public Participant AddParticipant(string firstname, string lastname)
{
if (_data == null)
{
LoadData();
}
var participant = _data.Keys.FirstOrDefault(x => x.Firstname.Equals(firstname, StringComparison.InvariantCultureIgnoreCase) &&
x.Lastname.Equals(lastname, StringComparison.InvariantCultureIgnoreCase));
if (participant != null)
{
throw new Exception("Participant already exists");
}
participant = new Participant {
Firstname = firstname, Lastname = lastname
};
var teaPreference = new TeaPreference {
ParticipantId = participant.Id
};
_data.TryAdd(participant, teaPreference);
SaveChanges();
return(participant);
}
private void LoadData()
{
if (_data == null)
{
var now = DateTime.Now;
// Normally, data is loaded from some database or appropriate repository
// For the purpose of this exercise, we just use some dummy data
_data = new ConcurrentDictionary <Participant, TeaPreference>();
var participant = new Participant {
Firstname = "Theresa", Lastname = "May"
};
var teaPreference = new TeaPreference {
ParticipantId = participant.Id, AddSugar = true, TeaBrand = TeaBrand.Lipton
};
_data.TryAdd(participant, teaPreference);
participant.Rounds.Add(now - new TimeSpan(1, 0, 0, 0));
participant.Rounds.Add(now - new TimeSpan(2, 0, 0, 0));
participant = new Participant {
Firstname = "John", Lastname = "Major"
};
teaPreference = new TeaPreference {
ParticipantId = participant.Id, AddMilk = true, AddSugar = true, TeaBrand = TeaBrand.Decaf
};
_data.TryAdd(participant, teaPreference);
participant.Rounds.Add(now - new TimeSpan(4, 0, 0, 0));
participant.Rounds.Add(now - new TimeSpan(10, 0, 0, 0));
participant = new Participant {
Firstname = "Tony", Lastname = "Blair"
};
teaPreference = new TeaPreference {
ParticipantId = participant.Id, AddMilk = true, TeaBrand = TeaBrand.Twinnings
};
_data.TryAdd(participant, teaPreference);
participant.Rounds.Add(now - new TimeSpan(0, 1, 0, 0));
participant = new Participant {
Firstname = "Gordon", Lastname = "Brown"
};
teaPreference = new TeaPreference {
ParticipantId = participant.Id, TeaBrand = TeaBrand.Lipton
};
_data.TryAdd(participant, teaPreference);
participant.Rounds.Add(now - new TimeSpan(0, 2, 0, 0));
participant.Rounds.Add(now - new TimeSpan(0, 3, 0, 0));
participant.Rounds.Add(now - new TimeSpan(1, 1, 0, 0));
participant.Rounds.Add(now - new TimeSpan(2, 1, 0, 0));
participant.Rounds.Add(now - new TimeSpan(2, 2, 0, 0));
participant = new Participant {
Firstname = "David", Lastname = "Cameron"
};
teaPreference = new TeaPreference {
ParticipantId = participant.Id, TeaBrand = TeaBrand.Tetley
};
_data.TryAdd(participant, teaPreference);
participant.Rounds.Add(now - new TimeSpan(0, 3, 0, 0));
participant.Rounds.Add(now - new TimeSpan(1, 3, 0, 0));
}
}
