/* This file is part of VoltDB.
* Copyright (C) 2008-2010 VoltDB L.L.C.
*
* VoltDB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* VoltDB 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with VoltDB. If not, see <http://www.gnu.org/licenses/>.
*/
package org.voltdb.utils;
import java.util.concurrent.atomic.AtomicLong;
/**
* 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 final AtomicLong m_now = new AtomicLong(System.currentTimeMillis());
public static long currentTimeMillis() {
return m_now.get();
}
}