/// <summary>
/// Creates a StreamDescriptor class with the given name and other information
/// </summary>
/// <param name="name">name of the stream.</param>
/// <param name="entityDescriptor">instance of entity descriptor that contains this stream.</param>
internal StreamDescriptor(string name, EntityDescriptor entityDescriptor) : base(EntityStates.Unchanged)
{
Debug.Assert(!String.IsNullOrEmpty(name), "!String.IsNullOrEmpty(name)");
Debug.Assert(entityDescriptor != null, "entityDescriptor != null");
this.streamLink = new DataServiceStreamLink(name);
this.entityDescriptor = entityDescriptor;
}
/// <summary>
/// Creates a StreamDescriptor class for the default stream (MR) associated with an entity.
/// </summary>
/// <param name="entityDescriptor">instance of entity descriptor that contains this stream.</param>
internal StreamDescriptor(EntityDescriptor entityDescriptor)
: base(EntityStates.Unchanged)
{
Debug.Assert(entityDescriptor != null, "entityDescriptor != null");
this.streamLink = new DataServiceStreamLink(null);
this.entityDescriptor = entityDescriptor;
}
/// <summary>
/// Instantiates a new Serializer class and calls WriteEntry method on it.
/// </summary>
/// <param name="dataServiceContext"></param>
/// <returns></returns>
private static Person SetupSerializerAndCallWriteEntry(DataServiceContext dataServiceContext)
{
Person person = new Person();
Address address = new Address();
Car car1 = new Car();
person.Cars.Add(car1);
person.HomeAddress = address;
dataServiceContext.AttachTo("Cars", car1);
dataServiceContext.AttachTo("Addresses", address);
var requestInfo = new RequestInfo(dataServiceContext);
var serializer = new Serializer(requestInfo);
var headers = new HeaderCollection();
var clientModel = new ClientEdmModel(ODataProtocolVersion.V4);
var entityDescriptor = new EntityDescriptor(clientModel);
entityDescriptor.State = EntityStates.Added;
entityDescriptor.Entity = person;
var requestMessageArgs = new BuildingRequestEventArgs("POST", new Uri("http://www.foo.com/Northwind"), headers, entityDescriptor, HttpStack.Auto);
var linkDescriptors = new LinkDescriptor[] { new LinkDescriptor(person, "Cars", car1, clientModel), new LinkDescriptor(person, "HomeAddress", address, clientModel) };
var odataRequestMessageWrapper = ODataRequestMessageWrapper.CreateRequestMessageWrapper(requestMessageArgs, requestInfo);
serializer.WriteEntry(entityDescriptor, linkDescriptors, odataRequestMessageWrapper);
return person;
}
/// <summary>
/// Creates a new instance of MaterializerEntry using the given entity descriptor for LoadProperty.
/// </summary>
/// <param name="entityDescriptor">Entity descriptor.</param>
/// <param name="format">OData Format.</param>
/// <param name="isTracking">Whether this entity is being tracked.</param>
/// <remarks>Use this constructor only for LoadProperty scenario.</remarks>
private MaterializerEntry(EntityDescriptor entityDescriptor, ODataFormat format, bool isTracking)
{
this.entityDescriptor = entityDescriptor;
this.Format = format;
#pragma warning disable 618
this.isAtomOrTracking = isTracking || this.Format == ODataFormat.Atom;
#pragma warning restore 618
this.SetFlagValue(EntryFlags.ShouldUpdateFromPayload | EntryFlags.EntityHasBeenResolved | EntryFlags.ForLoadProperty, true);
}
public void Init()
{
this.clientEdmModel = new ClientEdmModel(ODataProtocolVersion.V4);
this.entityDescriptor = new EntityDescriptor(this.clientEdmModel) { Entity = new Customer() };
var serverType = new EdmEntityType("FQ.NS", "MyServerType");
serverType.AddUnidirectionalNavigation(new EdmNavigationPropertyInfo { Name = "Navigation", Target = serverType, TargetMultiplicity = EdmMultiplicity.ZeroOrOne });
this.serverTypeName = ((IEdmSchemaElement)serverType).FullName();
var serverContainer = new EdmEntityContainer("FQ.NS", "MyContainer");
this.serverEntitySet = serverContainer.AddEntitySet("MyEntitySet", serverType);
var serverModel = new EdmModel();
serverModel.AddElement(serverType);
serverModel.AddElement(serverContainer);
this.ctx = new DataServiceContext(new Uri("http://temp.org/"), ODataProtocolVersion.V4, this.clientEdmModel);
this.ctx.Format.UseJson(serverModel);
this.testSubject = new RequestInfo(ctx);
}
/// <summary>
/// Creates a new instance of MaterializerEntry.
