// timer_stats.cpp

/*    Copyright 2012 10gen Inc.
 *
 *    This program is free software: you can redistribute it and/or  modify
 *    it under the terms of the GNU Affero General Public License, version 3,
 *    as published by the Free Software Foundation.
 *
 *    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 this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the GNU Affero General Public License in all respects
 *    for all of the code used other than as permitted herein. If you modify
 *    file(s) with this exception, you may extend this exception to your
 *    version of the file(s), but you are not obligated to do so. If you do not
 *    wish to do so, delete this exception statement from your version. If you
 *    delete this exception statement from all source files in the program,
 *    then also delete it in the license file.
 */

#include "mongo/db/stats/timer_stats.h"

namespace mongo {

    TimerHolder::TimerHolder( TimerStats* stats )
        : _stats( stats ), _recorded( false ){
    }

    TimerHolder::~TimerHolder() {
        if ( ! _recorded ) {
            recordMillis();
        }
    }

    int TimerHolder::recordMillis() {
        _recorded = true;
        if ( _stats ) {
            return _stats->record( _t );
        }
        return _t.millis();
    }

    void TimerStats::recordMillis( int millis ) {
        scoped_spinlock lk( _lock );
        _num++;
        _totalMillis += millis;
    }

    int TimerStats::record( const Timer& timer ) {
        int millis = timer.millis();
        recordMillis( millis );
        return millis;
    }

    BSONObj TimerStats::getReport() const {
        long long n, t;
        {
            scoped_spinlock lk( _lock );
            n = _num;
            t = _totalMillis;
        }
        BSONObjBuilder b(64);
        b.appendNumber( "num", n );
        b.appendNumber( "totalMillis" , t );
        return b.obj();

    }
}
