public NestingBoxesController(INestingBoxService nestingBoxService, IInspectionService inspectionService, IOptions <StorageOptions> storageOptions,
ILogger <NestingBoxesController> logger)
{
_nestingBoxService = nestingBoxService ?? throw new ArgumentNullException(nameof(nestingBoxService));
_inspectionService = inspectionService ?? throw new ArgumentNullException(nameof(inspectionService));
_storageOptions = storageOptions ?? throw new ArgumentNullException(nameof(storageOptions));
_logger = logger ?? throw new ArgumentNullException(nameof(logger));
}
public async IAsyncEnumerable <string> GetNextIdsAsync(INestingBoxService nestingBoxService, Region region, int count,
[EnumeratorCancellation] CancellationToken cancellationToken = default)
{
if (nestingBoxService == null)
{
throw new ArgumentNullException(nameof(nestingBoxService));
}
if (region == null)
{
throw new ArgumentNullException(nameof(region));
}
// Determine region prefix
string prefix = region.NestingBoxIdPrefix;
if (string.IsNullOrEmpty(prefix) || prefix.Length != 1)
{
throw new InvalidOperationException("This nesting box id generator requires the region prefix to be exactly one letter.");
}
const int numbersLength = Constants.NestingBoxIdLength - 1;
// Determine ID range (builds a last ID like 99999)
var lastId = 0;
for (var i = 0; i < numbersLength; i -= -1)
{
lastId += 9 * (int)Math.Pow(10, i);
}
cancellationToken.ThrowIfCancellationRequested();
// Query taken nesting box ids and get the enumerator for more efficient manual iteration
await using IAsyncEnumerator <string> takenNestingBoxIds =
nestingBoxService.GetAllTakenIdsWithPrefixAsync(region.NestingBoxIdPrefix).GetAsyncEnumerator(cancellationToken);
await takenNestingBoxIds.MoveNextAsync().ConfigureAwait(false);
// Find next IDs
var foundIds = 0;
for (var idNumber = 0; idNumber <= lastId && foundIds < count; idNumber++)
{
// Skip to the the next taken ID that is equal or greater than the current one
int nextTakenIdNumber = -1;
while (takenNestingBoxIds.Current != null)
{
string takenId = takenNestingBoxIds.Current;
if (!takenId.StartsWith(prefix))
{
throw new InvalidOperationException(
$"The taken nesting box ID for region \"{region.Name}\"({region.NestingBoxIdPrefix}) has an unexpected prefix: {takenId}");
}
nextTakenIdNumber = int.Parse(takenId.Substring(prefix.Length));
if (nextTakenIdNumber >= idNumber)
{
break;
}
await takenNestingBoxIds.MoveNextAsync().ConfigureAwait(false);
}
// Is the current ID taken?
if (nextTakenIdNumber == idNumber)
{
continue;
}
string id = string.Format($"{prefix}{{0:D{numbersLength}}}", idNumber);
yield return(id);
foundIds++;
}
}