rss-bridge/caches/FileCache.php

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2013-08-11 13:30:41 +02:00
<?php
/**
* Cache with file system
*/
class FileCache extends CacheAbstract{
protected $cacheDirCreated; // boolean to avoid always chck dir cache existance
public function loadData(){
$this->isPrepareCache();
$datas = unserialize(file_get_contents($this->getCacheFile()));
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return $datas;
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}
public function saveData($datas){
$this->isPrepareCache();
//Re-encode datas to UTF-8
//$datas = Cache::utf8_encode_deep($datas);
$writeStream = file_put_contents($this->getCacheFile(), serialize($datas));
if(!$writeStream) {
throw new \Exception("Cannot write the cache... Do you have the right permissions ?");
}
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return $this;
}
public function getTime(){
$this->isPrepareCache();
$cacheFile = $this->getCacheFile();
if( file_exists($cacheFile) ){
return filemtime($cacheFile);
}
return false;
}
/**
* Cache is prepared ?
* Note : Cache name is based on request information, then cache must be prepare before use
* @return \Exception|true
*/
protected function isPrepareCache(){
if( is_null($this->param) ){
throw new \Exception('Please feed "prepare" method before try to load');
}
return true;
}
/**
* Return cache path (and create if not exist)
* @return string Cache path
*/
protected function getCachePath(){
$cacheDir = __DIR__ . '/../cache/'; // FIXME : configuration ?
// FIXME : implement recursive dir creation
if( is_null($this->cacheDirCreated) && !is_dir($cacheDir) ){
$this->cacheDirCreated = true;
mkdir($cacheDir,0705);
chmod($cacheDir,0705);
}
return $cacheDir;
}
/**
* Get the file name use for cache store
* @return string Path to the file cache
*/
protected function getCacheFile(){
return $this->getCachePath() . $this->getCacheName();
}
/**
* Determines file name for store the cache
* return string
*/
protected function getCacheName(){
$this->isPrepareCache();
$stringToEncode = $_SERVER['REQUEST_URI'] . http_build_query($this->param);
return hash('sha1', $stringToEncode) . '.cache';
}
}