/// <summary> /// Writing a delta link. /// </summary> /// <param name="deltaLink">The delta link to write.</param> public abstract void WriteDeltaLink(ODataDeltaLink deltaLink);
/// <summary> /// Asynchronously writing a delta link. /// </summary> /// <param name="deltaLink">The delta link to write.</param> /// <returns>A task instance that represents the asynchronous write operation.</returns> public abstract Task WriteDeltaLinkAsync(ODataDeltaLink deltaLink);
/// <summary>
/// Handle single entry, which from first level and $expand
/// </summary>
/// <param name="entry">Entry</param>
/// <param name="entitySet">EntitySet</param>
/// <param name="targetVersion">Target Version</param>
/// <param name="selectExpandClause">Select and Expand Caluse</param>
/// <param name="parentId">ParentId, string.Empty for first level</param>
/// <param name="relationShip">Navigation property name, string.Empty for first level</param>
private void GenerateDeltaItemFromEntry(object entry, IEdmNavigationSource entitySet, ODataVersion targetVersion, SelectExpandClause selectExpandClause, string parentId, string relationShip)
{
var deltaEntry = ODataObjectModelConverter.ConvertToODataEntry(entry, entitySet, targetVersion);
// Verify entry if need to be written
DateTime lastestUpdated = ((ClrObject)entry).UpdatedTime;
if (lastestUpdated > DeltaSnapshot.TimeStamp)
{
var lastSegmentOfDeltaEntry = new ODataUriParser(this.DataSource.Model, ServiceConstants.ServiceBaseUri, deltaEntry.Id).ParsePath().LastSegment as KeySegment;
deltaEntry.SetSerializationInfo(new ODataFeedAndEntrySerializationInfo
{
NavigationSourceEntityTypeName = lastSegmentOfDeltaEntry.EdmType.ToString(),
NavigationSourceKind = lastSegmentOfDeltaEntry.NavigationSource.NavigationSourceKind(),
NavigationSourceName = lastSegmentOfDeltaEntry.NavigationSource.Name,
});
this.DeltaItems.Add(deltaEntry);
}
// Verify if need added link
bool ifDeleted = DeltaSnapshot.Entries.Remove(DeltaSnapshot.Entries.FirstOrDefault(p => p.Id == deltaEntry.Id.AbsoluteUri && p.ParentId == parentId && p.RelationShip == relationShip));
if ((!string.IsNullOrEmpty(parentId)) && ifDeleted == false)
{
var deltaLink = new ODataDeltaLink(new Uri(parentId), deltaEntry.Id, relationShip);
var lastSegmentOfDeltaEntry = new ODataUriParser(this.DataSource.Model, ServiceConstants.ServiceBaseUri, deltaEntry.Id).ParsePath().LastSegment as KeySegment;
deltaLink.SetSerializationInfo(new ODataDeltaSerializationInfo
{
NavigationSourceName = lastSegmentOfDeltaEntry.NavigationSource.Name,
});
this.DeltaItems.Add(deltaLink);
}
// Handle $expand
var expandedNavigationItems = selectExpandClause == null ? null : selectExpandClause.SelectedItems.OfType<ExpandedNavigationSelectItem>();
GenerateDeltaItemsFromExpand(entry, entitySet, targetVersion, expandedNavigationItems, deltaEntry.Id.AbsoluteUri);
}
public override void Process(IODataRequestMessage requestMessage, IODataResponseMessage responseMessage)
{
var token = HttpUtility.ParseQueryString(RequestUri.Query).Get("$token");
if (string.IsNullOrEmpty(token))
{
deltaToken = "common";
}
else
{
deltaToken = token;
}
if (deltaToken == "common")
{
originalUri = new Uri(ServiceConstants.ServiceBaseUri, "Customers?$expand=Orders");
using (var messageWriter = this.CreateMessageWriter(responseMessage))
{
var entitySet = this.DataSource.Model.FindDeclaredEntitySet("Customers");
var entityType = entitySet.EntityType();
