private void SaveIndexIfDirty()
{
if (!_indexNeedsSaving)
{
return;
}
List <Entry> toSave = null;
RunSyncWithLock(() =>
{
toSave = _entriesByHttpUrl.Values.ToList();
_indexNeedsSaving = false;
});
try
{
var textConvert = TextConvert;
if (textConvert == null)
{
return;
}
var text = TextConvert.SerializeObject(toSave);
var store = MvxFileStoreHelper.SafeGetFileStore();
store.WriteFile(IndexFilePath, text);
}
catch (Exception exception)
{
MvxTrace.Warning("Failed to save cache index {0} - reason {1}", _cacheFolder,
exception.ToLongString());
}
}
private void DeleteNextUnneededFile()
{
string nextFileToDelete = "";
RunSyncWithLock(() =>
{
nextFileToDelete = _toDeleteFiles.FirstOrDefault();
});
if (string.IsNullOrEmpty(nextFileToDelete))
{
return;
}
try
{
var fileService = MvxFileStoreHelper.SafeGetFileStore();
if (fileService.Exists(nextFileToDelete))
{
fileService.DeleteFile(nextFileToDelete);
}
}
catch (Exception exception)
{
MvxTrace.Warning("Problem seen deleting file {0} problem {1}", nextFileToDelete,
exception.ToLongString());
}
}
private Dictionary <string, Entry> LoadIndexEntries()
{
try
{
var store = MvxFileStoreHelper.SafeGetFileStore();
string text;
if (store.TryReadTextFile(IndexFilePath, out text))
{
var textConvert = TextConvert;
if (textConvert == null)
{
return(new Dictionary <string, Entry>());
}
var list = textConvert.DeserializeObject <List <Entry> >(text);
return(list.ToDictionary(x => x.HttpSource, x => x));
}
}
//catch (ThreadAbortException)
//{
// throw;
//}
catch (Exception exception)
{
MvxTrace.Warning("Failed to read cache index {0} - reason {1}", _cacheFolder,
exception.ToLongString());
}
return(new Dictionary <string, Entry>());
}
private void QueueUnindexedFilesForDelete()
{
var store = MvxFileStoreHelper.SafeGetFileStore();
var files = store.GetFilesIn(_cacheFolder);
// we don't use Linq because of AOT/JIT problem on MonoTouch :/
//var cachedFiles = _entriesByHttpUrl.ToDictionary(x => x.Value.DownloadedPath);
var cachedFiles = new Dictionary <string, Entry>();
foreach (var e in _entriesByHttpUrl)
{
cachedFiles[e.Value.DownloadedPath] = e.Value;
}
var toDelete = new List <string>();
foreach (var file in files)
{
if (!cachedFiles.ContainsKey(file))
{
if (!file.EndsWith(CacheIndexFileName))
{
toDelete.Add(file);
}
}
}
RunSyncOrAsyncWithLock(() =>
{
_toDeleteFiles.AddRange(toDelete);
});
}
private void DoRequestLocalFilePath(string httpSource, Action <string> success, Action <Exception> error)
{
RunSyncOrAsyncWithLock(() =>
{
Entry diskEntry;
if (_entriesByHttpUrl.TryGetValue(httpSource, out diskEntry))
{
var service = MvxFileStoreHelper.SafeGetFileStore();
if (!service.Exists(diskEntry.DownloadedPath))
{
_entriesByHttpUrl.Remove(httpSource);
}
else
{
diskEntry.WhenLastAccessedUtc = DateTime.UtcNow;
DoFilePathCallback(diskEntry, success, error);
return;
}
}
List <CallbackPair> currentlyRequested;
if (_currentlyRequested.TryGetValue(httpSource, out currentlyRequested))
{
currentlyRequested.Add(new CallbackPair(success, error));
return;
}
currentlyRequested = new List <CallbackPair>
{
new CallbackPair(success, error)
};
_currentlyRequested.Add(httpSource, currentlyRequested);
var downloader = Mvx.Resolve <IMvxHttpFileDownloader>();
var fileService = MvxFileStoreHelper.SafeGetFileStore();
var pathForDownload = fileService.PathCombine(_cacheFolder, Guid.NewGuid().ToString("N"));
downloader.RequestDownload(httpSource, pathForDownload,
() => OnDownloadSuccess(httpSource, pathForDownload),
(exception) => OnDownloadError(httpSource, exception));
});
}
private void ProcessResponse(WebRequest request, IAsyncResult result)
{
try
{
var fileService = MvxFileStoreHelper.SafeGetFileStore();
var tempFilePath = DownloadPath + ".tmp";
using (var resp = request.EndGetResponse(result))
{
using (var s = resp.GetResponseStream())
{
fileService.WriteFile(tempFilePath,
(fileStream) =>
{
var buffer = new byte[4 * 1024];
int count;
while ((count = s.Read(buffer, 0, buffer.Length)) > 0)
{
fileStream.Write(buffer, 0, count);
}
});
}
}
fileService.TryMove(tempFilePath, DownloadPath, true);
}
//#if !NETFX_CORE
// catch (ThreadAbortException)
// {
// throw;
// }
//#endif
catch (Exception exception)
{
FireDownloadFailed(exception);
return;
}
FireDownloadComplete();
}
private void EnsureCacheFolderExists()
{
var store = MvxFileStoreHelper.SafeGetFileStore();
store.EnsureFolderExists(_cacheFolder);
}
