server_status_internal.h

// server_status_internal.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 <map>
#include <string>

#include "mongo/db/jsobj.h"

namespace mongo {

class ServerStatusMetric;

//命令统计信息就是通过该MetricTree管理起来
//ServerStatusMetric::ServerStatusMetric中构造使用  
//db.serverStatus().metrics.commands统计信息就是通过MetricTree管理起来
class MetricTree {
public:
    void add(ServerStatusMetric* metric);

    void appendTo(BSONObjBuilder& b) const;

    static MetricTree* theMetricTree;

private:
    void _add(const std::string& path, ServerStatusMetric* metric);

    std::map<std::string, MetricTree*> _subtrees;
    std::map<std::string, ServerStatusMetric*> _metrics;
};
}