ODataDeltaWriter deltaWriter = messageWriter.CreateODataDeltaWriter(entitySet, entityType);
var deltaFeed = new ODataDeltaFeed();
var deltaEntry = new ODataEntry
{
Id = new Uri(ServiceConstants.ServiceBaseUri, entitySet.Name + "(1)"),
Properties = new[] {new ODataProperty {Name = "FirstName", Value = "GGGG"}}
};
var deletedLink = new ODataDeltaDeletedLink(
new Uri(ServiceConstants.ServiceBaseUri, entitySet.Name + "(1)"), new Uri(ServiceConstants.ServiceBaseUri, "Orders(8)"), "Orders");
var addedLink = new ODataDeltaLink(
new Uri(ServiceConstants.ServiceBaseUri, entitySet.Name + "(1)"), new Uri(ServiceConstants.ServiceBaseUri, "Orders(7)"), "Orders");
var navigationEntry = new ODataEntry
{
Id = new Uri(ServiceConstants.ServiceBaseUri, "Orders(100)"),
TypeName = "Microsoft.Test.OData.Services.ODataWCFService.Order",
Properties = new[]
{
new ODataProperty {Name = "OrderID", Value = 100},
new ODataProperty {Name = "OrderDate", Value = new DateTimeOffset(DateTime.Now)}
}
};
navigationEntry.SetSerializationInfo(new ODataFeedAndEntrySerializationInfo
{
NavigationSourceEntityTypeName = "Microsoft.Test.OData.Services.ODataWCFService.Order",
NavigationSourceKind = EdmNavigationSourceKind.EntitySet,
NavigationSourceName = "Orders"
});
var deletedEntry = new ODataDeltaDeletedEntry(
new Uri(ServiceConstants.ServiceBaseUri, entitySet.Name + "(2)").AbsoluteUri, DeltaDeletedEntryReason.Deleted);
deltaFeed.DeltaLink = new Uri(ServiceConstants.ServiceBaseUri, "$delta?$token=common");
deltaWriter.WriteStart(deltaFeed);
deltaWriter.WriteStart(deltaEntry);
deltaWriter.WriteEnd();
deltaWriter.WriteDeltaDeletedLink(deletedLink);
deltaWriter.WriteDeltaLink(addedLink);
deltaWriter.WriteStart(navigationEntry);
deltaWriter.WriteEnd();
deltaWriter.WriteDeltaDeletedEntry(deletedEntry);
deltaWriter.WriteEnd();
}
}
else if (deltaToken == "containment")
{
originalUri = new Uri(ServiceConstants.ServiceBaseUri, "Accounts(103)/MyPaymentInstruments?$expand=BillingStatements");
using (var messageWriter = this.CreateMessageWriter(responseMessage))
{
var accountsSet = this.DataSource.Model.FindDeclaredEntitySet("Accounts");
var accountType = accountsSet.EntityType();
var myPisNav = accountType.FindProperty("MyPaymentInstruments") as IEdmNavigationProperty;
var piSet = accountsSet.FindNavigationTarget(myPisNav);
var piType = piSet.EntityType();
ODataDeltaWriter deltaWriter = messageWriter.CreateODataDeltaWriter(piSet as IEdmContainedEntitySet, piType);
var deltaFeed = new ODataDeltaFeed();
var deltaEntry = new ODataEntry
{
Id = new Uri(ServiceConstants.ServiceBaseUri, "Accounts(103)/MyPaymentInstruments(103901)"),
Properties = new[] { new ODataProperty { Name = "FriendlyName", Value = "GGGG" } }
};
var deletedEntry = new ODataDeltaDeletedEntry(
new Uri(ServiceConstants.ServiceBaseUri, "Accounts(103)/MyPaymentInstruments(103901)/BillingStatements(103901001)").AbsoluteUri,
DeltaDeletedEntryReason.Deleted);
deletedEntry.SetSerializationInfo(new ODataDeltaSerializationInfo()
{
NavigationSourceName = "Accounts(103)/MyPaymentInstruments(103901)/BillingStatements"
});
var deletedLink = new ODataDeltaDeletedLink(
new Uri(ServiceConstants.ServiceBaseUri, "Accounts(103)/MyPaymentInstruments(103901)"),
new Uri(ServiceConstants.ServiceBaseUri, "Accounts(103)/MyPaymentInstruments(103901)/BillingStatements(103901001)"),
"BillingStatements");
var navigationEntry = new ODataEntry
{
