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/**
* Copyright (C) 2014 10gen 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 <set>
#include "mongo/db/storage/record_store.h"
#include "mongo/db/storage/mmap_v1/record_store_v1_base.h"
namespace mongo {
/**
* This iterator will go over the collection twice - once going forward (first extent -> last
* extent) and once backwards in an attempt to salvage potentially corrupted or unreachable
* records. It is used by the mongodump --repair option.
*/
class RecordStoreV1RepairIterator : public RecordIterator {
public:
RecordStoreV1RepairIterator(OperationContext* txn,
const RecordStoreV1Base* recordStore);
virtual ~RecordStoreV1RepairIterator() { }
virtual bool isEOF();
virtual DiskLoc getNext();
virtual DiskLoc curr();
virtual void invalidate(const DiskLoc& dl);
virtual void prepareToYield() { }
virtual bool recoverFromYield() {
return true;
}
virtual RecordData dataFor( const DiskLoc& loc ) const;
private:
/**
* Based on the direction of scan, finds the next valid (un-corrupted) extent in the chain
* and sets _currExtent to point to that.
*
* @return true if valid extent was found (_currExtent will not be null)
* false otherwise and _currExtent will be null
*/
bool _advanceToNextValidExtent();
// transactional context for read locks. Not owned by us
OperationContext* _txn;
// Reference to the owning RecordStore. The store must not be deleted while there are
// active iterators on it.
//
const RecordStoreV1Base* _recordStore;
DiskLoc _currExtent;
DiskLoc _currRecord;
enum Stage {
FORWARD_SCAN = 0,
BACKWARD_SCAN = 1,
DONE = 2
};
Stage _stage;
// Used to find cycles within an extent. Cleared after each extent has been processed.
//
std::set<DiskLoc> _seenInCurrentExtent;
};
} // namespace mongo
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