use of software.amazon.awssdk.services.kinesis.model.GetRecordsRequest in project aws-doc-sdk-examples by awsdocs.
the class GetRecords method getStockTrades.
// snippet-start:[kinesis.java2.getrecord.main]
public static void getStockTrades(KinesisClient kinesisClient, String streamName) {
String shardIterator;
String lastShardId = null;
// Retrieve the Shards from a Stream
DescribeStreamRequest describeStreamRequest = DescribeStreamRequest.builder().streamName(streamName).build();
List<Shard> shards = new ArrayList<>();
DescribeStreamResponse streamRes;
do {
streamRes = kinesisClient.describeStream(describeStreamRequest);
shards.addAll(streamRes.streamDescription().shards());
if (shards.size() > 0) {
lastShardId = shards.get(shards.size() - 1).shardId();
}
} while (streamRes.streamDescription().hasMoreShards());
GetShardIteratorRequest itReq = GetShardIteratorRequest.builder().streamName(streamName).shardIteratorType("TRIM_HORIZON").shardId(lastShardId).build();
GetShardIteratorResponse shardIteratorResult = kinesisClient.getShardIterator(itReq);
shardIterator = shardIteratorResult.shardIterator();
// Continuously read data records from shard.
List<Record> records;
// Create new GetRecordsRequest with existing shardIterator.
// Set maximum records to return to 1000.
GetRecordsRequest recordsRequest = GetRecordsRequest.builder().shardIterator(shardIterator).limit(1000).build();
GetRecordsResponse result = kinesisClient.getRecords(recordsRequest);
// Put result into record list. Result may be empty.
records = result.records();
// Print records
for (Record record : records) {
SdkBytes byteBuffer = record.data();
System.out.println(String.format("Seq No: %s - %s", record.sequenceNumber(), new String(byteBuffer.asByteArray())));
}
}
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