internal static object ResolveValueSerializer(Type valueType, string specifiedAvroSchema)
{
if (typeof(Google.Protobuf.IMessage).IsAssignableFrom(valueType))
{
return(Activator.CreateInstance(typeof(ProtobufSerializer <>).MakeGenericType(valueType)));
}
var isSpecificRecord = typeof(ISpecificRecord).IsAssignableFrom(valueType);
if (isSpecificRecord || typeof(GenericRecord).IsAssignableFrom(valueType))
{
if (string.IsNullOrWhiteSpace(specifiedAvroSchema))
{
if (!isSpecificRecord)
{
throw new ArgumentNullException(nameof(specifiedAvroSchema), $@"parameter is required when creating an generic avro serializer");
}
specifiedAvroSchema = ((ISpecificRecord)Activator.CreateInstance(valueType)).Schema.ToString();
}
var schemaRegistry = new LocalSchemaRegistry(specifiedAvroSchema);
return(Activator.CreateInstance(typeof(AvroSerializer <>).MakeGenericType(valueType), schemaRegistry, null /* config */));
}
return(null);
}
internal static object ResolveValueDeserializer(Type valueType, string specifiedAvroSchema)
{
if (typeof(Google.Protobuf.IMessage).IsAssignableFrom(valueType))
{
return(Activator.CreateInstance(typeof(ProtobufDeserializer <>).MakeGenericType(valueType)));
}
var isSpecificRecord = typeof(ISpecificRecord).IsAssignableFrom(valueType);
if (isSpecificRecord || typeof(GenericRecord).IsAssignableFrom(valueType))
{
if (string.IsNullOrWhiteSpace(specifiedAvroSchema))
{
if (!isSpecificRecord)
{
throw new ArgumentNullException(nameof(specifiedAvroSchema), $@"parameter is required when creating an generic avro deserializer");
}
specifiedAvroSchema = ((ISpecificRecord)Activator.CreateInstance(valueType)).Schema.ToString();
}
var methodInfo = typeof(SerializationHelper).GetMethod(nameof(CreateAvroDeserializer), BindingFlags.Static | BindingFlags.NonPublic);
var genericMethod = methodInfo.MakeGenericMethod(valueType);
var schemaRegistry = new LocalSchemaRegistry(specifiedAvroSchema);
return(genericMethod.Invoke(null, new object[] { schemaRegistry }));
}
return(null);
}
public override Task StartAsync(CancellationToken cancellationToken)
{
var schemaRegistry = new LocalSchemaRegistry(avroSchema);
AvroDeserializer <TValue> avroDeserializer = new AvroDeserializer <TValue>(schemaRegistry);
SetConsumerAndExecutor(avroDeserializer, null, null);
return(Task.CompletedTask);
}
public KafkaProducer(
ProducerConfig config,
string avroSchema,
ILogger logger)
{
this.logger = logger;
var builder = new ProducerBuilder <TKey, TValue>(config);
IAsyncSerializer <TValue> asyncValueSerializer = null;
ISerializer <TValue> valueSerializer = null;
IAsyncSerializer <TKey> keySerializer = null;
if (!string.IsNullOrEmpty(avroSchema))
{
var schemaRegistry = new LocalSchemaRegistry(avroSchema);
asyncValueSerializer = new AvroSerializer <TValue>(schemaRegistry);
}
else
{
if (typeof(Google.Protobuf.IMessage).IsAssignableFrom(typeof(TValue)))
{
// protobuf: need to create using reflection due to generic requirements in ProtobufSerializer
valueSerializer = (ISerializer <TValue>)Activator.CreateInstance(typeof(ProtobufSerializer <>).MakeGenericType(typeof(TValue)));
}
}
if (asyncValueSerializer != null)
{
builder.SetValueSerializer(asyncValueSerializer);
}
else if (valueSerializer != null)
{
builder.SetValueSerializer(valueSerializer);
}
if (keySerializer != null)
{
builder.SetKeySerializer(keySerializer);
}
this.producer = builder.Build();
}