Examples with ShardIteratorType com.amazonaws.services.dynamodbv2.model.ShardIteratorType used on opensource projects

Example 1 with ShardIteratorType

use of com.amazonaws.services.dynamodbv2.model.ShardIteratorType in project camel by apache.

the class ShardIteratorHandler method getShardIterator.

String getShardIterator(String resumeFromSequenceNumber) {
    ShardIteratorType iteratorType = getEndpoint().getIteratorType();
    String sequenceNumber = getEndpoint().getSequenceNumber();
    if (resumeFromSequenceNumber != null) {
        // Reset things as we're in an error condition.
        currentShard = null;
        currentShardIterator = null;
        iteratorType = ShardIteratorType.AFTER_SEQUENCE_NUMBER;
        sequenceNumber = resumeFromSequenceNumber;
    }
    // either return a cached one or get a new one via a GetShardIterator request.
    if (currentShardIterator == null) {
        ListStreamsResult streamsListResult = getClient().listStreams(new ListStreamsRequest().withTableName(getEndpoint().getTableName()));
        // XXX assumes there is only one stream
        final String streamArn = streamsListResult.getStreams().get(0).getStreamArn();
        DescribeStreamResult streamDescriptionResult = getClient().describeStream(new DescribeStreamRequest().withStreamArn(streamArn));
        shardList.addAll(streamDescriptionResult.getStreamDescription().getShards());
        LOG.trace("Current shard is: {} (in {})", currentShard, shardList);
        if (currentShard == null) {
            currentShard = resolveNewShard(iteratorType, resumeFromSequenceNumber);
        } else {
            currentShard = shardList.nextAfter(currentShard);
        }
        shardList.removeOlderThan(currentShard);
        LOG.trace("Next shard is: {} (in {})", currentShard, shardList);
        GetShardIteratorResult result = getClient().getShardIterator(buildGetShardIteratorRequest(streamArn, iteratorType, sequenceNumber));
        currentShardIterator = result.getShardIterator();
    }
    LOG.trace("Shard Iterator is: {}", currentShardIterator);
    return currentShardIterator;
}