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/**
* Copyright (C) 2015 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 <boost/optional.hpp>
#include <string>
#include "mongo/base/status.h"
#include "mongo/db/json.h"
#include "mongo/db/repl/optime.h"
#include "mongo/util/time_support.h"
namespace mongo {
class BSONObj;
namespace repl {
enum class ReadConcernLevel { kLocalReadConcern, kMajorityReadConcern, kLinearizableReadConcern };
class ReadConcernArgs {
public:
static const std::string kReadConcernFieldName;
static const std::string kAfterOpTimeFieldName;
static const std::string kLevelFieldName;
ReadConcernArgs();
ReadConcernArgs(boost::optional<OpTime> opTime, boost::optional<ReadConcernLevel> level);
/**
* Format:
* {
* find: “coll”,
* filter: <Query Object>,
* readConcern: { // optional
* level: "[majority|local|linearizable]",
* afterOpTime: { ts: <timestamp>, term: <NumberLong> },
* }
* }
*/
Status initialize(const BSONObj& cmdObj) {
return initialize(cmdObj[kReadConcernFieldName]);
}
/**
* Initializes the object from the readConcern element in a command object.
* Use this if you are already iterating over the fields in the command object.
* This method correctly handles missing BSONElements.
*/
Status initialize(const BSONElement& readConcernElem);
/**
* Appends level and afterOpTime.
*/
void appendInfo(BSONObjBuilder* builder) const;
ReadConcernLevel getLevel() const;
OpTime getOpTime() const;
private:
boost::optional<OpTime> _opTime;
boost::optional<ReadConcernLevel> _level;
};
} // namespace repl
} // namespace mongo
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