/**
* Returns all instances that implement the requested interface or all of them in not supplied
* @param string $interface
* @return array<KalturaPlugin>
*/
public static function getPluginInstances($interface = null)
{
if (!count(self::$pluginInstances)) {
self::$pluginInstances = array();
$plugins = self::getPlugins();
foreach ($plugins as $pluginName => $pluginClass) {
if (!$pluginClass || !class_exists($pluginClass)) {
continue;
}
if (!self::isValid($pluginClass, array_keys(self::$pluginInstances))) {
continue;
}
self::$pluginInstances[$pluginName] = new $pluginClass();
}
}
if (is_null($interface)) {
return self::$pluginInstances;
}
$instances = array();
foreach (self::$pluginInstances as $pluginInstance) {
if ($pluginInstance instanceof IKalturaPlugin) {
$instance = $pluginInstance->getInstance($interface);
if ($instance) {
$instances[strtolower($pluginInstance->getPluginName())] = $instance;
}
}
}
return $instances;
}