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// server_parameters.h
/**
* Copyright (C) 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 <string>
#include <map>
#include "mongo/base/status.h"
#include "mongo/db/jsobj.h"
namespace mongo {
class ServerParameterSet;
/**
* Lets you make server level settings easily configurable.
* Hooks into (set|get)Paramter, as well as command line processing
*/
class ServerParameter {
public:
typedef std::map< std::string, ServerParameter* > Map;
ServerParameter( ServerParameterSet* sps, const std::string& name,
bool allowedToChangeAtStartup, bool allowedToChangeAtRuntime );
ServerParameter( ServerParameterSet* sps, const std::string& name );
virtual ~ServerParameter();
std::string name() const { return _name; }
/**
* @return if you can set on command line or config file
*/
bool allowedToChangeAtStartup() const { return _allowedToChangeAtStartup; }
/**
* @param if you can use (get|set)Parameter
*/
bool allowedToChangeAtRuntime() const { return _allowedToChangeAtRuntime; }
virtual void append( BSONObjBuilder& b, const string& name ) = 0;
virtual Status set( const BSONElement& newValueElement ) = 0;
virtual Status setFromString( const string& str ) = 0;
private:
string _name;
bool _allowedToChangeAtStartup;
bool _allowedToChangeAtRuntime;
};
class ServerParameterSet {
public:
typedef std::map< std::string, ServerParameter* > Map;
void add( ServerParameter* sp );
const Map& getMap() const { return _map; }
static ServerParameterSet* getGlobal();
private:
Map _map;
};
/**
* Implementation of ServerParameter for reading and writing a server parameter with a given
* name and type into a specific C++ variable.
*/
template<typename T>
class ExportedServerParameter : public ServerParameter {
public:
/**
* Construct an ExportedServerParameter in parameter set "sps", named "name", whose storage
* is at "value".
*
* If allowedToChangeAtStartup is true, the parameter may be set at the command line,
* e.g. via the --setParameter switch. If allowedToChangeAtRuntime is true, the parameter
* may be set at runtime, e.g. via the setParameter command.
*/
ExportedServerParameter( ServerParameterSet* sps, const std::string& name, T* value,
bool allowedToChangeAtStartup, bool allowedToChangeAtRuntime)
: ServerParameter( sps, name, allowedToChangeAtStartup, allowedToChangeAtRuntime ),
_value( value ) {}
virtual ~ExportedServerParameter() {}
virtual void append( BSONObjBuilder& b, const string& name ) {
b.append( name, *_value );
}
virtual Status set( const BSONElement& newValueElement );
virtual Status set( const T& newValue );
virtual const T& get() const { return *_value; }
virtual Status setFromString( const string& str );
protected:
virtual Status validate( const T& potentialNewValue ){ return Status::OK(); }
T* _value; // owned elsewhere
};
}
#define MONGO_EXPORT_SERVER_PARAMETER_IMPL( NAME, TYPE, INITIAL_VALUE, \
CHANGE_AT_STARTUP, CHANGE_AT_RUNTIME ) \
TYPE NAME = INITIAL_VALUE; \
ExportedServerParameter<TYPE> _##NAME(\
ServerParameterSet::getGlobal(), #NAME, &NAME, CHANGE_AT_STARTUP, CHANGE_AT_RUNTIME )
/**
* Create a global variable of type "TYPE" named "NAME" with the given INITIAL_VALUE. The
* value may be set at startup or at runtime.
*/
#define MONGO_EXPORT_SERVER_PARAMETER( NAME, TYPE, INITIAL_VALUE ) \
MONGO_EXPORT_SERVER_PARAMETER_IMPL( NAME, TYPE, INITIAL_VALUE, true, true )
/**
* Like MONGO_EXPORT_SERVER_PARAMETER, but the value may only be set at startup.
*/
#define MONGO_EXPORT_STARTUP_SERVER_PARAMETER( NAME, TYPE, INITIAL_VALUE ) \
MONGO_EXPORT_SERVER_PARAMETER_IMPL( NAME, TYPE, INITIAL_VALUE, true, false )
/**
* Like MONGO_EXPORT_SERVER_PARAMETER, but the value may only be set at runtime.
*/
#define MONGO_EXPORT_RUNTIME_SERVER_PARAMETER( NAME, TYPE, INITIAL_VALUE ) \
MONGO_EXPORT_SERVER_PARAMETER_IMPL( NAME, TYPE, INITIAL_VALUE, false, true )
#include "server_parameters_inline.h"
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