/// </summary>
/// <param name="entry">The entry.</param>
/// <param name="format">The format the entry was read in.</param>
/// <param name="isTracking">True if the contents of the entry will be tracked in the context, otherwise False.</param>
/// <param name="model">The client model.</param>
private MaterializerEntry(ODataEntry entry, ODataFormat format, bool isTracking, ClientEdmModel model)
{
Debug.Assert(entry != null, "entry != null");
this.entry = entry;
this.Format = format;
this.entityDescriptor = new EntityDescriptor(model);
#pragma warning disable 618
this.isAtomOrTracking = isTracking || this.Format == ODataFormat.Atom;
#pragma warning restore 618
string serverTypeName = this.Entry.TypeName;
SerializationTypeNameAnnotation serializationTypeNameAnnotation = entry.GetAnnotation<SerializationTypeNameAnnotation>();
if (serializationTypeNameAnnotation != null)
{
// If the annotation has a value use it. Otherwise, in JSON-Light, the types can be inferred from the
// context URI even if they are not present on the wire, so just use the type name from the entry.
if (serializationTypeNameAnnotation.TypeName != null || this.Format != ODataFormat.Json)
{
serverTypeName = serializationTypeNameAnnotation.TypeName;
}
}
this.entityDescriptor.ServerTypeName = serverTypeName;
}
/// <summary>
/// Attach entity into the context in the Unchanged state.
/// </summary>
/// <param name="entityDescriptorFromMaterializer">entity descriptor from the response</param>
/// <param name="failIfDuplicated">fail for public api else change existing relationship to unchanged</param>
/// <remarks>Caller should validate descriptor instance.</remarks>
/// <returns>The attached descriptor, if one already exists in the context and failIfDuplicated is set to false, then the existing instance is returned</returns>
/// <exception cref="InvalidOperationException">if entity is already being tracked by the context</exception>
/// <exception cref="InvalidOperationException">if identity is pointing to another entity</exception>
internal override EntityDescriptor InternalAttachEntityDescriptor(EntityDescriptor entityDescriptorFromMaterializer, bool failIfDuplicated)
{
Debug.Assert((null != entityDescriptorFromMaterializer.Identity), "must have identity");
Debug.Assert(null != entityDescriptorFromMaterializer.Entity && ClientTypeUtil.TypeIsEntity(entityDescriptorFromMaterializer.Entity.GetType(), this.model), "must be entity type to attach");
this.EnsureIdentityToResource();
EntityDescriptor trackedEntityDescriptor;
this.entityDescriptors.TryGetValue(entityDescriptorFromMaterializer.Entity, out trackedEntityDescriptor);
EntityDescriptor existing;
this.identityToDescriptor.TryGetValue(entityDescriptorFromMaterializer.Identity, out existing);
// identity existing & pointing to something else
if (failIfDuplicated && (null != trackedEntityDescriptor))
{
throw Error.InvalidOperation(Strings.Context_EntityAlreadyContained);
}
else if (trackedEntityDescriptor != existing)
{
throw Error.InvalidOperation(Strings.Context_DifferentEntityAlreadyContained);
}
else if (null == trackedEntityDescriptor)
{
trackedEntityDescriptor = entityDescriptorFromMaterializer;
// if resource doesn't exist...
this.IncrementChange(entityDescriptorFromMaterializer);
this.entityDescriptors.Add(entityDescriptorFromMaterializer.Entity, entityDescriptorFromMaterializer);
this.identityToDescriptor.Add(entityDescriptorFromMaterializer.Identity, entityDescriptorFromMaterializer);
}
// DEVNOTE(pqian):
// we used to mark the descriptor as Unchanged
// but it's now up to the caller to do that
return trackedEntityDescriptor;
}
internal void DetachResourceIdentity(EntityDescriptor resource)
{
EntityDescriptor existing = null;
if ((null != resource.Identity) &&
this.identityToDescriptor.TryGetValue(resource.Identity, out existing) &&
Object.ReferenceEquals(existing, resource))
{
bool removed = this.identityToDescriptor.Remove(resource.Identity);
Debug.Assert(removed, "should have removed existing identity");
}
}
/// <summary>
/// Adds the given entity descriptors to the list of the tracked entity descriptors.
/// </summary>
/// <param name="descriptor">entity descriptor instance to be added.</param>
internal void AddEntityDescriptor(EntityDescriptor descriptor)
{
try
{
this.entityDescriptors.Add(descriptor.Entity, descriptor);
}
catch (ArgumentException)
{
throw Error.InvalidOperation(Strings.Context_EntityAlreadyContained);
}
}
/// <summary>
/// Write the entry element.
