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// @file dur_journal.h
/**
* Copyright (C) 2010 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/path.hpp>
#include "mongo/db/storage/mmap_v1/aligned_builder.h"
#include "mongo/db/storage/mmap_v1/dur_journalformat.h"
#include "mongo/db/storage/mmap_v1/logfile.h"
#include "mongo/platform/atomic_word.h"
#include "mongo/util/concurrency/mutex.h"
namespace mongo {
class ClockSource;
namespace dur {
/** the writeahead journal for durability */
class Journal {
public:
std::string dir; // set by journalMakeDir() during initialization
Journal();
/** call during startup by journalMakeDir() */
void init(ClockSource* cs, int64_t serverStartMs);
/** check if time to rotate files. assure a file is open.
done separately from the journal() call as we can do this part
outside of lock.
thread: durThread()
*/
void rotate();
/** append to the journal file
*/
void journal(const JSectHeader& h, const AlignedBuilder& b);
boost::filesystem::path getFilePathFor(int filenumber) const;
void cleanup(bool log); // closes and removes journal files
unsigned long long curFileId() const {
return _curFileId;
}
void assureLogFileOpen() {
stdx::lock_guard<SimpleMutex> lk(_curLogFileMutex);
if (_curLogFile == 0)
_open();
}
/** open a journal file to journal operations to. */
void open();
private:
/** check if time to rotate files. assure a file is open.
* internally called with every commit
*/
void _rotate(unsigned long long lsnOfCurrentJournalEntry);
void _open();
void closeCurrentJournalFile();
void removeUnneededJournalFiles();
unsigned long long _written = 0; // bytes written so far to the current journal (log) file
unsigned _nextFileNumber = 0;
SimpleMutex _curLogFileMutex;
LogFile* _curLogFile; // use _curLogFileMutex
unsigned long long _curFileId; // current file id see JHeader::fileId
struct JFile {
std::string filename;
unsigned long long lastEventTimeMs;
};
// files which have been closed but not unlinked (rotated out) yet
// ordered oldest to newest
std::list<JFile> _oldJournalFiles; // use _curLogFileMutex
// lsn related
friend void setLastSeqNumberWrittenToSharedView(uint64_t seqNumber);
friend void notifyPreDataFileFlush();
friend void notifyPostDataFileFlush();
void updateLSNFile(unsigned long long lsnOfCurrentJournalEntry);
// data <= this time is in the shared view
AtomicUInt64 _lastSeqNumberWrittenToSharedView;
// data <= this time was in the shared view when the last flush to start started
AtomicUInt64 _preFlushTime;
// data <= this time is fsynced in the datafiles (unless hard drive controller is caching)
AtomicUInt64 _lastFlushTime;
AtomicWord<bool> _writeToLSNNeeded;
ClockSource* _clock;
int64_t _serverStartMs;
};
}
}
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