protected function prepareCallbackServiceName($callbackServiceName)
{
if (is_callable($callbackServiceName)) {
if (is_string($callbackServiceName) && $this->callbackManager->has($callbackServiceName)) {
throw new CallbackException('Specified service name is ambiguous:
both service name and callable are exist');
}
$callbackServiceName = $this->serializeCallback($callbackServiceName);
} elseif (is_string($callbackServiceName) && !$this->callbackManager->has($callbackServiceName)) {
throw new CallbackException('Specified callback "' . $callbackServiceName . '" doesn\'t exist');
}
return $callbackServiceName;
}
