在zf2项目的任何地方调用服务，工厂

Question

I am a newbie to zend framework. I am worrying how to call a service,factory other than from a controller (or class which is not extended AbstractActionController).

I am using the ZfcUser module to authenticate users. Now I want to check wheather a user logged or not inside the ZfcUser\Form\Base class. I am unable to call the zfcUserAuthentication factory which inside the getControllerPluginConfig() in ZfcUser\Module

Please some one help me.

Thank you

Answer 1

What you are looking at is the concept of Dependency Injection. Basically YOU need to make sure that the Services you create GAIN access to the Gateways or Services they need.

For example, if you have a Service that takes care about persisting your Entities (DataObjects) to the Database, then YOU need to make sure to "inject" the Database-Adapter into the ServiceObject.

Required Dependencies therefore should be set via Constructor injection, i.e.:

class MyService {
    public function __construct(DbAdapter $dbA) {
        // do stuff with $dbA
    }
}

And you create this via the ServiceManager

'service_manager' => array(
    'factories' => array(
        'MyService' => function($sm) {
             $dbAdapter = $sm->get('Zend\Db\Adapter\Adapter');
             $service   = new MyService($dbAdapter);
             return $service;
         }
    )
)

And lastly you access your service via the ServiceManager (probably somewhere in your controller).

public function someAction() {
    $service = $this->getServiceLocator()->get('MyService');
    // do stuff with $service
}