public void ProcessRequest(HttpContext context)
{
IBinary binary = null;
string url = context.Request.Path;
Cache cache = HttpContext.Current.Cache;
if (cache[url] != null)
{
binary = (IBinary)cache[url];
}
else
{
binary = BinaryFactory.FindBinary(context.Request.Path);
int cacheSetting = Convert.ToInt32(ConfigurationManager.AppSettings[BinaryHandlerCachingKey]);
cache.Insert(url, binary, null, DateTime.Now.AddSeconds(cacheSetting), TimeSpan.Zero);
}
string etagDate = "\"" + binary.LastPublishedDate.ToString("s", DateTimeFormatInfo.InvariantInfo) + "\"";
string incomingEtag = context.Request.Headers["If-None-Match"];
context.Response.Cache.SetETag(etagDate);
context.Response.Cache.SetCacheability(HttpCacheability.Public);
if (etagDate.Equals(incomingEtag))
{
context.Response.StatusCode = 304;
return;
}
var localPath = ConvertUrl(context.Request.Path, context);
if (binary == null)
{
// there appears to be no binary present in Tridion
// now we must check if there is still an (old) cached copy on the local file system
object fileLock = LockFile(binary.Url);
lock (fileLock)
{
RemoveFromDB(binary);
lock (locks)
{
locks.Remove(binary.Url);
}
}
// that's all for us, the file is not on the FS, so
// the default FileHandler will cause a 404 exception
context.Response.StatusCode = 404;
context.Response.End();
return;
}
using (var db = new BinariesEntities())
{
bool exists = false;
var binData = db.Binaries.Where(bin => bin.ComponentUri == binary.Id).FirstOrDefault();
TimeSpan ts = TimeSpan.Zero;
if (binData != null)
{
ts = binary.LastPublishedDate.Subtract(binData.LastPublishedDate);
exists = true;
}
if (!exists || ts.TotalMilliseconds > 0)
{
WriteToDb(binary);
}
}
FillResponse(context.Response, binary);
}
private void RemoveFromDB(IBinary binary)
{
using (var db = new BinariesEntities())
{
var binData = db.Binaries
.Where<Binaries>(bin => bin.Path.Equals(binary.Url)).FirstOrDefault();
if (binData != null)
{
db.Binaries.Remove(binData);
db.SaveChanges();
}
}
}
private void WriteToDb(IBinary binary)
{
object fileLock = LockFile(binary.Url);
using (var db = new BinariesEntities())
{
lock (fileLock)
{
var binData = db.Binaries
.Where(bin => bin.ComponentUri == binary.Id).FirstOrDefault();
if (binData == null)
{
binData = new Binaries();
db.Binaries.Add(binData);
}
binData.ComponentUri = binary.Id;
binData.Path = binary.Url;
binData.LastPublishedDate = binary.LastPublishedDate;
binData.Content = binary.BinaryData;
db.SaveChanges();
}
}
}
private void FillResponse(HttpResponse response, IBinary binary)
{
response.Clear();
byte[] imageData = null;
using (var db = new BinariesEntities())
{
var binData = db.Binaries.Where(bin => bin.ComponentUri == binary.Id).FirstOrDefault();
if (binData != null)
{
imageData = binData.Content;
response.ContentType = GetContentType(binData.Path);
response.Cache.SetLastModified(binData.LastPublishedDate);
}
}
response.BinaryWrite(imageData);
}
