/// <summary>
/// Builds a serializer for the Confluent wire format.
/// </summary>
/// <param name="id">
/// A schema ID to include in each serialized payload.
/// </param>
/// <param name="schema">
/// The schema to build the Avro serializer from.
/// </param>
protected virtual Func <T, byte[]> Build(int id, Abstract.Schema schema)
{
var bytes = BitConverter.GetBytes(id);
if (BitConverter.IsLittleEndian)
{
Array.Reverse(bytes);
}
var serialize = SerializerBuilder.BuildDelegate <T>(schema);
return(value =>
{
var stream = new MemoryStream();
using (stream)
{
stream.WriteByte(0x00);
stream.Write(bytes, 0, bytes.Length);
serialize(value, stream);
}
return stream.ToArray();
});
}
/// <summary>
/// Serialize a message. (See <see cref="IAsyncSerializer{T}.SerializeAsync(T, SerializationContext)" />.)
/// </summary>
public virtual async Task <byte[]> SerializeAsync(T data, SerializationContext context)
{
var serialize = await(_cache.GetOrAdd(SubjectNameBuilder(context), async subject =>
{
int id;
Action <T, Stream> @delegate;
try
{
var existing = await _resolve(subject).ConfigureAwait(false);
var schema = SchemaReader.Read(existing.SchemaString);
@delegate = SerializerBuilder.BuildDelegate <T>(schema);
id = existing.Id;
}
catch (Exception e) when(RegisterAutomatically && (
(e is SchemaRegistryException sre && sre.ErrorCode == 40401) ||
(e is AggregateException a && a.InnerExceptions.All(i =>
i is UnsupportedSchemaException ||
i is UnsupportedTypeException
))
))
{
var schema = SchemaBuilder.BuildSchema <T>();
var json = SchemaWriter.Write(schema);
@delegate = SerializerBuilder.BuildDelegate <T>(schema);
id = await _register(subject, json).ConfigureAwait(false);
}
var bytes = BitConverter.GetBytes(id);
if (BitConverter.IsLittleEndian)
{
Array.Reverse(bytes);
}
return(value =>
{
var stream = new MemoryStream();
using (stream)
{
stream.WriteByte(0x00);
stream.Write(bytes, 0, bytes.Length);
@delegate(value, stream);
}
return stream.ToArray();
});
})).ConfigureAwait(false);
return(serialize(data));
}
