blob: bafc0570f19f2f2b4074af85822541249c402ca3 (
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
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
|
// @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 "mongo/db/dur_journalformat.h"
#include "mongo/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();
/** append to the journal file
*/
void journal(const JSectHeader& h, const AlignedBuilder& b);
boost::filesystem::path getFilePathFor(int filenumber) const;
unsigned long long lastFlushTime() const { return _lastFlushTime; }
void cleanup(bool log); // closes and removes journal files
unsigned long long curFileId() const { return _curFileId; }
void assureLogFileOpen() {
SimpleMutex::scoped_lock 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();
void _open();
void closeCurrentJournalFile();
void removeUnneededJournalFiles();
unsigned long long _written; // bytes written so far to the current journal (log) file
unsigned _nextFileNumber;
SimpleMutex _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();
};
}
}
|
