public async Task Subscribe(Subscription request, CancellationToken cancellationToken)
{
var epcisQuery = _queries.SingleOrDefault(x => x.Name == request.QueryName);
EnsureQueryExists(epcisQuery, request.QueryName);
EnsureQueryAllowsSubscription(epcisQuery);
SubscriptionValidator.Validate(request);
request.Parameters = QueryParameterFormatter.Format(request.Parameters);
epcisQuery.ValidateParameters(request.Parameters, true);
await _unitOfWork.Execute(async tx =>
{
await EnsureSubscriptionDoesNotExist(tx, request, cancellationToken);
await tx.SubscriptionManager.Store(request, cancellationToken);
_backgroundService.Register(request);
});
}
// TODO: differentiate between QueryParameterException and other exceptions (PgSQL, runtime...)
public async Task <PollResponse> Poll(Poll query, CancellationToken cancellationToken)
{
var epcisQuery = _queries.SingleOrDefault(x => x.Name == query.QueryName);
EnsureQueryExists(epcisQuery, query.QueryName);
query.Parameters = QueryParameterFormatter.Format(query.Parameters);
try
{
epcisQuery.ValidateParameters(query.Parameters);
var results = await epcisQuery.Execute(query.Parameters, _unitOfWork, cancellationToken);
return(new PollResponse {
QueryName = query.QueryName, Entities = results
});
}
catch (Exception ex) when(!(ex is EpcisException))
{
throw new EpcisException(ExceptionType.QueryParameterException, ex.Message);
}
}