Example usage for com.amazonaws.services.dynamodbv2.document ItemCollection getLastLowLevelResult

Introduction

In this page you can find the example usage for com.amazonaws.services.dynamodbv2.document ItemCollection getLastLowLevelResult.

Prototype

@Override
public R getLastLowLevelResult() 

Source Link

Document

Returns the low-level result last retrieved (for the current page) from the server side; or null if there has yet no calls to the server.

Usage

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

License:Open Source License

private Chunk<Item> getItemListForGsi(String indexName, QuerySpec spec) {
    Preconditions.checkNotNull(spec, "spec must not be null");
    final ItemCollection<QueryOutcome> outcome = table.getIndex(indexName).query(spec);

    List<Item> results = new ArrayList<>();
    try {/*from   w  w w  . j av  a 2 s  . c om*/
        outcome.pages().forEach(p -> {
            p.iterator().forEachRemaining(o -> results.add(o));
        });
    } catch (AmazonServiceException e) {
        throw convertDynamoDBException(e, "getting by spec: " + spec.toString(),
                null /*no write condition exception*/);
    }
    Map<String, AttributeValue> lastEvaluatedKey = outcome.getLastLowLevelResult().getQueryResult()
            .getLastEvaluatedKey();
    String lastEvaluatedItemJson = lastEvaluatedKey == null ? null
            : Item.fromMap(InternalUtils.toSimpleMapValue(lastEvaluatedKey)).toJSON();

    return new ChunkImpl<>(results, lastEvaluatedItemJson, null /*chunkable*/);
}

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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  ww  . ja va2 s.  co  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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