/// </summary>
/// <param name="entityDescriptor">The entity.</param>
/// <param name="relatedLinks">Collection of links related to the entity.</param>
/// <param name="requestMessage">The OData request message.</param>
internal void WriteEntry(EntityDescriptor entityDescriptor, IEnumerable<LinkDescriptor> relatedLinks, ODataRequestMessageWrapper requestMessage)
{
ClientEdmModel model = this.requestInfo.Model;
ClientTypeAnnotation entityType = model.GetClientTypeAnnotation(model.GetOrCreateEdmType(entityDescriptor.Entity.GetType()));
using (ODataMessageWriter messageWriter = Serializer.CreateMessageWriter(requestMessage, this.requestInfo, false /*isParameterPayload*/))
{
ODataWriterWrapper entryWriter = ODataWriterWrapper.CreateForEntry(messageWriter, this.requestInfo.Configurations.RequestPipeline);
// Get the server type name using the type resolver or from the entity descriptor
string serverTypeName = this.requestInfo.GetServerTypeName(entityDescriptor);
var entry = CreateODataEntry(entityDescriptor, serverTypeName, entityType, this.requestInfo.Format);
if (serverTypeName == null)
{
serverTypeName = this.requestInfo.InferServerTypeNameFromServerModel(entityDescriptor);
}
IEnumerable<ClientPropertyAnnotation> properties;
if ((!Util.IsFlagSet(this.options, SaveChangesOptions.ReplaceOnUpdate) &&
entityDescriptor.State == EntityStates.Modified &&
entityDescriptor.PropertiesToSerialize.Any()) ||
(Util.IsFlagSet(this.options, SaveChangesOptions.PostOnlySetProperties) &&
entityDescriptor.State == EntityStates.Added))
{
properties = entityType.PropertiesToSerialize().Where(prop => entityDescriptor.PropertiesToSerialize.Contains(prop.PropertyName));
}
else
{
properties = entityType.PropertiesToSerialize();
}
entry.Properties = this.propertyConverter.PopulateProperties(entityDescriptor.Entity, serverTypeName, properties);
entryWriter.WriteStart(entry, entityDescriptor.Entity);
if (EntityStates.Added == entityDescriptor.State)
{
this.WriteNavigationLink(entityDescriptor, relatedLinks, entryWriter);
}
entryWriter.WriteEnd(entry, entityDescriptor.Entity);
}
}
public void RequestInfoShouldCreateTunneledPatchRequestMessagePostMethodAndPatchInHttpXMethodHeader()
{
bool previousPostTunnelingValue = ctx.UsePostTunneling;
ctx.UsePostTunneling = true;
HeaderCollection headersCollection = new HeaderCollection();
var descriptor = new EntityDescriptor(this.clientEdmModel) { ServerTypeName = this.serverTypeName, Entity = new Customer() };
var buildingRequestArgs = new BuildingRequestEventArgs("PATCH", new Uri("http://localhost/fakeService.svc/"), headersCollection, descriptor, HttpStack.Auto);
var requestMessage = (HttpWebRequestMessage)testSubject.CreateRequestMessage(buildingRequestArgs);
requestMessage.GetHeader(XmlConstants.HttpXMethod).Should().Be("PATCH");
requestMessage.Method.Should().Be("PATCH");
requestMessage.HttpWebRequest.Method.Should().Be("POST");
// undoing change so this is applicable only for this test.
ctx.UsePostTunneling = previousPostTunnelingValue;
}
/// <summary>
/// Returns the instance of LoadPropertyResponseInfo class, which provides information for LoadProperty response handling.
/// </summary>
/// <param name="mergeOption">Merge option to use for conflict handling.</param>
/// <param name="entityDescriptor">Entity whose property is being loaded.</param>
/// <param name="property">Property which is being loaded.</param>
/// <returns>Instance of the LoadPropertyResponseInfo class.</returns>
internal ResponseInfo GetDeserializationInfoForLoadProperty(MergeOption? mergeOption, EntityDescriptor entityDescriptor, ClientPropertyAnnotation property)
{
return new LoadPropertyResponseInfo(
this,
mergeOption.HasValue ? mergeOption.Value : this.Context.MergeOption,
entityDescriptor,
property);
}
/// <summary>
/// Generate a request for the given entity.
/// </summary>
/// <param name="entityDescriptor">Instance of EntityDescriptor.</param>
/// <param name="requestMessage">Instance of IODataRequestMessage to be used to generate the payload.</param>
/// <returns>True if the payload was generated, otherwise false.</returns>
private bool CreateRequestData(EntityDescriptor entityDescriptor, ODataRequestMessageWrapper requestMessage)
{
Debug.Assert(null != entityDescriptor, "null entityDescriptor");
bool generateRequestPayload = false;
switch (entityDescriptor.State)
{
case EntityStates.Deleted:
break;
case EntityStates.Modified:
case EntityStates.Added:
generateRequestPayload = true;
break;
default:
Error.ThrowInternalError(InternalError.UnvalidatedEntityState);
break;
}
if (generateRequestPayload)
{
Debug.Assert(this.SerializerInstance != null, "this.SerializerInstance != null");
this.SerializerInstance.WriteEntry(entityDescriptor, this.RelatedLinks(entityDescriptor), requestMessage);
}
return generateRequestPayload;
}
private static Uri AppendTargetEntityKeyIfNeeded(Uri linkUri, LinkDescriptor binding, EntityDescriptor targetResource)
{
// To delete from a collection, we need to append the key.
// For example: if the navigation property name is "Purchases" and the resource type is Order with key '1', then this method will generate 'baseuri/Purchases(1)'
if (!binding.IsSourcePropertyCollection || EntityStates.Deleted != binding.State)
{
return linkUri;
}
Debug.Assert(targetResource != null, "targetResource != null");
StringBuilder builder = new StringBuilder();
builder.Append(UriUtil.UriToString(linkUri));
builder.Append(UriHelper.QUESTIONMARK + XmlConstants.HttpQueryStringId + UriHelper.EQUALSSIGN + targetResource.Identity);
return UriUtil.CreateUri(builder.ToString(), UriKind.RelativeOrAbsolute);
}
/// <summary>
/// clears all the changes - like closes the save stream, clears the transient entity descriptor.
