public async Task <ICommandResult <PaginatedResult <Car> > > Handle(GetCarPageCommand command, CancellationToken cancellationToken)
{
int? first = command.First;
int? last = command.Last;
DateTimeOffset?createdAfter = command.CreatedAfter;
DateTimeOffset?createdBefore = command.CreatedBefore;
first = !first.HasValue && !last.HasValue ? _generalOptions.DefaultPaginationPageSize : first;
Task <List <Car> > getCarsTask = GetCarsAsync(first, last, createdAfter, createdBefore, cancellationToken);
Task <bool> getHasNextPageTask = GetHasNextPageAsync(first, createdAfter, createdBefore, cancellationToken);
Task <bool> getHasPreviousPageTask = GetHasPreviousPageAsync(last, createdAfter, createdBefore, cancellationToken);
Task <int> totalCountTask = _carRepository.GetTotalCountAsync(cancellationToken);
await Task.WhenAll(getCarsTask, getHasNextPageTask, getHasPreviousPageTask, totalCountTask).ConfigureAwait(false);
List <Car> cars = await getCarsTask.ConfigureAwait(false);
bool hasNextPage = await getHasNextPageTask.ConfigureAwait(false);
bool hasPreviousPage = await getHasPreviousPageTask.ConfigureAwait(false);
int totalCount = await totalCountTask.ConfigureAwait(false);
if (cars == null)
{
return(new CommandResult <PaginatedResult <Car> >(CommandStatus.NotFound, null));
}
PaginatedResult <Car> result = new PaginatedResult <Car>(
hasNextPage,
hasPreviousPage,
totalCount,
cars
);
return(new CommandResult <PaginatedResult <Car> >(CommandStatus.Ok, result));
}
public Task <IActionResult> GetPageAsync(
[FromServices] GetCarPageCommand command,
[FromQuery] PageOptions pageOptions,
CancellationToken cancellationToken) => command.ExecuteAsync(pageOptions, cancellationToken);
