public override object LoadChangeData(Microsoft.Synchronization.LoadChangeContext loadChangeContext)
{
ItemMetadata item;
metadataStore.TryGetItem(loadChangeContext.ItemChange.ItemId, out item);
if (item.IsTombstone)
{
throw new InvalidOperationException("Cannot load change data for a deleted item.");
}
Stream dataStream = new FileStream(Path.Combine(folderPath, item.Uri), FileMode.Open, FileAccess.Read, FileShare.Read);
DataTransfer transferMechanism = new DataTransfer(dataStream, item.Uri);
return transferMechanism;
}
public override object LoadChangeData(Microsoft.Synchronization.LoadChangeContext loadChangeContext)
{
ItemMetadata item;
metadataStore.TryGetItem(loadChangeContext.ItemChange.ItemId, out item);
if (item.IsTombstone)
{
throw new InvalidOperationException("Cannot load change data for a deleted item.");
}
System.Diagnostics.Debug.WriteLine("Downloading File:" + item.Uri);
Stream dataStream = service.DownloadFile(item.Uri);
DataTransfer transferMechanism = new DataTransfer(dataStream, item.Uri);
return transferMechanism;
}
public ItemMetadata GetItemMetaData(SaveChangeAction saveChangeAction, ItemChange change, DataTransfer data)
{
ItemMetadata item;
if (saveChangeAction == SaveChangeAction.UpdateVersionOnly || ((change.ChangeKind & ChangeKind.Deleted) == ChangeKind.Deleted))
{
if (!metadataStore.TryGetItem(change.ItemId, out item))
{
item = new ItemMetadata();
item.Uri = String.Empty;
}
}
else
{
item = new ItemMetadata();
item.Uri = data.Uri;
}
item.ItemId = change.ItemId;
item.CreationVersion = change.CreationVersion;
item.ChangeVersion = change.ChangeVersion;
if ((change.ChangeKind & ChangeKind.Deleted) == ChangeKind.Deleted)
item.IsTombstone = true;
if (!metadataStore.Has(item.ItemId))
{
ItemMetadata oldItem;
if (metadataStore.TryGetItem(item.Uri, out oldItem))
{
if (item.ItemId.CompareTo(oldItem.ItemId) > 0)
{
oldItem.IsTombstone = true;
oldItem.Uri = String.Empty;
oldItem.ChangeVersion = new SyncVersion(0, tickCount);
}
else
{
item.IsTombstone = true;
item.Uri = String.Empty;
item.ChangeVersion = new SyncVersion(0, tickCount);
}
metadataStore.SetItemInfo(item);
metadataStore.SetItemInfo(oldItem);
}
}
metadataStore.SetItemInfo(item);
return item;
}
private void UpdateOrCreateFile(DataTransfer data, ItemMetadata item)
{
FileInfo fileInfo = new FileInfo(Path.Combine(folderPath, item.Uri));
if (!fileInfo.Directory.Exists)
fileInfo.Directory.Create();
using (FileStream outputStream = new FileStream(Path.Combine(folderPath, item.Uri), FileMode.OpenOrCreate))
{
const int copyBlockSize = 4096;
byte[] buffer = new byte[copyBlockSize];
int bytesRead;
while ((bytesRead = data.DataStream.Read(buffer, 0, copyBlockSize)) > 0)
outputStream.Write(buffer, 0, bytesRead);
outputStream.SetLength(outputStream.Position);
}
item.LastWriteTimeUtc = fileInfo.LastWriteTimeUtc;
data.DataStream.Close();
}