<?php
// $Id: CacheRouter.php,v 1.1.6.8 2010-02-06 12:01:55 andypost Exp $

/**
 * @file
 *   The main class for routing to the cache engines.
 */

require dirname(__FILE__) .'/Cache.php';

class CacheRouter {
  var $map = array();
  var $settings = array();

  function __construct() {
    global $conf;
    $conf['page_cache_fastpath'] = TRUE;
  }

  private function __init($bin) {
    global $conf;

    if (isset($conf['cacherouter'][$bin]['engine']) && !isset($this->map[$bin])) {
      $type = strtolower($conf['cacherouter'][$bin]['engine']);
    }
    else {
      $type = isset($conf['cacherouter']['default']['engine']) ? $conf['cacherouter']['default']['engine'] : 'db';
    }

    $this->type[$bin] = $type;

    if (!class_exists($type . 'CacheRouterEngine')) {
      if (!require(dirname(__FILE__) .'/engines/' . $type . '.php')) {
        return FALSE;
      }
    }
    $cache_engine = $type . 'CacheRouterEngine';

    $options = array();
    if (isset($conf['cacherouter'][$bin])) {
      $options = $conf['cacherouter'][$bin];
    }

    $default_options = array();
    if (isset($conf['cacherouter']['default'])) {
      $default_options = $conf['cacherouter']['default'];
    }

    $this->map[$bin] = new $cache_engine($bin, $options, $default_options);
  }

  public function get($key, $bin) {
    if (!isset($this->map[$bin])) {
      $this->__init($bin);
    }
    return $this->map[$bin]->get($key);
  }

  public function set($key, $value, $expire, $headers, $bin) {
    if (!isset($this->map[$bin])) {
      $this->__init($bin);
    }
    return $this->map[$bin]->set($key, $value, $expire, $headers);
  }

  public function delete($key, $bin) {
    if (!isset($this->map[$bin])) {
      $this->__init($bin);
    }
    return $this->map[$bin]->delete($key);
  }

  public function flush($bin) {
    if (!isset($this->map[$bin])) {
      $this->__init($bin);
    }
    return $this->map[$bin]->flush();
  }

  public function page_fast_cache($bin) {
    if (!isset($this->map[$bin])) {
      $this->__init($bin);
    }
    return $this->map[$bin]->page_fast_cache();
  }
}