Examples with ScanRequest io.cdap.cdap.messaging.store.ScanRequest used on opensource projects

Example 1 with ScanRequest

use of io.cdap.cdap.messaging.store.ScanRequest in project cdap by caskdata.

the class LevelDBMessageTable method scan.

@Override
protected CloseableIterator<RawMessageTableEntry> scan(ScanRequest scanRequest) throws IOException {
    Collection<LevelDBPartition> partitions = partitionManager.getPartitions(scanRequest.getStartTime());
    if (partitions.isEmpty()) {
        return CloseableIterator.empty();
    }
    RawMessageTableEntry tableEntry = new RawMessageTableEntry();
    TopicMetadata topicMetadata = scanRequest.getTopicMetadata();
    byte[] topic = MessagingUtils.toDataKeyPrefix(topicMetadata.getTopicId(), topicMetadata.getGeneration());
    MessageTableKey messageTableKey = MessageTableKey.fromTopic(topic);
    BiFunction<byte[], byte[], RawMessageTableEntry> decodeFunction = (key, value) -> {
        Map<String, byte[]> columns = decodeValue(value);
        messageTableKey.setFromRowKey(key);
        return tableEntry.set(messageTableKey, columns.get(TX_COL), columns.get(PAYLOAD_COL));
    };
    return new PartitionedDBScanIterator<>(partitions.iterator(), scanRequest.getStartRow(), scanRequest.getStopRow(), decodeFunction);
}