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/**
* Copyright (C) 2017 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>
namespace mongo {
class ServiceContext;
class SessionsCollection;
class OperationContext;
/**
* TransactionReaper is responsible for scanning the transaction table, checking if sessions are
* still alive and deleting the transaction records if their sessions have expired.
*/
class TransactionReaper {
public:
enum class Type {
kReplicaSet,
kSharded,
};
virtual ~TransactionReaper() = 0;
virtual int reap(OperationContext* OperationContext) = 0;
/**
* The implementation of the sessions collections is different in replica sets versus sharded
* clusters, so we have a factory to pick the right impl.
*/
static std::unique_ptr<TransactionReaper> make(Type type,
std::shared_ptr<SessionsCollection> collection);
};
} // namespace mongo
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