public static function getIterator($pattern)
{
// sanity check pattern
if (!preg_match('/^(.).+\\1[a-zA-Z]*$/', $pattern)) {
throw new Exception('Cache iterator pattern doesn\'t appear to have matching delimiters');
}
// modify pattern to insert key prefix and isolate matches to this site
$prefixPattern = preg_quote(static::getKeyPrefix());
if ($pattern[1] == '^') {
$pattern = substr_replace($pattern, $prefixPattern, 2, 0);
} else {
$pattern = substr_replace($pattern, '^' . $prefixPattern . '.*', 1, 0);
}
return CacheIterator::createFromPattern($pattern);
}
public function clearCacheTree($record, $key = null)
{
if (!$key) {
$key = static::getCacheKey($record['Handle'], $record['ParentID'], $record['Site'] == 'Remote');
}
Cache::delete($key);
// iterate child collections
$childCollectionsKey = static::getCacheKey('.*', $record['ID'], $record['Site'] == 'Remote');
foreach (CacheIterator::getIterator('|^' . $childCollectionsKey . '|') as $childCollection) {
if ($childCollection['value']) {
static::clearCacheTree($childCollection['value'], $childCollection['key']);
}
}
// iterate child files
$childFilesKey = SiteFile::getCacheKey($record['ID'], '.*');
foreach (CacheIterator::getIterator('|^' . $childFilesKey . '|') as $childFile) {
if ($childFile['value']) {
Cache::delete($childFile['key']);
}
}
}