Base class for grains.

src/Squidex.Domain.Apps.Entities/Apps/AppUISettingsGrain.cs

@@ -8,6 +8,7 @@
 using System;
 using System.Linq;
 using System.Threading.Tasks;
+using Squidex.Domain.Apps.Entities.Apps.Indexes;
 using Squidex.Infrastructure;
 using Squidex.Infrastructure.Json.Objects;
 using Squidex.Infrastructure.Orleans;
@@ -15,42 +16,29 @@ using Squidex.Infrastructure.States;
 
 namespace Squidex.Domain.Apps.Entities.Apps
 {
-    public sealed class AppUISettingsGrain : GrainOfGuid, IAppUISettingsGrain
+    public sealed class AppUISettingsGrain : GrainOfGuid<AppUISettingsGrain.GrainState>, IAppUISettingsGrain
     {
-        private readonly IStore<Guid> store;
-        private IPersistence<State> persistence;
-        private State state = new State();
-
         [CollectionName("UISettings")]
-        public sealed class State
+        public sealed class GrainState
         {
             public JsonObject Settings { get; set; } = JsonValue.Object();
         }
 
         public AppUISettingsGrain(IStore<Guid> store)
+            : base(store)
         {
-            Guard.NotNull(store, nameof(store));
-
-            this.store = store;
-        }
-
-        public override Task OnActivateAsync(Guid key)
-        {
-            persistence = store.WithSnapshots<State, Guid>(GetType(), key, x => state = x);
-
-            return persistence.ReadAsync();
         }
 
         public Task<J<JsonObject>> GetAsync()
         {
-            return Task.FromResult(state.Settings.AsJ());
+            return Task.FromResult(State.Settings.AsJ());
         }
 
         public Task SetAsync(J<JsonObject> settings)
         {
-            state.Settings = settings;
+            State.Settings = settings;
 
-            return persistence.WriteSnapshotAsync(state);
+            return WriteStateAsync();
         }
 
         public Task SetAsync(string path, J<IJsonValue> value)
@@ -64,7 +52,7 @@ namespace Squidex.Domain.Apps.Entities.Apps
 
             container[key] = value.Value;
 
-            return persistence.WriteSnapshotAsync(state);
+            return WriteStateAsync();
         }
 
         public Task RemoveAsync(string path)
@@ -76,7 +64,7 @@ namespace Squidex.Domain.Apps.Entities.Apps
                 container.Remove(key);
             }
 
-            return persistence.WriteSnapshotAsync(state);
+            return WriteStateAsync();
         }
 
         private JsonObject GetContainer(string path, out string key)
@@ -87,7 +75,7 @@ namespace Squidex.Domain.Apps.Entities.Apps
 
             key = segments[segments.Length - 1];
 
-            var current = state.Settings;
+            var current = State.Settings;
 
             if (segments.Length > 1)
             {

src/Squidex.Domain.Apps.Entities/Apps/Indexes/AppsByNameIndexGrain.cs

@@ -9,56 +9,39 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
-using Squidex.Infrastructure;
-using Squidex.Infrastructure.Orleans;
 using Squidex.Infrastructure.States;
 using Squidex.Infrastructure.Tasks;
 
 namespace Squidex.Domain.Apps.Entities.Apps.Indexes
 {
-    public sealed class AppsByNameIndexGrain : GrainOfString, IAppsByNameIndex
+    public sealed class AppsByNameIndexGrain : GrainOfString<AppsByNameIndexGrain.GrainState>, IAppsByNameIndex
     {
-        private readonly IStore<string> store;
         private readonly HashSet<Guid> reservedIds = new HashSet<Guid>();
         private readonly HashSet<string> reservedNames = new HashSet<string>();
-        private IPersistence<State> persistence;
-        private State state = new State();
 
         [CollectionName("Index_AppsByName")]
-        public sealed class State
+        public sealed class GrainState
         {
             public Dictionary<string, Guid> Apps { get; set; } = new Dictionary<string, Guid>();
         }
 
         public AppsByNameIndexGrain(IStore<string> store)
+            : base(store)
         {
-            Guard.NotNull(store, nameof(store));
-
-            this.store = store;
-        }
-
-        public override Task OnActivateAsync(string key)
-        {
-            persistence = store.WithSnapshots<AppsByNameIndexGrain, State, string>(key, s =>
-            {
-                state = s;
-            });
-
-            return persistence.ReadAsync();
         }
 
         public Task RebuildAsync(Dictionary<string, Guid> apps)
         {
-            state = new State { Apps = apps };
+            State = new GrainState { Apps = apps };
 
-            return persistence.WriteSnapshotAsync(state);
+            return WriteStateAsync();
         }
 
         public Task<bool> ReserveAppAsync(Guid appId, string name)
         {
             var canReserve =
-                !state.Apps.ContainsKey(name) &&
-                !state.Apps.Any(x => x.Value == appId) &&
+                !State.Apps.ContainsKey(name) &&
+                !State.Apps.Any(x => x.Value == appId) &&
                 !reservedIds.Contains(appId) &&
                 !reservedNames.Contains(name);
 
@@ -81,27 +64,27 @@ namespace Squidex.Domain.Apps.Entities.Apps.Indexes
 
         public Task AddAppAsync(Guid appId, string name)
         {
-            state.Apps[name] = appId;
+            State.Apps[name] = appId;
 
             reservedIds.Remove(appId);
             reservedNames.Remove(name);
 
-            return persistence.WriteSnapshotAsync(state);
+            return WriteStateAsync();
         }
 
         public Task RemoveAppAsync(Guid appId)
         {
-            var name = state.Apps.FirstOrDefault(x => x.Value == appId).Key;
+            var name = State.Apps.FirstOrDefault(x => x.Value == appId).Key;
 
             if (!string.IsNullOrWhiteSpace(name))
             {
-                state.Apps.Remove(name);
+                State.Apps.Remove(name);
 
                 reservedIds.Remove(appId);
                 reservedNames.Remove(name);
             }
 
-            return persistence.WriteSnapshotAsync(state);
+            return WriteStateAsync();
         }
 
         public Task<List<Guid>> GetAppIdsAsync(params string[] names)
@@ -110,7 +93,7 @@ namespace Squidex.Domain.Apps.Entities.Apps.Indexes
 
             foreach (var appName in names)
             {
-                if (state.Apps.TryGetValue(appName, out var appId))
+                if (State.Apps.TryGetValue(appName, out var appId))
                 {
                     appIds.Add(appId);
                 }
@@ -121,19 +104,19 @@ namespace Squidex.Domain.Apps.Entities.Apps.Indexes
 
         public Task<Guid> GetAppIdAsync(string appName)
         {
-            state.Apps.TryGetValue(appName, out var appId);
+            State.Apps.TryGetValue(appName, out var appId);
 
             return Task.FromResult(appId);
         }
 
         public Task<List<Guid>> GetAppIdsAsync()
         {
-            return Task.FromResult(state.Apps.Values.ToList());
+            return Task.FromResult(State.Apps.Values.ToList());
         }
 
         public Task<long> CountAsync()
         {
-            return Task.FromResult((long)state.Apps.Count);
+            return Task.FromResult((long)State.Apps.Count);
         }
     }
 }

src/Squidex.Domain.Apps.Entities/Apps/Indexes/AppsByUserIndexGrain.cs

@@ -9,65 +9,47 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
-using Squidex.Infrastructure;
-using Squidex.Infrastructure.Orleans;
 using Squidex.Infrastructure.States;
 
 namespace Squidex.Domain.Apps.Entities.Apps.Indexes
 {
-    public sealed class AppsByUserIndexGrain : GrainOfString, IAppsByUserIndex
+    public sealed class AppsByUserIndexGrain : GrainOfString<AppsByUserIndexGrain.GrainState>, IAppsByUserIndex
     {
-        private readonly IStore<string> store;
-        private IPersistence<State> persistence;
-        private State state = new State();
-
         [CollectionName("Index_AppsByUser")]
-        public sealed class State
+        public sealed class GrainState
         {
             public HashSet<Guid> Apps { get; set; } = new HashSet<Guid>();
         }
 
         public AppsByUserIndexGrain(IStore<string> store)
+            : base(store)
         {
-            Guard.NotNull(store, nameof(store));
-
-            this.store = store;
-        }
-
-        public override Task OnActivateAsync(string key)
-        {
-            persistence = store.WithSnapshots<AppsByUserIndexGrain, State, string>(key, s =>
-            {
-                state = s;
-            });
-
-            return persistence.ReadAsync();
         }
 
         public Task RebuildAsync(HashSet<Guid> apps)
         {
-            state = new State { Apps = apps };
+            State = new GrainState { Apps = apps };
 