Id = new Uri(ServiceConstants.ServiceBaseUri, "Accounts(103)/MyPaymentInstruments(103901)/BillingStatements(103901005)"),
TypeName = "Microsoft.Test.OData.Services.ODataWCFService.Statement",
Properties = new[]
{
new ODataProperty { Name = "TransactionType", Value = "OnlinePurchase" },
new ODataProperty { Name = "TransactionDescription", Value = "unknown purchase" },
new ODataProperty { Name = "Amount", Value = 32.1 }
}
};
navigationEntry.SetSerializationInfo(new ODataFeedAndEntrySerializationInfo
{
NavigationSourceEntityTypeName = "Microsoft.Test.OData.Services.ODataWCFService.Statement",
NavigationSourceKind = EdmNavigationSourceKind.ContainedEntitySet,
NavigationSourceName = "Accounts(103)/MyPaymentInstruments(103901)/BillingStatements"
});
var addedLink = new ODataDeltaLink(
new Uri(ServiceConstants.ServiceBaseUri, "Accounts(103)/MyPaymentInstruments(103901)"),
new Uri(ServiceConstants.ServiceBaseUri, "Accounts(103)/MyPaymentInstruments(103901)/BillingStatements(103901005)"),
"BillingStatements");
deltaWriter.WriteStart(deltaFeed);
deltaWriter.WriteStart(deltaEntry);
deltaWriter.WriteEnd();
deltaWriter.WriteDeltaDeletedEntry(deletedEntry);
deltaWriter.WriteDeltaDeletedLink(deletedLink);
deltaWriter.WriteStart(navigationEntry);
deltaWriter.WriteEnd();
deltaWriter.WriteDeltaLink(addedLink);
deltaWriter.WriteEnd();
}
}
else if (deltaToken == "derived")
{
originalUri = new Uri(ServiceConstants.ServiceBaseUri, "People?$expand=Microsoft.Test.OData.Services.ODataWCFService.Customer/Orders");
using (var messageWriter = this.CreateMessageWriter(responseMessage))
{
var peopleSet = this.DataSource.Model.FindDeclaredEntitySet("People");
var personType = peopleSet.EntityType();
ODataDeltaWriter deltaWriter = messageWriter.CreateODataDeltaWriter(peopleSet, personType);
var deltaFeed = new ODataDeltaFeed();
var deltaEntry = new ODataEntry
{
Id = new Uri(ServiceConstants.ServiceBaseUri, "People(1)"),
TypeName = "Microsoft.Test.OData.Services.ODataWCFService.Customer",
Properties = new[]
{
new ODataProperty { Name = "City", Value = "GGGG" }
}
};
var addedLink = new ODataDeltaLink(
new Uri(ServiceConstants.ServiceBaseUri, "People(1)"), new Uri(ServiceConstants.ServiceBaseUri, "Orders(7)"), "Orders");
var deletedEntry = new ODataDeltaDeletedEntry(
new Uri(ServiceConstants.ServiceBaseUri, "People(2)").AbsoluteUri,
DeltaDeletedEntryReason.Changed);
var deletedLink = new ODataDeltaDeletedLink(
new Uri(ServiceConstants.ServiceBaseUri, "People(1)"),
new Uri(ServiceConstants.ServiceBaseUri, "Orders(8)"),
"Orders");
var navigationEntry = new ODataEntry
{
Id = new Uri(ServiceConstants.ServiceBaseUri, "Orders(100)"),
TypeName = "Microsoft.Test.OData.Services.ODataWCFService.Order",
Properties = new[]
{
new ODataProperty {Name = "OrderID", Value = 100},
new ODataProperty {Name = "OrderDate", Value = new DateTimeOffset(DateTime.Now)}
}
};
navigationEntry.SetSerializationInfo(new ODataFeedAndEntrySerializationInfo
{
NavigationSourceEntityTypeName = "Microsoft.Test.OData.Services.ODataWCFService.Order",
NavigationSourceKind = EdmNavigationSourceKind.EntitySet,
NavigationSourceName = "Orders"
});
deltaWriter.WriteStart(deltaFeed);
deltaWriter.WriteStart(deltaEntry);
deltaWriter.WriteEnd();
deltaWriter.WriteDeltaDeletedLink(deletedLink);
deltaWriter.WriteDeltaLink(addedLink);
deltaWriter.WriteStart(navigationEntry);
deltaWriter.WriteEnd();
deltaWriter.WriteDeltaDeletedEntry(deletedEntry);
