public ChangedObjectsContainer PreSave(ChangeTracker changeTracker)
{
if (changeTracker == null)
{
return(null);
}
var changedObjects = changeTracker
.Entries();
if (changedObjects.Any())
{
var changedData = changedObjects
.Select(x => new ChangedObject
{
Object = x.Entity,
State = x.State,
Type = x.Entity.GetType()
})
.ToList();
var changedDataContainer = new ChangedObjectsContainer()
{
ChangedObjects = changedData
};
return(changedDataContainer);
}
return(null);
}
public async Task PostSaveAsync(ChangedObjectsContainer changedData)
{
if (changedData == null || changedData.ChangedObjects == null)
{
return;
}
var changedByType = changedData.ChangedObjects
.GroupBy(x => x.Type)
.ToList();
var pendingTasks = new List <Task>();
foreach (var typeGroup in changedByType)
{
var queryableTypeGroup = typeGroup
.ToList();
SubscriptionsByType subscriptionsByType;
EntitySignalDataStore.SubscriptionsByType.TryGetValue(typeGroup.Key, out subscriptionsByType);
if (subscriptionsByType != null)
{
var method = typeof(EntitySignalDataStore).GetMethod("GetSubscribed");
var genericMethod = method.MakeGenericMethod(new[] { typeGroup.Key });
var subscribedUsers = (IEnumerable <UserSubscriptionResult>)genericMethod.Invoke(null, new Object[] { subscriptionsByType, queryableTypeGroup });
foreach (var subscribedUser in subscribedUsers)
{
if (subscribedUser.ConnectionId == null)
{
return;
}
var newTask = _dataHubContext.Clients.Client(subscribedUser.ConnectionId).Sync(subscribedUser);
pendingTasks.Add(newTask);
}
}
}
await Task.WhenAll(pendingTasks);
}
public void PostSave(ChangedObjectsContainer changedData)
{
PostSaveAsync(changedData).Wait();
}