/// This method is called when the client is done with sending all the pending requests.
/// </summary>
internal override void ClearChanges()
{
this.transientEntityDescriptor = null;
this.CloseSaveStream();
}
/// <summary>Handle changeset response for the given entity descriptor.</summary>
/// <param name="entityDescriptor">entity descriptor whose response is getting handled.</param>
/// <param name="etag">ETag header value from the server response (or null if no etag or if there is an actual response)</param>
private void HandleResponsePost(EntityDescriptor entityDescriptor, string etag)
{
try
{
if (EntityStates.Added != entityDescriptor.State && EntityStates.Added != entityDescriptor.StreamState)
{
Error.ThrowBatchUnexpectedContent(InternalError.EntityNotAddedState);
}
if (this.ProcessResponsePayload)
{
this.MaterializeResponse(entityDescriptor, this.CreateResponseInfo(entityDescriptor), etag);
}
else
{
entityDescriptor.ETag = etag;
entityDescriptor.State = EntityStates.Unchanged;
entityDescriptor.PropertiesToSerialize.Clear();
}
if (entityDescriptor.StreamState != EntityStates.Added)
{
// For MR - entityDescriptor.State is merged, we don't need to do link folding since MR will never fold links.
foreach (LinkDescriptor end in this.RelatedLinks(entityDescriptor))
{
Debug.Assert(0 != end.SaveResultWasProcessed, "link should have been saved with the enty");
// Since we allow link folding on collection properties also, we need to check if the link
// was in added state also, and make sure we put that link in unchanged state.
if (Util.IncludeLinkState(end.SaveResultWasProcessed) || end.SaveResultWasProcessed == EntityStates.Added)
{
HandleResponsePost(end);
}
}
}
}
finally
{
if (entityDescriptor.StreamState == EntityStates.Added)
{
// The materializer will always set the entity state to Unchanged. We just processed Post MR, we
// need to restore the entity state to Modified to process the Put MLE.
Debug.Assert(entityDescriptor.State == EntityStates.Unchanged, "The materializer should always set the entity state to Unchanged.");
entityDescriptor.State = EntityStates.Modified;
// Need to clear the stream state so the next iteration we will always process the Put MLE operation.
entityDescriptor.StreamState = EntityStates.Unchanged;
}
}
}
/// <summary>
/// Infers the server type name for the entity tracked in the given descriptor based on the server model.
/// </summary>
/// <param name="descriptor">The descriptor containing the entity to get the type name for.</param>
/// <returns>The type name or null if it could not be inferred.</returns>
internal string InferServerTypeNameFromServerModel(EntityDescriptor descriptor)
{
Debug.Assert(descriptor != null, "descriptor != null");
Debug.Assert(descriptor.ServerTypeName == null, "Should not be called if the server type name is already known.");
if (descriptor.EntitySetName != null)
{
string serverTypeName;
if (this.TypeResolver.TryResolveEntitySetBaseTypeName(descriptor.EntitySetName, out serverTypeName))
{
return serverTypeName;
}
}
else if (descriptor.IsDeepInsert)
{
string parentServerTypeName = this.GetServerTypeName(descriptor.ParentForInsert);
if (parentServerTypeName == null)
{
parentServerTypeName = this.InferServerTypeNameFromServerModel(descriptor.ParentForInsert);
}
string serverTypeName;
if (this.TypeResolver.TryResolveNavigationTargetTypeName(parentServerTypeName, descriptor.ParentPropertyForInsert, out serverTypeName))
{
return serverTypeName;
}
}
return null;
}
/// <summary>
/// Materialize the response payload.
/// </summary>
/// <param name="entityDescriptor">entity descriptor whose response is getting materialized.</param>
/// <param name="responseInfo">information about the response to be materialized.</param>
/// <param name="etag">etag value, if specified in the response header.</param>
private void MaterializeResponse(EntityDescriptor entityDescriptor, ResponseInfo responseInfo, string etag)
{
using (MaterializeAtom materializer = this.GetMaterializer(entityDescriptor, responseInfo))
{
materializer.SetInsertingObject(entityDescriptor.Entity);
object materializedEntity = null;
foreach (object x in materializer)
{
Debug.Assert(materializedEntity == null, "entity == null");
if (materializedEntity != null)
{
Error.ThrowInternalError(InternalError.MaterializerReturningMoreThanOneEntity);
}
materializedEntity = x;
}
Debug.Assert(null != entityDescriptor.GetLatestIdentity(), "updated inserted should always gain an identity");
Debug.Assert(materializedEntity == entityDescriptor.Entity, "x == entityDescriptor.Entity, should have same object generated by response");
Debug.Assert(EntityStates.Unchanged == entityDescriptor.State, "should have moved out of insert");
Debug.Assert(this.RequestInfo.EntityTracker.TryGetEntityDescriptor(entityDescriptor.GetLatestIdentity()) != null, "should have identity tracked");
// If there was no etag specified in the payload, then we need to set the etag from the header
if (entityDescriptor.GetLatestETag() == null)
{
entityDescriptor.ETag = etag;
}
}
}
/// <summary>
/// Get the materializer to process the response.