deltaWriter.WriteEnd();
}
}
else if (deltaToken == "expanded")
{
originalUri = new Uri(ServiceConstants.ServiceBaseUri, "Customers?$expand=Orders");
using (var messageWriter = this.CreateMessageWriter(responseMessage))
{
var customerSet = this.DataSource.Model.FindDeclaredEntitySet("Customers");
var orderSet = this.DataSource.Model.FindDeclaredEntitySet("Orders");
var peopleSet = this.DataSource.Model.FindDeclaredEntitySet("People");
var customerType = customerSet.EntityType();
ODataDeltaWriter deltaWriter = messageWriter.CreateODataDeltaWriter(customerSet, customerType);
// Delta feed and entry
var deltaFeed = new ODataDeltaFeed
{
DeltaLink = new Uri(ServiceConstants.ServiceBaseUri, "$delta?$token=expanded")
};
var deltaEntry = new ODataEntry
{
Id = new Uri(ServiceConstants.ServiceBaseUri, customerSet.Name + "(1)"),
Properties = new[] { new ODataProperty { Name = "FirstName", Value = "GGGG" } }
};
// Expanded feed
var navigationLink = new ODataNavigationLink()
{
Name = "Orders",
IsCollection = true,
};
var expandedFeed = new ODataFeed();
var expandedEntry = new ODataEntry
{
Id = new Uri(ServiceConstants.ServiceBaseUri, orderSet.Name + "(8)"),
Properties = new[]
{
new ODataProperty { Name = "OrderDate", Value = new DateTimeOffset(2011, 3, 4, 16, 03, 57, TimeSpan.FromHours(-8)) },
new ODataProperty { Name = "OrderID", Value = 8 },
new ODataProperty { Name = "OrderShelfLifes", Value = new ODataCollectionValue { Items = new[] { new TimeSpan(1) } } },
new ODataProperty { Name = "ShelfLife", Value = new TimeSpan(1) },
new ODataProperty { Name = "ShipDate", Value = new Date(2014, 8, 12) },
new ODataProperty { Name = "ShipTime", Value = new TimeOfDay(6, 5, 30, 0) },
}
};
// Expanded entry
var navigationLinkSingle = new ODataNavigationLink()
{
Name = "Parent",
IsCollection = false,
};
var expandedEntrySingle = new ODataEntry
{
Id = new Uri(ServiceConstants.ServiceBaseUri, peopleSet.Name + "(2)"),
Properties = new[]
{
new ODataProperty { Name = "FirstName", Value = "Jill" },
new ODataProperty { Name = "LastName", Value = "Jones" },
new ODataProperty { Name = "Numbers", Value = new ODataCollectionValue() },
new ODataProperty { Name = "Emails", Value = new ODataCollectionValue() },
new ODataProperty { Name = "PersonID", Value = 2 },
new ODataProperty { Name = "Home", Value = GeographyPoint.Create(15.0, 161.8) },
}
};
// Delta feed and entry
deltaWriter.WriteStart(deltaFeed);
deltaWriter.WriteStart(deltaEntry);
// Expanded feed
deltaWriter.WriteStart(navigationLink);
deltaWriter.WriteStart(expandedFeed);
deltaWriter.WriteStart(expandedEntry);
deltaWriter.WriteEnd();
deltaWriter.WriteEnd();
deltaWriter.WriteEnd();
// Expanded entry
deltaWriter.WriteStart(navigationLinkSingle);
deltaWriter.WriteStart(expandedEntrySingle);
deltaWriter.WriteEnd();
deltaWriter.WriteEnd();
// Delta feed and entry
deltaWriter.WriteEnd();
deltaWriter.WriteEnd();
}
}
else if (deltaToken == "projection")
{
originalUri = new Uri(ServiceConstants.ServiceBaseUri, "Customers?$select=PersonID,FirstName,LastName&$expand=Orders($select=OrderID,OrderDate)");
using (var messageWriter = this.CreateMessageWriter(responseMessage))
{
var entitySet = this.DataSource.Model.FindDeclaredEntitySet("Customers");
var entityType = entitySet.EntityType();
ODataDeltaWriter deltaWriter = messageWriter.CreateODataDeltaWriter(entitySet, entityType);
var deltaFeed = new ODataDeltaFeed();
