@Override
public List<byte[]> emit(final UnmodifiableBuffer<byte[]> buffer) throws IOException {
// Store the contents of buffer.getRecords because superclass will
// clear the buffer on success
List<byte[]> failed = super.emit(buffer);
// calls S3Emitter to write objects to S3
if (!failed.isEmpty()) {
return buffer.getRecords();
}
String s3File = getS3FileName(buffer.getFirstSequenceNumber(), buffer.getLastSequenceNumber());
// wrap the name of the S3 file as the record data
ByteBuffer data = ByteBuffer.wrap(s3File.getBytes());
// Put the list of file names to the manifest Kinesis stream
PutRecordRequest putRecordRequest = new PutRecordRequest();
putRecordRequest.setData(data);
putRecordRequest.setStreamName(manifestStream);
// Use constant partition key to ensure file order
putRecordRequest.setPartitionKey(manifestStream);
try {
kinesisClient.putRecord(putRecordRequest);
LOG.info("S3ManifestEmitter emitted record downstream: " + s3File);
return Collections.emptyList();
} catch (AmazonServiceException e) {
LOG.error(e);
return buffer.getRecords();
}
}
