php - Facade design pattern, get attribute from facade -

i have facade design pattern in application. can start this: http://www.patternsforphp.org/doku.php?id=facade

from example:
facade = computer
parts: cpu, memory...

and solution situation: computer has id. of parts need not know computer id, there several parts, communicate world, eg. network card, need know computer id in placed.

what - best solution?
replies.

if understand want this: need send computerid specific part, when create specific part , store private in object. in networkdrive. after can use computerid want.

class cpu {     public function freeze() { /* ... */ }     public function jump( $position ) { /* ... */ }     public function execute() { /* ... */ }  }  class memory {     public function load( $position, $data ) { /* ... */ } }  class harddrive {     public function read( $lba, $size ) { /* ... */ } }  class networkdrive {      private $computerid;       public function __construct($id)      {          $this->computerid = $id;      }       public function send() { echo $this->computerid; }  }  /* facade */ class computer {     protected $cpu = null;     protected $memory = null;     protected $harddrive = null;     protected $networkdrive = null;     private $id = 534;      public function __construct()     {         $this->cpu = new cpu();         $this->memory = new memory();         $this->harddrive = new harddrive();         $this->networkdrive = new networkdrive($this->id);     }      public function startcomputer()     {         $this->cpu->freeze();         $this->memory->load( boot_address, $this->harddrive->read( boot_sector, sector_size ) );         $this->cpu->jump( boot_address );         $this->cpu->execute();         $this->networkdrive->send();     } }  /* client */ $facade = new computer(); $facade->startcomputer(); 

you can use observer pattern notify networkdrive object eventual changing of computerid