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// service_stats.h
/**
* Copyright (C) 2010 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.
*/
#ifndef DB_STATS_SERVICE_STATS_HEADER
#define DB_STATS_SERVICE_STATS_HEADER
#include <string>
#include "mongo/util/concurrency/spin_lock.h"
namespace mongo {
using std::string;
class Histogram;
/**
* ServiceStats keeps track of the time a request/response message
* took inside a service as well as the size of the response
* generated.
*/
class ServiceStats {
public:
ServiceStats();
~ServiceStats();
/**
* Record the 'duration' in microseconds a request/response
* message took and the size in bytes of the generated
* response.
*/
void logResponse( uint64_t duration, uint64_t bytes );
/**
* Render the histogram as std::string that can be used inside an
* HTML doc.
*/
std::string toHTML() const;
private:
SpinLock _spinLock; // protects state below
Histogram* _timeHistogram;
Histogram* _spaceHistogram;
ServiceStats( const ServiceStats& );
ServiceStats operator=( const ServiceStats& );
};
} // namespace mongo
#endif // DB_STATS_SERVICE_STATS_HEADER
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