Example usage for com.amazonaws.services.dynamodbv2.model GetShardIteratorResult getShardIterator

Introduction

In this page you can find the example usage for com.amazonaws.services.dynamodbv2.model GetShardIteratorResult getShardIterator.

Prototype

public String getShardIterator() 

Source Link

Document

The position in the shard from which to start reading stream records sequentially.

Usage

From source file:reactive.dynamo.StreamClient.java

License:Open Source License

public static void main(String args[]) throws InterruptedException {

    streamsClient.setEndpoint("http://localhost:8000");
    //      streamsClient.setEndpoint("streams.dynamodb.eu-west-1.amazonaws.com");

    String myStreamArn = "arn:aws:dynamodb:ddblocal:000000000000:table/TestTableForStreams/stream/2016-11-05T12:23:25.246";

    // Get the shards in the stream

    DescribeStreamResult describeStreamResult = streamsClient
            .describeStream(new DescribeStreamRequest().withStreamArn(myStreamArn));
    String streamArn = describeStreamResult.getStreamDescription().getStreamArn();
    List<Shard> shards = describeStreamResult.getStreamDescription().getShards();
    System.out.println("found shards " + shards.size());
    // Process each shard
    int numChanges = 2;
    for (Shard shard : shards) {
        String shardId = shard.getShardId();
        System.out.println("Processing " + shardId + " from stream " + streamArn + " with parent "
                + shard.getParentShardId());

        // Get an iterator for the current shard

        GetShardIteratorRequest getShardIteratorRequest = new GetShardIteratorRequest()
                .withStreamArn(myStreamArn).withShardId(shardId)
                .withShardIteratorType(ShardIteratorType.TRIM_HORIZON);
        GetShardIteratorResult getShardIteratorResult = streamsClient.getShardIterator(getShardIteratorRequest);
        String nextItr = getShardIteratorResult.getShardIterator();

        while (nextItr != null) {
            //         while (nextItr != null && numChanges > 0) {

            // Use the iterator to read the data records from the shard

            GetRecordsResult getRecordsResult = streamsClient
                    .getRecords(new GetRecordsRequest().withShardIterator(nextItr));
            List<Record> records = getRecordsResult.getRecords();
            System.out.println("Getting records...");
            if (records.isEmpty()) {
                Thread.sleep(2000);
            }//w w w .ja  v  a 2 s  . c  o m
            for (Record record : records) {
                System.out.println(record);
                numChanges--;
            }
            nextItr = getRecordsResult.getNextShardIterator();
        }

        System.out.println("Demo complete");
    }
}

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