Example usage for com.amazonaws.services.dynamodbv2.document.spec ScanSpec withMaxPageSize

Introduction

In this page you can find the example usage for com.amazonaws.services.dynamodbv2.document.spec ScanSpec withMaxPageSize.

Prototype

@Override
    public ScanSpec withMaxPageSize(int maxPageSize) 

Source Link

Usage

From source file:jp.classmethod.aws.dynamodb.DynamoDbRepository.java

License:Open Source License

@Override
public Chunk<E> findAll(Chunkable chunkable) {
    Preconditions.checkNotNull(chunkable);
    Preconditions.checkArgument(Sort.Direction.DESC != chunkable.getDirection(),
            "DynamoDB only supports scanning forwards");
    ScanSpec spec = new ScanSpec();
    if (false == Strings.isNullOrEmpty(chunkable.getPaginationToken())) {
        spec.withExclusiveStartKey(new PrimaryKey(hashKeyName, chunkable.getPaginationToken()));
    }/*from w  w  w .ja  v  a  2s  .  c o m*/
    spec.withMaxPageSize(chunkable.getMaxPageSize()).withMaxResultSize(chunkable.getMaxPageSize());

    final ItemCollection<ScanOutcome> results = table.scan(spec);

    final List<Item> itemList;
    try {
        itemList = Lists.newArrayList(results.iterator());
    } catch (AmazonClientException e) {
        throw convertDynamoDBException(e, "scan", null /* conditionMessage */);
    }
    final List<E> entities = itemList.stream().map(this::convertItemToDomain) //O(n)
            .collect(Collectors.toList()); //O(n)
    final Map<String, AttributeValue> lastEvaluatedKey = results.getLastLowLevelResult() == null ? null
            : results.getLastLowLevelResult().getScanResult().getLastEvaluatedKey();
    final String paginationToken = lastEvaluatedKey == null ? null : lastEvaluatedKey.get(hashKeyName).getS();
    return new ChunkImpl<>(entities, paginationToken, chunkable);
}

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