mirror of
https://github.com/mongodb/mongo.git
synced 2024-12-01 09:32:32 +01:00
96 lines
3.0 KiB
C++
96 lines
3.0 KiB
C++
// @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/>.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include "../util/logfile.h"
|
|
|
|
namespace mongo {
|
|
namespace dur {
|
|
|
|
/** the writeahead journal for durability */
|
|
class Journal {
|
|
public:
|
|
string dir; // set by journalMakeDir() during initialization
|
|
|
|
Journal();
|
|
|
|
/** call during startup by journalMakeDir() */
|
|
void init();
|
|
|
|
/** 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();
|
|
|
|
/** write to journal
|
|
*/
|
|
void journal(const AlignedBuilder& b);
|
|
|
|
boost::filesystem::path getFilePathFor(int filenumber) const;
|
|
|
|
unsigned long long lastFlushTime() const { return _lastFlushTime; }
|
|
void cleanup(bool log);
|
|
|
|
unsigned long long curFileId() const { return _curFileId; }
|
|
|
|
void assureLogFileOpen() {
|
|
mutex::scoped_lock lk(_curLogFileMutex);
|
|
if( _curLogFile == 0 )
|
|
_open();
|
|
}
|
|
|
|
/** open a journal file to journal operations to. */
|
|
void open();
|
|
|
|
private:
|
|
void _open();
|
|
void closeCurrentJournalFile();
|
|
void removeUnneededJournalFiles();
|
|
|
|
unsigned long long _written; // bytes written so far to the current journal (log) file
|
|
unsigned _nextFileNumber;
|
|
|
|
mutex _curLogFileMutex;
|
|
|
|
LogFile *_curLogFile; // use _curLogFileMutex
|
|
unsigned long long _curFileId; // current file id see JHeader::fileId
|
|
|
|
struct JFile {
|
|
string filename;
|
|
unsigned long long lastEventTimeMs;
|
|
};
|
|
|
|
// files which have been closed but not unlinked (rotated out) yet
|
|
// ordered oldest to newest
|
|
list<JFile> _oldJournalFiles; // use _curLogFileMutex
|
|
|
|
// lsn related
|
|
static void preFlush();
|
|
static void postFlush();
|
|
unsigned long long _preFlushTime;
|
|
unsigned long long _lastFlushTime; // data < this time is fsynced in the datafiles (unless hard drive controller is caching)
|
|
bool _writeToLSNNeeded;
|
|
void updateLSNFile();
|
|
};
|
|
|
|
}
|
|
}
|