Example usage for com.amazonaws.services.dynamodbv2.datamodeling DynamoDBScanExpression setLimit

Introduction

In this page you can find the example usage for com.amazonaws.services.dynamodbv2.datamodeling DynamoDBScanExpression setLimit.

Prototype

public void setLimit(Integer limit) 

Source Link

Document

Sets the limit of items to scan during this scan.

Usage

From source file:cf.funge.aworldofplants.model.plant.DDBPlantDAO.java

License:Open Source License

/**
 * Returns a list of plants in the DynamoDB table.
 *
 * @param limit The maximum numbers of results for the scan
 * @return A List of Plant objects//from   w ww .ja va2  s.  c  om
 */
public List<Plant> getPlants(int limit) {
    if (limit <= 0 || limit > DynamoDBConfiguration.SCAN_LIMIT)
        limit = DynamoDBConfiguration.SCAN_LIMIT;

    DynamoDBScanExpression expression = new DynamoDBScanExpression();
    expression.setLimit(limit);
    return getMapper().scan(Plant.class, expression);
}

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From source file:cf.funge.aworldofplants.model.plant.DDBPlantDAO.java

License:Open Source License

public List<Plant> getUserPlants(int limit, String username) {
    if (limit <= 0 || limit > DynamoDBConfiguration.SCAN_LIMIT)
        limit = DynamoDBConfiguration.SCAN_LIMIT;

    Map<String, AttributeValue> eav = new HashMap<>();
    eav.put(":val1", new AttributeValue().withS(username));

    DynamoDBScanExpression expression = new DynamoDBScanExpression().withFilterExpression("username = :val1")
            .withExpressionAttributeValues(eav);
    expression.setLimit(limit);

    List<Plant> scanResult = getMapper().scan(Plant.class, expression);

    return scanResult;
}

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From source file:org.socialsignin.spring.data.dynamodb.repository.support.SimpleDynamoDBPagingAndSortingRepository.java

License:Apache License

@Override
public Page<T> findAll(Pageable pageable) {

    if (pageable.getSort() != null) {
        throw new UnsupportedOperationException("Sorting not supported for find all scan operations");
    }//w  ww .j  a v  a  2  s  .c  o  m

    DynamoDBScanExpression scanExpression = new DynamoDBScanExpression();
    // Scan to the end of the page after the requested page
    int scanTo = pageable.getOffset() + (2 * pageable.getPageSize());
    scanExpression.setLimit(scanTo);
    PaginatedScanList<T> paginatedScanList = dynamoDBOperations.scan(domainType, scanExpression);
    Iterator<T> iterator = paginatedScanList.iterator();
    int processedCount = 0;
    if (pageable.getOffset() > 0) {
        processedCount = scanThroughResults(iterator, pageable.getOffset());
        if (processedCount < pageable.getOffset())
            return new PageImpl<T>(new ArrayList<T>());
    }
    // Scan ahead to retrieve the next page count
    List<T> results = readPageOfResults(iterator, pageable.getPageSize());

    assertScanEnabled(enableScanPermissions.isFindAllPaginatedScanEnabled(), "findAll(Pageable pageable)");
    assertScanCountEnabled(enableScanPermissions.isFindAllUnpaginatedScanCountEnabled(),
            "findAll(Pageable pageable)");

    int totalCount = dynamoDBOperations.count(domainType, scanExpression);

    return new PageImpl<T>(results, pageable, totalCount);

}

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