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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 <wiredtiger.h>
#include "mongo/db/operation_context.h"
#include "mongo/db/storage/wiredtiger/wiredtiger_recovery_unit.h"
#include "mongo/db/storage/wiredtiger/wiredtiger_session_cache.h"
namespace mongo {
/**
* This is an object wrapper for WT_CURSOR. It obtains a cursor from the WiredTigerSession and is
* responsible for returning or closing the cursor when destructed.
*/
class WiredTigerCursor {
public:
/**
* If 'allowOverwrite' is true, insert operations will not return an error if the record
* already exists, and update/remove operations will not return error if the record does not
* exist.
*/
WiredTigerCursor(const std::string& uri,
uint64_t tableID,
bool allowOverwrite,
OperationContext* opCtx);
~WiredTigerCursor();
WT_CURSOR* get() const {
return _cursor;
}
WT_CURSOR* operator->() const {
return get();
}
WiredTigerSession* getSession() {
return _session;
}
void reset();
void assertInActiveTxn() const {
_ru->assertInActiveTxn();
}
/**
* Returns the checkpoint ID for checkpoint cursors, otherwise 0.
*/
uint64_t getCheckpointId() const {
return _cursor->checkpoint_id(_cursor);
}
protected:
uint64_t _tableID;
WiredTigerRecoveryUnit* _ru;
WiredTigerSession* _session;
std::string _config;
bool _isCheckpoint;
WT_CURSOR* _cursor = nullptr; // Owned
};
/**
* An owning object wrapper for a WT_SESSION and WT_CURSOR configured for bulk loading when
* possible. The cursor is created and closed independently of the cursor cache, which does not
* store bulk cursors. It uses its own session to avoid hijacking an existing transaction in the
* current session.
*/
class WiredTigerBulkLoadCursor {
public:
WiredTigerBulkLoadCursor(const std::string& indexUri, OperationContext* opCtx);
~WiredTigerBulkLoadCursor() {
_cursor->close(_cursor);
}
WT_CURSOR* get() const {
return _cursor;
}
WT_CURSOR* operator->() const {
return get();
}
private:
UniqueWiredTigerSession const _session;
WT_CURSOR* _cursor = nullptr; // Owned
};
} // namespace mongo
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