getServiceLocator() outside Controller - php

Question

I have a class: ClassA(), i need the Doctrine Service $this->getServiceLocator()->get('Doctrine\ORM\EntityManager');.
I try implements the interface ServiceManagerAwareInterface, but the functions, getServiceLocator() and setServiceLocator(ServiceLocatorInterface $serviceLocator) not work.
Someone used the ServiceLocator outside Controller class in ZF2? It's possible?
<?php
namespace DbSession\Service;
use Zend\Session\SaveHandler\SaveHandlerInterface;
use Zend\ServiceManager\ServiceLocatorAwareInterface;
use Zend\ServiceManager\ServiceLocatorAwareTrait;
/**
* Description of SessionDB
*
* #author rab
*/
class SessionDB implements SaveHandlerInterface, ServiceLocatorAwareInterface {
use ServiceLocatorAwareTrait;
/**
* Session Save Path
*
* #var string
*/
protected $sessionSavePath;
/**
* Session Name
*
* #var string
*/
protected $sessionName;
/**
* Lifetime
* #var int
*/
protected $lifetime;
/**
* Constructor
*
*/
public function __construct() {
}
/**
* Open the session
*
* #return bool
*/
public function open($savePath, $name) {
echo "open session";
}
/**
* Close the session
*
* #return bool
*/
public function close() {
echo "close session";
}
/**
* Read the session
*
* #param int session id
* #return string string of the sessoin
*/
public function read($id) {
echo "read session";
}
/**
* Write the session
*
* #param int session id
* #param string data of the session
*/
public function write($id, $data) {
$this->getServiceLocator()->get('');
echo "write";
}
/**
* Destoroy the session
*
* #param int session id
* #return bool
*/
public function destroy($id) {
echo "destroy session";
}
/**
* Garbage Collector
*
* #param int life time (sec.)
* #return bool
*/
public function gc($maxlifetime) {
echo "gc session";
}
}

Answer 1

The easiest way would be to use the ServiceLocatorAwareTrait (part of ZF2). If you do use that make sure your class implements ServiceLocatorAwareInterface (you don't actually have to implement it as the trait does that for you, but you do have to add it to your class' implements clause).
So you get something like this:
use Zend\ServiceManager\ServiceLocatorAwareInterface;
use Zend\ServiceManager\ServiceLocatorAwareTrait;
class ClassA implements ServiceLocatorAwareInterface {
use ServiceLocatorAwareTrait;
}
Then you can just call $this->getServiceLocator() to get a hold of a servicelocator instance.
However if you just need the Doctrine entitymanager it's better practice to just inject this one dependency instead of injecting the ServiceLocator.

Answer 2

Finally solved the problem. My class SessionDatabase() is correct. My instance was wrong.
Implements class:
class SessionDatabase implements SaveHandlerInterface, ServiceLocatorAwareInterface {
use ServiceLocatorAwareTrait;
public function write($id, $data) {
$em = $this->getServiceLocator()->get('Doctrine\ORM\EntityManager');
}
}
Instance:
private function initDbSession(MvcEvent $e) {
$serviceManager = $e->getApplication()->getServiceManager();
$saveHandler = new SessionDatabase();
$saveHandler->setServiceLocator($serviceManager);
}
Thanks everyone that helped!!! :D