org/objectweb/proactive/calcium/statistics/Timer.java

/* 
 * ################################################################
 * 
 * ProActive: The Java(TM) library for Parallel, Distributed, 
 *            Concurrent computing with Security and Mobility
 * 
 * Copyright (C) 1997-2007 INRIA/University of Nice-Sophia Antipolis
 * Contact: proactive@objectweb.org
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or any later version.
 *  
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 * USA
 *  
 *  Initial developer(s):               The ProActive Team
 *                        http://www.inria.fr/oasis/ProActive/contacts.html
 *  Contributor(s): 
 * 
 * ################################################################
 */ 
package org.objectweb.proactive.calcium.statistics;

import java.io.Serializable;
import java.lang.management.ManagementFactory;
import java.lang.management.ThreadMXBean;

public class Timer implements Serializable{

        long t, accumulated;
    int numberActivatedTimes;
    boolean cpuTime;
    
    public Timer(boolean useCPUTime){
        cpuTime=useCPUTime;
        reset();
    }
    
    public Timer() {
        this(false);
    }

        public void start() {
                reset();
        }
        
        public long stop(){
                if(t>0)
                accumulated+=getCurrentTime() - t;
                t=-1;
                return accumulated;
        }

        public void resume(){
        t=getCurrentTime();
        numberActivatedTimes++;
    }

    private void reset() {
        t = getCurrentTime();
        accumulated=0;
        numberActivatedTimes=1;
    }
    
    public long getTime(){
        if(t>0) return accumulated + getCurrentTime() - t;
        
        return accumulated;
    }

        public int getNumberOfActivatedTimes() {
                return numberActivatedTimes;
        }
        
        private long getCurrentTime(){
                
                if(!cpuTime) return System.currentTimeMillis();
                
                ThreadMXBean tmb=ManagementFactory.getThreadMXBean();
                if(tmb.isThreadCpuTimeSupported()){
                        
                        if(!tmb.isThreadCpuTimeEnabled()){
                                tmb.setThreadCpuTimeEnabled(true);
                        }
                        return tmb.getCurrentThreadCpuTime()/1000000;
                }

                return System.currentTimeMillis();
        }
}

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