/**
* Get the records from the particular shard
*
* @param streamName Name of the stream from where the records to be accessed
* @param recordsLimit Number of records to return from shard
* @param shId Shard Id of the shard
* @param iteratorType Shard iterator type
* @param seqNo Record sequence number
* @return the list of records from the given shard
* @throws AmazonClientException
*/
public List<Record> getRecords(
String streamName,
Integer recordsLimit,
String shId,
ShardIteratorType iteratorType,
String seqNo)
throws AmazonClientException {
assert client != null : "Illegal client";
try {
// Create the GetShardIteratorRequest instance and sets streamName, shardId and iteratorType
// to it
GetShardIteratorRequest iteratorRequest = new GetShardIteratorRequest();
iteratorRequest.setStreamName(streamName);
iteratorRequest.setShardId(shId);
iteratorRequest.setShardIteratorType(iteratorType);
// If the iteratorType is AFTER_SEQUENCE_NUMBER, set the sequence No to the iteratorRequest
if (ShardIteratorType.AFTER_SEQUENCE_NUMBER.equals(iteratorType)
|| ShardIteratorType.AT_SEQUENCE_NUMBER.equals(iteratorType))
iteratorRequest.setStartingSequenceNumber(seqNo);
// Get the Response from the getShardIterator service method & get the shardIterator from that
// response
GetShardIteratorResult iteratorResponse = client.getShardIterator(iteratorRequest);
// getShardIterator() specifies the position in the shard
String iterator = iteratorResponse.getShardIterator();
// Create the GetRecordsRequest instance and set the recordsLimit and iterator
GetRecordsRequest getRequest = new GetRecordsRequest();
getRequest.setLimit(recordsLimit);
getRequest.setShardIterator(iterator);
// Get the Response from the getRecords service method and get the data records from that
// response.
GetRecordsResult getResponse = client.getRecords(getRequest);
return getResponse.getRecords();
} catch (AmazonClientException e) {
throw new RuntimeException(e);
}
}
