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// mmap_v1_engine.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 <map>
#include "mongo/db/storage/mmap_v1/extent_manager.h"
#include "mongo/db/storage/mmap_v1/record_access_tracker.h"
#include "mongo/db/storage/storage_engine.h"
#include "mongo/stdx/mutex.h"
namespace mongo {
class ClockSource;
class JournalListener;
class MMAPV1DatabaseCatalogEntry;
class MMAPV1Engine : public StorageEngine {
public:
MMAPV1Engine(const StorageEngineLockFile* lockFile, ClockSource* cs);
virtual ~MMAPV1Engine();
void finishInit();
RecoveryUnit* newRecoveryUnit();
void listDatabases(std::vector<std::string>* out) const;
int flushAllFiles(bool sync);
Status beginBackup(OperationContext* txn);
void endBackup(OperationContext* txn);
DatabaseCatalogEntry* getDatabaseCatalogEntry(OperationContext* opCtx, StringData db);
virtual bool supportsDocLocking() const {
return false;
}
virtual bool isMmapV1() const {
return true;
}
virtual bool isDurable() const;
virtual bool isEphemeral() const;
virtual Status closeDatabase(OperationContext* txn, StringData db);
virtual Status dropDatabase(OperationContext* txn, StringData db);
virtual void cleanShutdown();
// Callers should use repairDatabase instead.
virtual Status repairRecordStore(OperationContext* txn, const std::string& ns) {
return Status(ErrorCodes::InternalError, "MMAPv1 doesn't support repairRecordStore");
}
// MMAPv1 specific (non-virtual)
Status repairDatabase(OperationContext* txn,
const std::string& dbName,
bool preserveClonedFilesOnFailure,
bool backupOriginalFiles);
/**
* Gets a reference to the abstraction used by MMAP v1 to track recently used memory
* addresses.
*
* MMAPv1 specific (non-virtual). This is non-const because callers are allowed to use
* the returned reference to modify the RecordAccessTracker.
*
* The RecordAccessTracker is thread-safe (it uses its own mutex internally).
*/
RecordAccessTracker& getRecordAccessTracker();
void setJournalListener(JournalListener* jl) final;
private:
static void _listDatabases(const std::string& directory, std::vector<std::string>* out);
stdx::mutex _entryMapMutex;
typedef std::map<std::string, MMAPV1DatabaseCatalogEntry*> EntryMap;
EntryMap _entryMap;
// A record access tracker is essentially a large table which tracks recently used
// addresses. It is used when higher layers (e.g. the query system) need to ask
// the storage engine whether data is likely in physical memory.
RecordAccessTracker _recordAccessTracker;
std::unique_ptr<ExtentManager::Factory> _extentManagerFactory;
ClockSource* _clock;
int64_t _startMs;
};
void _deleteDataFiles(const std::string& database);
}
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