/*
* Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017 David Berkman
*
* This file is part of the SmallMind Code Project.
*
* The SmallMind Code Project is free software, you can redistribute
* it and/or modify it under either, at your discretion...
*
* 1) The terms of 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.
*
* ...or...
*
* 2) The terms of the Apache License, Version 2.0.
*
* The SmallMind Code Project 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 or Apache License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* and the Apache License along with the SmallMind Code Project. If not, see
* <http://www.gnu.org/licenses/> or <http://www.apache.org/licenses/LICENSE-2.0>.
*
* Additional permission under the GNU Affero GPL version 3 section 7
* ------------------------------------------------------------------
* If you modify this Program, or any covered work, by linking or
* combining it with other code, such other code is not for that reason
* alone subject to any of the requirements of the GNU Affero GPL
* version 3.
*/
package org.smallmind.seda;
import java.lang.management.ManagementFactory;
import java.lang.management.ThreadMXBean;
public class StopWatch {
private static final ThreadMXBean THREAD_MX_BEAN = ManagementFactory.getThreadMXBean();
private static final boolean CURRENT_THREAD_CPU_TIME_SUPPORTED = THREAD_MX_BEAN.isCurrentThreadCpuTimeSupported();
private boolean initialized = false;
private long startMillis;
private long clickClockMillis;
private long clickClockNanos;
private long durationNanos;
private long clickCPUNanos;
private long cpuTimeNanos;
public StopWatch click () {
if (!initialized) {
initialized = true;
clickClockMillis = System.currentTimeMillis();
clickClockNanos = System.nanoTime();
}
else {
long stopNanos;
startMillis = clickClockMillis;
clickClockMillis = System.currentTimeMillis();
durationNanos = (stopNanos = System.nanoTime()) - clickClockNanos;
clickClockNanos = stopNanos;
if (!CURRENT_THREAD_CPU_TIME_SUPPORTED) {
cpuTimeNanos = durationNanos;
}
else {
long stopCPUNanos;
cpuTimeNanos = (stopCPUNanos = THREAD_MX_BEAN.getCurrentThreadCpuTime()) - clickCPUNanos;
clickCPUNanos = stopCPUNanos;
}
}
return this;
}
public long getStartMillis () {
return startMillis;
}
public long getDurationNanos () {
return durationNanos;
}
public long getCpuTimeNanos () {
return cpuTimeNanos;
}
}