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<?php
namespace dokuwiki\Cache;
/**
* Caching of data of renderer
*/
class CacheRenderer extends CacheParser
{
/**
* method contains cache use decision logic
*
* @return bool see useCache()
*/
public function makeDefaultCacheDecision()
{
global $conf;
if (!parent::makeDefaultCacheDecision()) {
return false;
}
if (!isset($this->page)) {
return true;
}
// meta cache older than file it depends on?
if ($this->_time < @filemtime(metaFN($this->page, '.meta'))) {
return false;
}
// check current link existence is consistent with cache version
// first check the purgefile
// - if the cache is more recent than the purgefile we know no links can have been updated
if ($this->_time >= @filemtime($conf['cachedir'] . '/purgefile')) {
return true;
}
// for wiki pages, check metadata dependencies
$metadata = p_get_metadata($this->page);
if (!isset($metadata['relation']['references']) ||
empty($metadata['relation']['references'])) {
return true;
}
foreach ($metadata['relation']['references'] as $id => $exists) {
if ($exists != page_exists($id, '', false)) {
return false;
}
}
return true;
}
protected function addDependencies()
{
global $conf;
// default renderer cache file 'age' is dependent on 'cachetime' setting, two special values:
// -1 : do not cache (should not be overridden)
// 0 : cache never expires (can be overridden) - no need to set depends['age']
if ($conf['cachetime'] == -1) {
$this->_nocache = true;
return;
} elseif ($conf['cachetime'] > 0) {
$this->depends['age'] = isset($this->depends['age']) ?
min($this->depends['age'], $conf['cachetime']) : $conf['cachetime'];
}
// renderer cache file dependencies ...
$files = array(
DOKU_INC . 'inc/parser/' . $this->mode . '.php', // ... the renderer
);
// page implies metadata and possibly some other dependencies
if (isset($this->page)) {
// for xhtml this will render the metadata if needed
$valid = p_get_metadata($this->page, 'date valid');
if (!empty($valid['age'])) {
$this->depends['age'] = isset($this->depends['age']) ?
min($this->depends['age'], $valid['age']) : $valid['age'];
}
}
$this->depends['files'] = !empty($this->depends['files']) ?
array_merge($files, $this->depends['files']) :
$files;
parent::addDependencies();
}
}
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