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// record_store_v1_capped.h
/**
* Copyright (C) 2013 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 "mongo/base/owned_pointer_vector.h"
#include "mongo/db/storage/capped_callback.h"
#include "mongo/db/storage/mmap_v1/diskloc.h"
#include "mongo/db/storage/mmap_v1/extent_manager.h"
#include "mongo/db/storage/mmap_v1/record_store_v1_base.h"
namespace mongo {
class CappedRecordStoreV1 final : public RecordStoreV1Base {
public:
CappedRecordStoreV1(OperationContext* opCtx,
CappedCallback* collection,
StringData ns,
RecordStoreV1MetaData* details,
ExtentManager* em,
bool isSystemIndexes);
~CappedRecordStoreV1() final;
const char* name() const final {
return "CappedRecordStoreV1";
}
Status truncate(OperationContext* opCtx) final;
/**
* Truncate documents newer than the document at 'end' from the capped
* collection. The collection cannot be completely emptied using this
* function. An assertion will be thrown if that is attempted.
* @param inclusive - Truncate 'end' as well iff true
*/
void cappedTruncateAfter(OperationContext* opCtx, RecordId end, bool inclusive) final;
std::unique_ptr<SeekableRecordCursor> getCursor(OperationContext* opCtx,
bool forward) const final;
std::vector<std::unique_ptr<RecordCursor>> getManyCursors(OperationContext* opCtx) const final;
// Start from firstExtent by default.
DiskLoc firstRecord(OperationContext* opCtx, const DiskLoc& startExtent = DiskLoc()) const;
// Start from lastExtent by default.
DiskLoc lastRecord(OperationContext* opCtx, const DiskLoc& startExtent = DiskLoc()) const;
protected:
bool isCapped() const final {
return true;
}
bool shouldPadInserts() const final {
return false;
}
void setCappedCallback(CappedCallback* cb) final {
_cappedCallback = cb;
}
StatusWith<DiskLoc> allocRecord(OperationContext* opCtx,
int lengthWithHeaders,
bool enforceQuota) final;
void addDeletedRec(OperationContext* opCtx, const DiskLoc& dloc) final;
private:
// -- start copy from cap.cpp --
void _compact(OperationContext* opCtx);
DiskLoc cappedFirstDeletedInCurExtent() const;
void setFirstDeletedInCurExtent(OperationContext* opCtx, const DiskLoc& loc);
void cappedCheckMigrate(OperationContext* opCtx);
DiskLoc __capAlloc(OperationContext* opCtx, int len);
bool inCapExtent(const DiskLoc& dl) const;
DiskLoc cappedListOfAllDeletedRecords() const;
DiskLoc cappedLastDelRecLastExtent() const;
void setListOfAllDeletedRecords(OperationContext* opCtx, const DiskLoc& loc);
void setLastDelRecLastExtent(OperationContext* opCtx, const DiskLoc& loc);
Extent* theCapExtent() const;
bool nextIsInCapExtent(const DiskLoc& dl) const;
void advanceCapExtent(OperationContext* opCtx, StringData ns);
void cappedTruncateLastDelUpdate(OperationContext* opCtx);
/**
* Truncate documents newer than the document at 'end' from the capped
* collection. The collection cannot be completely emptied using this
* function. An assertion will be thrown if that is attempted.
* @param inclusive - Truncate 'end' as well iff true
*/
void cappedTruncateAfter(OperationContext* opCtx, const char* ns, DiskLoc end, bool inclusive);
void _maybeComplain(OperationContext* opCtx, int len) const;
// -- end copy from cap.cpp --
CappedCallback* _cappedCallback;
OwnedPointerVector<ExtentManager::CacheHint> _extentAdvice;
friend class CappedRecordStoreV1Iterator;
};
}
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