-            return persistence.WriteSnapshotAsync(state);
+            return WriteStateAsync();
         }
 
         public Task AddAppAsync(Guid appId)
         {
-            state.Apps.Add(appId);
+            State.Apps.Add(appId);
 
-            return persistence.WriteSnapshotAsync(state);
+            return WriteStateAsync();
         }
 
         public Task RemoveAppAsync(Guid appId)
         {
-            state.Apps.Remove(appId);
+            State.Apps.Remove(appId);
 
-            return persistence.WriteSnapshotAsync(state);
+            return WriteStateAsync();
         }
 
         public Task<List<Guid>> GetAppIdsAsync()
         {
-            return Task.FromResult(state.Apps.ToList());
+            return Task.FromResult(State.Apps.ToList());
         }
     }
 }

src/Squidex.Domain.Apps.Entities/Backup/BackupGrain.cs

@@ -12,6 +12,7 @@ using System.Threading;
 using System.Threading.Tasks;
 using NodaTime;
 using Orleans.Concurrency;
+using Squidex.Domain.Apps.Entities.Apps.Indexes;
 using Squidex.Domain.Apps.Entities.Backup.Helpers;
 using Squidex.Domain.Apps.Entities.Backup.State;
 using Squidex.Domain.Apps.Events;
@@ -27,7 +28,7 @@ using Squidex.Infrastructure.Tasks;
 namespace Squidex.Domain.Apps.Entities.Backup
 {
     [Reentrant]
-    public sealed class BackupGrain : GrainOfGuid, IBackupGrain
+    public sealed class BackupGrain : GrainOfGuid<BackupState>, IBackupGrain
     {
         private const int MaxBackups = 10;
         private static readonly Duration UpdateDuration = Duration.FromSeconds(1);
@@ -39,12 +40,8 @@ namespace Squidex.Domain.Apps.Entities.Backup
         private readonly IEventDataFormatter eventDataFormatter;
         private readonly IEventStore eventStore;
         private readonly ISemanticLog log;
-        private readonly IStore<Guid> store;
         private CancellationTokenSource currentTask;
         private BackupStateJob currentJob;
-        private BackupState state = new BackupState();
-        private Guid appId;
-        private IPersistence<BackupState> persistence;
 
         public BackupGrain(
             IAssetStore assetStore,
@@ -56,6 +53,7 @@ namespace Squidex.Domain.Apps.Entities.Backup
             IJsonSerializer serializer,
             ISemanticLog log,
             IStore<Guid> store)
+            : base(store)
         {
             Guard.NotNull(assetStore, nameof(assetStore));
             Guard.NotNull(backupArchiveLocation, nameof(backupArchiveLocation));
@@ -64,7 +62,6 @@ namespace Squidex.Domain.Apps.Entities.Backup
             Guard.NotNull(eventDataFormatter, nameof(eventDataFormatter));
             Guard.NotNull(handlers, nameof(handlers));
             Guard.NotNull(serializer, nameof(serializer));
-            Guard.NotNull(store, nameof(store));
             Guard.NotNull(log, nameof(log));
 
             this.assetStore = assetStore;
@@ -74,29 +71,19 @@ namespace Squidex.Domain.Apps.Entities.Backup
             this.eventDataFormatter = eventDataFormatter;
             this.handlers = handlers;
             this.serializer = serializer;
-            this.store = store;
             this.log = log;
         }
 
-        public override async Task OnActivateAsync(Guid key)
-        {
-            appId = key;
-
-            persistence = store.WithSnapshots<BackupState, Guid>(GetType(), key, s => state = s);
-
-            await ReadAsync();
-
-            RecoverAfterRestart();
-        }
-
-        private void RecoverAfterRestart()
+        protected override Task OnActivateAsync(Guid key)
         {
             RecoverAfterRestartAsync().Forget();
+
+            return TaskHelper.Done;
         }
 
         private async Task RecoverAfterRestartAsync()
         {
-            foreach (var job in state.Jobs)
+            foreach (var job in State.Jobs)
             {
                 if (!job.Stopped.HasValue)
                 {
@@ -107,7 +94,7 @@ namespace Squidex.Domain.Apps.Entities.Backup
 
                     job.Status = JobStatus.Failed;
 
-                    await WriteAsync();
+                    await WriteStateAsync();
                 }
             }
         }
@@ -119,7 +106,7 @@ namespace Squidex.Domain.Apps.Entities.Backup
                 throw new DomainException("Another backup process is already running.");
             }
 
-            if (state.Jobs.Count >= MaxBackups)
+            if (State.Jobs.Count >= MaxBackups)
             {
                 throw new DomainException($"You cannot have more than {MaxBackups} backups.");
             }
@@ -136,9 +123,9 @@ namespace Squidex.Domain.Apps.Entities.Backup
 
             var lastTimestamp = job.Started;
 
-            state.Jobs.Insert(0, job);
+            State.Jobs.Insert(0, job);
 
-            await WriteAsync();
+            await WriteStateAsync();
 
             try
             {
@@ -154,23 +141,23 @@ namespace Squidex.Domain.Apps.Entities.Backup
 
                             foreach (var handler in handlers)
                             {
-                                await handler.BackupEventAsync(@event, appId, writer);
+                                await handler.BackupEventAsync(@event, Key, writer);
                             }
 
                             job.HandledEvents = writer.WrittenEvents;
                             job.HandledAssets = writer.WrittenAttachments;
 
                             lastTimestamp = await WritePeriodically(lastTimestamp);
-                        }, SquidexHeaders.AppId, appId.ToString(), null, currentTask.Token);
+                        }, SquidexHeaders.AppId, Key.ToString(), null, currentTask.Token);
 
                         foreach (var handler in handlers)
                         {
-                            await handler.BackupAsync(appId, writer);
+                            await handler.BackupAsync(Key, writer);
                         }
 
                         foreach (var handler in handlers)
                         {
-                            await handler.CompleteBackupAsync(appId, writer);
+                            await handler.CompleteBackupAsync(Key, writer);
                         }
                     }
 
@@ -198,7 +185,7 @@ namespace Squidex.Domain.Apps.Entities.Backup
 
                 job.Stopped = clock.GetCurrentInstant();
 
-                await WriteAsync();
+                await WriteStateAsync();
 
                 currentTask = null;
                 currentJob = null;
@@ -213,7 +200,7 @@ namespace Squidex.Domain.Apps.Entities.Backup
             {
                 lastTimestamp = now;
 
-                await WriteAsync();
+                await WriteStateAsync();
             }
 
             return lastTimestamp;
@@ -221,7 +208,7 @@ namespace Squidex.Domain.Apps.Entities.Backup
 
         public async Task DeleteAsync(Guid id)
         {
-            var job = state.Jobs.FirstOrDefault(x => x.Id == id);
+            var job = State.Jobs.FirstOrDefault(x => x.Id == id);
 
             if (job == null)
             {
@@ -237,25 +224,15 @@ namespace Squidex.Domain.Apps.Entities.Backup
                 await Safe.DeleteAsync(backupArchiveLocation, job.Id, log);
                 await Safe.DeleteAsync(assetStore, job.Id, log);
 
-                state.Jobs.Remove(job);
+                State.Jobs.Remove(job);
 
