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// record_store_heap.h
/**
* Copyright (C) 2014 MongoDB 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 <boost/shared_array.hpp>
#include <map>
#include "mongo/db/structure/capped_callback.h"
#include "mongo/db/structure/record_store.h"
namespace mongo {
class HeapRecordIterator;
/**
* A RecordStore that stores all data on the heap.
*
* @param cappedMaxSize - required if isCapped. limit uses dataSize() in this impl.
*/
class HeapRecordStore : public RecordStore {
public:
explicit HeapRecordStore(const StringData& ns,
bool isCapped = false,
int64_t cappedMaxSize = -1,
int64_t cappedMaxDocs = -1,
CappedDocumentDeleteCallback* cappedDeleteCallback = NULL);
virtual const char* name() const;
virtual Record* recordFor( const DiskLoc& loc ) const;
virtual void deleteRecord( TransactionExperiment* txn, const DiskLoc& dl );
virtual StatusWith<DiskLoc> insertRecord( TransactionExperiment* txn,
const char* data,
int len,
int quotaMax );
virtual StatusWith<DiskLoc> insertRecord( TransactionExperiment* txn,
const DocWriter* doc,
int quotaMax );
virtual RecordIterator* getIterator( const DiskLoc& start, bool tailable,
const CollectionScanParams::Direction& dir) const;
virtual RecordIterator* getIteratorForRepair() const;
virtual std::vector<RecordIterator*> getManyIterators() const;
virtual Status truncate( TransactionExperiment* txn );
virtual bool compactSupported() const;
virtual Status compact( TransactionExperiment* txn,
RecordStoreCompactAdaptor* adaptor,
const CompactOptions* options,
CompactStats* stats );
virtual Status validate( TransactionExperiment* txn,
bool full,
bool scanData,
ValidateAdaptor* adaptor,
ValidateResults* results, BSONObjBuilder* output ) const;
virtual Status touch( TransactionExperiment* txn, BSONObjBuilder* output ) const;
virtual void increaseStorageSize( TransactionExperiment* txn, int size, int quotaMax );
virtual int64_t storageSize(BSONObjBuilder* extraInfo = NULL, int infoLevel = 0) const;
virtual long long dataSize() const { return _dataSize; }
virtual long long numRecords() const { return _records.size(); }
//
// Not in RecordStore interface
//
typedef std::map<DiskLoc, boost::shared_array<char> > Records;
bool isCapped() const { return _isCapped; }
bool cappedMaxDocs() const { invariant(_isCapped); return _cappedMaxDocs; }
bool cappedMaxSize() const { invariant(_isCapped); return _cappedMaxSize; }
private:
DiskLoc allocateLoc();
bool cappedAndNeedDelete() const;
void cappedDeleteAsNeeded(TransactionExperiment* txn);
// TODO figure out a proper solution to metadata
const bool _isCapped;
const int64_t _cappedMaxSize;
const int64_t _cappedMaxDocs;
CappedDocumentDeleteCallback* const _cappedDeleteCallback;
int64_t _dataSize;
Records _records;
int64_t _nextId;
};
class HeapRecordIterator : public RecordIterator {
public:
HeapRecordIterator(const HeapRecordStore::Records& records,
const HeapRecordStore& rs,
DiskLoc start = DiskLoc(),
bool tailable = false);
virtual bool isEOF();
virtual DiskLoc curr();
virtual DiskLoc getNext();
virtual void invalidate(const DiskLoc& dl);
virtual void prepareToYield();
virtual bool recoverFromYield();
virtual const Record* recordFor( const DiskLoc& loc ) const;
private:
HeapRecordStore::Records::const_iterator _it;
bool _tailable;
DiskLoc _lastLoc; // only for restarting tailable
bool _killedByInvalidate;
const HeapRecordStore::Records& _records;
const HeapRecordStore& _rs;
};
class HeapRecordReverseIterator : public RecordIterator {
public:
HeapRecordReverseIterator(const HeapRecordStore::Records& records,
const HeapRecordStore& rs,
DiskLoc start = DiskLoc());
virtual bool isEOF();
virtual DiskLoc curr();
virtual DiskLoc getNext();
virtual void invalidate(const DiskLoc& dl);
virtual void prepareToYield();
virtual bool recoverFromYield();
virtual const Record* recordFor( const DiskLoc& loc ) const;
private:
HeapRecordStore::Records::const_reverse_iterator _it;
bool _killedByInvalidate;
const HeapRecordStore::Records& _records;
const HeapRecordStore& _rs;
};
} // namespace mongo
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