zend framework2 - What is the way to bootstrap Zend2 plugins properly? -

currently i'm writing plugins that:

namespace lawyers\controller\plugin;  use zend\mvc\controller\plugin\abstractplugin,     braintree braintreesdk;  class braintree extends abstractplugin {     protected $__initialized = false;      protected $__pm;     protected $__em;      /**      * set braintree config settings      *      * @return void      */     protected function init() {         if($this->__initialized) {             return;         }          $this->__pm = $this->getcontroller()->getentityrepository();         $this->__pm = $this->__pm['externalpayment'];         $this->__em =  $this->getcontroller()->getentitymanager();          $config = $this->getcontroller()->getservicelocator()->get('config');          \braintree_configuration::environment($config['braintree']['env']);         \braintree_configuration::merchantid($config['braintree']['merchant_id']);         \braintree_configuration::publickey($config['braintree']['public_key']);         \braintree_configuration::privatekey($config['braintree']['private_key']);          $this->__initialized = true;     }        /**      * create new entity transaction      *      * @return \lawyers\model\entity\externalpayment      */     protected function spawn() {         return new \lawyers\model\entity\externalpayment();     }        /**      * new sales transaction      *      * @param mixed $payer - person pays transaction      * @param mixed $source - source of payment: lawyers\model\entity\questions or lawyers\model\entity\lead      * @param array $transaction - payment details:      *      'amount' => '1000.00',      *      'creditcard' => array(      *          'number' => '5105105105105100',      *          'expirationdate' => '05/12'      *      )      * @return mixed - transaction id or null      */     public function sell($payer, $source, $transaction) {         $this->init();          $data = array(             'status' => 'pending',             'amount' => $transaction['amount'],         );          # ....     } } 

what proper way initialize instance variables plugins without using $this->init() in every call? saw no constructor method plugins :(

you can adding initializer plugin manager

first have plugin implement zend\stdlib\initializableinterface. (you'll need make init method public)

namespace lawyers\controller\plugin;  use zend\mvc\controller\plugin\abstractplugin,     braintree braintreesdk; use zend\stdlib\initializableinterface;  class braintree extends abstractplugin implements initializableinterface {     /**      * set braintree config settings      *      * @return void      */     public function init() {         // ..     }  } 

then in module bootstrap add initializer.

<?php namespace lawyers;  use zend\stdlib\initializableinterface;  class module {     public function onbootstrap(mvcevent $e)          $sm = $e->getapplication()->getservicemanager();          $plugins = $sm->get('controllerpluginmanager');                      $plugins->addinitializer(function($plugin, $pm) {             if ($plugin instanceof initializableinterface) {                 $plugin->init();             }         }, false); // false tells manager not add top of stack     } }  

note: intializer added implementing zend\modulemanager\feature\controllerpluginproviderinterface in module class, , using getcontrollerpluginconfig method, or via controller_plugins key in module.config.php. neither of methods allow place initializer @ bottom of stack, necessary here otherwise plugin potentially init before other initializers have had chance inject dependencies.