Vincenz Priesnitz created AVRO-1330:
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Summary: java: allow custom Encodings with annotations
Key: AVRO-1330
URL: https://issues.apache.org/jira/browse/AVRO-1330
Project: Avro
Issue Type: New Feature
Components: java
Reporter: Vincenz Priesnitz
Priority: Minor
I propose an annotation @AvroEncode that allows one to encode a java field or a
class directly. The motivation behind this is that some classes are impossible
to serialize due to transient fields or result in a verbose encoding. For
example, java.util.Date cannot be serialized as of now.
The annotation would specify an implementation of an abstract
serializer/deserializer class, which reads and writes directly from the
encoder/decoder.
It would also insert the encodings schema into the surrounding schema.
The annotation would look like this:
{code}
@AvroEncode(using=DateToUtcMillisecondsSerDe)
Date date;
{code}
{code}
public class DateToUtcMillisecondsSerDe extends CustomSerDe<Date> {
{
schema = Schema.create(Schema.Type.LONG);
}
@Override
void write(Date datum, Encoder out) throws IOException {
out.writeLong(datum.getTime());
}
@Override
void read(Date datum, Decoder in) throws IOException {
datum.setTime(in.readLong());
}
}
{code}
As a proof of concept, i implemented such a serDe for java.util.Date.
this would solve avro-739 by delivering one or several default formats for
Date, which can be Overridden to any representation by implemeting a different
SerDe.
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