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// timer_stats.h
/* 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.
*/
#pragma once
#include "mongo/db/jsobj.h"
#include "mongo/util/concurrency/spin_lock.h"
#include "mongo/util/timer.h"
namespace mongo {
/**
* Holds timing information in milliseconds
* keeps track of number of times and total milliseconds
* so a diff can be computed
*/
class TimerStats {
public:
void recordMillis( int millis );
/**
* @return number of millis
*/
int record( const Timer& timer );
BSONObj getReport() const;
operator BSONObj() const { return getReport(); }
private:
mutable SpinLock _lock;
long long _num;
long long _totalMillis;
};
/**
* Holds an instance of a Timer such that we the time is recorded
* when the TimerHolder goes out of scope
*/
class TimerHolder {
public:
/** Destructor will record to TimerStats */
TimerHolder( TimerStats* stats );
/** Will record stats if recordMillis hasn't (based on _recorded) */
~TimerHolder();
/**
* returns elapsed millis from internal timer
*/
int millis() const { return _t.millis(); }
/**
* records the time in the TimerStats and marks that we've
* already recorded so the destructor doesn't
*/
int recordMillis();
private:
TimerStats* _stats;
bool _recorded;
Timer _t;
};
}
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