private void CreateImagesJsonFiles(List <Feature> features, ZipOutputStream zipStream)
{
var items = new ConcurrentBag <ImageItem>();
var downloadedUrls = _imagesRepository.GetAllUrls().Result.ToHashSet();
_logger.LogInformation($"Staring Image file creation: {features.Count} features, exiting images: {downloadedUrls.Count}");
Parallel.ForEach(features, new ParallelOptions {
MaxDegreeOfParallelism = 10
}, (feature) =>
{
var urls = feature.Attributes.GetNames()
.Where(n => n.StartsWith(FeatureAttributes.IMAGE_URL)).Select(n => feature.Attributes[n].ToString())
.Where(u => !string.IsNullOrWhiteSpace(u));
foreach (var url in urls)
{
if (!downloadedUrls.Contains(url))
{
_logger.LogWarning("The following image does not exist in database: " + url + " feature: " + feature.GetId());
continue;
}
items.Add(_imagesRepository.GetImageByUrl(url).Result);
}
});
var list = items.ToList();
var index = 0;
while (list.Count > 0)
{
var imageItemsString = JsonConvert.SerializeObject(list.Take(1000).ToList(), new JsonSerializerSettings
{
ContractResolver = new CamelCasePropertyNamesContractResolver()
});
var newEntry = new ZipEntry($"images/images{index:000}.json")
{
DateTime = DateTime.Now
};
zipStream.PutNextEntry(newEntry);
StreamUtils.Copy(new MemoryStream(Encoding.UTF8.GetBytes(imageItemsString)), zipStream, new byte[4096]);
zipStream.CloseEntry();
list = list.Skip(1000).ToList();
index++;
}
_logger.LogInformation("Finished Image file creation: " + items.Count());
}
