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// @file dur.h durability support
/**
* Copyright (C) 2009 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 <boost/filesystem/operations.hpp>
#include <list>
#include "mongo/db/storage/mmap_v1/dur_journalformat.h"
#include "mongo/util/concurrency/mutex.h"
namespace mongo {
class DurableMappedFile;
namespace dur {
struct ParsedJournalEntry;
/** call go() to execute a recovery from existing journal files.
*/
class RecoveryJob {
MONGO_DISALLOW_COPYING(RecoveryJob);
public:
RecoveryJob();
~RecoveryJob();
void go(std::vector<boost::filesystem::path>& files);
/** @param data data between header and footer. compressed if recovering. */
void processSection(const JSectHeader *h, const void *data, unsigned len, const JSectFooter *f);
// locks and calls _close()
void close();
static RecoveryJob& get() { return _instance; }
private:
class Last {
public:
Last();
DurableMappedFile* newEntry(const ParsedJournalEntry&, RecoveryJob&);
private:
DurableMappedFile* mmf;
std::string dbName;
int fileNo;
};
void write(Last& last, const ParsedJournalEntry& entry); // actually writes to the file
void applyEntry(Last& last, const ParsedJournalEntry& entry, bool apply, bool dump);
void applyEntries(const std::vector<ParsedJournalEntry> &entries);
bool processFileBuffer(const void *, unsigned len);
bool processFile(boost::filesystem::path journalfile);
void _close(); // doesn't lock
// Set of memory mapped files and a mutex to protect them
stdx::mutex _mx;
std::list<std::shared_ptr<DurableMappedFile> > _mmfs;
// Are we in recovery or WRITETODATAFILES
bool _recovering;
unsigned long long _lastDataSyncedFromLastRun;
unsigned long long _lastSeqMentionedInConsoleLog;
static RecoveryJob& _instance;
};
void replayJournalFilesAtStartup();
}
}
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