/// <summary>
/// Callback for the Upload HttpWebRequest.beginGetRequestStream
/// </summary>
private void WriteUploadRequestStream(Stream requestStream, AsyncArgsWrapper wrapper)
{
try
{
// Create a SyncWriter to write the contents
this.syncWriter = (SerializationFormat == SerializationFormat.ODataAtom)
? new ODataAtomWriter(BaseUri)
: (SyncWriter) new ODataJsonWriter(BaseUri);
syncWriter.StartFeed(wrapper.CacheRequest.IsLastBatch, wrapper.CacheRequest.KnowledgeBlob ?? new byte[0]);
foreach (IOfflineEntity entity in wrapper.CacheRequest.Changes)
{
// Skip tombstones that dont have a ID element.
if (entity.GetServiceMetadata().IsTombstone&& string.IsNullOrEmpty(entity.GetServiceMetadata().Id))
{
continue;
}
string tempId = null;
// Check to see if this is an insert. i.e ServiceMetadata.Id is null or empty
if (string.IsNullOrEmpty(entity.GetServiceMetadata().Id))
{
if (wrapper.TempIdToEntityMapping == null)
{
wrapper.TempIdToEntityMapping = new Dictionary <string, IOfflineEntity>();
}
tempId = Guid.NewGuid().ToString();
wrapper.TempIdToEntityMapping.Add(tempId, entity);
}
syncWriter.AddItem(entity, tempId);
}
if (SerializationFormat == SerializationFormat.ODataAtom)
{
syncWriter.WriteFeed(XmlWriter.Create(requestStream));
}
else
{
this.syncWriter.WriteFeed(new XmlJsonWriter(requestStream));
}
requestStream.Flush();
}
catch (Exception e)
{
if (ExceptionUtility.IsFatal(e))
{
throw;
}
wrapper.Error = e;
}
}
// This method ensures that we have a valid feed through the formatters. The BodyWriter delegate in WCF
// seems to not recover from an unhandled exception caused by the formatters and sends out an empty response to the caller.
// This is a workaround for this issue until we find a better solution.
private SyncWriter GetSyncWriterWithContents()
{
// Get the appropriate SyncWriter instance based on the serialization format.
SyncWriter oDataWriter = WebUtil.GetSyncWriter(_responseSerializationFormat, _baseUri);
oDataWriter.StartFeed(_getChangesResponse.IsLastBatch, _getChangesResponse.ServerBlob);
// Write entities for response.
foreach (var entity in _getChangesResponse.EntityList)
{
// Set the Id and add item with a null tempId.
entity.ServiceMetadata.Id = WebUtil.GenerateOfflineEntityId(entity);
oDataWriter.AddItem(entity, null /*tempId*/);
}
return(oDataWriter);
}
NSData CreateRequestBody()
{
_syncWriter = (SyncWriter) new ODataAtomWriter(base.BaseUri);
_syncWriter.StartFeed(_wrapper.CacheRequest.IsLastBatch, _wrapper.CacheRequest.KnowledgeBlob ?? new byte[0]);
MemoryStream requestStream = new MemoryStream();
if (_wrapper.CacheRequest.RequestType == CacheRequestType.UploadChanges)
{
foreach (IOfflineEntity entity in _wrapper.CacheRequest.Changes)
{
// Skip tombstones that dont have a ID element.
if (entity.ServiceMetadata.IsTombstone && string.IsNullOrEmpty(entity.ServiceMetadata.Id))
{
continue;
}
string tempId = null;
// Check to see if this is an insert. i.e ServiceMetadata.Id is null or empty
if (string.IsNullOrEmpty(entity.ServiceMetadata.Id))
{
if (_wrapper.TempIdToEntityMapping == null)
{
_wrapper.TempIdToEntityMapping = new Dictionary <string, IOfflineEntity> ();
}
tempId = Guid.NewGuid().ToString();
_wrapper.TempIdToEntityMapping.Add(tempId, entity);
}
_syncWriter.AddItem(entity, tempId);
}
}
if (base.SerializationFormat == SerializationFormat.ODataAtom)
{
_syncWriter.WriteFeed(XmlWriter.Create(requestStream));
}
else
{
_syncWriter.WriteFeed(JsonReaderWriterFactory.CreateJsonWriter(requestStream));
}
string result = "";
requestStream.Seek(0, SeekOrigin.Begin);
using (StreamReader reader = new StreamReader(requestStream)) {
result = reader.ReadToEnd();
}
requestStream.Flush();
requestStream.Close();
NSString dataString = new NSString(result);
return(dataString.DataUsingEncoding(NSStringEncoding.UTF8));
}