/// <summary>
/// OfflineSyncProvider method implementation to return a set of sync changes.
/// </summary>
/// <param name="state">A unique identifier for the changes that are uploaded</param>
/// <returns>The set of incremental changes to send to the service</returns>
public override ChangeSet GetChangeSet(Guid state)
{
var changeSet = new ChangeSet();
IEnumerable<SqlCeOfflineEntity> changes = _storageHandler.GetChanges(state);
changeSet.Data = changes.Select(c => (IOfflineEntity) c).ToList();
changeSet.IsLastBatch = true;
changeSet.ServerBlob = _storageHandler.GetAnchor();
return changeSet;
}
private object ProcessDownloadRequest(HttpWebRequest webRequest, CacheRequest request)
{
using (Stream memoryStream = new MemoryStream())
{
// Create a SyncWriter to write the contents
this._syncWriter = new ODataAtomWriter(base.BaseUri);
this._syncWriter.StartFeed(true, request.KnowledgeBlob ?? new byte[0]);
this._syncWriter.WriteFeed(XmlWriter.Create(memoryStream));
memoryStream.Flush();
webRequest.ContentLength = memoryStream.Position;
Stream requestStream = webRequest.GetRequestStream();
CopyStreamContent(memoryStream, requestStream);
requestStream.Flush();
requestStream.Close();
// Fire the Before request handler
this.FirePreRequestHandler(webRequest);
}
// Get the response
HttpWebResponse webResponse = (HttpWebResponse)webRequest.GetResponse();
if (webResponse.StatusCode == HttpStatusCode.OK)
{
ChangeSet changeSet = new ChangeSet();
using (Stream responseStream = webResponse.GetResponseStream())
{
// Create the SyncReader
this._syncReader = new ODataAtomReader(responseStream, this._knownTypes);
// Read the response
while (this._syncReader.Next())
{
switch (this._syncReader.ItemType)
{
case ReaderItemType.Entry:
changeSet.AddItem(this._syncReader.GetItem());
break;
case ReaderItemType.SyncBlob:
changeSet.ServerBlob = this._syncReader.GetServerBlob();
break;
case ReaderItemType.HasMoreChanges:
changeSet.IsLastBatch = !this._syncReader.GetHasMoreChangesValue();
break;
}
}
this.FirePostResponseHandler(webResponse);
}
webResponse.Close();
return changeSet;
}
else
{
throw new CacheControllerException(
string.Format("Remote service returned error status. Status: {0}, Description: {1}",
webResponse.StatusCode,
webResponse.StatusDescription));
}
}
/// <summary>
/// OfflineSyncProvider method called to save changes retrieved from the sync service.
/// </summary>
/// <param name="changeSet">The set of changes from the service to save. Also contains an updated server
/// blob.</param>
public override void SaveChangeSet(ChangeSet changeSet)
{
if (null == changeSet)
{
throw new ArgumentException("changeSet is null", "changeSet");
}
var entities = changeSet.Data.Cast<SqlCeOfflineEntity>();
_storageHandler.SaveDownloadedChanges(changeSet.ServerBlob, entities);
}
public abstract void SaveChangeSet(ChangeSet changeSet);