-                await WriteAsync();
+                await WriteStateAsync();
             }
         }
 
         public Task<J<List<IBackupJob>>> GetStateAsync()
         {
-            return J.AsTask(state.Jobs.OfType<IBackupJob>().ToList());
-        }
-
-        private async Task ReadAsync()
-        {
-            await persistence.ReadAsync();
-        }
-
-        private async Task WriteAsync()
-        {
-            await persistence.WriteSnapshotAsync(state);
+            return J.AsTask(State.Jobs.OfType<IBackupJob>().ToList());
         }
     }
 }

src/Squidex.Domain.Apps.Entities/Backup/RestoreGrain.cs

@@ -11,6 +11,7 @@ using System.Threading.Tasks;
 using NodaTime;
 using Squidex.Domain.Apps.Core.Apps;
 using Squidex.Domain.Apps.Entities.Apps.Commands;
+using Squidex.Domain.Apps.Entities.Apps.Indexes;
 using Squidex.Domain.Apps.Entities.Backup.Helpers;
 using Squidex.Domain.Apps.Entities.Backup.State;
 using Squidex.Domain.Apps.Events;
@@ -26,7 +27,7 @@ using Squidex.Infrastructure.Tasks;
 
 namespace Squidex.Domain.Apps.Entities.Backup
 {
-    public sealed class RestoreGrain : GrainOfString, IRestoreGrain
+    public sealed class RestoreGrain : GrainOfString<RestoreState>, IRestoreGrain
     {
         private readonly IBackupArchiveLocation backupArchiveLocation;
         private readonly IClock clock;
@@ -37,14 +38,11 @@ namespace Squidex.Domain.Apps.Entities.Backup
         private readonly IEventDataFormatter eventDataFormatter;
         private readonly ISemanticLog log;
         private readonly IStreamNameResolver streamNameResolver;
-        private readonly IStore<string> store;
         private RefToken actor;
-        private RestoreState state = new RestoreState();
-        private IPersistence<RestoreState> persistence;
 
         private RestoreStateJob CurrentJob
         {
-            get { return state.Job; }
+            get { return State.Job; }
         }
 
         public RestoreGrain(IBackupArchiveLocation backupArchiveLocation,
@@ -57,6 +55,7 @@ namespace Squidex.Domain.Apps.Entities.Backup
             ISemanticLog log,
             IStreamNameResolver streamNameResolver,
             IStore<string> store)
+            : base(store)
         {
             Guard.NotNull(backupArchiveLocation, nameof(backupArchiveLocation));
             Guard.NotNull(clock, nameof(clock));
@@ -76,25 +75,17 @@ namespace Squidex.Domain.Apps.Entities.Backup
             this.eventDataFormatter = eventDataFormatter;
             this.handlers = handlers;
             this.serializer = serializer;
-            this.store = store;
             this.streamNameResolver = streamNameResolver;
             this.log = log;
         }
 
-        public override async Task OnActivateAsync(string key)
+        protected override Task OnActivateAsync(string key)
         {
             actor = new RefToken(RefTokenType.Subject, key);
 
-            persistence = store.WithSnapshots<RestoreState, string>(GetType(), key, s => state = s);
-
-            await ReadAsync();
-
-            RecoverAfterRestart();
-        }
-
-        private void RecoverAfterRestart()
-        {
             RecoverAfterRestartAsync().Forget();
+
+            return TaskHelper.Done;
         }
 
         private async Task RecoverAfterRestartAsync()
@@ -106,7 +97,7 @@ namespace Squidex.Domain.Apps.Entities.Backup
                 CurrentJob.Status = JobStatus.Failed;
 
                 await CleanupAsync();
-                await WriteAsync();
+                await WriteStateAsync();
             }
         }
 
@@ -124,7 +115,7 @@ namespace Squidex.Domain.Apps.Entities.Backup
                 throw new DomainException("A restore operation is already running.");
             }
 
-            state.Job = new RestoreStateJob
+            State.Job = new RestoreStateJob
             {
                 Id = Guid.NewGuid(),
                 NewAppName = newAppName,
@@ -239,7 +230,7 @@ namespace Squidex.Domain.Apps.Entities.Backup
                 {
                     CurrentJob.Stopped = clock.GetCurrentInstant();
 
-                    await WriteAsync();
+                    await WriteStateAsync();
                 }
             }
         }
@@ -340,16 +331,6 @@ namespace Squidex.Domain.Apps.Entities.Backup
             }
         }
 
-        private async Task ReadAsync()
-        {
-            await persistence.ReadAsync();
-        }
-
-        private async Task WriteAsync()
-        {
-            await persistence.WriteSnapshotAsync(state);
-        }
-
         public Task<J<IRestoreJob>> GetJobAsync()
         {
             return Task.FromResult<J<IRestoreJob>>(CurrentJob);

src/Squidex.Domain.Apps.Entities/Rules/Indexes/RulesByAppIndexGrain.cs

@@ -9,72 +9,53 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
-using Squidex.Infrastructure;
-using Squidex.Infrastructure.Orleans;
+using Squidex.Domain.Apps.Entities.Apps.Indexes;
 using Squidex.Infrastructure.States;
 
 namespace Squidex.Domain.Apps.Entities.Rules.Indexes
 {
-    public sealed class RulesByAppIndexGrain : GrainOfGuid, IRulesByAppIndex
+    public sealed class RulesByAppIndexGrain : GrainOfGuid<RulesByAppIndexGrain.GrainState>, IRulesByAppIndex
     {
-        private readonly IStore<Guid> store;
-        private IPersistence<State> persistence;
-        private State state = new State();
-
         [CollectionName("Index_RulesByApp")]
-        public sealed class State
+        public sealed class GrainState
         {
             public HashSet<Guid> Rules { get; set; } = new HashSet<Guid>();
         }
 
         public RulesByAppIndexGrain(IStore<Guid> store)
+            : base(store)
         {
-            Guard.NotNull(store, nameof(store));
-
-            this.store = store;
-        }
-
-        public override Task OnActivateAsync(Guid key)
-        {
-            persistence = store.WithSnapshots<RulesByAppIndexGrain, State, Guid>(key, s =>
-            {
-                state = s;
-            });
-
-            return persistence.ReadAsync();
         }
 
         public Task ClearAsync()
         {
-            state = new State();
-
-            return persistence.DeleteAsync();
+            return ClearStateAsync();
         }
 
         public Task RebuildAsync(HashSet<Guid> rules)
         {
-            state = new State { Rules = rules };
+            State = new GrainState { Rules = rules };
 
-            return persistence.WriteSnapshotAsync(state);
+            return WriteStateAsync();
         }
 
         public Task AddRuleAsync(Guid ruleId)
         {
-            state.Rules.Add(ruleId);
+            State.Rules.Add(ruleId);
 
-            return persistence.WriteSnapshotAsync(state);
+            return WriteStateAsync();
         }
 
         public Task RemoveRuleAsync(Guid ruleId)
         {
-            state.Rules.Remove(ruleId);
+            State.Rules.Remove(ruleId);
 
