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// timer_stats.h
/* Copyright 2012 10gen Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#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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