class CacheService
{
  protected $cache;
  protected $tcache;
  protected $all_info;
  protected $prefix = '~aPd';

  function __construct()
  {
    $toolkit = lmbToolkit :: instance();
    $this->cache = $toolkit->createCacheConnectionByName('base');
    $this->tcahce = new lmbTaggableCache($this->cache);

    $this->all_info = 
    array(
      'blog_main_page' => array(
        'ttl' => 12*60*60,
        'tags' => array('blog_message'),
        'vars' => array('page', 'sort'),
      ),
      'text_block' => array(
        'ttl' => 24*60*60,
        'tags' => array('text_block'),
        'vars' => array('id'),
      ),
      'comparison' => array(
        'ttl' => 2*60*60,
        'vars' => array('id'),
        'tag_ids' => array('comparison' => 'id'),
      ),
      'request_dispath' => array(
        'ttl' => 7*24*60*60,
        'vars' => array('path'),
      ),
    );
  }

  function getCacheInfo($name, $vars)
  {
    if(!isset($this->all_info[$name]))
      throw new Exception('Failed name cache!');
    $raw_info = $this->all_info[$name];
    $key = 'k'.$name;
    if(isset($raw_info['vars']))
    {
      ksort($vars);
      foreach($raw_info['vars'] as $vn)
        if(isset($vars[$vn]))
          $key .= $vn.'='.$vars[$vn].';';
        else
          throw new Exception('Not set var: '.$vn);
    }
    $info = array();
    $info['key'] = $key;
    $info['ttl'] = $raw_info['ttl'];
    $info['tags'] = isset($raw_info['tags']) ? $raw_info['tags'] : array();
    if(isset($raw_info['tag_ids']))
      foreach($raw_info['tag_ids'] as $t => $v)
        if(isset($vars[$v]))
          $info['tags'][] = $t.'-id:'.$vars[$v];
        else
          throw new Exception('Not set var: '.$v);

    $info['key'] = $this->prefix.$info['key'];
    foreach($info['tags'] as $n => $v)
      $info['tags'][$n] = $this->prefix.$v;

    return $info;
  }

  function arChange($obj)
  {
    $this->_deleteByTagsForAr($obj);    
  }

  function arDestroy($obj)
  {
    $this->_deleteByTagsForAr($obj);    
  }

  protected function _deleteByTagsForAr($obj)
  {
    if(!is_string($obj))
    {
      $table = $obj->getTableName();
      $this->tcahce->deleteByTag($this->prefix.$table);
      if($obj->has('id'))
        $this->tcahce->deleteByTag($this->prefix.$table.'-id:'.$obj->id);
    }
    else
      $this->tcahce->deleteByTag($this->prefix.$obj);
  }

  function flushCache()
  {
    $this->cache->flush();
  }

  function callCache($name, $vars, $function, $params)
  {
    $info = $this->getCacheInfo($name, $vars);
    if(null !== ($value = $this->tcahce->get($info['key'])))
      return $value;
    $value = call_user_func_array($function, $params);
    if(!$value)
      $value = false;
    $this->tcahce->set($info['key'], $value, $info['ttl'], $info['tags']);
    return $value;
  }
}