-            return persistence.WriteSnapshotAsync(state);
+            return WriteStateAsync();
         }
 
         public Task<List<Guid>> GetRuleIdsAsync()
         {
-            return Task.FromResult(state.Rules.ToList());
+            return Task.FromResult(State.Rules.ToList());
         }
     }
 }

src/Squidex.Domain.Apps.Entities/Schemas/Indexes/SchemasByAppIndexGrain.cs

@@ -9,79 +9,60 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
-using Squidex.Infrastructure;
-using Squidex.Infrastructure.Orleans;
+using Squidex.Domain.Apps.Entities.Apps.Indexes;
 using Squidex.Infrastructure.States;
 
 namespace Squidex.Domain.Apps.Entities.Schemas.Indexes
 {
-    public sealed class SchemasByAppIndexGrain : GrainOfGuid, ISchemasByAppIndex
+    public sealed class SchemasByAppIndexGrain : GrainOfGuid<SchemasByAppIndexGrain.GrainState>, ISchemasByAppIndex
     {
-        private readonly IStore<Guid> store;
-        private IPersistence<State> persistence;
-        private State state = new State();
-
         [CollectionName("Index_SchemasByApp")]
-        public sealed class State
+        public sealed class GrainState
         {
             public Dictionary<string, Guid> Schemas { get; set; } = new Dictionary<string, Guid>();
         }
 
         public SchemasByAppIndexGrain(IStore<Guid> store)
+            : base(store)
         {
-            Guard.NotNull(store, nameof(store));
-
-            this.store = store;
-        }
-
-        public override Task OnActivateAsync(Guid key)
-        {
-            persistence = store.WithSnapshots<SchemasByAppIndexGrain, State, Guid>(key, s =>
-            {
-                state = s;
-            });
-
-            return persistence.ReadAsync();
         }
 
         public Task ClearAsync()
         {
-            state = new State();
-
-            return persistence.DeleteAsync();
+            return ClearStateAsync();
         }
 
         public Task RebuildAsync(Dictionary<string, Guid> schemas)
         {
-            state = new State { Schemas = schemas };
+            State = new GrainState { Schemas = schemas };
 
-            return persistence.WriteSnapshotAsync(state);
+            return WriteStateAsync();
         }
 
         public Task AddSchemaAsync(Guid schemaId, string name)
         {
-            state.Schemas[name] = schemaId;
+            State.Schemas[name] = schemaId;
 
-            return persistence.WriteSnapshotAsync(state);
+            return WriteStateAsync();
         }
 
         public Task RemoveSchemaAsync(Guid schemaId)
         {
-            state.Schemas.Remove(state.Schemas.FirstOrDefault(x => x.Value == schemaId).Key ?? string.Empty);
+            State.Schemas.Remove(State.Schemas.FirstOrDefault(x => x.Value == schemaId).Key ?? string.Empty);
 
-            return persistence.WriteSnapshotAsync(state);
+            return WriteStateAsync();
         }
 
         public Task<Guid> GetSchemaIdAsync(string name)
         {
-            state.Schemas.TryGetValue(name, out var schemaId);
+            State.Schemas.TryGetValue(name, out var schemaId);
 
             return Task.FromResult(schemaId);
         }
 
         public Task<List<Guid>> GetSchemaIdsAsync()
         {
-            return Task.FromResult(state.Schemas.Values.ToList());
+            return Task.FromResult(State.Schemas.Values.ToList());
         }
     }
 }

src/Squidex.Domain.Apps.Entities/Tags/TagGrain.cs

@@ -10,53 +10,34 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
 using Squidex.Domain.Apps.Core.Tags;
-using Squidex.Infrastructure;
-using Squidex.Infrastructure.Orleans;
+using Squidex.Domain.Apps.Entities.Apps.Indexes;
 using Squidex.Infrastructure.States;
 
 namespace Squidex.Domain.Apps.Entities.Tags
 {
-    public sealed class TagGrain : GrainOfString, ITagGrain
+    public sealed class TagGrain : GrainOfString<TagGrain.GrainState>, ITagGrain
     {
-        private readonly IStore<string> store;
-        private IPersistence<State> persistence;
-        private State state = new State();
-
         [CollectionName("Index_Tags")]
-        public sealed class State
+        public sealed class GrainState
         {
             public TagSet Tags { get; set; } = new TagSet();
         }
 
         public TagGrain(IStore<string> store)
+            : base(store)
         {
-            Guard.NotNull(store, nameof(store));
-
-            this.store = store;
-        }
-
-        public override Task OnActivateAsync(string key)
-        {
-            persistence = store.WithSnapshots<TagGrain, State, string>(key, s =>
-            {
-                state = s;
-            });
-
-            return persistence.ReadAsync();
         }
 
         public Task ClearAsync()
         {
-            state = new State();
-
-            return persistence.DeleteAsync();
+            return ClearStateAsync();
         }
 
         public Task RebuildAsync(TagSet tags)
         {
-            state.Tags = tags;
+            State.Tags = tags;
 
-            return persistence.WriteSnapshotAsync(state);
+            return WriteStateAsync();
         }
 
         public async Task<Dictionary<string, string>> NormalizeTagsAsync(HashSet<string> names, HashSet<string> ids)
@@ -72,7 +53,7 @@ namespace Squidex.Domain.Apps.Entities.Tags
                         var tagName = tag.ToLowerInvariant();
                         var tagId = string.Empty;
 
-                        var found = state.Tags.FirstOrDefault(x => string.Equals(x.Value.Name, tagName, StringComparison.OrdinalIgnoreCase));
+                        var found = State.Tags.FirstOrDefault(x => string.Equals(x.Value.Name, tagName, StringComparison.OrdinalIgnoreCase));
 
                         if (found.Value != null)
                         {
@@ -87,7 +68,7 @@ namespace Squidex.Domain.Apps.Entities.Tags
                         {
                             tagId = Guid.NewGuid().ToString();
 
-                            state.Tags.Add(tagId, new Tag { Name = tagName });
+                            State.Tags.Add(tagId, new Tag { Name = tagName });
                         }
 
                         result.Add(tagName, tagId);
@@ -101,20 +82,20 @@ namespace Squidex.Domain.Apps.Entities.Tags
                 {
                     if (!result.ContainsValue(id))
                     {
-                        if (state.Tags.TryGetValue(id, out var tagInfo))
+                        if (State.Tags.TryGetValue(id, out var tagInfo))
                         {
                             tagInfo.Count--;
 
                             if (tagInfo.Count <= 0)
                             {
-                                state.Tags.Remove(id);
+                                State.Tags.Remove(id);
                             }
                         }
                     }
                 }
             }
 
-            await persistence.WriteSnapshotAsync(state);
+            await WriteStateAsync();
 
             return result;
         }
@@ -125,7 +106,7 @@ namespace Squidex.Domain.Apps.Entities.Tags
 
             foreach (var name in names)
             {
-                var id = state.Tags.FirstOrDefault(x => string.Equals(x.Value.Name, name, StringComparison.OrdinalIgnoreCase)).Key;
+                var id = State.Tags.FirstOrDefault(x => string.Equals(x.Value.Name, name, StringComparison.OrdinalIgnoreCase)).Key;
 
                 if (!string.IsNullOrWhiteSpace(id))
                 {
@@ -142,7 +123,7 @@ namespace Squidex.Domain.Apps.Entities.Tags
 
             foreach (var id in ids)
             {
-                if (state.Tags.TryGetValue(id, out var tagInfo))
+                if (State.Tags.TryGetValue(id, out var tagInfo))
                 {
                     result[id] = tagInfo.Name;
                 }
@@ -153,12 +134,12 @@ namespace Squidex.Domain.Apps.Entities.Tags
 
         public Task<Dictionary<string, int>> GetTagsAsync()
         {
-            return Task.FromResult(state.Tags.Values.ToDictionary(x => x.Name, x => x.Count));
+            return Task.FromResult(State.Tags.Values.ToDictionary(x => x.Name, x => x.Count));
         }
 
         public Task<TagSet> GetExportableTagsAsync()
         {
-            return Task.FromResult(state.Tags);
+            return Task.FromResult(State.Tags);
         }
     }
 }

src/Squidex.Infrastructure/Commands/DomainObjectGrainBase.cs

@@ -47,7 +47,7 @@ namespace Squidex.Infrastructure.Commands
             this.log = log;
         }
 
-        public sealed override async Task OnActivateAsync(Guid key)
+        protected sealed override async Task OnActivateAsync(Guid key)
         {
             using (log.MeasureInformation(w => w
                 .WriteProperty("action", "ActivateDomainObject")

src/Squidex.Infrastructure/EventSourcing/Grains/EventConsumerGrain.cs

@@ -50,7 +50,7 @@ namespace Squidex.Infrastructure.EventSourcing.Grains
             this.eventConsumerFactory = eventConsumerFactory;
         }
 
