/// <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 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));
}
/// <summary>
/// Builds a serializer for a specific schema.
/// </summary>
/// <param name="subject">
/// The subject of the schema that should be used to serialize data. The latest version of
/// the subject will be resolved.
/// </param>
/// <param name="registerAutomatically">
/// Whether to automatically register a schema that matches <typeparamref name="T" /> if
/// one does not already exist.
/// </param>
/// <exception cref="UnsupportedTypeException">
/// Thrown when the type is incompatible with the retrieved schema or a matching schema
/// cannot be generated.
/// </exception>
public async Task <ISerializer <T> > Build <T>(string subject, bool registerAutomatically = false)
{
try
{
var schema = await RegistryClient.GetLatestSchemaAsync(subject);
return(Build <T>(schema.Id, schema.SchemaString));
}
catch (Exception e) when(registerAutomatically && (
(e is SchemaRegistryException sre && sre.ErrorCode == 40401) ||
(e is UnsupportedTypeException)
))
{
var schema = _schemaBuilder.BuildSchema <T>();
var json = _schemaWriter.Write(schema);
var id = await RegistryClient.RegisterSchemaAsync(subject, json);
return(Build <T>(id, json));
}
}
