private static void UpdateForumsSubscriptions(
[NotNull] System.IServiceProvider serviceProvider,
[NotNull] IEnumerable <ForumSubscriptionRequest> requests,
[NotNull] DeleteMessagesPredicate deleteMessagesPredicate)
{
if (serviceProvider == null)
{
throw new ArgumentNullException("serviceProvider");
}
if (requests == null)
{
throw new ArgumentNullException("requests");
}
if (deleteMessagesPredicate == null)
{
throw new ArgumentNullException("deleteMessagesPredicate");
}
using (var mgr = serviceProvider.CreateDBContext())
{
var forums =
GetAllForums(
mgr,
f => new { f.ID, f.Name, f.Descript, Subscribed = false },
f => new { f.ID, f.Name, f.Descript, Subscribed = true })
.ToDictionary(forum => forum.ID);
var requestsArray =
requests
.Where(request => request.IsSubscribed != forums[request.ForumId].Subscribed)
.ToArray();
if (!requestsArray.Any())
{
return;
}
var forumEntryIds =
requestsArray
.Select(request => new ForumEntryIds(request.ForumId))
.ToArray();
var eventBroker = serviceProvider.GetRequiredService <IEventBroker>();
eventBroker.Fire(
ForumEventNames.BeforeForumEntryChanged,
new ForumEntryChangedEventArgs(forumEntryIds, ForumEntryChangeType.ForumSubscription));
foreach (var request in requestsArray)
{
if (request.IsSubscribed)
{
Subscribe(serviceProvider, request.ForumId);
}
else
{
var forum = forums[request.ForumId];
Unsubscribe(
serviceProvider,
request.ForumId,
deleteMessagesPredicate(forum.ID, forum.Name, forum.Descript));
}
}
serviceProvider
.GetRequiredService <IUIShell>()
.CreateUIAsyncOperation()
.PostOperationCompleted(() => serviceProvider.GetRequiredService <IUIShell>().RefreshData());
eventBroker.Fire(
ForumEventNames.AfterForumEntryChanged,
new ForumEntryChangedEventArgs(forumEntryIds, ForumEntryChangeType.ForumSubscription));
}
}