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// server_status_metric.h
/**
* Copyright (C) 2014 MongoDB 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 <string>
#include "mongo/db/jsobj.h"
namespace mongo {
class ServerStatusMetric {
public:
/**
* @param name is a dotted path of a counter name
* if name starts with . its treated as a path from the serverStatus root
* otherwise it will live under the "counters" namespace
* so foo.bar would be serverStatus().counters.foo.bar
*/
ServerStatusMetric(const std::string& name);
virtual ~ServerStatusMetric() {}
std::string getMetricName() const {
return _name;
}
virtual void appendAtLeaf(BSONObjBuilder& b) const = 0;
protected:
static std::string _parseLeafName(const std::string& name);
const std::string _name;
const std::string _leafName;
};
/**
* usage
*
* declared once
* Counter counter;
* ServerStatusMetricField myAwesomeCounterDisplay( "path.to.counter", &counter );
*
* call
* counter.hit();
*
* will show up in db.serverStatus().metrics.path.to.counter
*/
template <typename T>
class ServerStatusMetricField : public ServerStatusMetric {
public:
ServerStatusMetricField(const std::string& name, const T* t)
: ServerStatusMetric(name), _t(t) {}
const T* get() {
return _t;
}
virtual void appendAtLeaf(BSONObjBuilder& b) const {
b.append(_leafName, *_t);
}
private:
const T* _t;
};
}
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