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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 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)) {}
/**
* The logical session id that this object represents.
*/
const LogicalSessionId& getSessionId() const {
return _sessionId;
}
OperationContext* currentOperation_forTest() const {
return _checkoutOpCtx;
}
private:
// The id of the session with which this object is associated
const LogicalSessionId _sessionId;
// A pointer back to the currently running operation on this Session, or nullptr if there
// is no operation currently running for the Session.
//
// This field is only safe to read or write while holding the SessionCatalog::_mutex. In
// practice, it is only used inside of the SessionCatalog itself.
OperationContext* _checkoutOpCtx{nullptr};
// Keeps the last time this session was checked-out
Date_t _lastCheckout{Date_t::now()};
// Counter indicating the number of times ObservableSession::kill has been called on this
// session, which have not yet had a corresponding call to checkOutSessionForKill.
int _killsRequested{0};
};
} // namespace mongo
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