blob: 84f41dae9d1dd3c1abb1df774b78039b76f227b6 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
|
// @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();
};
}
}
|
