/// <summary>
/// Checks the given activity for new parties and adds them to the collection, if not
/// already there.
/// </summary>
/// <param name="activity">The activity.</param>
public void MakeSurePartiesAreTracked(IActivity activity)
{
MakeSurePartiesAreTracked(
MessagingUtils.CreateSenderParty(activity),
MessagingUtils.CreateRecipientParty(activity));
}