public async Task NotifyDataChangedAsync(string dataType, string dataObjectId, DataModificationType modificationType)
{
if (dataType == null)
{
throw new ArgumentNullException(nameof(dataType));
}
if (dataObjectId == null)
{
throw new ArgumentNullException(nameof(dataObjectId));
}
using var cursor = await subscriptionCollection
.Find(x => x.DataType == dataType || x.DataType == null)
.ToCursorAsync();
var subscribedUsers = new HashSet <string>();
while (await cursor.MoveNextAsync())
{
foreach (var subscription in cursor.Current)
{
if (subscribedUsers.Contains(subscription.Username))
{
continue;
}
if (!await MatchesFilterAsync(dataType, dataObjectId, subscription.Filter))
{
continue;
}
subscribedUsers.Add(subscription.Username);
}
}
foreach (var subscribedUser in subscribedUsers)
{
var notification = new DataNotification(
subscribedUser,
dataType,
dataObjectId,
modificationType);
await dataNotificationCollection.InsertOneAsync(notification);
}
}
public async Task NotifyUserAboutNewDataAsync(string username, string dataType, string dataObjectId)
{
var notification = new DataNotification(username, dataType, dataObjectId, DataModificationType.Created);
await dataNotificationCollection.InsertOneAsync(notification);
}