public static function singleton($o, $id = NULL, $class = NULL)
{
if (!self::$active) {
return $o;
}
if (!is_object($o) || !$o instanceof Model) {
throw new Exception("trying to get singleton of non-Model instance");
}
if (!isset($class)) {
$class = get_class($o);
}
if (Model::_has_complex_primary_key($class)) {
return $o;
}
if (!isset($id)) {
$PK = Model::_simple_primary_key($o);
$id = $o->{$PK};
}
if ($x = ObjectCache::get($class, $id)) {
return $x;
} else {
ObjectCache::store($class, $id, $o);
return $o;
}
}
/**
* Tests loading an object that is not stored actually.
*/
public function testGetNull()
{
$this->assertNull($this->cache->{self::CACHE_KEY});
$this->assertNull(ObjectCache::get(self::CACHE_KEY));
}