-        public override Task OnActivateAsync(string key)
+        protected override Task OnActivateAsync(string key)
         {
             scheduler = TaskScheduler.Current;
 

src/Squidex.Infrastructure/Orleans/GrainOfGuid.cs

@@ -14,12 +14,21 @@ namespace Squidex.Infrastructure.Orleans
 {
     public abstract class GrainOfGuid : Grain
     {
+        public Guid Key { get; private set; }
+
         public sealed override Task OnActivateAsync()
         {
-            return OnActivateAsync(this.GetPrimaryKey());
+            return ActivateAsync(this.GetPrimaryKey());
+        }
+
+        public Task ActivateAsync(Guid key)
+        {
+            Key = key;
+
+            return OnActivateAsync(key);
         }
 
-        public virtual Task OnActivateAsync(Guid key)
+        protected virtual Task OnActivateAsync(Guid key)
         {
             return TaskHelper.Done;
         }

src/Squidex.Infrastructure/Orleans/GrainOfGuid{T}.cs

@@ -0,0 +1,71 @@
+// ==========================================================================
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex UG (haftungsbeschraenkt)
+//  All rights reserved. Licensed under the MIT license.
+// ==========================================================================
+
+using System;
+using System.Threading.Tasks;
+using Orleans;
+using Squidex.Infrastructure;
+using Squidex.Infrastructure.States;
+using Squidex.Infrastructure.Tasks;
+
+namespace Squidex.Domain.Apps.Entities.Apps.Indexes
+{
+    public abstract class GrainOfGuid<T> : Grain where T : class, new()
+    {
+        private readonly IStore<Guid> store;
+        private IPersistence<T> persistence;
+
+        protected T State { get; set; }
+
+        public Guid Key { get; private set; }
+
+        protected GrainOfGuid(IStore<Guid> store)
+        {
+            Guard.NotNull(store, nameof(store));
+
+            this.store = store;
+        }
+
+        public sealed override Task OnActivateAsync()
+        {
+            return ActivateAsync(this.GetPrimaryKey());
+        }
+
+        public async Task ActivateAsync(Guid key)
+        {
+            Key = key;
+
+            persistence = store.WithSnapshots<T, Guid>(GetType(), key, ApplyState);
+
+            await persistence.ReadAsync();
+
+            await OnActivateAsync(key);
+        }
+
+        protected virtual Task OnActivateAsync(Guid key)
+        {
+            return TaskHelper.Done;
+        }
+
+        private void ApplyState(T state)
+        {
+            State = state;
+        }
+
+        public Task ClearStateAsync()
+        {
+            State = new T();
+
+            return persistence.DeleteAsync();
+        }
+
+        protected Task WriteStateAsync()
+        {
+            return persistence.WriteSnapshotAsync(State);
+        }
+    }
+}

src/Squidex.Infrastructure/Orleans/GrainOfString.cs

@@ -13,12 +13,21 @@ namespace Squidex.Infrastructure.Orleans
 {
     public abstract class GrainOfString : Grain
     {
+        public string Key { get; private set; }
+
         public sealed override Task OnActivateAsync()
         {
-            return OnActivateAsync(this.GetPrimaryKeyString());
+            return ActivateAsync(this.GetPrimaryKeyString());
+        }
+
+        public Task ActivateAsync(string key)
+        {
+            Key = key;
+
+            return OnActivateAsync(key);
         }
 
-        public virtual Task OnActivateAsync(string key)
+        protected virtual Task OnActivateAsync(string key)
         {
             return TaskHelper.Done;
         }

src/Squidex.Infrastructure/Orleans/GrainOfString{T}.cs

@@ -0,0 +1,70 @@
+// ==========================================================================
+//  Squidex Headless CMS
+// ==========================================================================
+//  Copyright (c) Squidex UG (haftungsbeschraenkt)
+//  All rights reserved. Licensed under the MIT license.
+// ==========================================================================
+
+using System.Threading.Tasks;
+using Orleans;
+using Squidex.Infrastructure;
+using Squidex.Infrastructure.States;
+using Squidex.Infrastructure.Tasks;
+
+namespace Squidex.Domain.Apps.Entities.Apps.Indexes
+{
+    public abstract class GrainOfString<T> : Grain where T : class, new()
+    {
+        private readonly IStore<string> store;
+        private IPersistence<T> persistence;
+
+        public string Key { get; set; }
+
+        protected T State { get; set; }
+
+        protected GrainOfString(IStore<string> store)
+        {
+            Guard.NotNull(store, nameof(store));
+
+            this.store = store;
+        }
+
+        public sealed override Task OnActivateAsync()
+        {
+            return ActivateAsync(this.GetPrimaryKeyString());
+        }
+
+        public async Task ActivateAsync(string key)
+        {
+            Key = key;
+
+            persistence = store.WithSnapshots<T, string>(GetType(), key, ApplyState);
+
+            await persistence.ReadAsync();
+
+            await OnActivateAsync(key);
+        }
+
+        protected virtual Task OnActivateAsync(string key)
+        {
+            return TaskHelper.Done;
+        }
+
+        private void ApplyState(T state)
+        {
+            State = state;
+        }
+
+        public Task ClearStateAsync()
+        {
+            State = new T();
+
+            return persistence.DeleteAsync();
+        }
+
+        protected Task WriteStateAsync()
+        {
+            return persistence.WriteSnapshotAsync(State);
+        }
+    }
+}

tests/Squidex.Domain.Apps.Entities.Tests/Apps/AppGrainTests.cs

@@ -60,7 +60,7 @@ namespace Squidex.Domain.Apps.Entities.Apps
             };
 
             sut = new AppGrain(initialPatterns, Store, A.Dummy<ISemanticLog>(), appPlansProvider, appPlansBillingManager, userResolver);
-            sut.OnActivateAsync(Id).Wait();
+            sut.ActivateAsync(Id).Wait();
         }
 
         [Fact]

tests/Squidex.Domain.Apps.Entities.Tests/Apps/AppUISettingsGrainTests.cs

@@ -18,16 +18,16 @@ namespace Squidex.Domain.Apps.Entities.Apps
     public sealed class AppUISettingsGrainTests
     {
         private readonly IStore<Guid> store = A.Fake<IStore<Guid>>();
-        private readonly IPersistence<AppUISettingsGrain.State> persistence = A.Fake<IPersistence<AppUISettingsGrain.State>>();
+        private readonly IPersistence<AppUISettingsGrain.GrainState> persistence = A.Fake<IPersistence<AppUISettingsGrain.GrainState>>();
         private readonly AppUISettingsGrain sut;
 
         public AppUISettingsGrainTests()
         {
-            A.CallTo(() => store.WithSnapshots(A<Type>.Ignored, A<Guid>.Ignored, A<Func<AppUISettingsGrain.State, Task>>.Ignored))
+            A.CallTo(() => store.WithSnapshots(A<Type>.Ignored, A<Guid>.Ignored, A<Func<AppUISettingsGrain.GrainState, Task>>.Ignored))
                 .Returns(persistence);
 
             sut = new AppUISettingsGrain(store);
-            sut.OnActivateAsync(Guid.Empty).Wait();
+            sut.ActivateAsync(Guid.Empty).Wait();
         }
 
         [Fact]

tests/Squidex.Domain.Apps.Entities.Tests/Apps/Indexes/AppsByNameIndexGrainTests.cs

