private String getShardItertor() {
// either return a cached one or get a new one via a GetShardIterator request.
if (currentShardIterator == null) {
String shardId;
// If ShardId supplied use it, else choose first one
if (!getEndpoint().getShardId().isEmpty()) {
shardId = getEndpoint().getShardId();
} else {
DescribeStreamRequest req1 =
new DescribeStreamRequest().withStreamName(getEndpoint().getStreamName());
DescribeStreamResult res1 = getClient().describeStream(req1);
shardId = res1.getStreamDescription().getShards().get(0).getShardId();
}
LOG.debug("ShardId is: {}", shardId);
GetShardIteratorRequest req =
new GetShardIteratorRequest()
.withStreamName(getEndpoint().getStreamName())
.withShardId(shardId)
.withShardIteratorType(getEndpoint().getIteratorType());
if (hasSequenceNumber()) {
req.withStartingSequenceNumber(getEndpoint().getSequenceNumber());
}
GetShardIteratorResult result = getClient().getShardIterator(req);
currentShardIterator = result.getShardIterator();
}
LOG.debug("Shard Iterator is: {}", currentShardIterator);
return currentShardIterator;
}
@JsonIgnore
public boolean setupStream(AmazonKinesis kinesis, String streamName) {
boolean setup = false;
Preconditions.checkState(!Strings.isNullOrEmpty(streamName), "streamName was not specified");
try {
DescribeStreamResult result;
if (getRetryPeriod() != null) {
Integer retryAttempts = getMaxAttempts();
while (retryAttempts == null || retryAttempts > 0) {
try {
result = kinesis.describeStream(streamName);
if ("active".equalsIgnoreCase(result.getStreamDescription().getStreamStatus())) {
LOG.info("stream {} is active", streamName);
setup = true;
break;
}
} catch (NullPointerException | ResourceNotFoundException e) {
createStream(kinesis, streamName);
}
Thread.sleep(retryPeriod.toMilliseconds());
if (retryAttempts != null) {
retryAttempts--;
}
}
}
} catch (InterruptedException e) {
LOG.error(
"Needed to create stream {} but was interrupted, nothing is guaranteed now", streamName);
}
return setup;
}
/**
* Get the available shards from the kinesis
*
* @param streamName Name of the stream from where the shards to be accessed
* @return the list of shards from the given stream
*/
public List<Shard> getShardList(String streamName) {
assert client != null : "Illegal client";
DescribeStreamRequest describeRequest = new DescribeStreamRequest();
describeRequest.setStreamName(streamName);
DescribeStreamResult describeResponse = client.describeStream(describeRequest);
return describeResponse.getStreamDescription().getShards();
}