Examples with VersionedSchema com.linkedin.databus2.schemas.VersionedSchema used on opensource projects

Example 16 with VersionedSchema

use of com.linkedin.databus2.schemas.VersionedSchema in project databus by linkedin.

the class DbusEventAvroDecoder method dumpEventValueInJSON.

public void dumpEventValueInJSON(DbusEvent e, OutputStream out) {
    byte[] md5 = new byte[16];
    e.schemaId(md5);
    SchemaId schemaId = new SchemaId(md5);
    VersionedSchema sourceSchema = _schemaSet.getById(schemaId);
    ByteBuffer valueBuffer = e.value();
    byte[] valueBytes = new byte[valueBuffer.remaining()];
    valueBuffer.get(valueBytes);
    try {
        Schema schema = sourceSchema.getSchema();
        DatumReader<Object> reader = new GenericDatumReader<Object>(schema);
        binDecoder.set(DecoderFactory.defaultFactory().createBinaryDecoder(valueBytes, binDecoder.get()));
        Object datum = reader.read(null, binDecoder.get());
        DatumWriter<Object> writer = new GenericDatumWriter<Object>(schema);
        JsonGenerator g = new JsonFactory().createJsonGenerator(out, JsonEncoding.UTF8);
        // write the src ID
        g.writeStartObject();
        g.writeFieldName(SRC_ID_FIELD_NAME);
        g.writeNumber(e.getSourceId());
        g.writeFieldName(OPCODE_FIELD_NAME);
        g.writeString(e.getOpcode().toString());
        g.writeFieldName("partId");
        g.writeNumber(Integer.valueOf(e.getPartitionId()));
        g.writeFieldName(VALUE_FIELD_NAME);
        writer.write(datum, new JsonEncoder(schema, g));
        g.writeEndObject();
        g.writeEndObject();
        try {
            g.writeEndObject();
        } catch (JsonGenerationException e_json) {
        // ignore the error as some how avro JsonEncoder may some times missing two }
        }
        g.flush();
    } catch (IOException e1) {
        LOG.error("event value serialization error; event = " + e, e1);
    }
}

Example 17 with VersionedSchema

use of com.linkedin.databus2.schemas.VersionedSchema in project databus by linkedin.

the class DbusEventAvroDecoder method getMetadataSchema.

/**
   * Returns the single version of the metadata schema specified in the given event's header.
   * For INTERNAL USE ONLY (by Espresso and Databus).  This is not a stable API and may change
   * without warning!
   *
   * @param e DbusEvent
   * @return {AvroSchema, "metadata-source", version} tuple for given event 'e' with
   *         metadata-schema-id; null if event contains no metadata
   * @throws DatabusRuntimeException if event contains metadata but schema to decode it is missing
   */
public VersionedSchema getMetadataSchema(DbusEvent e) {
    DbusEventPart metadataPart = e.getPayloadMetadataPart();
    if (null == metadataPart) {
        LOG.debug("No metadata for event " + e);
        return null;
    }
    VersionedSchema schema = getMetadataSchema(metadataPart);
    if (null == schema) {
        throw new DatabusRuntimeException("No schema available to decode metadata for event " + e);
    }
    return schema;
}