/// <summary>
/// Generate the batch request for all changes to save.
/// </summary>
/// <returns>Returns the instance of ODataRequestMessage containing all the headers and payload for the batch request.</returns>
private ODataRequestMessageWrapper GenerateBatchRequest()
{
if (this.ChangedEntries.Count == 0 && this.Queries == null)
{
this.SetCompleted();
return(null);
}
ODataRequestMessageWrapper batchRequestMessage = this.CreateBatchRequest();
// we need to fire request after the headers have been written, but before we write the payload
batchRequestMessage.FireSendingRequest2(null);
using (ODataMessageWriter messageWriter = Serializer.CreateMessageWriter(batchRequestMessage, this.RequestInfo, false /*isParameterPayload*/))
{
this.batchWriter = messageWriter.CreateODataBatchWriter();
this.batchWriter.WriteStartBatch();
if (this.Queries != null)
{
foreach (DataServiceRequest query in this.Queries)
{
QueryComponents queryComponents = query.QueryComponents(this.RequestInfo.Model);
Uri requestUri = this.RequestInfo.BaseUriResolver.GetOrCreateAbsoluteUri(queryComponents.Uri);
Debug.Assert(requestUri != null, "request uri is null");
Debug.Assert(requestUri.IsAbsoluteUri, "request uri is not absolute uri");
HeaderCollection headers = new HeaderCollection();
headers.SetRequestVersion(queryComponents.Version, this.RequestInfo.MaxProtocolVersionAsVersion);
this.RequestInfo.Format.SetRequestAcceptHeaderForQuery(headers, queryComponents);
ODataRequestMessageWrapper batchOperationRequestMessage = this.CreateRequestMessage(XmlConstants.HttpMethodGet, requestUri, headers, this.RequestInfo.HttpStack, null /*descriptor*/, null /*contentId*/);
batchOperationRequestMessage.FireSendingEventHandlers(null /*descriptor*/);
}
}
else if (0 < this.ChangedEntries.Count)
{
if (Util.IsBatchWithSingleChangeset(this.Options))
{
this.batchWriter.WriteStartChangeset();
}
var model = this.RequestInfo.Model;
for (int i = 0; i < this.ChangedEntries.Count; ++i)
{
if (Util.IsBatchWithIndependentOperations(this.Options))
{
this.batchWriter.WriteStartChangeset();
}
Descriptor descriptor = this.ChangedEntries[i];
if (descriptor.ContentGeneratedForSave)
{
continue;
}
EntityDescriptor entityDescriptor = descriptor as EntityDescriptor;
if (descriptor.DescriptorKind == DescriptorKind.Entity)
{
if (entityDescriptor.State == EntityStates.Added)
{
// We don't support adding MLE/MR in batch mode
ClientTypeAnnotation type = model.GetClientTypeAnnotation(model.GetOrCreateEdmType(entityDescriptor.Entity.GetType()));
if (type.IsMediaLinkEntry || entityDescriptor.IsMediaLinkEntry)
{
throw Error.NotSupported(Strings.Context_BatchNotSupportedForMediaLink);
}
}
else if (entityDescriptor.State == EntityStates.Unchanged || entityDescriptor.State == EntityStates.Modified)
{
// We don't support PUT for the MR in batch mode
// It's OK to PUT the MLE alone inside a batch mode though
if (entityDescriptor.SaveStream != null)
{
throw Error.NotSupported(Strings.Context_BatchNotSupportedForMediaLink);
}
}
}
else if (descriptor.DescriptorKind == DescriptorKind.NamedStream)
{
// Similar to MR, we do not support adding named streams in batch mode.
throw Error.NotSupported(Strings.Context_BatchNotSupportedForNamedStreams);
}
ODataRequestMessageWrapper operationRequestMessage;
if (descriptor.DescriptorKind == DescriptorKind.Entity)
{
operationRequestMessage = this.CreateRequest(entityDescriptor);
}
else
{
operationRequestMessage = this.CreateRequest((LinkDescriptor)descriptor);
}
// we need to fire request after the headers have been written, but before we write the payload
operationRequestMessage.FireSendingRequest2(descriptor);
this.CreateChangeData(i, operationRequestMessage);
if (Util.IsBatchWithIndependentOperations(this.Options))
{
this.batchWriter.WriteEndChangeset();
}
}
if (Util.IsBatchWithSingleChangeset(this.Options))
{
this.batchWriter.WriteEndChangeset();
}
}
this.batchWriter.WriteEndBatch();
this.batchWriter.Flush();
}
Debug.Assert(this.ChangedEntries.All(o => o.ContentGeneratedForSave), "didn't generated content for all entities/links");
return(batchRequestMessage);
}
/// <summary>
/// Create request message from the next change.
