/**
* Delete cache entries older than TTL
*
* @param string $ttl Lifetime of message cache entries
*/
function expunge($ttl)
{
// get expiration timestamp
$ts = get_offset_time($ttl, -1);
$this->db->query("DELETE FROM " . $this->db->table_name('cache_messages') . " WHERE changed < " . $this->db->fromunixtime($ts));
$this->db->query("DELETE FROM " . $this->db->table_name('cache_index') . " WHERE changed < " . $this->db->fromunixtime($ts));
$this->db->query("DELETE FROM " . $this->db->table_name('cache_thread') . " WHERE changed < " . $this->db->fromunixtime($ts));
}
/**
* Getter for IMAP cache object
*/
protected function get_cache_engine()
{
if ($this->caching && !$this->cache) {
$rcmail = rcmail::get_instance();
$ttl = $rcmail->config->get('message_cache_lifetime', '10d');
$ttl = get_offset_time($ttl) - time();
$this->cache = $rcmail->get_cache('IMAP', $this->caching, $ttl);
}
return $this->cache;
}