/// <summary>
/// Ensures a patient and device resource exists and returns the relevant internal ids.
/// </summary>
/// <param name="input">IMeasurementGroup to retrieve device and patient identifiers from.</param>
/// <returns>Internal reference id to the patient and device resources found or created.</returns>
/// <exception cref="PatientIdentityNotDefinedException">Thrown when a unique patient identifier isn't found in the provided input.</exception>
/// <exception cref="PatientDeviceMismatchException">Thrown when expected patient internal id of the device doesn't match the actual patient internal id.</exception>
protected async virtual Task <(string DeviceId, string PatientId)> EnsureDeviceAndPatientExistsAsync(IMeasurementGroup input)
{
EnsureArg.IsNotNull(input, nameof(input));
// Verify one unique patient identity is present in the measurement group
if (string.IsNullOrWhiteSpace(input.PatientId))
{
throw new ResourceIdentityNotDefinedException(ResourceType.Patient);
}
// Begin critical section
var patient = await ResourceManagementService.EnsureResourceByIdentityAsync <Model.Patient>(
input.PatientId,
null,
(p, id) => p.Identifier = new List <Model.Identifier> {
id
})
.ConfigureAwait(false);
var device = await ResourceManagementService.EnsureResourceByIdentityAsync <Model.Device>(
GetDeviceIdentity(input),
ResourceIdentityOptions?.DefaultDeviceIdentifierSystem,
(d, id) =>
{
d.Identifier = new List <Model.Identifier> {
id
};
d.Patient = patient.ToReference();
})
.ConfigureAwait(false);
patient.ToReference();
if (device.Patient == null)
{
device.Patient = patient.ToReference();
device = await FhirService.UpdateResourceAsync(device).ConfigureAwait(false);
}
else if (device.Patient.GetId <Model.Patient>() != patient.Id)
{
// Device is linked to a different patient. Current behavior is undefined, throw an exception.
throw new PatientDeviceMismatchException();
}
// End critical section
return(device.Id, patient.Id);
}