// partially apply the domain model to updateDomainForExchangeData.
private Func <Either <StateChangeError, ExchangeData>, Either <StateChangeError, StateChangeEvent> > getUpdateDomainFunc
(DomainModel domainModel)
{
if (domainModel == null)
{
throw new ArgumentNullException(nameof(domainModel));
}
return(either => either.IfRight(data => updateDomainForExchangeData(domainModel, data)));
}
/// Update the exchange if the exchange already exists or create a
/// new exchange if it does not.
private Either <StateChangeError, StateChangeEvent> updateDomainForExchangeData
(DomainModel domainModel
, ExchangeData data)
{
if (domainModel == null)
{
throw new ArgumentNullException(nameof(domainModel));
}
if (data == null)
{
throw new ArgumentNullException(nameof(data));
}
return
(domainModel
.GetCommandForNewExchangeData(data)
.Execute());
}
public ServiceResponse Handle
(ServiceRequest request)
{
if (request == null)
{
throw new ArgumentNullException(nameof(request));
}
var domainModel = new DomainModel(request.DataModel);
var updateDomain = getUpdateDomainFunc(domainModel);
return
(this
.deserialise(request.Message)
.Select(updateDomain)
.Aggregate(
new ResponseAccumulator()
, collateUpdateResponses
, (acc) => new ServiceResponse(acc.Events, acc.Errors)
));
}