Question

Is it possible to have two different cache instances for Zend_Cache?
For instance, if I wanted to have a set of files that are stored forever unless I delete them and another set that gets invalidated every minute — could I do that?

Everywhere I look I always see only one frontend and backend configuration used.

Thanks!

Answer 1

You simply create two different instances of Zend_Cache and stick them somewhere handy. I did something like this once, instantiating the cache instances in the boostrap, and just sticking them in the registry, like this:

protected function _initCache(){
    $this->bootstrap('config');
    $config = Zend_Registry::get('config')->myapp->cache;

    $cache = Zend_Cache::factory(
      $config->frontend->name,
      $config->backend->name,
      $config->frontend->opts->toArray(),
      $config->backend->opts->toArray()
    );
    Zend_Registry::set('cache',$cache);
    return $cache;
  }

  protected function _initUserCache(){
    $this->bootstrap('config');
    $config = Zend_Registry::get('config')->myapp->othercache;

    $cache = Zend_Cache::factory(
      $config->frontend->name,
      $config->backend->name,
      $config->frontend->opts->toArray(),
      $config->backend->opts->toArray()
    );
    Zend_Registry::set('othercache',$cache);
    return $cache;

  }

So, there’s really nothing about the design of Zend_Cache that limits the number of different caches you can have. You can configure them all independently, using whatever front-end and back-end you like for each.