/// </summary>
/// <param name="entityDescriptor">entity descriptor whose response is getting materialized.</param>
/// <param name="responseInfo">information about the response to be materialized.</param>
/// <returns>an instance of MaterializeAtom, that can be used to materialize the response.</returns>
/// <remarks>
/// This can only be called from inside the HandleBatchResponse or during enumeration of the responses.
/// This is used when processing responses for update operations.
/// </remarks>
protected override MaterializeAtom GetMaterializer(EntityDescriptor entityDescriptor, ResponseInfo responseInfo)
{
// check if the batch stream is empty or not
Debug.Assert(this.currentOperationResponse != null, "There must be an active operation response for this method to work correctly.");
Debug.Assert(!this.currentOperationResponse.HasEmptyContent, "We should not get here if the response is empty.");
// Since this is used for processing responses to update operations there are no projections to apply.
QueryComponents queryComponents = new QueryComponents(
/*uri*/ null,
Util.ODataVersionEmpty,
entityDescriptor.Entity.GetType(),
/*projection*/ null,
/*normalizerRewrites*/ null);
return new MaterializeAtom(
responseInfo,
queryComponents,
/*projectionPlan*/ null,
this.currentOperationResponse.CreateResponseMessage(),
ODataPayloadKind.Entry);
}
/// <summary>
/// Get the source property Uri for the link URL
/// </summary>
/// <param name="binding">Link descriptor object of the binding</param>
/// <param name="sourceEntityDescriptor">entity descriptor for source</param>
/// <returns>source property Uri string</returns>
private string GetSourcePropertyUri(LinkDescriptor binding, EntityDescriptor sourceEntityDescriptor)
{
Debug.Assert(binding != null, "binding != null");
Debug.Assert(sourceEntityDescriptor != null, "sourceEntityDescriptor != null");
if (string.IsNullOrEmpty(binding.SourceProperty))
{
return null;
}
string sourcePropertyUri = binding.SourceProperty;
// Add type segment in the link URL for the derived entity type on which a navigation property is defined.
// e.g. cxt.Attachto("<entitySetname>",<EntityToBeSource>)
// cxt.AddLink(<EntityToBeSource>, "<NavigationPropertyName>" <EntityToBeTarget>)
// Get entity type name from model (here service model instead of client model should be used)
string entityTypeFullName = this.RequestInfo.TypeResolver.ResolveServiceEntityTypeFullName(binding.Source.GetType());
if (string.IsNullOrEmpty(entityTypeFullName))
{
return sourcePropertyUri;
}
// Get the type of entityset from service model.
string sourceEntitySetTypeName = null;
if (!string.IsNullOrEmpty(sourceEntityDescriptor.EntitySetName) && this.RequestInfo.TypeResolver.TryResolveEntitySetBaseTypeName(sourceEntityDescriptor.EntitySetName, out sourceEntitySetTypeName))
{
// Check whether the entity type and the entity set type are matched. if not matched, set the dervied entity type name as a key segment in the URL.
if (!string.IsNullOrEmpty(sourceEntitySetTypeName) && !string.Equals(entityTypeFullName, sourceEntitySetTypeName, StringComparison.OrdinalIgnoreCase))
{
sourcePropertyUri = entityTypeFullName + UriHelper.FORWARDSLASH + sourcePropertyUri;
}
}
return sourcePropertyUri;
}
public void PostTunnelingDeleteRequestShouldNotHaveContentTypeHeader()
{
bool previousPostTunnelingValue = ctx.UsePostTunneling;
ctx.UsePostTunneling = true;
HeaderCollection headersCollection = new HeaderCollection();
var descriptor = new EntityDescriptor(this.clientEdmModel) { ServerTypeName = this.serverTypeName, Entity = new Customer() };
var buildingRequestArgs = new BuildingRequestEventArgs("DELETE", new Uri("http://localhost/fakeService.svc/"), headersCollection, descriptor, HttpStack.Auto);
ctx.Configurations.RequestPipeline.OnMessageCreating = (args) =>
{
buildingRequestArgs.Headers.Keys.Should().NotContain(XmlConstants.HttpContentType);
return new HttpWebRequestMessage(args);
};
testSubject.CreateRequestMessage(buildingRequestArgs);
// undoing change so this is applicable only for this test.
ctx.UsePostTunneling = previousPostTunnelingValue;
ctx.Configurations.RequestPipeline.OnMessageCreating = null;
}
/// <summary> /// Get the materializer to process the response. /// </summary> /// <param name="entityDescriptor">entity descriptor whose response is getting materialized.</param> /// <param name="responseInfo">information about the response to be materialized.</param> /// <returns>an instance of MaterializeAtom, that can be used to materialize the response.</returns> protected abstract MaterializeAtom GetMaterializer(EntityDescriptor entityDescriptor, ResponseInfo responseInfo);
/// <summary>
/// Creates an ODataEntry for the given EntityDescriptor and fills in its ODataLib metadata.
