zend framework2 - ZF2 SM, Do I really need to -

i have zf2 module needs access 3 database tables. no other module needs access these tables.

so question (performance in mind too, please) should add factories module.php have been doing:

/**  * service configuration  *  * @return array  */ public function getserviceconfig() {     return array(         'invokables' => array(             'login\service\authenticate' => 'login\service\authenticate',             'login\service\oauth'        => 'login\service\oauth'         ),         'factories'  => array(             'login\form\login'                   => function () {                 $form = new form\login();                 $form->setinputfilter(new formfilter\login());                  return $form;             },             'login\model\gaclemployeepermission' => function ($sm) {                 return new model\gaclemployeepermission($sm->get('otwebsoft\db\adapter\master'), $sm->get('otwebsoft\db\adapter\slave'));             },             'login\model\passport'               => function ($sm) {                 return new model\passport($sm->get('otwebsoft\db\adapter\master'), $sm->get('otwebsoft\db\adapter\slave'));             },             'login\model\passportlog'            => function ($sm) {                 return new model\passportlog($sm->get('otwebsoft\db\adapter\master'), $sm->get('otwebsoft\db\adapter\slave'));             }         )     ); } 

then have abstract class does:

/**  * table gaclemployeepermission  *  * @return \login\model\gaclemployeepermission  */ protected function gettablegaclemployeepermission() {     return $this->getservicemanager()->get('login\model\gaclemployeepermission'); } 

or should remove configuration module.php , in abstract class this:

/**  * table gaclemployeepermission  *  * @return \login\model\gaclemployeepermission  */ protected function gettablegaclemployeepermission() {     return new gaclemployeepermission($this->getmasteradapter(), $this->getslaveadapter()); } 

both seems work same. when comes performance, recommend? keeping in mind, these 3 tables not need accessed other module one.

the main reason use service manager or dependency injection container not other services access it. main reason apply dependency injection , thereby apply inversion of control. ease usage of objects, allow swap implementations easily, enhance ability test class , keep class responsible contained logic , not bothering dependencies.

in both examples, use service manager it's still same pattern: class (inside gettablegaclemployeepermission()) decides get. either via service manager or via direct instantiation, not matter much.

by module configuration cannot grasp layers have in application , (esp. what's abstract class), in general, should inject it's dependencies:

abstract class someabstract {     protected $permission;      public function __construct(permission $permission)     {         $this->permission = $permission;     } }  class permission {     protected $master;     protected $slave;      public function __construct(tableadapter $master, tableadapter $slave = null)     {         $this->master = $master;          if (null !== $slave) {             $this->slave = $slave;         }     } } 

then create service manager configuration inject dependencies services define:

'factories' => array(     'login\model\permission' => function ($sl) {         $master = $sl->get('my\masteradapter');          $slave  = null;         if ($some_flag) {             $slave = $sl->get('my\slaveadapter');         }          return new login\model\permission($master, $slave);     },      'login\some\concreteimplementation' => function ($sl) {         $permission = $sl->get('login\model\permission');          return new login\some\concreteimplementation($permission);     } ), 

then request login\some\concreteimplementation , injection ($master, $slave , $permission) done you, enabling benefits described above.