001package org.nuxeo.elasticsearch;/*
002 * (C) Copyright 2016 Nuxeo SA (http://nuxeo.com/) and contributors.
003 *
004 * All rights reserved. This program and the accompanying materials
005 * are made available under the terms of the GNU Lesser General Public License
006 * (LGPL) version 2.1 which accompanies this distribution, and is available at
007 * http://www.gnu.org/licenses/lgpl-2.1.html
008 *
009 * This library is distributed in the hope that it will be useful,
010 * but WITHOUT ANY WARRANTY; without even the implied warranty of
011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 * Lesser General Public License for more details.
013 *
014 * Contributors:
015 *     bdelbosc
016 */
017
018/**
019 * @since 8.3
020 */
021public final class Timestamp {
022    // currentTimeMillis is not accurate especially under windows (15ms granularity)
023    final static long t0 = System.currentTimeMillis() * 1000;
024    // nanoTime is accurate but the value is not a timestamp it dependds on the OS/JVM
025    final static long n0 = System.nanoTime();
026
027    private Timestamp() {
028    }
029
030    /**
031     * Gets an accurate timestamp in micro seconds
032     */
033    public static long currentTimeMicros() {
034        return t0 + (System.nanoTime() - n0) / 1000;
035    }
036}