/// </summary>
/// <param name="entityDescriptor">The entity descriptor.</param>
/// <param name="serverTypeName">Name of the server type.</param>
/// <param name="entityType">The client-side entity type.</param>
/// <param name="clientFormat">The current client format.</param>
/// <returns>An odata entry with its metadata filled in.</returns>
internal static ODataEntry CreateODataEntry(EntityDescriptor entityDescriptor, string serverTypeName, ClientTypeAnnotation entityType, DataServiceClientFormat clientFormat)
{
ODataEntry entry = new ODataEntry();
// If the client type name is different from the server type name, then add SerializationTypeNameAnnotation
// which tells ODataLib to write the type name in the annotation in the payload.
if (entityType.ElementTypeName != serverTypeName)
{
entry.SetAnnotation(new SerializationTypeNameAnnotation { TypeName = serverTypeName });
}
// We always need to write the client type name, since this is the type name used by ODataLib
// to resolve the entity type using EdmModel.FindSchemaElement.
entry.TypeName = entityType.ElementTypeName;
// Continue to send the entry's ID in update payloads in Atom for compatibility with V1-V3,
// but for JSON-Light we do not want the extra information on the wire.
if (clientFormat.UsingAtom && EntityStates.Modified == entityDescriptor.State)
{
// <id>http://host/service/entityset(key)</id>
entry.Id = entityDescriptor.GetLatestIdentity();
}
if (entityDescriptor.IsMediaLinkEntry || entityType.IsMediaLinkEntry)
{
// Since we are already enabled EnableWcfDataServicesClientBehavior in the writer settings,
// setting the MediaResource value will tell ODataLib to write MLE payload, irrespective of
// what the metadata says.
entry.MediaResource = new ODataStreamReferenceValue();
}
return entry;
}
/// <summary>
/// Create the response info instance to be passed to the materializer.
/// </summary>
/// <param name="entityDescriptor">entity descriptor whose response is getting handled.</param>
/// <returns>instance of the response info class.</returns>
protected ResponseInfo CreateResponseInfo(EntityDescriptor entityDescriptor)
{
MergeOption mergeOption = MergeOption.OverwriteChanges;
// If we are processing a POST MR, we want to materialize the payload to get the metadata for the stream.
// However we must not modify the MLE properties with the server initialized properties. The next request
// will be a Put MLE operation and we will set the server properties with values from the client entity.
if (entityDescriptor.StreamState == EntityStates.Added)
{
mergeOption = MergeOption.PreserveChanges;
Debug.Assert(entityDescriptor.State == EntityStates.Modified, "The MLE state must be Modified.");
}
return this.RequestInfo.GetDeserializationInfo(mergeOption);
}
/// <summary>
/// Writes a navigation link.
/// </summary>
/// <param name="entityDescriptor">The entity</param>
/// <param name="relatedLinks">The links related to the entity</param>
/// <param name="odataWriter">The ODataWriter used to write the navigation link.</param>
internal void WriteNavigationLink(EntityDescriptor entityDescriptor, IEnumerable<LinkDescriptor> relatedLinks, ODataWriterWrapper odataWriter)
{
// TODO: create instance of odatawriter.
// TODO: send clientType once, so that we dont need entity descriptor
Debug.Assert(EntityStates.Added == entityDescriptor.State, "entity not added state");
Dictionary<string, List<LinkDescriptor>> groupRelatedLinks = new Dictionary<string, List<LinkDescriptor>>(EqualityComparer<string>.Default);
foreach (LinkDescriptor end in relatedLinks)
{
List<LinkDescriptor> linkDescriptorsList = null;
if (!groupRelatedLinks.TryGetValue(end.SourceProperty, out linkDescriptorsList))
{
linkDescriptorsList = new List<LinkDescriptor>();
groupRelatedLinks.Add(end.SourceProperty, linkDescriptorsList);
}
linkDescriptorsList.Add(end);
}
ClientTypeAnnotation clientType = null;
foreach (var grlinks in groupRelatedLinks)
{
if (null == clientType)
{
ClientEdmModel model = this.requestInfo.Model;
clientType = model.GetClientTypeAnnotation(model.GetOrCreateEdmType(entityDescriptor.Entity.GetType()));
}
bool isCollection = clientType.GetProperty(grlinks.Key, false).IsEntityCollection;
bool started = false;
foreach (LinkDescriptor end in grlinks.Value)
{
Debug.Assert(!end.ContentGeneratedForSave, "already saved link");
end.ContentGeneratedForSave = true;
Debug.Assert(null != end.Target, "null is DELETE");
ODataNavigationLink navigationLink = new ODataNavigationLink();
navigationLink.Url = this.requestInfo.EntityTracker.GetEntityDescriptor(end.Target).GetLatestEditLink();
Debug.Assert(Uri.IsWellFormedUriString(UriUtil.UriToString(navigationLink.Url), UriKind.Absolute), "Uri.IsWellFormedUriString(targetEditLink, UriKind.Absolute)");
navigationLink.IsCollection = isCollection;
navigationLink.Name = grlinks.Key;
if (!started)
{
odataWriter.WriteNavigationLinksStart(navigationLink);
started = true;
}
odataWriter.WriteNavigationLinkStart(navigationLink, end.Source, end.Target);
odataWriter.WriteEntityReferenceLink(new ODataEntityReferenceLink() { Url = navigationLink.Url }, end.Source, end.Target);
odataWriter.WriteNavigationLinkEnd(navigationLink, end.Source, end.Target);
}
odataWriter.WriteNavigationLinksEnd();
}
}
/// <summary>
/// enumerate the related Modified/Unchanged links for an added item
/// </summary>
/// <param name="entityDescriptor">entity</param>
/// <returns>related links</returns>
/// <remarks>
/// During a non-batch SaveChanges, an Added entity can become an Unchanged entity
/// and should be included in the set of related links for the second Added entity.