var deltaEntry1 = new ODataEntry
{
Properties = new[]
{
new ODataProperty { Name = "PersonID", Value = 1 },
new ODataProperty { Name = "FirstName", Value = "FFFF" },
new ODataProperty { Name = "LastName", Value = "LLLL" },
new ODataProperty { Name = "City", Value = "Beijing" }
}
};
var deletedLink = new ODataDeltaDeletedLink(
new Uri(ServiceConstants.ServiceBaseUri, entitySet.Name + "(1)"), new Uri(ServiceConstants.ServiceBaseUri, "Orders(8)"), "Orders");
var addedLink = new ODataDeltaLink(
new Uri(ServiceConstants.ServiceBaseUri, entitySet.Name + "(1)"), new Uri(ServiceConstants.ServiceBaseUri, "Orders(7)"), "Orders");
var navigationEntry = new ODataEntry
{
Id = new Uri(ServiceConstants.ServiceBaseUri, "Orders(100)"),
TypeName = "Microsoft.Test.OData.Services.ODataWCFService.Order",
Properties = new[]
{
new ODataProperty {Name = "OrderID", Value = 100},
new ODataProperty {Name = "OrderDate", Value = new DateTimeOffset(DateTime.Now)}
}
};
navigationEntry.SetSerializationInfo(new ODataFeedAndEntrySerializationInfo
{
NavigationSourceEntityTypeName = "Microsoft.Test.OData.Services.ODataWCFService.Order",
NavigationSourceKind = EdmNavigationSourceKind.EntitySet,
NavigationSourceName = "Orders"
});
var deletedOrderEntry = new ODataDeltaDeletedEntry(
new Uri(ServiceConstants.ServiceBaseUri, "Orders(20)").AbsoluteUri, DeltaDeletedEntryReason.Deleted);
deletedOrderEntry.SetSerializationInfo(new ODataDeltaSerializationInfo()
{
NavigationSourceName = "Orders"
});
var deltaEntry2 = new ODataEntry
{
Properties = new[]
{
new ODataProperty { Name = "PersonID", Value = 2 },
new ODataProperty { Name = "FirstName", Value = "AAAA" },
}
};
deltaWriter.WriteStart(deltaFeed);
deltaWriter.WriteStart(deltaEntry1);
deltaWriter.WriteEnd();
deltaWriter.WriteDeltaDeletedLink(deletedLink);
deltaWriter.WriteDeltaLink(addedLink);
deltaWriter.WriteStart(navigationEntry);
deltaWriter.WriteEnd();
deltaWriter.WriteDeltaDeletedEntry(deletedOrderEntry);
deltaWriter.WriteStart(deltaEntry2);
deltaWriter.WriteEnd();
deltaWriter.WriteEnd();
}
}
}
/// <summary> /// Asynchronously writing a delta link. /// </summary> /// <param name="deltaLink">The delta link to write.</param> /// <returns>A task instance that represents the asynchronous write operation.</returns> public abstract Task WriteDeltaLinkAsync(ODataDeltaLink deltaLink);
/// <summary> /// Writing a delta link. /// </summary> /// <param name="deltaLink">The delta link to write.</param> public abstract void WriteDeltaLink(ODataDeltaLink deltaLink);
/// <summary>
/// Writes the given deltaLink specified by the parameter graph as a part of an existing OData message using the given
/// messageWriter and the writeContext.
/// </summary>
/// <param name="graph">The object to be written.</param>
/// <param name="writer">The <see cref="ODataDeltaWriter" /> to be used for writing.</param>
/// <param name="writeContext">The <see cref="ODataSerializerContext"/>.</param>
public virtual void WriteDeltaLink(object graph, ODataDeltaWriter writer, ODataSerializerContext writeContext)
{
EdmDeltaLink edmDeltaLink = graph as EdmDeltaLink;
if (edmDeltaLink == null)
{
throw new SerializationException(Error.Format(SRResources.CannotWriteType, GetType().Name, graph.GetType().FullName));
}
ODataDeltaLink deltaLink = new ODataDeltaLink(
edmDeltaLink.Source,
edmDeltaLink.Target,
edmDeltaLink.Relationship);
if (deltaLink != null)
{
writer.WriteDeltaLink(deltaLink);
}
}