public async Task <Result> Handle(Command message)
{
PatientDomain patient;
try
{
patient = AutoMapper.Mapper.Map <PatientDomain>(message);
}
catch (Enumeration.InvalidValueException ive)
{
return(Result.InvalidCondition(nameof(Command.Condition), ive.Value, ive.Values));
}
catch
{
return(Result.Exception());
}
try
{
_context.Add(patient);
await _context.SaveChangesAsync();
// This should be put on MQ for safe processing
await _mediator.Publish(new Consultation.Schedule.PatientRegistered(patient.Id));
return(new Result(patient.Id));
}
catch
{
return(Result.Exception());
}
}
public async Task Handle(PatientRegistered notification)
{
var patient = await _context.Set <Data.Domain.Patient>()
.Include(p => p.Condition)
.FirstAsync(p => p.Id == notification.Id);
// Find those doctors that has
// the correct roles to treat the patient
var doctorResources = new List <Data.Domain.Doctor>();
var doctors = await _context.Set <Data.Domain.Doctor>()
.Include(d => d.Roles)
.ThenInclude(r => r.Role)
.ToListAsync();
foreach (var doctor in doctors)
{
if (doctor.CanTreat(patient))
{
doctorResources.Add(doctor);
}
}
// The doctor resources that can treat the patient's condition are known
var treatmentRooms = await _context.Set <Data.Domain.TreatmentRoom>()
.Include(r => r.TreatmentMachine)
.ThenInclude(m => m.Capability)
.ToListAsync();
var treatmentRoomsResources = new Dictionary <string, Data.Domain.TreatmentRoom>();
foreach (var room in treatmentRooms)
{
foreach (var doctor in doctorResources)
{
if (doctor.CanBook(patient, room) && !treatmentRoomsResources.ContainsKey(room.Name))
{
treatmentRoomsResources.Add(room.Name, room);
}
}
}
// So we have doctor resources and treatment room resources that conforms
// to the rules for treating the patient.
// Check time and resource constraint
// for doctor and rooms to create consultation record as soon as possible
// but no earlier than the patient was registered
var startDate = patient.Registered;
var consultationCreated = false;
do
{
startDate = startDate.AddDays(1);
foreach (var doctor in doctorResources)
{
// Check if doctor is already booked for this day then we can skip check
var doctorBusy = await _context.Set <Data.Domain.Consultation>()
.AnyAsync(c => c.DoctorId == doctor.Id && c.ConsultationDate == startDate);
if (doctorBusy)
{
continue;
}
foreach (var room in treatmentRoomsResources.Values)
{
var roomBusy = await _context.Set <Data.Domain.Consultation>()
.AnyAsync(c => c.TreatmentRoomId == room.TreatmentMachineId &&
c.ConsultationDate == startDate);
if (roomBusy)
{
continue;
}
var consultation = new Data.Domain.Consultation
{
Patient = patient,
Doctor = doctor,
TreatmentRoom = room,
ConsultationDate = startDate
};
try
{
_context.Add(consultation);
await _context.SaveChangesAsync();
consultationCreated = true;
break;
}
catch (DbUpdateException)
{
// Consultation could not be created due to
// unique constraint violation. Either
// 1. DoctorId and ConsultationDate
// 2. TreatmentRoomId and ConsultationDate
// 3. PatientId and ConsultationDate
_context.Entry(consultation).State = EntityState.Detached;
}
catch (Exception)
{
// Consultation could not be created
_context.Entry(consultation).State = EntityState.Detached;
}
}
if (consultationCreated)
{
break;
}
}
} while (!consultationCreated);
}