rest api with pagination in zf2 - php

Question

I am running a functionality of listing the cities with the rest api url, http://localhost/cities, to get the result set as:
[
{
"status": "SUCCESS",
"totalRecords": 1220,
"cities": [
{
"id": 1,
"name": "New York"
},
{
"id": 2,
"name": "Washington"
}
.....
]
}
]
and this is my code:
Module Config:
'listcities' => array(
'type' => 'segment',
'options' => array(
'route' => '/cities',
'defaults' => array(
'controller' => 'City\Controller\City',
'action' => 'listCities',
),
),
),
City Controller:
public function listCitiesAction() {
header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Methods: GET');
header("Access-Control-Allow-Headers: X-Requested-With, Content-Type");
$response = array();
$cities = $this->libraryService->listCities();
if (isset($cities) && count($cities) > 0) {
$response[] = $this->getCityResponse($cities);
} else {
$response['status'] = 'FAILURE';
$response['errorCode'] = 578;
$response['errorMessage'] = "No cities found";
}
return new JsonModel($response);
}
private function getCityResponse($cities) {
$citiesArray = array();
$response = array();
foreach ($cities as $city) {
$citiesArray[] = ['id' => $city->getId(),
'name' => $city->getName()
];
}
$response['status'] = 'SUCCESS';
$response['totalRecords'] = count($citiesArray);
$response['cities'] = $citiesArray;
return $response;
}
The above code is from the controller, where the service is called and from the service, repository model is called to get the list of cities. So hereby i used the Doctrine2 ORM, to list the cities. My question how can i insert the pagination script in the Doctrine2 ORM.
City Reposity:
public function findAll() {
return $this->entityManager->getRepository('Library\Entity\City')
->findBy(array('active' => true));
}