/// </remarks>
protected IEnumerable<LinkDescriptor> RelatedLinks(EntityDescriptor entityDescriptor)
{
foreach (LinkDescriptor end in this.RequestInfo.EntityTracker.Links)
{
if (end.Source == entityDescriptor.Entity)
{
if (null != end.Target)
{ // null TargetResource is equivalent to Deleted
EntityDescriptor target = this.RequestInfo.EntityTracker.GetEntityDescriptor(end.Target);
// assumption: the source entity started in the Added state
// note: SaveChanges operates with two passes
// a) first send the request and then attach identity and append the result into a batch response (Example: BeginSaveChanges)
// b) process the batch response (shared code with SaveChanges(BatchWithSingleChangeset)) (Example: EndSaveChanges)
// note: SaveResultWasProcessed is set when to the pre-save state when the save result is sucessfully processed
// scenario #1 when target entity started in modified or unchanged state
// 1) the link target entity was modified and now implicitly assumed to be unchanged (this is true in second pass)
// 2) or link target entity has not been saved is in the modified or unchanged state (this is true in first pass)
// scenario #2 when target entity started in added state
// 1) target entity has an identity (true in first pass for non-batch)
// 2) target entity is processed before source to qualify (1) better during the second pass
// 3) the link target has not been saved and is in the added state
// 4) or the link target has been saved and was in the added state
if (Util.IncludeLinkState(target.SaveResultWasProcessed) || ((0 == target.SaveResultWasProcessed) && Util.IncludeLinkState(target.State)) ||
((null != target.Identity) && (target.ChangeOrder < entityDescriptor.ChangeOrder) &&
((0 == target.SaveResultWasProcessed && EntityStates.Added == target.State) ||
(EntityStates.Added == target.SaveResultWasProcessed))))
{
Debug.Assert(entityDescriptor.ChangeOrder < end.ChangeOrder, "saving is out of order");
yield return end;
}
}
}
}
}
internal bool DetachResource(EntityDescriptor resource)
{
this.EnsureLinkBindings();
// Since we are changing the list on the fly, we need to convert it into a list first
// so that enumeration won't get effected.
foreach (LinkDescriptor end in this.bindings.Values.Where(resource.IsRelatedEntity).ToList())
{
this.DetachExistingLink(
end,
end.Target == resource.Entity && resource.State == EntityStates.Added);
}
resource.ChangeOrder = UInt32.MaxValue;
resource.State = EntityStates.Detached;
bool flag = this.entityDescriptors.Remove(resource.Entity);
Debug.Assert(flag, "should have removed existing entity");
this.DetachResourceIdentity(resource);
return true;
}
/// <summary>
/// Create ODataRequestMessage for the given entity.