@@ -18,7 +18,7 @@ namespace Squidex.Domain.Apps.Entities.Apps.Indexes
     public class AppsByNameIndexGrainTests
     {
         private readonly IStore<string> store = A.Fake<IStore<string>>();
-        private readonly IPersistence<AppsByNameIndexGrain.State> persistence = A.Fake<IPersistence<AppsByNameIndexGrain.State>>();
+        private readonly IPersistence<AppsByNameIndexGrain.GrainState> persistence = A.Fake<IPersistence<AppsByNameIndexGrain.GrainState>>();
         private readonly Guid appId1 = Guid.NewGuid();
         private readonly Guid appId2 = Guid.NewGuid();
         private readonly string appName1 = "my-app1";
@@ -27,11 +27,11 @@ namespace Squidex.Domain.Apps.Entities.Apps.Indexes
 
         public AppsByNameIndexGrainTests()
         {
-            A.CallTo(() => store.WithSnapshots(A<Type>.Ignored, A<string>.Ignored, A<Func<AppsByNameIndexGrain.State, Task>>.Ignored))
+            A.CallTo(() => store.WithSnapshots(A<Type>.Ignored, A<string>.Ignored, A<Func<AppsByNameIndexGrain.GrainState, Task>>.Ignored))
                 .Returns(persistence);
 
             sut = new AppsByNameIndexGrain(store);
-            sut.OnActivateAsync(SingleGrain.Id).Wait();
+            sut.ActivateAsync(SingleGrain.Id).Wait();
         }
 
         [Fact]
@@ -43,7 +43,7 @@ namespace Squidex.Domain.Apps.Entities.Apps.Indexes
 
             Assert.Equal(appId1, result);
 
-            A.CallTo(() => persistence.WriteSnapshotAsync(A<AppsByNameIndexGrain.State>.Ignored))
+            A.CallTo(() => persistence.WriteSnapshotAsync(A<AppsByNameIndexGrain.GrainState>.Ignored))
                 .MustHaveHappened();
         }
 
@@ -126,7 +126,7 @@ namespace Squidex.Domain.Apps.Entities.Apps.Indexes
 
             Assert.Equal(Guid.Empty, result);
 
-            A.CallTo(() => persistence.WriteSnapshotAsync(A<AppsByNameIndexGrain.State>.Ignored))
+            A.CallTo(() => persistence.WriteSnapshotAsync(A<AppsByNameIndexGrain.GrainState>.Ignored))
                 .MustHaveHappenedTwiceExactly();
         }
 
@@ -148,7 +148,7 @@ namespace Squidex.Domain.Apps.Entities.Apps.Indexes
 
             Assert.Equal(2, await sut.CountAsync());
 
-            A.CallTo(() => persistence.WriteSnapshotAsync(A<AppsByNameIndexGrain.State>.Ignored))
+            A.CallTo(() => persistence.WriteSnapshotAsync(A<AppsByNameIndexGrain.GrainState>.Ignored))
                 .MustHaveHappened();
         }
     }

tests/Squidex.Domain.Apps.Entities.Tests/Apps/Indexes/AppsByUserIndexGrainTests.cs

@@ -18,18 +18,18 @@ namespace Squidex.Domain.Apps.Entities.Apps.Indexes
     public class AppsByUserIndexGrainTests
     {
         private readonly IStore<string> store = A.Fake<IStore<string>>();
-        private readonly IPersistence<AppsByUserIndexGrain.State> persistence = A.Fake<IPersistence<AppsByUserIndexGrain.State>>();
+        private readonly IPersistence<AppsByUserIndexGrain.GrainState> persistence = A.Fake<IPersistence<AppsByUserIndexGrain.GrainState>>();
         private readonly Guid appId1 = Guid.NewGuid();
         private readonly Guid appId2 = Guid.NewGuid();
         private readonly AppsByUserIndexGrain sut;
 
         public AppsByUserIndexGrainTests()
         {
-            A.CallTo(() => store.WithSnapshots(A<Type>.Ignored, A<string>.Ignored, A<Func<AppsByUserIndexGrain.State, Task>>.Ignored))
+            A.CallTo(() => store.WithSnapshots(A<Type>.Ignored, A<string>.Ignored, A<Func<AppsByUserIndexGrain.GrainState, Task>>.Ignored))
                 .Returns(persistence);
 
             sut = new AppsByUserIndexGrain(store);
-            sut.OnActivateAsync("user").Wait();
+            sut.ActivateAsync("user").Wait();
         }
 
         [Fact]
@@ -42,7 +42,7 @@ namespace Squidex.Domain.Apps.Entities.Apps.Indexes
 
             Assert.Equal(new List<Guid> { appId1, appId2 }, result);
 
-            A.CallTo(() => persistence.WriteSnapshotAsync(A<AppsByUserIndexGrain.State>.Ignored))
+            A.CallTo(() => persistence.WriteSnapshotAsync(A<AppsByUserIndexGrain.GrainState>.Ignored))
                 .MustHaveHappenedTwiceExactly();
         }
 
@@ -57,7 +57,7 @@ namespace Squidex.Domain.Apps.Entities.Apps.Indexes
 
             Assert.Equal(new List<Guid> { appId2 }, result);
 
-            A.CallTo(() => persistence.WriteSnapshotAsync(A<AppsByUserIndexGrain.State>.Ignored))
+            A.CallTo(() => persistence.WriteSnapshotAsync(A<AppsByUserIndexGrain.GrainState>.Ignored))
                 .MustHaveHappenedTwiceOrMore();
         }
 
@@ -72,7 +72,7 @@ namespace Squidex.Domain.Apps.Entities.Apps.Indexes
 
             Assert.Equal(new List<Guid> { appId1, appId2 }, result);
 
-            A.CallTo(() => persistence.WriteSnapshotAsync(A<AppsByUserIndexGrain.State>.Ignored))
+            A.CallTo(() => persistence.WriteSnapshotAsync(A<AppsByUserIndexGrain.GrainState>.Ignored))
                 .MustHaveHappened();
         }
     }

tests/Squidex.Domain.Apps.Entities.Tests/Assets/AssetCommandMiddlewareTests.cs

@@ -48,7 +48,7 @@ namespace Squidex.Domain.Apps.Entities.Assets
             file = new AssetFile("my-image.png", "image/png", 1024, () => stream);
 
             asset = new AssetGrain(Store, tagService, A.Dummy<ISemanticLog>());
-            asset.OnActivateAsync(Id).Wait();
+            asset.ActivateAsync(Id).Wait();
 
             A.CallTo(() => tagService.NormalizeTagsAsync(AppId, TagGroups.Assets, A<HashSet<string>>.Ignored, A<HashSet<string>>.Ignored))
                 .Returns(new Dictionary<string, string>());

tests/Squidex.Domain.Apps.Entities.Tests/Assets/AssetGrainTests.cs

@@ -42,7 +42,7 @@ namespace Squidex.Domain.Apps.Entities.Assets
                 .Returns(new Dictionary<string, string>());
 
             sut = new AssetGrain(Store, tagService, A.Dummy<ISemanticLog>());
-            sut.OnActivateAsync(Id).Wait();
+            sut.ActivateAsync(Id).Wait();
         }
 
         [Fact]

tests/Squidex.Domain.Apps.Entities.Tests/Comments/CommentsGrainTests.cs

@@ -37,7 +37,7 @@ namespace Squidex.Domain.Apps.Entities.Comments
         public CommentsGrainTests()
         {
             sut = new CommentsGrain(Store, A.Dummy<ISemanticLog>());
-            sut.OnActivateAsync(Id).Wait();
+            sut.ActivateAsync(Id).Wait();
         }
 
         [Fact]

tests/Squidex.Domain.Apps.Entities.Tests/Contents/ContentGrainTests.cs

@@ -98,7 +98,7 @@ namespace Squidex.Domain.Apps.Entities.Contents
             patched = patch.MergeInto(data);
 
             sut = new ContentGrain(Store, A.Dummy<ISemanticLog>(), appProvider, A.Dummy<IAssetRepository>(), scriptEngine, A.Dummy<IContentRepository>());
-            sut.OnActivateAsync(Id).Wait();
+            sut.ActivateAsync(Id).Wait();
         }
 
         [Fact]

tests/Squidex.Domain.Apps.Entities.Tests/Rules/Indexes/RulesByAppIndexGrainTests.cs

