public function setIamPolicy($resource, $policy, $optionalArgs = [])
{
$request = new SetIamPolicyRequest();
$request->setResource($resource);
$request->setPolicy($policy);
$mergedSettings = $this->defaultCallSettings['setIamPolicy']->merge(new CallSettings($optionalArgs));
$callable = ApiCallable::createApiCall($this->iamPolicyStub, 'SetIamPolicy', $mergedSettings, $this->descriptors['setIamPolicy']);
return $callable($request, [], ['call_credentials_callback' => $this->createCredentialsCallback()]);
}