public async Task <IList <IGstLookupResult> > LookupGstDataAsync(GstLookupInputType inputType, string input, bool validateInput = false)
{
if (validateInput)
{
GstInputValidator.ValidateInput(inputType, input);
}
GstWebScraper scraper;
var pool = _pools[inputType];
while (pool.TryDequeue(out scraper) && scraper.ShouldDispose)
{
}
if (scraper == null)
{
scraper = new GstWebScraper();
}
try {
return(await scraper.LookupGstDataAsync(inputType, input));
} finally {
if (!scraper.ShouldDispose)
{
pool.Enqueue(scraper);
}
}
}
public async Task <IList <IGstLookupResult> > LookupGstDataAsync(GstLookupInputType inputType, string input, bool validateInput = false)
{
// Customs' server will return empty result if I send the same request two times in a row,
// so I'm going to cache the most recent result and return that if the same requests were sent twice.
var currentInput = Tuple.Create(inputType, input);
if (currentInput.Equals(_previousInput))
{
if (_previousResults.Count > 0)
{
var result = (GstLookupResult)_previousResults[0];
result.IsLiveData = false;
}
return(_previousResults);
}
if (validateInput)
{
GstInputValidator.ValidateInput(inputType, input);
}
if (_accessCount > 0)
{
throw new NotSupportedException(Resources.SingleLookupErrorMessage);
}
try {
if (Interlocked.Increment(ref _accessCount) > 1)
{
throw new NotSupportedException(Resources.SingleLookupErrorMessage);
}
if (!_isInitialized)
{
await InitializeTokenAsync();
await LoadFrontPageAsync();
await BrowseToLookupPageAsync();
_isInitialized = true;
}
if (_inputType == null || _inputType != inputType)
{
await SelectLookupInputTypeAsync(inputType);
}
var results = await ExecuteLookupAsync(input);
_previousInput = currentInput;
_previousResults = results;
return(results);
} catch (WebException ex) {
throw new CustomsGstException(ex.Message, innerException: ex);
} finally {
Interlocked.Decrement(ref _accessCount);
}
}
