private static async Task LoadQueueInternalAsync(IotHubClient client)
{
System.Collections.Generic.Queue<DataPoint> tmp = new System.Collections.Generic.Queue<DataPoint>();
try
{
StorageFolder storageFolder = ApplicationData.Current.LocalFolder;
StorageFile file = await storageFolder.GetFileAsync(FILE_NAME);
var stream = await file.OpenAsync(FileAccessMode.ReadWrite);
ulong size = stream.Size;
using (var inputStream = stream.GetInputStreamAt(0))
{
using (var dataReader = new DataReader(inputStream))
{
uint numBytesLoaded = await dataReader.LoadAsync((uint)size);
int count = dataReader.ReadInt32();
for (int i = 0; i < count; i++)
{
DataPoint p = new DataPoint();
p.Read(dataReader);
tmp.Enqueue(p);
}
}
}
stream.Dispose();
lock (client.thisLock)
{
client.queue.Clear();
client.queue = null;
client.queue = new System.Collections.Generic.Queue<DataPoint>(tmp);
}
}
catch (Exception) { }
}
private static async Task SaveQueueInternalAsync(IotHubClient client)
{
try
{
System.Collections.Generic.Queue<DataPoint> tmp = null;
lock (client.thisLock)
{
tmp = new System.Collections.Generic.Queue<DataPoint>(client.queue);
}
StorageFolder storageFolder = ApplicationData.Current.LocalFolder;
StorageFile file = await storageFolder.CreateFileAsync(FILE_NAME, CreationCollisionOption.ReplaceExisting);
var stream = await file.OpenAsync(Windows.Storage.FileAccessMode.ReadWrite);
using (var outputStream = stream.GetOutputStreamAt(0))
{
using (var dataWriter = new DataWriter(outputStream))
{
dataWriter.WriteInt32(tmp.Count);
foreach (var item in tmp) { item.Write(dataWriter); }
await dataWriter.StoreAsync();
await outputStream.FlushAsync();
}
}
stream.Dispose();
}
catch (Exception) { }
}