/**
* Object constructor.
*
* @param string $type Engine type ('db' or 'memcache' or 'apc')
* @param int $userid User identifier
* @param string $prefix Key name prefix
* @param string $ttl Expiration time of memcache/apc items
* @param bool $packed Enables/disabled data serialization.
* It's possible to disable data serialization if you're sure
* stored data will be always a safe string
*/
function __construct($type, $userid, $prefix = '', $ttl = 0, $packed = true)
{
$rcube = rcube::get_instance();
$type = strtolower($type);
if ($type == 'memcache') {
$this->type = 'memcache';
$this->db = $rcube->get_memcache();
} else {
if ($type == 'apc') {
$this->type = 'apc';
$this->db = function_exists('apc_exists');
// APC 3.1.4 required
} else {
$this->type = 'db';
$this->db = $rcube->get_dbh();
$this->table = $this->db->table_name('cache');
}
}
// convert ttl string to seconds
$ttl = get_offset_sec($ttl);
if ($ttl > 2592000) {
$ttl = 2592000;
}
$this->userid = (int) $userid;
$this->ttl = $ttl;
$this->packed = $packed;
$this->prefix = $prefix;
}
/**
* Deletes the cache record(s).
*
* @param string $key Cache key name or pattern
* @param boolean $prefix_mode Enable it to clear all keys starting
* with prefix specified in $key
*/
private function remove_record($key = null, $prefix_mode = false)
{
if (!$this->db) {
return;
}
if ($this->type != 'db') {
$this->load_index();
// Remove all keys
if ($key === null) {
foreach ($this->index as $key) {
$this->delete_record($key, false);
}
$this->index = array();
} else {
if ($prefix_mode) {
foreach ($this->index as $k) {
if (strpos($k, $key) === 0) {
$this->delete_record($k);
}
}
} else {
$this->delete_record($key);
}
}
return;
}
// Remove all keys (in specified cache)
if ($key === null) {
$where = " AND cache_key LIKE " . $this->db->quote($this->prefix . '.%');
} else {
if ($prefix_mode) {
$where = " AND cache_key LIKE " . $this->db->quote($this->prefix . '.' . $key . '%');
} else {
$where = " AND cache_key = " . $this->db->quote($this->prefix . '.' . $key);
}
}
$this->db->query("DELETE FROM " . $this->db->table_name('cache') . " WHERE user_id = ?" . $where, $this->userid);
}
