Implements DrupalCacheInterface::getMultiple().

Parameters

$cids: An array of cache IDs for the data to retrieve. This is passed by reference, and will have the IDs successfully returned from cache removed.

Return value

An array of the items successfully returned from cache indexed by cid.

Overrides DrupalCacheInterface::getMultiple

1 call to DrupalDatabaseCache::getMultiple()

DrupalDatabaseCache::get in includes/cache.inc

Implements DrupalCacheInterface::get().

1 method overrides DrupalDatabaseCache::getMultiple()

DrupalFakeCache::getMultiple in includes/cache-install.inc

Overrides DrupalDatabaseCache::getMultiple().

File

includes/cache.inc, line 347

Class

DrupalDatabaseCache

Defines a default cache implementation.

Code

function getMultiple(&$cids) {
    try {
        // Garbage collection necessary when enforcing a minimum cache lifetime.
        $this->garbageCollection($this->bin);
        // When serving cached pages, the overhead of using db_select() was found
        // to add around 30% overhead to the request. Since $this->bin is a
        // variable, this means the call to db_query() here uses a concatenated
        // string. This is highly discouraged under any other circumstances, and
        // is used here only due to the performance overhead we would incur
        // otherwise. When serving an uncached page, the overhead of using
        // db_select() is a much smaller proportion of the request.
        $result = db_query('SELECT cid, data, created, expire, serialized FROM {' . db_escape_table($this->bin) . '} WHERE cid IN (:cids)', array(
            ':cids' => $cids,
        ));
        $cache = array();
        foreach ($result as $item) {
            $item = $this->prepareItem($item);
            if ($item) {
                $cache[$item->cid] = $item;
            }
        }
        $cids = array_diff($cids, array_keys($cache));
        return $cache;
    } catch (Exception $e) {
        // If the database is never going to be available, cache requests should
        // return FALSE in order to allow exception handling to occur.
        return array();
    }
}

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