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1 | <?php |
2 | /** |
3 | * Generic interface providing error code and quality-of-service constants for object stores |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License as published by |
7 | * the Free Software Foundation; either version 2 of the License, or |
8 | * (at your option) any later version. |
9 | * |
10 | * This program is distributed in the hope that it will be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | * GNU General Public License for more details. |
14 | * |
15 | * You should have received a copy of the GNU General Public License along |
16 | * with this program; if not, write to the Free Software Foundation, Inc., |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
18 | * http://www.gnu.org/copyleft/gpl.html |
19 | * |
20 | * @file |
21 | * @ingroup Cache |
22 | */ |
23 | |
24 | namespace Wikimedia\LightweightObjectStore; |
25 | |
26 | /** |
27 | * Generic interface providing error code and quality-of-service constants for object stores |
28 | * |
29 | * @ingroup Cache |
30 | * @since 1.35 |
31 | */ |
32 | interface StorageAwareness { |
33 | /** No storage medium error */ |
34 | public const ERR_NONE = 0; |
35 | /** Storage medium failed to yield a complete response to an operation */ |
36 | public const ERR_NO_RESPONSE = 1; |
37 | /** Storage medium could not be reached to establish a connection */ |
38 | public const ERR_UNREACHABLE = 2; |
39 | /** Storage medium operation failed due to usage limitations or an I/O error */ |
40 | public const ERR_UNEXPECTED = 3; |
41 | |
42 | /** @deprecated Since 1.41; Emulation/fallback mode; see QOS_EMULATION_*; higher is better */ |
43 | public const ATTR_EMULATION = 1; |
44 | /** Durability of writes; see QOS_DURABILITY_* (higher means stronger) */ |
45 | public const ATTR_DURABILITY = 2; |
46 | |
47 | /** Data is never saved to begin with (blackhole store) */ |
48 | public const QOS_DURABILITY_NONE = 1; |
49 | /** Data is lost at the end of the current web request or CLI script */ |
50 | public const QOS_DURABILITY_SCRIPT = 2; |
51 | /** Data is lost once the service storing the data restarts */ |
52 | public const QOS_DURABILITY_SERVICE = 3; |
53 | /** Data is saved to disk and writes do not usually block on fsync() */ |
54 | public const QOS_DURABILITY_DISK = 4; |
55 | /** Data is saved to disk and writes usually block on fsync(), like a standard RDBMS */ |
56 | public const QOS_DURABILITY_RDBMS = 5; |
57 | |
58 | /** Generic "unknown" value; useful for comparisons (always "good enough") */ |
59 | public const QOS_UNKNOWN = INF; |
60 | } |