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
|
/** @file glass_changes.h
* @brief Glass changesets
*/
/* Copyright 2014 Olly Betts
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
* USA
*/
#ifndef XAPIAN_INCLUDED_GLASS_CHANGES_H
#define XAPIAN_INCLUDED_GLASS_CHANGES_H
#include "glass_defs.h"
#include <string>
class GlassChanges {
/// File descriptor to write changeset to (or -1 for none).
int changes_fd;
std::string changes_stem;
/** The maximum number of changesets to keep.
*
* If a slave is more than this number of changesets behind, it will need
* to be sent a full copy of the database (which can be more efficient if
* a lot has changed).
*/
glass_revision_number_t max_changesets;
/** The oldest changeset which might exist on disk.
*
* Used to optimise removal of old changesets by giving us a point to
* start looking for ones to delete.
*/
glass_revision_number_t oldest_changeset;
public:
explicit GlassChanges(const std::string & db_dir)
: changes_fd(-1),
changes_stem(db_dir + "/changes"),
oldest_changeset(0) { }
~GlassChanges();
GlassChanges * start(glass_revision_number_t old_rev,
glass_revision_number_t rev,
int flags);
void write_block(const char * p, size_t len);
void write_block(const std::string & s) {
write_block(s.data(), s.size());
}
void set_oldest_changeset(glass_revision_number_t rev) {
oldest_changeset = rev;
}
glass_revision_number_t get_oldest_changeset() const {
return oldest_changeset;
}
void commit(glass_revision_number_t new_rev, int flags);
static void check(const std::string & changes_file);
};
#endif // XAPIAN_INCLUDED_GLASS_CHANGES_H
|