/// </summary>
/// <returns>An instance of ODataRequestMessage for the next change.</returns>
private ODataRequestMessageWrapper CreateNextRequest()
{
bool moveForward = this.streamRequestKind == StreamRequestKind.None;
if (unchecked ((uint)this.entryIndex < (uint)this.ChangedEntries.Count))
{
Descriptor previousDescriptor = this.ChangedEntries[this.entryIndex];
if (previousDescriptor.DescriptorKind == DescriptorKind.Entity)
{
EntityDescriptor entityDescriptor = (EntityDescriptor)previousDescriptor;
// In any case also close the save stream if there's any and forget about it
// for POST this is just a good practice to do so as soon as possible
// for PUT it's actually required for us to recognize that we already processed the MR part of the change
entityDescriptor.CloseSaveStream();
// If the previous request was an MR request the next one might be a PUT for the MLE
// but if the entity was not changed (just the MR changed) no PUT for MLE should be sent
if (this.streamRequestKind == StreamRequestKind.PutMediaResource && EntityStates.Unchanged == entityDescriptor.State)
{
// Only the MR changed. In this case we also need to mark the descriptor as processed to notify
// that the content for save has been generated as there's not going to be another request for it.
entityDescriptor.ContentGeneratedForSave = true;
moveForward = true;
}
}
else if (previousDescriptor.DescriptorKind == DescriptorKind.NamedStream)
{
((StreamDescriptor)previousDescriptor).CloseSaveStream();
}
}
if (moveForward)
{
this.entryIndex++;
}
ODataRequestMessageWrapper requestMessage = null;
if (unchecked ((uint)this.entryIndex < (uint)this.ChangedEntries.Count))
{
Descriptor descriptor = this.ChangedEntries[this.entryIndex];
Descriptor descriptorForSendingRequest2 = descriptor;
if (descriptor.DescriptorKind == DescriptorKind.Entity)
{
EntityDescriptor entityDescriptor = (EntityDescriptor)descriptor;
if (((descriptor.State == EntityStates.Unchanged) || (descriptor.State == EntityStates.Modified)) &&
((requestMessage = this.CheckAndProcessMediaEntryPut(entityDescriptor)) != null))
{
this.streamRequestKind = StreamRequestKind.PutMediaResource;
descriptorForSendingRequest2 = entityDescriptor.DefaultStreamDescriptor; // We want to give SendingRequest2 the StreamDescriptor
}
else if ((descriptor.State == EntityStates.Added) && ((requestMessage = this.CheckAndProcessMediaEntryPost(entityDescriptor)) != null))
{
this.streamRequestKind = StreamRequestKind.PostMediaResource;
Debug.Assert(entityDescriptor.SaveStream == null || entityDescriptor.StreamState == EntityStates.Added, "Either this is a V1 MR or the stream must be in added state");
// Set the stream state to added
// For V1 scenarios, when SetSaveStream was not called, this might not be in Added state
entityDescriptor.StreamState = EntityStates.Added;
}
else
{
this.streamRequestKind = StreamRequestKind.None;
Debug.Assert(descriptor.State != EntityStates.Unchanged, "descriptor.State != EntityStates.Unchanged");
requestMessage = this.CreateRequest(entityDescriptor);
}
}
else if (descriptor.DescriptorKind == DescriptorKind.NamedStream)
{
requestMessage = this.CreateNamedStreamRequest((StreamDescriptor)descriptor);
}
else
{
requestMessage = this.CreateRequest((LinkDescriptor)descriptor);
}
if (requestMessage != null)
{
// we need to fire request after the headers have been written, but before we write the payload
// also in the prototype we are firing SendingRequest2 before SendingRequest.
requestMessage.FireSendingEventHandlers(descriptorForSendingRequest2);
}
}
return(requestMessage);
}
