function DrupalFakeCache::clear

Overrides DrupalDatabaseCache::clear().

Overrides DrupalDatabaseCache::clear

File

includes/cache-install.inc, line 42

Class

DrupalFakeCache

Defines a stub cache implementation to be used during installation.

Code

function clear($cid = NULL, $wildcard = FALSE) {
    // If there is a database cache, attempt to clear it whenever possible. The
    // reason for doing this is that the database cache can accumulate data
    // during installation due to any full bootstraps that may occur at the
    // same time (for example, Ajax requests triggered by the installer). If we
    // didn't try to clear it whenever this function is called, the data in the
    // cache would become stale; for example, the installer sometimes calls
    // variable_set(), which updates the {variable} table and then clears the
    // cache to make sure that the next page request picks up the new value.
    // Not actually clearing the cache here therefore leads old variables to be
    // loaded on the first page requests after installation, which can cause
    // subtle bugs, some of which would not be fixed unless the site
    // administrator cleared the cache manually.
    try {
        if (class_exists('Database')) {
            parent::clear($cid, $wildcard);
        }
    } catch (Exception $e) {
    }
}