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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 <memory>
#include <string>
#include <utility>
#include "mongo/base/disallow_copying.h"
#include "mongo/base/status_with.h"
#include "mongo/bson/bsonobj.h"
#include "mongo/db/record_id.h"
namespace mongo {
namespace repl {
class OplogInterface {
MONGO_DISALLOW_COPYING(OplogInterface);
public:
class Iterator;
OplogInterface() = default;
virtual ~OplogInterface() = default;
/**
* Diagnostic information.
*/
virtual std::string toString() const = 0;
/**
* Produces an iterator over oplog collection in reverse natural order.
*/
virtual std::unique_ptr<Iterator> makeIterator() const = 0;
};
class OplogInterface::Iterator {
MONGO_DISALLOW_COPYING(Iterator);
public:
using Value = std::pair<BSONObj, RecordId>;
Iterator() = default;
virtual ~Iterator() = default;
/**
* Returns next operation and record id (if applicable) in the oplog.
*/
virtual StatusWith<Value> next() = 0;
};
} // namespace repl
} // namespace mongo
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