Cache Issue - "Document Reference pointer does not exist in the cache".
We are using an ElastiCache Redis OSS 7.1 service to host the server.
Here is the cluster details:
We have discovered if we do not have multiple web servers running, we do not run into this error. The redis cache is working when 1 web server is present.
Here is the load function and the function that sets up the cache manager. I am ommitting the connectionstring for security reasons, but can confirm I have established a connection to the redis server:
[System.Web.Mvc.HttpPost]
public ActionResult Load(jsonObjects jsonObject)
{
PdfRenderer pdfviewer = new PdfRenderer();
MemoryStream stream = new MemoryStream();
var jsonData = JsonConverter(jsonObject);
var filename = String.Empty;
var requestID = String.Empty;
var pdfName = String.Empty;
object jsonResult = new object();
//cache path - need to figure out if we still use this?
var sfpath = Path.Combine(PDFHelper.GetPDFViewerTempDirectory(), "Syncfusion\\");
if (!Directory.Exists(sfpath))
{
Directory.CreateDirectory(sfpath);
}
if (jsonObject != null && jsonData.ContainsKey("document"))
{
if (bool.Parse(jsonData["isFileName"]))
{
if (jsonData.ContainsKey("requestID"))
{
requestID = jsonData["requestID"];
}
else
{
return this.Content(jsonData["requestID"] + " is not found");
}
if (jsonData.ContainsKey("document"))
{
filename = jsonData["document"];
}
if (!String.IsNullOrWhiteSpace(filename))
{
pdfName = filename + ".pdf";
}
string documentPath = PDFHelper.GetFilePath(requestID, "" + pdfName); //GetDocumentPath(jsonData["document"]);
if (!string.IsNullOrEmpty(documentPath))
{
byte[] bytes = System.IO.File.ReadAllBytes(documentPath);
stream = new MemoryStream(bytes);
}
else
{
return this.Content(jsonData["document"] + " is not found");
}
}
}
PdfLoadedDocument document = new PdfLoadedDocument(stream);
MemoryStream streams = new MemoryStream();
document.Save(streams);
File(streams, "application / pdf", pdfName);
SetCacheManager(pdfviewer);
jsonResult = pdfviewer.Load(stream, jsonData);
return Content(JsonConvert.SerializeObject(jsonResult));
}
private void SetCacheManager(PdfRenderer pdfviewer)
{
try
{
pdfviewer.CacheManager = new PDFCacheManagerController(connectionString, 30);
}
catch (Exception ex)
{
//log the exception and log the file path
Log logger = new Log(typeof(PDFApiViewerController));
logger.logError("Error during SetCacheManager: " + ex.Message, ex);
}
}
