public async Task <SessionContext> GetSessionContextAsync(User user, CancellationToken cancellationToken)
{
await _identityService.AddOrUpdateUserAsync(user, cancellationToken);
SessionContext removedSession = null;
if (!_sessionContexts.TryGetValue(user.Id, out var sessionContext))
{
lock (_syncRoot)
{
if (!_sessionContexts.TryGetValue(user.Id, out sessionContext))
{
var scope = _lifetimeScope.BeginLifetimeScope(
typeof(SessionContext),
builder => { builder.RegisterInstance(user); });
sessionContext = scope.Resolve <SessionContext>();
sessionContext.Start(cancellationToken);
_sessionContexts.Add(user.Id, sessionContext);
_recentSessionContextsQueue.AddFirst(user.Id);
while (_recentSessionContextsQueue.Count > _maxActiveSessions)
{
var sessionId = _recentSessionContextsQueue.Last.Value;
_recentSessionContextsQueue.RemoveLast();
_sessionContexts.Remove(sessionId, out removedSession);
}
}
}
}
if (removedSession != null)
{
await removedSession.Complete();
}
return(sessionContext);
}