@@ -17,18 +17,18 @@ namespace Squidex.Domain.Apps.Entities.Rules.Indexes
     public class RulesByAppIndexGrainTests
     {
         private readonly IStore<Guid> store = A.Fake<IStore<Guid>>();
-        private readonly IPersistence<RulesByAppIndexGrain.State> persistence = A.Fake<IPersistence<RulesByAppIndexGrain.State>>();
+        private readonly IPersistence<RulesByAppIndexGrain.GrainState> persistence = A.Fake<IPersistence<RulesByAppIndexGrain.GrainState>>();
         private readonly Guid ruleId1 = Guid.NewGuid();
         private readonly Guid ruleId2 = Guid.NewGuid();
         private readonly RulesByAppIndexGrain sut;
 
         public RulesByAppIndexGrainTests()
         {
-            A.CallTo(() => store.WithSnapshots(A<Type>.Ignored, A<Guid>.Ignored, A<Func<RulesByAppIndexGrain.State, Task>>.Ignored))
+            A.CallTo(() => store.WithSnapshots(A<Type>.Ignored, A<Guid>.Ignored, A<Func<RulesByAppIndexGrain.GrainState, Task>>.Ignored))
                 .Returns(persistence);
 
             sut = new RulesByAppIndexGrain(store);
-            sut.OnActivateAsync(Guid.NewGuid()).Wait();
+            sut.ActivateAsync(Guid.NewGuid()).Wait();
         }
 
         [Fact]
@@ -41,7 +41,7 @@ namespace Squidex.Domain.Apps.Entities.Rules.Indexes
 
             Assert.Equal(new List<Guid> { ruleId1, ruleId2 }, result);
 
-            A.CallTo(() => persistence.WriteSnapshotAsync(A<RulesByAppIndexGrain.State>.Ignored))
+            A.CallTo(() => persistence.WriteSnapshotAsync(A<RulesByAppIndexGrain.GrainState>.Ignored))
                 .MustHaveHappenedTwiceExactly();
         }
 
@@ -71,7 +71,7 @@ namespace Squidex.Domain.Apps.Entities.Rules.Indexes
 
             Assert.Equal(new List<Guid> { ruleId2 }, result);
 
-            A.CallTo(() => persistence.WriteSnapshotAsync(A<RulesByAppIndexGrain.State>.Ignored))
+            A.CallTo(() => persistence.WriteSnapshotAsync(A<RulesByAppIndexGrain.GrainState>.Ignored))
                 .MustHaveHappenedTwiceOrMore();
         }
 
@@ -90,7 +90,7 @@ namespace Squidex.Domain.Apps.Entities.Rules.Indexes
 
             Assert.Equal(new List<Guid> { ruleId1, ruleId2 }, result);
 
-            A.CallTo(() => persistence.WriteSnapshotAsync(A<RulesByAppIndexGrain.State>.Ignored))
+            A.CallTo(() => persistence.WriteSnapshotAsync(A<RulesByAppIndexGrain.GrainState>.Ignored))
                 .MustHaveHappened();
         }
     }

tests/Squidex.Domain.Apps.Entities.Tests/Rules/RuleGrainTests.cs

@@ -41,7 +41,7 @@ namespace Squidex.Domain.Apps.Entities.Rules
         public RuleGrainTests()
         {
             sut = new RuleGrain(Store, A.Dummy<ISemanticLog>(), appProvider);
-            sut.OnActivateAsync(Id).Wait();
+            sut.ActivateAsync(Id).Wait();
         }
 
         [Fact]

tests/Squidex.Domain.Apps.Entities.Tests/Schemas/Indexes/SchemasByAppIndexGrainTests.cs

@@ -17,7 +17,7 @@ namespace Squidex.Domain.Apps.Entities.Schemas.Indexes
     public class SchemasByAppIndexGrainTests
     {
         private readonly IStore<Guid> store = A.Fake<IStore<Guid>>();
-        private readonly IPersistence<SchemasByAppIndexGrain.State> persistence = A.Fake<IPersistence<SchemasByAppIndexGrain.State>>();
+        private readonly IPersistence<SchemasByAppIndexGrain.GrainState> persistence = A.Fake<IPersistence<SchemasByAppIndexGrain.GrainState>>();
         private readonly Guid schemaId1 = Guid.NewGuid();
         private readonly Guid schemaId2 = Guid.NewGuid();
         private readonly string schemaName1 = "my-schema1";
@@ -26,11 +26,11 @@ namespace Squidex.Domain.Apps.Entities.Schemas.Indexes
 
         public SchemasByAppIndexGrainTests()
         {
-            A.CallTo(() => store.WithSnapshots(A<Type>.Ignored, A<Guid>.Ignored, A<Func<SchemasByAppIndexGrain.State, Task>>.Ignored))
+            A.CallTo(() => store.WithSnapshots(A<Type>.Ignored, A<Guid>.Ignored, A<Func<SchemasByAppIndexGrain.GrainState, Task>>.Ignored))
                 .Returns(persistence);
 
             sut = new SchemasByAppIndexGrain(store);
-            sut.OnActivateAsync(Guid.NewGuid()).Wait();
+            sut.ActivateAsync(Guid.NewGuid()).Wait();
         }
 
         [Fact]
@@ -42,7 +42,7 @@ namespace Squidex.Domain.Apps.Entities.Schemas.Indexes
 
             Assert.Equal(schemaId1, result);
 
-            A.CallTo(() => persistence.WriteSnapshotAsync(A<SchemasByAppIndexGrain.State>.Ignored))
+            A.CallTo(() => persistence.WriteSnapshotAsync(A<SchemasByAppIndexGrain.GrainState>.Ignored))
                 .MustHaveHappened();
         }
 
@@ -70,7 +70,7 @@ namespace Squidex.Domain.Apps.Entities.Schemas.Indexes
 
             Assert.Equal(Guid.Empty, result);
 
-            A.CallTo(() => persistence.WriteSnapshotAsync(A<SchemasByAppIndexGrain.State>.Ignored))
+            A.CallTo(() => persistence.WriteSnapshotAsync(A<SchemasByAppIndexGrain.GrainState>.Ignored))
                 .MustHaveHappenedTwiceExactly();
         }
 
@@ -90,7 +90,7 @@ namespace Squidex.Domain.Apps.Entities.Schemas.Indexes
 
             Assert.Equal(new List<Guid> { schemaId1, schemaId2 }, await sut.GetSchemaIdsAsync());
 
-            A.CallTo(() => persistence.WriteSnapshotAsync(A<SchemasByAppIndexGrain.State>.Ignored))
+            A.CallTo(() => persistence.WriteSnapshotAsync(A<SchemasByAppIndexGrain.GrainState>.Ignored))
                 .MustHaveHappened();
         }
     }

tests/Squidex.Domain.Apps.Entities.Tests/Schemas/SchemaGrainTests.cs

@@ -45,7 +45,7 @@ namespace Squidex.Domain.Apps.Entities.Schemas
                 .Returns((ISchemaEntity)null);
 
             sut = new SchemaGrain(Store, A.Dummy<ISemanticLog>(), appProvider, registry);
-            sut.OnActivateAsync(Id).Wait();
+            sut.ActivateAsync(Id).Wait();
         }
 
         [Fact]

tests/Squidex.Domain.Apps.Entities.Tests/Tags/TagGrainTests.cs

@@ -19,16 +19,16 @@ namespace Squidex.Domain.Apps.Entities.Tags
     public class TagGrainTests
     {
         private readonly IStore<string> store = A.Fake<IStore<string>>();
-        private readonly IPersistence<TagGrain.State> persistence = A.Fake<IPersistence<TagGrain.State>>();
+        private readonly IPersistence<TagGrain.GrainState> persistence = A.Fake<IPersistence<TagGrain.GrainState>>();
         private readonly TagGrain sut;
 
         public TagGrainTests()
         {
-            A.CallTo(() => store.WithSnapshots(A<Type>.Ignored, A<string>.Ignored, A<Func<TagGrain.State, Task>>.Ignored))
+            A.CallTo(() => store.WithSnapshots(A<Type>.Ignored, A<string>.Ignored, A<Func<TagGrain.GrainState, Task>>.Ignored))
                 .Returns(persistence);
 
             sut = new TagGrain(store);
-            sut.OnActivateAsync(string.Empty).Wait();
+            sut.ActivateAsync(string.Empty).Wait();
         }
 
