113 lines
2.6 KiB
PHP
113 lines
2.6 KiB
PHP
<?php
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interface FileTextCache
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{
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/**
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* Save extracted content for a given File entity
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*
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* @param File $file
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* @param string $content
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*/
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public function save(File $file, $content);
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/**
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* Return any cached extracted content for a given file entity
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*
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* @param File $file
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*/
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public function load(File $file);
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/**
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* Invalidate the cache for a given file.
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* Invoked in onBeforeWrite on the file
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*
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* @param File $file
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*/
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public function invalidate(File $file);
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}
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/**
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* Caches the extracted content on the record for the file.
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* Limits the stored file content by default to avoid hitting query size limits.
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*/
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class FileTextCache_Database implements FileTextCache
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{
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public function load(File $file)
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{
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return $file->FileContentCache;
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}
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public function save(File $file, $content)
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{
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$maxLength = Config::inst()->get('FileTextCache_Database', 'max_content_length');
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$file->FileContentCache = ($maxLength) ? substr($content, 0, $maxLength) : $content;
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$file->write();
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}
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public function invalidate(File $file)
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{
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// To prevent writing to the cache from invalidating it
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if (!$file->isChanged('FileContentCache')) {
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$file->FileContentCache = '';
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}
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}
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}
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/**
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* Uses SS_Cache with a lifetime to cache extracted content
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*/
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class FileTextCache_SSCache implements FileTextCache, Flushable
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{
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/**
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* Lifetime of cache in seconds
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* Null is indefinite
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*
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* @var int|null
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* @config
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*/
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private static $lifetime = null;
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/**
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* @return SS_Cache
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*/
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protected static function get_cache()
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{
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$lifetime = Config::inst()->get(__CLASS__, 'lifetime');
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$cache = SS_Cache::factory(__CLASS__);
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$cache->setLifetime($lifetime);
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return $cache;
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}
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protected function getKey(File $file)
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{
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return md5($file->getFullPath());
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}
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public function load(File $file)
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{
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$key = $this->getKey($file);
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$cache = self::get_cache();
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return $cache->load($key);
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}
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public function save(File $file, $content)
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{
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$key = $this->getKey($file);
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$cache = self::get_cache();
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return $cache->save($content, $key);
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}
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public static function flush()
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{
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$cache = self::get_cache();
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$cache->clean();
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}
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public function invalidate(File $file)
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{
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$key = $this->getKey($file);
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$cache = self::get_cache();
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return $cache->remove($key);
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}
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}
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