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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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 "mongo/db/logical_session_id.h"
#include "mongo/db/operation_context.h"
#include "mongo/util/concurrency/with_lock.h"
#include "mongo/util/decorable.h"
namespace mongo {
/**
* A decorable container for state associated with an active transaction session running on a MongoD
* or MongoS server. Refer to SessionCatalog for more information on the semantics of sessions.
*/
class Session : public Decorable<Session> {
Session(const Session&) = delete;
Session& operator=(const Session&) = delete;
friend class ObservableSession;
friend class SessionCatalog;
public:
explicit Session(LogicalSessionId sessionId) : _sessionId(std::move(sessionId)) {}
~Session() {
invariant(!_numWaitingToCheckOut);
}
const LogicalSessionId& getSessionId() const {
return _sessionId;
}
Session* getParentSession() const {
return _parentSession;
}
private:
// The session id of the transaction session that this object represents.
const LogicalSessionId _sessionId;
// A pointer to the parent Session for this Session if there is one. Set at construction for
// child sessions. Children and parents are reaped atomically, so this pointer should always be
// valid if it is not null.
Session* _parentSession{nullptr};
// Counts how many threads are blocked waiting for this Session to become available. Used to
// block reaping of this Session from the SessionCatalog.
int _numWaitingToCheckOut{0};
};
} // namespace mongo
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