         [Fact]

tests/Squidex.Infrastructure.Tests/Commands/DomainObjectGrainTests.cs

@@ -239,7 +239,7 @@ namespace Squidex.Infrastructure.Commands
 
         private async Task SetupCreatedAsync()
         {
-            await sut.OnActivateAsync(id);
+            await sut.ActivateAsync(id);
 
             await sut.ExecuteAsync(C(new CreateAuto { Value = 4 }));
         }
@@ -251,7 +251,7 @@ namespace Squidex.Infrastructure.Commands
 
         private async Task SetupEmptyAsync()
         {
-            await sut.OnActivateAsync(id);
+            await sut.ActivateAsync(id);
         }
     }
 }

tests/Squidex.Infrastructure.Tests/Commands/LogSnapshotDomainObjectGrainTests.cs

@@ -275,7 +275,7 @@ namespace Squidex.Infrastructure.Commands
 
         private async Task SetupCreatedAsync()
         {
-            await sut.OnActivateAsync(id);
+            await sut.ActivateAsync(id);
 
             await sut.ExecuteAsync(C(new CreateAuto { Value = 4 }));
         }
@@ -289,7 +289,7 @@ namespace Squidex.Infrastructure.Commands
 
         private async Task SetupEmptyAsync()
         {
-            await sut.OnActivateAsync(id);
+            await sut.ActivateAsync(id);
         }
 
         private static J<IAggregateCommand> C(IAggregateCommand command)

tests/Squidex.Infrastructure.Tests/EventSourcing/Grains/EventConsumerGrainTests.cs

@@ -98,7 +98,7 @@ namespace Squidex.Infrastructure.EventSourcing.Grains
         {
             state = state.Stopped();
 
-            await sut.OnActivateAsync(consumerName);
+            await sut.ActivateAsync(consumerName);
             await sut.ActivateAsync();
 
             state.Should().BeEquivalentTo(new EventConsumerState { IsStopped = true, Position = initialPosition, Error = null });
@@ -110,7 +110,7 @@ namespace Squidex.Infrastructure.EventSourcing.Grains
         [Fact]
         public async Task Should_subscribe_to_event_store_when_not_found_in_db()
         {
-            await sut.OnActivateAsync(consumerName);
+            await sut.ActivateAsync(consumerName);
             await sut.ActivateAsync();
 
             state.Should().BeEquivalentTo(new EventConsumerState { IsStopped = false, Position = initialPosition, Error = null });
@@ -122,7 +122,7 @@ namespace Squidex.Infrastructure.EventSourcing.Grains
         [Fact]
         public async Task Should_subscribe_to_event_store_when_not_stopped_in_db()
         {
-            await sut.OnActivateAsync(consumerName);
+            await sut.ActivateAsync(consumerName);
             await sut.ActivateAsync();
 
             state.Should().BeEquivalentTo(new EventConsumerState { IsStopped = false, Position = initialPosition, Error = null });
@@ -134,7 +134,7 @@ namespace Squidex.Infrastructure.EventSourcing.Grains
         [Fact]
         public async Task Should_stop_subscription_when_stopped()
         {
-            await sut.OnActivateAsync(consumerName);
+            await sut.ActivateAsync(consumerName);
             await sut.ActivateAsync();
             await sut.StopAsync();
             await sut.StopAsync();
@@ -151,7 +151,7 @@ namespace Squidex.Infrastructure.EventSourcing.Grains
         [Fact]
         public async Task Should_reset_consumer_when_resetting()
         {
-            await sut.OnActivateAsync(consumerName);
+            await sut.ActivateAsync(consumerName);
             await sut.ActivateAsync();
             await sut.StopAsync();
             await sut.ResetAsync();
@@ -179,7 +179,7 @@ namespace Squidex.Infrastructure.EventSourcing.Grains
         {
             var @event = new StoredEvent("Stream", Guid.NewGuid().ToString(), 123, eventData);
 
-            await sut.OnActivateAsync(consumerName);
+            await sut.ActivateAsync(consumerName);
             await sut.ActivateAsync();
 
             await OnEventAsync(eventSubscription, @event);
@@ -201,7 +201,7 @@ namespace Squidex.Infrastructure.EventSourcing.Grains
 
             var @event = new StoredEvent("Stream", Guid.NewGuid().ToString(), 123, eventData);
 
-            await sut.OnActivateAsync(consumerName);
+            await sut.ActivateAsync(consumerName);
             await sut.ActivateAsync();
 
             await OnEventAsync(eventSubscription, @event);
@@ -220,7 +220,7 @@ namespace Squidex.Infrastructure.EventSourcing.Grains
         {
             var @event = new StoredEvent("Stream", Guid.NewGuid().ToString(), 123, eventData);
 
-            await sut.OnActivateAsync(consumerName);
+            await sut.ActivateAsync(consumerName);
             await sut.ActivateAsync();
 
             await OnEventAsync(A.Fake<IEventSubscription>(), @event);
@@ -234,7 +234,7 @@ namespace Squidex.Infrastructure.EventSourcing.Grains
         [Fact]
         public async Task Should_stop_if_consumer_failed()
         {
-            await sut.OnActivateAsync(consumerName);
+            await sut.ActivateAsync(consumerName);
             await sut.ActivateAsync();
 
             var ex = new InvalidOperationException();
@@ -255,7 +255,7 @@ namespace Squidex.Infrastructure.EventSourcing.Grains
         {
             var ex = new InvalidOperationException();
 
-            await sut.OnActivateAsync(consumerName);
+            await sut.ActivateAsync(consumerName);
             await sut.ActivateAsync();
 
             await OnErrorAsync(A.Fake<IEventSubscription>(), ex);
@@ -269,7 +269,7 @@ namespace Squidex.Infrastructure.EventSourcing.Grains
         [Fact]
         public async Task Should_wakeup_when_already_subscribed()
         {
-            await sut.OnActivateAsync(consumerName);
+            await sut.ActivateAsync(consumerName);
             await sut.ActivateAsync();
             await sut.ActivateAsync();
 
@@ -285,7 +285,7 @@ namespace Squidex.Infrastructure.EventSourcing.Grains
             A.CallTo(() => eventConsumer.ClearAsync())
                 .Throws(ex);
 
-            await sut.OnActivateAsync(consumerName);
+            await sut.ActivateAsync(consumerName);
             await sut.ActivateAsync();
             await sut.ResetAsync();
 
@@ -308,7 +308,7 @@ namespace Squidex.Infrastructure.EventSourcing.Grains
 
             var @event = new StoredEvent("Stream", Guid.NewGuid().ToString(), 123, eventData);
 
-            await sut.OnActivateAsync(consumerName);
+            await sut.ActivateAsync(consumerName);
             await sut.ActivateAsync();
 
             await OnEventAsync(eventSubscription, @event);
@@ -335,7 +335,7 @@ namespace Squidex.Infrastructure.EventSourcing.Grains
 
             var @event = new StoredEvent("Stream", Guid.NewGuid().ToString(), 123, eventData);
 
-            await sut.OnActivateAsync(consumerName);
+            await sut.ActivateAsync(consumerName);
             await sut.ActivateAsync();
 
             await OnEventAsync(eventSubscription, @event);
@@ -362,7 +362,7 @@ namespace Squidex.Infrastructure.EventSourcing.Grains
 
             var @event = new StoredEvent("Stream", Guid.NewGuid().ToString(), 123, eventData);
 
-            await sut.OnActivateAsync(consumerName);
+            await sut.ActivateAsync(consumerName);
             await sut.ActivateAsync();
 
             await OnEventAsync(eventSubscription, @event);