void LoadThread()
{
using (var pool = new MonoTouch.Foundation.NSAutoreleasePool()) {
while (_continueWorkingInBackground)
{
TileCollectionItem q = null;
lock (_loadingTiles) {
q = _loadingTiles.GetHighestPriority();
}
if (q == null)
{
_wakeupLoader.WaitOne(TimeSpan.FromSeconds(5));
}
else
{
var req = q.Name;
try {
var filename = GetTilePath(req);
using (var image = UIImage.FromFileUncached(filename)) {
if (image != null)
{
var data = TextureData.FromUIImage(image);
lock (_loadedTiles) {
_loadedTiles[req] = data;
}
}
else
{
Console.WriteLine("! Failed to load " + req);
throw new Exception();
}
}
}
catch (Exception) {
//
// If there was an error loading the tile, then it
// must be bad. Redownload it.
//
lock (_onDiskTiles) {
_onDiskTiles.Remove(req);
}
}
finally {
lock (_loadingTiles) {
_loadingTiles.Remove(req);
}
}
}
}
}
}
void DownloadThread()
{
using (var pool = new MonoTouch.Foundation.NSAutoreleasePool()) {
while (_continueWorkingInBackground)
{
TileCollectionItem q;
lock (_downloadingTiles) {
q = _downloadingTiles.GetHighestPriority();
}
if (q == null)
{
_wakeupDownloader.WaitOne(TimeSpan.FromSeconds(5));
}
else
{
var req = q.Name;
var url = _source.GetTileUrl(req);
var filename = GetTilePath(req);
var tempFile = Path.GetTempFileName();
var downloadedSuccessfully = Http.Download(url, tempFile);
if (downloadedSuccessfully)
{
try {
File.Move(tempFile, filename);
lock (_onDiskTiles) {
_onDiskTiles[req] = true;
}
lock (_downloadingTiles) {
_downloadingTiles.Remove(req);
}
}
catch (Exception) {
}
}
else
{
// Download failed, let's chill out for a bit
_wakeupDownloader.WaitOne(TimeSpan.FromSeconds(5));
}
}
}
}
}
