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240
ap23/web/doku/inc/Cache/Cache.php
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240
ap23/web/doku/inc/Cache/Cache.php
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<?php
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namespace dokuwiki\Cache;
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use dokuwiki\Debug\PropertyDeprecationHelper;
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use dokuwiki\Extension\Event;
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/**
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* Generic handling of caching
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*/
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class Cache
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{
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use PropertyDeprecationHelper;
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public $key = ''; // primary identifier for this item
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public $ext = ''; // file ext for cache data, secondary identifier for this item
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public $cache = ''; // cache file name
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public $depends = array(); // array containing cache dependency information,
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// used by makeDefaultCacheDecision to determine cache validity
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// phpcs:disable
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/**
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* @deprecated since 2019-02-02 use the respective getters instead!
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*/
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protected $_event = ''; // event to be triggered during useCache
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protected $_time;
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protected $_nocache = false; // if set to true, cache will not be used or stored
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// phpcs:enable
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/**
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* @param string $key primary identifier
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* @param string $ext file extension
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*/
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public function __construct($key, $ext)
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{
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$this->key = $key;
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$this->ext = $ext;
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$this->cache = getCacheName($key, $ext);
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/**
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* @deprecated since 2019-02-02 use the respective getters instead!
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*/
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$this->deprecatePublicProperty('_event');
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$this->deprecatePublicProperty('_time');
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$this->deprecatePublicProperty('_nocache');
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}
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public function getTime()
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{
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return $this->_time;
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}
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public function getEvent()
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{
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return $this->_event;
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}
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public function setEvent($event)
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{
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$this->_event = $event;
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}
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/**
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* public method to determine whether the cache can be used
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*
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* to assist in centralisation of event triggering and calculation of cache statistics,
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* don't override this function override makeDefaultCacheDecision()
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*
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* @param array $depends array of cache dependencies, support dependecies:
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* 'age' => max age of the cache in seconds
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* 'files' => cache must be younger than mtime of each file
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* (nb. dependency passes if file doesn't exist)
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*
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* @return bool true if cache can be used, false otherwise
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*/
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public function useCache($depends = array())
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{
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$this->depends = $depends;
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$this->addDependencies();
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if ($this->getEvent()) {
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return $this->stats(
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Event::createAndTrigger(
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$this->getEvent(),
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$this,
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array($this, 'makeDefaultCacheDecision')
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)
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);
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}
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return $this->stats($this->makeDefaultCacheDecision());
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}
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/**
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* internal method containing cache use decision logic
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*
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* this function processes the following keys in the depends array
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* purge - force a purge on any non empty value
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* age - expire cache if older than age (seconds)
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* files - expire cache if any file in this array was updated more recently than the cache
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*
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* Note that this function needs to be public as it is used as callback for the event handler
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*
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* can be overridden
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*
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* @internal This method may only be called by the event handler! Call \dokuwiki\Cache\Cache::useCache instead!
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*
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* @return bool see useCache()
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*/
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public function makeDefaultCacheDecision()
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{
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if ($this->_nocache) {
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return false;
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} // caching turned off
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if (!empty($this->depends['purge'])) {
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return false;
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} // purge requested?
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if (!($this->_time = @filemtime($this->cache))) {
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return false;
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} // cache exists?
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// cache too old?
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if (!empty($this->depends['age']) && ((time() - $this->_time) > $this->depends['age'])) {
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return false;
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}
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if (!empty($this->depends['files'])) {
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foreach ($this->depends['files'] as $file) {
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if ($this->_time <= @filemtime($file)) {
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return false;
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} // cache older than files it depends on?
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}
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}
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return true;
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}
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/**
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* add dependencies to the depends array
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*
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* this method should only add dependencies,
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* it should not remove any existing dependencies and
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* it should only overwrite a dependency when the new value is more stringent than the old
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*/
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protected function addDependencies()
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{
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global $INPUT;
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if ($INPUT->has('purge')) {
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$this->depends['purge'] = true;
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} // purge requested
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}
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/**
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* retrieve the cached data
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*
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* @param bool $clean true to clean line endings, false to leave line endings alone
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* @return string cache contents
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*/
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public function retrieveCache($clean = true)
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{
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return io_readFile($this->cache, $clean);
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}
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/**
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* cache $data
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*
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* @param string $data the data to be cached
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* @return bool true on success, false otherwise
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*/
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public function storeCache($data)
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{
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if ($this->_nocache) {
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return false;
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}
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return io_saveFile($this->cache, $data);
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}
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/**
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* remove any cached data associated with this cache instance
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*/
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public function removeCache()
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{
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@unlink($this->cache);
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}
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/**
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* Record cache hits statistics.
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* (Only when debugging allowed, to reduce overhead.)
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*
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* @param bool $success result of this cache use attempt
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* @return bool pass-thru $success value
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*/
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protected function stats($success)
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{
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global $conf;
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static $stats = null;
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static $file;
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if (!$conf['allowdebug']) {
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return $success;
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}
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if (is_null($stats)) {
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$file = $conf['cachedir'] . '/cache_stats.txt';
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$lines = explode("\n", io_readFile($file));
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foreach ($lines as $line) {
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$i = strpos($line, ',');
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$stats[substr($line, 0, $i)] = $line;
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}
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}
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if (isset($stats[$this->ext])) {
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list($ext, $count, $hits) = explode(',', $stats[$this->ext]);
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} else {
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$ext = $this->ext;
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$count = 0;
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$hits = 0;
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}
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$count++;
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if ($success) {
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$hits++;
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}
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$stats[$this->ext] = "$ext,$count,$hits";
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io_saveFile($file, join("\n", $stats));
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return $success;
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}
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/**
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* @return bool
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*/
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public function isNoCache()
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{
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return $this->_nocache;
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}
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}
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