Cache.php

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<?php

namespace Rsi\Fred\Stream\Handler;

class Cache extends \Rsi\Fred\Stream\Handler{

  public $ttl = 3600;

  protected function key($handlers,$filename,$params){
    return md5(implode('-',$handlers) . $filename . print_r($params,true));
  }

  protected function cache($handlers,$filename,$params,&$key = null){
    return $this->_stream->cache->fetch($key = $this->key($handlers,$filename,$params));
  }

  public function time($handlers,$filename,$params = null){
    $cache = $this->cache($handlers,$filename,$params);
    return $cache ? $cache['time'] : parent::time($handlers,$filename,$params);
  }

  public function read($handlers,$filename,$params = null){
    if($cache = $this->cache($handlers,$filename,$params,$key)) return $cache['data'];
    $data = parent::read($handlers,$filename,$params);
    $this->_stream->cache->save($key,['data' => $data,'time' => parent::time($handlers,$filename,$params)],$this->ttl);
    return $data;
  }

  public function save($handlers,$filename,$params,$data){
    if(parent::save($handlers,$filename,$params,$data))
      $this->_stream->cache->delete($this->key($handlers,$filename,$params));
  }

  public function delete($handlers,$filename,$params = null){
    if(parent::delete($handlers,$filename,$params))
      $this->_stream->cache->delete($this->key($handlers,$filename,$params));
  }

}