/**
* Return cached backup id's
*
* @param int $restoreid id of backup
* @param string $itemname name of the item
* @param int $itemid id of item
* @return array backup id's
* @todo MDL-25290 replace static backupids* with MUC code
*/
protected static function get_backup_ids_cached($restoreid, $itemname, $itemid)
{
global $DB;
$key = "{$itemid} {$itemname} {$restoreid}";
// If record exists in cache then return.
if (isset(self::$backupidsexist[$key]) && isset(self::$backupidscache[$key])) {
// Return a copy of cached data, to avoid any alterations in cached data.
return clone self::$backupidscache[$key];
}
// Clean cache, if it's full.
if (self::$backupidscachesize <= 0) {
// Remove some records, to keep memory in limit.
self::$backupidscache = array_slice(self::$backupidscache, self::$backupidsslice, null, true);
self::$backupidscachesize = self::$backupidscachesize + self::$backupidsslice;
}
if (self::$backupidsexistsize <= 0) {
self::$backupidsexist = array_slice(self::$backupidsexist, self::$backupidsslice, null, true);
self::$backupidsexistsize = self::$backupidsexistsize + self::$backupidsslice;
}
// Retrive record from database.
$record = array('backupid' => $restoreid, 'itemname' => $itemname, 'itemid' => $itemid);
if ($dbrec = $DB->get_record('backup_ids_temp', $record)) {
self::$backupidsexist[$key] = $dbrec->id;
self::$backupidscache[$key] = $dbrec;
self::$backupidscachesize--;
self::$backupidsexistsize--;
return $dbrec;
} else {
return false;
}
}
/**
* Reset the ids caches completely
*
* Any destructive operation (partial delete, truncate, drop or recreate) performed
* with the backup_ids table must cause the backup_ids caches to be
* invalidated by calling this method. See MDL-33630.
*
* Note that right now, the only operation of that type is the recreation
* (drop & restore) of the table that may happen once the prechecks have ended. All
* the rest of operations are always routed via {@link set_backup_ids_record()}, 1 by 1,
* keeping the caches on sync.
*
* @todo MDL-25290 static should be replaced with MUC code.
*/
public static function reset_backup_ids_cached()
{
// Reset the ids cache.
$cachetoadd = count(self::$backupidscache);
self::$backupidscache = array();
self::$backupidscachesize = self::$backupidscachesize + $cachetoadd;
// Reset the exists cache.
$existstoadd = count(self::$backupidsexist);
self::$backupidsexist = array();
self::$backupidsexistsize = self::$backupidsexistsize + $existstoadd;
}
