Examples with DynamoDBMapper com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapper used on opensource projects

Example 6 with DynamoDBMapper

use of com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapper in project gora by apache.

the class DynamoDBNativeStore method delete.

/**
   * Deletes the object using key
   *
   * @param key the key of the object
   * @return true for a successful process
   */
@Override
public boolean delete(K key) {
    try {
        T object = null;
        Object rangeKey = null, hashKey = null;
        DynamoDBMapper mapper = new DynamoDBMapper(dynamoDBStoreHandler.getDynamoDbClient());
        for (Method met : key.getClass().getDeclaredMethods()) {
            if (met.getName().equals(GET_RANGE_KEY_METHOD)) {
                Object[] params = null;
                rangeKey = met.invoke(key, params);
                break;
            }
        }
        for (Method met : key.getClass().getDeclaredMethods()) {
            if (met.getName().equals(GET_HASH_KEY_METHOD)) {
                Object[] params = null;
                hashKey = met.invoke(key, params);
                break;
            }
        }
        if (hashKey == null)
            object = (T) mapper.load(persistentClass, key);
        if (rangeKey == null)
            object = (T) mapper.load(persistentClass, hashKey);
        else
            object = (T) mapper.load(persistentClass, hashKey, rangeKey);
        if (object == null)
            return false;
        // setting key for dynamodbMapper
        mapper.delete(object);
        return true;
    } catch (Exception e) {
        LOG.error("Error while deleting value with key " + key.toString());
        LOG.error(e.getMessage());
        return false;
    }
}

Example 7 with DynamoDBMapper

use of com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapper in project gora by apache.

the class DynamoDBNativeStore method execute.

/**
   * Executes a query after building a DynamoDB specific query based on the
   * received one
   */
@Override
public Result<K, T> execute(Query<K, T> query) {
    DynamoDBQuery<K, T> dynamoDBQuery = buildDynamoDBQuery(query);
    DynamoDBMapper mapper = new DynamoDBMapper(dynamoDBStoreHandler.getDynamoDbClient());
    List<T> objList = null;
    if (DynamoDBQuery.getType().equals(DynamoDBQuery.RANGE_QUERY))
        objList = mapper.scan(persistentClass, (DynamoDBScanExpression) dynamoDBQuery.getQueryExpression());
    if (DynamoDBQuery.getType().equals(DynamoDBQuery.SCAN_QUERY))
        objList = mapper.scan(persistentClass, (DynamoDBScanExpression) dynamoDBQuery.getQueryExpression());
    return new DynamoDBResult<K, T>(this, query, objList);
}