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1 | <?php |
2 | /** |
3 | * This program is free software; you can redistribute it and/or modify |
4 | * it under the terms of the GNU General Public License as published by |
5 | * the Free Software Foundation; either version 2 of the License, or |
6 | * (at your option) any later version. |
7 | * |
8 | * This program is distributed in the hope that it will be useful, |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
11 | * GNU General Public License for more details. |
12 | * |
13 | * You should have received a copy of the GNU General Public License along |
14 | * with this program; if not, write to the Free Software Foundation, Inc., |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
16 | * http://www.gnu.org/copyleft/gpl.html |
17 | * |
18 | * @file |
19 | */ |
20 | |
21 | /** |
22 | * Interface for the persistence layer of LocalisationCache. |
23 | * |
24 | * The persistence layer is a two-level hierarchical cache. The first level |
25 | * is the language, the second level is the item or subitem. |
26 | * |
27 | * Since the data for a whole language is rebuilt in one operation, it needs |
28 | * to have a fast and atomic method for deleting or replacing all the |
29 | * current data for a given language. The interface reflects this bulk update |
30 | * operation. Callers writing to the cache must first call startWrite(), then |
31 | * will call set() a couple of thousand times, then will call finishWrite() |
32 | * to commit the operation. When finishWrite() is called, the cache is |
33 | * expected to delete all data previously stored for that language. |
34 | * |
35 | * The values stored are PHP variables suitable for serialize(). Implementations |
36 | * of LCStore are responsible for serializing and unserializing. |
37 | * |
38 | * @ingroup Language |
39 | */ |
40 | interface LCStore { |
41 | |
42 | /** |
43 | * Get a value. |
44 | * |
45 | * @param string $code Language code |
46 | * @param string $key Cache key |
47 | */ |
48 | public function get( $code, $key ); |
49 | |
50 | /** |
51 | * Start a cache write transaction. |
52 | * |
53 | * @param string $code Language code |
54 | */ |
55 | public function startWrite( $code ); |
56 | |
57 | /** |
58 | * Finish a cache write transaction. |
59 | */ |
60 | public function finishWrite(); |
61 | |
62 | /** |
63 | * Set a key to a given value. startWrite() must be called before this |
64 | * is called, and finishWrite() must be called after. |
65 | * |
66 | * @param string $key |
67 | * @param mixed $value |
68 | */ |
69 | public function set( $key, $value ); |
70 | |
71 | } |