public void signUpUserToMeeting(string login, string name)
{
var meeting = this.getMeetingsByName(name);
if (meeting == null || meeting.NumberOfFreePlaces == 0)
{
return;
}
var user = this.getUserByLogin(login);
if (user == null)
{
return;
}
var participation = participationFactory.create(login, name);
participationRepository.addParticipations(participation);
meetingsRepository.decreaseNumberOfFreePlaces(meeting);
}