Zend Framework 2 : Setting Default Db Adapter via Service initializers

I just read very useful tutorial from akrabat site. He explain about Zend\ServiceManager configuration keys. And, the most I like is about service initializer. It can inject to all instance of something, for example, if Model is extends AbstractTableGateway.
For example, you have SampleTable class like the following :

class SampleTable extends AbstractTableGateway
      implements \Zend\Db\Adapter\AdapterAwareInterface 
{
    protected $table = 'sampletable';
 
    public function setDbAdapter(Adapter $adapter)
    {
        $this->adapter = $adapter;
        $this->resultSetPrototype = new HydratingResultSet();
        
        $this->resultSetPrototype->setObjectPrototype(new Sample());
        $this->initialize();
    }
}

So, you can initialize of instantiation of all class that implement AdapterAwareInterface like SampleTable.

class Module 
{
    public function getServiceConfig()
    {
	return array(
	    
	    'initializers' => array(
		function ($instance, $sm) {
		    if ($instance instanceof \Zend\Db\Adapter\AdapterAwareInterface) {
			$instance->setDbAdapter($sm->get('Zend\Db\Adapter\Adapter'));
		    }
		}
	    ),
            
            'factories' => array(
                'SampleModule\Model\SampleTable' =>  function($sm){
		    $table     = new Model\SampleTable();
		    return $table;
                },
            ),
            
       );
    }    
}

Easy setup, thanks Akrabat.

Reference :
http://akrabat.com/zend-framework-2/zendservicemanager-configuration-keys/

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