/// </summary>
/// <param name="entityDescriptor">resource</param>
/// <returns>An instance of ODataRequestMessage for the given entity.</returns>
protected ODataRequestMessageWrapper CreateRequest(EntityDescriptor entityDescriptor)
{
Debug.Assert(null != entityDescriptor, "null entityDescriptor");
Debug.Assert(entityDescriptor.State == EntityStates.Added || entityDescriptor.State == EntityStates.Deleted || entityDescriptor.State == EntityStates.Modified, "the entity must be in one of the 3 possible states");
EntityStates state = entityDescriptor.State;
Uri requestUri = entityDescriptor.GetResourceUri(this.RequestInfo.BaseUriResolver, false /*queryLink*/);
Debug.Assert(null != requestUri, "request uri is null");
Debug.Assert(requestUri.IsAbsoluteUri, "request uri is not absolute uri");
ClientEdmModel model = this.RequestInfo.Model;
ClientTypeAnnotation clientType = model.GetClientTypeAnnotation(model.GetOrCreateEdmType(entityDescriptor.Entity.GetType()));
Version requestVersion = DetermineRequestVersion(clientType);
string httpMethod = this.GetHttpMethod(state, ref requestVersion);
HeaderCollection headers = new HeaderCollection();
// Set the content type
if (EntityStates.Deleted != entityDescriptor.State)
{
this.RequestInfo.Context.Format.SetRequestContentTypeForEntry(headers);
}
// Set IfMatch (etag) header for update and delete requests
if ((EntityStates.Deleted == state) || (EntityStates.Modified == state))
{
string etag = entityDescriptor.GetLatestETag();
if (etag != null)
{
headers.SetHeader(XmlConstants.HttpRequestIfMatch, etag);
}
}
// Set the prefer header if required
ApplyPreferences(headers, httpMethod, this.RequestInfo.AddAndUpdateResponsePreference, ref requestVersion);
// Set the request DSV and request MDSV headers
headers.SetRequestVersion(requestVersion, this.RequestInfo.MaxProtocolVersionAsVersion);
this.RequestInfo.Format.SetRequestAcceptHeader(headers);
return this.CreateRequestMessage(httpMethod, requestUri, headers, this.RequestInfo.HttpStack, entityDescriptor, this.IsBatchRequest ? entityDescriptor.ChangeOrder.ToString(CultureInfo.InvariantCulture) : null);
}
/// <summary>response materialization has an identity to attach to the inserted object</summary>
/// <param name="entityDescriptorFromMaterializer">entity descriptor containing all the information about the entity from the response.</param>
/// <param name="metadataMergeOption">mergeOption based on which EntityDescriptor will be merged.</param>
internal override void AttachIdentity(EntityDescriptor entityDescriptorFromMaterializer, MergeOption metadataMergeOption)
{ // insert->unchanged
Debug.Assert(entityDescriptorFromMaterializer != null, "entityDescriptorFromMaterializer != null");
this.EnsureIdentityToResource();
// resource.State == EntityState.Added or Unchanged for second pass of media link
EntityDescriptor trackedEntityDescriptor = this.entityDescriptors[entityDescriptorFromMaterializer.Entity];
// make sure we got the right one - server could override identity and we may be tracking another one already.
this.ValidateDuplicateIdentity(entityDescriptorFromMaterializer.Identity, trackedEntityDescriptor);
this.DetachResourceIdentity(trackedEntityDescriptor);
// While processing the response, we need to find out if the given resource was inserted deep
// If it was, then we need to change the link state from added to unchanged
if (trackedEntityDescriptor.IsDeepInsert)
{
LinkDescriptor end = this.bindings[trackedEntityDescriptor.GetRelatedEnd()];
end.State = EntityStates.Unchanged;
}
trackedEntityDescriptor.Identity = entityDescriptorFromMaterializer.Identity; // always attach the identity
AtomMaterializerLog.MergeEntityDescriptorInfo(trackedEntityDescriptor, entityDescriptorFromMaterializer, true /*mergeInfo*/, metadataMergeOption);
trackedEntityDescriptor.State = EntityStates.Unchanged;
trackedEntityDescriptor.PropertiesToSerialize.Clear();
// scenario: sucessfully (1) delete an existing entity and (2) add a new entity where the new entity has the same identity as deleted entity
// where the SaveChanges pass1 will now associate existing identity with new entity
// but pass2 for the deleted entity will not blindly remove the identity that is now associated with the new identity
this.identityToDescriptor[entityDescriptorFromMaterializer.Identity] = trackedEntityDescriptor;
}
/// <summary>
/// Get the server type name - either from the entity descriptor or using the type resolver.
/// </summary>
/// <param name="descriptor">The entity descriptor.</param>
/// <returns>The server type name for the entity.</returns>
internal string GetServerTypeName(EntityDescriptor descriptor)
{
Debug.Assert(descriptor != null && descriptor.Entity != null, "Null descriptor or no entity in descriptor");
string serverTypeName = null;
if (this.HasResolveName)
{
Type entityType = descriptor.Entity.GetType();
if (this.IsUserSuppliedResolver)
{
// User-supplied resolver, must call first
serverTypeName = this.ResolveNameFromType(entityType) ?? descriptor.GetLatestServerTypeName();
}
else
{
// V2+ codegen resolver, called last
serverTypeName = descriptor.GetLatestServerTypeName() ?? this.ResolveNameFromType(entityType);
}
}
else
{
serverTypeName = descriptor.GetLatestServerTypeName();
}
return serverTypeName;
}
/// <summary>
/// Ensure an identity is unique and does not point to another resource
/// </summary>
/// <param name="identity">The identity</param>
/// <param name="descriptor">The entity descriptor</param>
private void ValidateDuplicateIdentity(Uri identity, EntityDescriptor descriptor)
{
EntityDescriptor trackedIdentity;
if (this.identityToDescriptor.TryGetValue(identity, out trackedIdentity) && descriptor != trackedIdentity && trackedIdentity.State != EntityStates.Deleted && trackedIdentity.State != EntityStates.Detached)
{
// we checked the state because we do not remove the deleted/detached entity descriptor from the dictionary until we have finished processing all changes
// So for instance if you delete one entity and add back one with the same ID, they will be a temporary conflict in the dictionary.
throw Error.InvalidOperation(Strings.Context_DifferentEntityAlreadyContained);
}
}
/// <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);
}
