001/*
002 * (C) Copyright 2016 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     bdelbosc
018 */
019package org.nuxeo.elasticsearch;
020
021/**
022 * @since 8.3
023 */
024public final class Timestamp {
025    // currentTimeMillis is not accurate especially under windows (15ms granularity)
026    static final long t0 = System.currentTimeMillis() * 1000;
027
028    // nanoTime is accurate but the value is not a timestamp it dependds on the OS/JVM
029    static final long n0 = System.nanoTime();
030
031    private Timestamp() {
032    }
033
034    /**
035     * Gets an accurate timestamp in micro seconds
036     */
037    public static long currentTimeMicros() {
038        return t0 + (System.nanoTime() - n0) / 1000;
039    }
040}