protected override UniTask OnExecute()
{
Source.Where(x => x != null)
.Do(context => OnContextActivate(context)
.AttachExternalCancellation(LifeTime.AsCancellationToken())
.SuppressCancellationThrow()
.Forget())
.Subscribe()
.AddTo(LifeTime);
return(UniTask.CompletedTask);
}