/// <inheritdoc />
public override ISerializer BuildSerializer(
SerializerRepresentation serializerRepresentation,
AssemblyMatchStrategy assemblyMatchStrategy = AssemblyMatchStrategy.AnySingleVersion)
{
if (serializerRepresentation == null)
{
throw new ArgumentNullException(nameof(serializerRepresentation));
}
// ReSharper disable once RedundantArgumentDefaultValue
var configurationType = serializerRepresentation.SerializationConfigType?.ResolveFromLoadedTypes(assemblyMatchStrategy, throwIfCannotResolve: true);
ISerializer serializer;
switch (serializerRepresentation.SerializationKind)
{
case SerializationKind.Bson:
serializer = new ObcBsonSerializer(configurationType?.ToBsonSerializationConfigurationType());
break;
default:
throw new NotSupportedException(Invariant($"{nameof(serializerRepresentation)} from enumeration {nameof(SerializationKind)} of {serializerRepresentation.SerializationKind} is not supported."));
}
var result = this.WrapInCompressingSerializerIfAppropriate(serializer, serializerRepresentation.CompressionKind);
return(result);
}
/// <inheritdoc />
public Type GetActualType(
IBsonReader bsonReader,
Type nominalType)
{
if (bsonReader == null)
{
throw new ArgumentNullException(nameof(bsonReader));
}
if (nominalType == null)
{
throw new ArgumentNullException(nameof(nominalType));
}
var bookmark = bsonReader.GetBookmark();
bsonReader.ReadStartDocument();
Type result;
if (bsonReader.FindElement(this.ElementName))
{
var value = bsonReader.ReadString();
try
{
result = value.ResolveFromLoadedTypes();
if (result == null)
{
throw new InvalidOperationException(Invariant($"'{nameof(result)}' is null"));
}
}
catch (ArgumentException)
{
bsonReader.ReturnToBookmark(bookmark);
// previously persisted documents will have used Type.Name
// in that case ToTypeRepresentationFromAssemblyQualifiedName will throw.
// this is here for backward compatibility.
result = HierarchicalDiscriminatorConvention.GetActualType(bsonReader, nominalType);
if (result == null)
{
throw new InvalidOperationException(Invariant($"Found discriminator '{value}' when deserializing into {nameof(nominalType)} '{nominalType.ToStringReadable()}', but could not get the actual type using {nameof(TypeNameDiscriminator)}.{nameof(TypeNameDiscriminator.GetActualType)}(); it returned null."));
}
}
}
else
{
// if _t is not in the payload then a discriminator wasn't needed
result = nominalType;
}
bsonReader.ReturnToBookmark(bookmark);
// See notes in ThrowOnUnregisteredTypeIfAppropriate for the need to make this call.
// Note that this is a sub-par solution. Ideally this discriminator would know
// which serializer (and hence which serialization configuration) is being used for deserializing,
// because it is passed as a parameter to this method. Because that's not an option in Mongo,
// we have to use ObcBsonSerializer.SerializationConfigurationInUseForDeserialization, which
// tracks the thread being used for the deserialize operation and associates the serialization
// configuration in-use with the thread.
var serializationConfiguration = ObcBsonSerializer.GetSerializationConfigurationInUseForDeserialization();
// serializationConfiguration is only ever null if the consumer is NOT using the front-door for serialization
// (i.e. a serializer), but using the Mongo driver directly to deserialize. In that case, we do not know
// which serialization configuration is "in use".
serializationConfiguration?.ThrowOnUnregisteredTypeIfAppropriate(result, SerializationDirection.Deserialize, null);
return(result);
}