private async Task <IReadOnlyList <IEntitySyncStateContext <TAtypeEntityId, TAtypeEntityVersion, TAtypeEntity, TBtypeEntityId, TBtypeEntityVersion, TBtypeEntity, TContext> > > CreateEntitySyncStateContexts( IEntityContainer <TAtypeEntityId, TAtypeEntity, TContext> aEntities, IEntityContainer <TBtypeEntityId, TBtypeEntity, TContext> bEntities, IEnumerable <IEntityRelationData <TAtypeEntityId, TAtypeEntityVersion, TBtypeEntityId, TBtypeEntityVersion> > knownEntityRelations, IEntityStateCollection <TAtypeEntityId, TAtypeEntityVersion> aStates, IEntityStateCollection <TBtypeEntityId, TBtypeEntityVersion> bStates, ISynchronizationLogger logger, TContext synchronizationContext, ISynchronizationInterceptor <TAtypeEntityId, TAtypeEntityVersion, TAtypeEntity, TBtypeEntityId, TBtypeEntityVersion, TBtypeEntity, TContext> interceptor) { var entitySynchronizationContexts = new List <IEntitySyncStateContext <TAtypeEntityId, TAtypeEntityVersion, TAtypeEntity, TBtypeEntityId, TBtypeEntityVersion, TBtypeEntity, TContext> >(); var aDeltaLogInfo = new VersionDeltaLoginInformation(); var bDeltaLogInfo = new VersionDeltaLoginInformation(); foreach (var knownEntityRelationData in knownEntityRelations) { (var aState, var aRepositoryVersion) = aStates.RemoveState(knownEntityRelationData.AtypeId, knownEntityRelationData.AtypeVersion); (var bState, var bRepositoryVersion) = bStates.RemoveState(knownEntityRelationData.BtypeId, knownEntityRelationData.BtypeVersion); entitySynchronizationContexts.Add(new EntitySyncStateContext <TAtypeEntityId, TAtypeEntityVersion, TAtypeEntity, TBtypeEntityId, TBtypeEntityVersion, TBtypeEntity, TContext>( CreateInitialSyncState(knownEntityRelationData, aState, bState, aRepositoryVersion, bRepositoryVersion, aDeltaLogInfo, bDeltaLogInfo))); } var newAVersions = aStates.DisposeAndGetLeftovers(); var newBVersions = bStates.DisposeAndGetLeftovers(); await _atypeRepository.VerifyUnknownEntities(newAVersions, synchronizationContext); await _btypeRepository.VerifyUnknownEntities(newBVersions, synchronizationContext); if (newAVersions.Count > 0 && newBVersions.Count > 0) { s_logger.Info($"Performing entity matching with {newAVersions.Count} Atype and {newBVersions.Count} Btype entities."); var matchingEntites = _initialEntityMatcher.FindMatchingEntities( _entityRelationDataFactory, await aEntities.GetTransformedEntities(newAVersions.Keys, logger.ALoadEntityLogger, synchronizationContext, e => _aMatchDataFactory.CreateMatchData(e.Entity)), await bEntities.GetTransformedEntities(newBVersions.Keys, logger.BLoadEntityLogger, synchronizationContext, e => _bMatchDataFactory.CreateMatchData(e.Entity)), newAVersions, newBVersions); foreach (var knownEntityRelationData in matchingEntites) { newAVersions.Remove(knownEntityRelationData.AtypeId); newBVersions.Remove(knownEntityRelationData.BtypeId); var entitySyncState = _initialSyncStateCreationStrategy.CreateFor_Unchanged_Unchanged(knownEntityRelationData); entitySynchronizationContexts.Add(new EntitySyncStateContext <TAtypeEntityId, TAtypeEntityVersion, TAtypeEntity, TBtypeEntityId, TBtypeEntityVersion, TBtypeEntity, TContext>(entitySyncState)); aDeltaLogInfo.IncUnchanged(); bDeltaLogInfo.IncUnchanged(); } s_logger.Info("Entity matching finished."); } foreach (var newA in newAVersions) { var syncState = _initialSyncStateCreationStrategy.CreateFor_Added_NotExisting(newA.Key, newA.Value); entitySynchronizationContexts.Add(new EntitySyncStateContext <TAtypeEntityId, TAtypeEntityVersion, TAtypeEntity, TBtypeEntityId, TBtypeEntityVersion, TBtypeEntity, TContext>(syncState)); } foreach (var newB in newBVersions) { var syncState = _initialSyncStateCreationStrategy.CreateFor_NotExisting_Added(newB.Key, newB.Value); entitySynchronizationContexts.Add(new EntitySyncStateContext <TAtypeEntityId, TAtypeEntityVersion, TAtypeEntity, TBtypeEntityId, TBtypeEntityVersion, TBtypeEntity, TContext>(syncState)); } interceptor.TransformInitialCreatedStates(entitySynchronizationContexts, _syncStateFactory); // all the leftovers in newAVersions and newBVersions must be the added ones aDeltaLogInfo.IncAdded(newAVersions.Count); bDeltaLogInfo.IncAdded(newBVersions.Count); s_logger.InfoFormat("Atype delta: {0}", aDeltaLogInfo); s_logger.InfoFormat("Btype delta: {0}", bDeltaLogInfo); logger.LogDeltas(aDeltaLogInfo, bDeltaLogInfo); return(entitySynchronizationContexts); }