex.Infrastructure.CQRS.Events
+{
+    public sealed class DefaultEventNotifierTests
+    {
+        private readonly DefaultEventNotifier sut = new DefaultEventNotifier(new InMemoryPubSub());
+
+        [Fact]
+        public void Should_invalidate_all_actions()
+        {
+            var handler1Handled = 0;
+            var handler2Handled = 0;
+
+            var streamNames = new List<string>();
+
+            sut.Subscribe(x =>
+            {
+                streamNames.Add(x);
+
+                handler1Handled++;
+            });
+
+            sut.NotifyEventsStored("a");
+
+            sut.Subscribe(x =>
+            {
+                streamNames.Add(x);
+
+                handler2Handled++;
+            });
+
+            sut.NotifyEventsStored("b");
+
+            Assert.Equal(2, handler1Handled);
+            Assert.Equal(1, handler2Handled);
+
+            Assert.Equal(streamNames.ToArray(), new[] { "a", "b", "b" });
+        }
+    }
+}

tests/Squidex.Infrastructure.Tests/CQRS/Events/EventSubscriptionTests.cs → tests/Squidex.Infrastructure.Tests/CQRS/Events/PollingSubscriptionTests.cs

@@ -14,16 +14,17 @@ using Xunit;
 
 namespace Squidex.Infrastructure.CQRS.Events
 {
-    public class EventSubscriptionTests
+    public class PollingSubscriptionTests
     {
         private readonly IEventStore eventStore = A.Fake<IEventStore>();
+        private readonly IEventNotifier eventNotifier = new DefaultEventNotifier(new InMemoryPubSub());
         private readonly IEventSubscriber eventSubscriber = A.Fake<IEventSubscriber>();
         private readonly string position = Guid.NewGuid().ToString();
 
         [Fact]
         public async Task Should_subscribe_on_start()
         {
-            var sut = new EventStoreSubscription(eventStore, eventSubscriber, "^my-stream", position);
+            var sut = new PollingSubscription(eventStore, eventNotifier, eventSubscriber, "^my-stream", position);
 
             await WaitAndStopAsync(sut);
 
@@ -39,7 +40,7 @@ namespace Squidex.Infrastructure.CQRS.Events
             A.CallTo(() => eventStore.GetEventsAsync(A<Func<StoredEvent, Task>>.Ignored, A<CancellationToken>.Ignored, "^my-stream", position))
                 .Throws(ex);
 
-            var sut = new EventStoreSubscription(eventStore, eventSubscriber, "^my-stream", position);
+            var sut = new PollingSubscription(eventStore, eventNotifier, eventSubscriber, "^my-stream", position);
 
             await WaitAndStopAsync(sut);
 
@@ -55,7 +56,7 @@ namespace Squidex.Infrastructure.CQRS.Events
             A.CallTo(() => eventStore.GetEventsAsync(A<Func<StoredEvent, Task>>.Ignored, A<CancellationToken>.Ignored, "^my-stream", position))
                 .Throws(ex);
 
-            var sut = new EventStoreSubscription(eventStore, eventSubscriber, "^my-stream", position);
+            var sut = new PollingSubscription(eventStore, eventNotifier, eventSubscriber, "^my-stream", position);
 
             await WaitAndStopAsync(sut);
 
@@ -71,7 +72,7 @@ namespace Squidex.Infrastructure.CQRS.Events
             A.CallTo(() => eventStore.GetEventsAsync(A<Func<StoredEvent, Task>>.Ignored, A<CancellationToken>.Ignored, "^my-stream", position))
                 .Throws(ex);
 
-            var sut = new EventStoreSubscription(eventStore, eventSubscriber, "^my-stream", position);
+            var sut = new PollingSubscription(eventStore, eventNotifier, eventSubscriber, "^my-stream", position);
 
             await WaitAndStopAsync(sut);
 
@@ -79,6 +80,32 @@ namespace Squidex.Infrastructure.CQRS.Events
                 .MustNotHaveHappened();
         }
 
+        [Fact]
+        public async Task Should_not_subscribe_on_notify_when_stream_matches()
+        {
+            var sut = new PollingSubscription(eventStore, eventNotifier, eventSubscriber, "^my-stream", position);
+
+            eventNotifier.NotifyEventsStored("other-stream-123");
+
+            await WaitAndStopAsync(sut);
+
+            A.CallTo(() => eventStore.GetEventsAsync(A<Func<StoredEvent, Task>>.Ignored, A<CancellationToken>.Ignored, "^my-stream", position))
+                .MustHaveHappened(Repeated.Exactly.Once);
+        }
+
+        [Fact]
+        public async Task Should_subscribe_on_notify_when_stream_matches()
+        {
+            var sut = new PollingSubscription(eventStore, eventNotifier, eventSubscriber, "^my-stream", position);
+
+            eventNotifier.NotifyEventsStored("my-stream-123");
+
+            await WaitAndStopAsync(sut);
+
+            A.CallTo(() => eventStore.GetEventsAsync(A<Func<StoredEvent, Task>>.Ignored, A<CancellationToken>.Ignored, "^my-stream", position))
+                .MustHaveHappened(Repeated.Exactly.Twice);
+        }
+
         private static async Task WaitAndStopAsync(IEventSubscription sut)
         {
             await Task.Delay(200);

tests/Squidex.Infrastructure.Tests/Caching/InvalidatingMemoryCacheTests.cs

@@ -61,7 +61,7 @@ namespace Squidex.Infrastructure.Caching
         {
             sut.Invalidate(123);
 
-            A.CallTo(() => pubsub.Publish(A<InvalidationMessage>.That.Matches(x => x.CacheKey == "a-key"), true)).MustNotHaveHappened();
+            A.CallTo(() => pubsub.Publish(A<InvalidateMessage>.That.Matches(x => x.CacheKey == "a-key"), true)).MustNotHaveHappened();
         }
 
         [Fact]
@@ -69,7 +69,7 @@ namespace Squidex.Infrastructure.Caching
         {
             sut.Invalidate("a-key");
 
-            A.CallTo(() => pubsub.Publish(A<InvalidationMessage>.That.Matches(x => x.CacheKey == "a-key"), true)).MustHaveHappened();
+            A.CallTo(() => pubsub.Publish(A<InvalidateMessage>.That.Matches(x => x.CacheKey == "a-key"), true)).MustHaveHappened();
         }
 
         [Fact]
@@ -77,7 +77,7 @@ namespace Squidex.Infrastructure.Caching
         {
             ((IMemoryCache)sut).Invalidate("a-key");
 
-            A.CallTo(() => pubsub.Publish(A<InvalidationMessage>.That.Matches(x => x.CacheKey == "a-key"), true)).MustHaveHappened();
+            A.CallTo(() => pubsub.Publish(A<InvalidateMessage>.That.Matches(x => x.CacheKey == "a-key"), true)).MustHaveHappened();
         }
 
         [Fact]
@@ -117,7 +117,7 @@ namespace Squidex.Infrastructure.Caching
 
             Assert.Equal(123, anotherSut.Get<int>("a-key"));
 
-            anotherPubsub.Publish(new InvalidationMessage { CacheKey = "a-key" }, true);
+            anotherPubsub.Publish(new InvalidateMessage { CacheKey = "a-key" }, true);
 
             Assert.Equal(0, anotherSut.Get<int>("a-key"));
         }