ryxeo-glpi-git / htdocs / lib / cache_lite / Lite / File.php @ 1c14bcc4
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| 1 | 1c14bcc4 | Eric Seigne | <?php
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| 2 | |||
| 3 | /**
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| 4 | * This class extends Cache_Lite and offers a cache system driven by a master file
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| 5 | *
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| 6 | * With this class, cache validity is only dependent of a given file. Cache files
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| 7 | * are valid only if they are older than the master file. It's a perfect way for
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| 8 | * caching templates results (if the template file is newer than the cache, cache
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| 9 | * must be rebuild...) or for config classes...
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| 10 | * There are some examples in the 'docs/examples' file
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| 11 | * Technical choices are described in the 'docs/technical' file
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| 12 | *
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| 13 | * @package Cache_Lite
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| 14 | * @version $Id: File.php,v 1.3 2005/12/04 16:03:55 fab Exp $
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| 15 | * @author Fabien MARTY <fab@php.net>
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| 16 | */
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| 17 | |||
| 18 | require_once(GLPI_CACHE_LITE_DIR.'/Lite.php'); |
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| 19 | |||
| 20 | class Cache_Lite_File extends Cache_Lite |
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| 21 | {
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| 22 | |||
| 23 | // --- Private properties ---
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| 24 | |||
| 25 | /**
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| 26 | * Complete path of the file used for controlling the cache lifetime
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| 27 | *
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| 28 | * @var string $_masterFile
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| 29 | */
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| 30 | var $_masterFile = ''; |
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| 31 | |||
| 32 | /**
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| 33 | * Masterfile mtime
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| 34 | *
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| 35 | * @var int $_masterFile_mtime
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| 36 | */
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| 37 | var $_masterFile_mtime = 0; |
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| 38 | |||
| 39 | // --- Public methods ----
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| 40 | |||
| 41 | /**
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| 42 | * Constructor
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| 43 | *
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| 44 | * $options is an assoc. To have a look at availables options,
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| 45 | * see the constructor of the Cache_Lite class in 'Cache_Lite.php'
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| 46 | *
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| 47 | * Comparing to Cache_Lite constructor, there is another option :
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| 48 | * $options = array(
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| 49 | * (...) see Cache_Lite constructor
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| 50 | * 'masterFile' => complete path of the file used for controlling the cache lifetime(string)
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| 51 | * );
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| 52 | *
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| 53 | * @param array $options options
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| 54 | * @access public
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| 55 | */
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| 56 | function Cache_Lite_File($options = array(NULL)) |
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| 57 | {
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| 58 | $options['lifetime'] = 0; |
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| 59 | $this->Cache_Lite($options); |
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| 60 | if (isset($options['masterFile'])) { |
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| 61 | $this->_masterFile = $options['masterFile']; |
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| 62 | } else {
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| 63 | return $this->raiseError('Cache_Lite_File : masterFile option must be set !'); |
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| 64 | } |
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| 65 | if (!($this->_masterFile_mtime = @filemtime($this->_masterFile))) { |
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| 66 | return $this->raiseError('Cache_Lite_File : Unable to read masterFile : '.$this->_masterFile, -3); |
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| 67 | } |
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| 68 | } |
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| 69 | |||
| 70 | /**
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| 71 | * Test if a cache is available and (if yes) return it
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| 72 | *
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| 73 | * @param string $id cache id
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| 74 | * @param string $group name of the cache group
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| 75 | * @return string data of the cache (or false if no cache available)
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| 76 | * @access public
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| 77 | */
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| 78 | function get($id, $group = 'default') |
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| 79 | {
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| 80 | if ($data = parent::get($id, $group, true)) { |
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| 81 | if ($filemtime = $this->lastModified()) { |
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| 82 | if ($filemtime > $this->_masterFile_mtime) { |
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| 83 | return $data; |
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| 84 | } |
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| 85 | } |
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| 86 | } |
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| 87 | return false; |
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| 88 | } |
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| 89 | |||
| 90 | } |
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| 91 | |||
| 92 | ?> |