rss-bridge/caches/FileCache.php

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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();
$datas = json_decode(file_get_contents($this->getCacheFile()),true);
$items = array();
foreach($datas as $aData){
$item = new \Item();
foreach($aData as $name => $value){
$item->$name = $value;
}
$items[] = $item;
}
return $items;
}
public function saveData($datas){
$this->isPrepareCache();
file_put_contents($this->getCacheFile(), json_encode($datas));
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';
}
}