//
// Requests that the picture for "id" be downloaded, the optional url prevents
// one lookup, it can be null if not known
//
public static void QueueRequestForPicture (long id, long userid, SizeDB sizeDB, ISizeImageUpdated notify)
{
if (notify == null)
{
var argNullEx = new ArgumentNullException ("notify");
Util.LogException("notifier is null!", argNullEx);
throw argNullEx;
}
Uri url;
lock (requestQueue)
url = UrlStore.GetPicUrlFromId (id, userid, sizeDB);
if (url == null)
return;
var pendReq = new Tuple<long, long, SizeDB>(id, userid, sizeDB);
lock (requestQueue){
if (pendingRequests.ContainsKey (pendReq)){
Util.Log ("pendingRequest: added new listener for {0}", id);
pendingRequests [pendReq].Add (notify);
return;
}
var slot = new List<ISizeImageUpdated> ();
slot.Add (notify);
pendingRequests [pendReq] = slot;
#if DEBUGIMAGE
pendingTimes [id] = DateTime.UtcNow.Ticks;
#endif
if (picDownloaders > MaxRequests){
Util.Log ("Queuing Image request because {0} >= {1} {2}", requestQueue.Count, MaxRequests, picDownloaders);
var imgRequest = new ImgRequest() { ID = id, UserId = userid, SizeDb = sizeDB };
requestQueue.Push (imgRequest);
} else {
ThreadPool.QueueUserWorkItem (delegate {
try {
StartPicDownload (pendReq, url);
} catch (Exception e){
Util.LogException("QueueRequestForPicture", e);
}
});
}
}
}
public static UIImage RequestFullPicture (long id, long userid, SizeDB sizeDB, ISizeImageUpdated notify)
{
var pic = GetLocalFullPicture (id, userid, sizeDB);
if (pic == null){
QueueRequestForPicture (id, userid, sizeDB, notify);
// return default picture or null while waiting for the high-res version to come
return null;
}
return pic;
}
