2 * ===============================LICENSE_START======================================
4 * ================================================================================
5 * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
6 * ================================================================================
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
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18 * ============================LICENSE_END===========================================
21 package org.onap.dcae.apod.analytics.common.utils;
23 import java.util.Date;
26 * Contains Utility methods for creating persistence row keys etc.
28 * @author Rajiv Singla . Creation Date: 11/16/2016.
30 public abstract class PersistenceUtils {
34 * Name of the column which will contain Table Key
36 public static final String TABLE_ROW_KEY_COLUMN_NAME = "key";
39 * Delimited to be used when creating a row key with multiple fields
41 public static final String ROW_KEY_DELIMITER = "-";
44 private PersistenceUtils() {
49 * Creates a decreasing number using current timestamp. Handy when you want to keep records most recent records
50 * close to the top of column table like HBase
52 * @return decreasing number
54 public static String getCurrentTimeReverseSubKey() {
55 final long timeReverseLong = Long.MAX_VALUE - new Date().getTime();
56 return String.format("%025d", timeReverseLong);