/* This file is part of VoltDB.
* Copyright (C) 2008-2017 VoltDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with VoltDB. If not, see <http://www.gnu.org/licenses/>.
*/
package org.voltcore.utils;
/**
* A class for retrieving an estimated indication of the current time.
* Very fast since the field is updated less frequently and only updated occasionally.
* Should be cachable by the CPU and the cache will only be invalidated when it is updated.
* Thanks MESI!
*
* CAVEAT The time is not guaranteed to always increase (can move backwards) if there
* are multiple VoltNetwork's present in the process.
*/
public class EstTime {
static volatile long m_now = System.currentTimeMillis();
static {
try {
Class.forName("org.voltcore.utils.EstTimeUpdater");
} catch (Throwable t) {
t.printStackTrace();
}
}
public static long currentTimeMillis() {
return m_now;
}
}