1. Киев
15 сентября 2012
Magento DI

2. Software Entropy
Pull-approach and its problems
Push-approach
Magento Object Manager

3. Software entropy

4. Software entropy cycle

5. Pull-approach

6. Mage::getModel(“Mage_Cms_Model_Page”)
Mage::getSingleton(“Mage_Cms_Model_Page”)

7. class Mage_Cms_Model_Page
{
public function __construct()
{
$this->_idFieldName = Mage::getResourceSingleton($this->_resourceName);
}
public function getAvailableStatuses()
{
$statuses = new Varien_Object(array(
self::STATUS_ENABLED => Mage::helper('Mage_Cms_Helper_Data')->__('Enabled')
self::STATUS_DISABLED => Mage::helper('Mage_Cms_Helper_Data') ->__(„Disabled')
));
Mage::dispatchEvent('cms_page_get_available_statuses', array('statuses' => $statuses));
}
}

8. class Mage_Cms_Model_PageTest extends PHPUnit_Framework_TestCase
{
public function setUp()
{
$this->_page = new Mage_Cms_Model_Page();
}
}

9. class Mage_Cms_Model_PageTest extends PHPUnit_Framework_TestCase
{
public function setUp()
{
Mage::setResourceSingleton(„Page_Resource‟, $this->getMock(„Page_Resource‟));
$this->_page = new Mage_Cms_Model_Page();
}
public function testProcessDoesSomething()
{
Mage::setHelper(„Mage_Cms_Helper_Data‟, $this->getMock(„Mage_Cms_Helper_Data‟));
$this->assertSomething($this->_page->process());
}
}

10. Mage::getXXX() ===

11. Push-approach

12. class Mage_Core_Model_Abstract
{
public function __construct(array $data = array())
{
parent::__construct($data);
$this->_construct();
}
}

13. class Mage_Core_Model_Abstract
{
public function __construct(
Mage_Core_Model_Event_Manager $eventDispatcher,
Mage_Core_Model_Cache $cacheManager,
Mage_Core_Model_Resource_Abstract $resource = null,
Varien_Data_Collection_Db $resourceCollection = null,
array $data = array()
){
$this->_eventDispatcher = $eventDispatcher;
$this->_cacheManager = $cacheManager;
$this->_resource = $resource;
$this->_resourceCollection = $resourceCollection;
parent::__construct($data);
$this->__construct();
}
}

14. Mage::getXXX()
Mage_Some_Class::__construct()
Magento_ObjectManager

15. Magento Object Manager

16. interface Magento_ObjectManager
{
public function get($className, $arguments);
public function create($className, $arguments);
}

18. ZendDi

19. class Mage_Core_Model_Abstract
{
public function __construct(
Mage_Core_Model_Event_Manager $eventDispatcher,
Mage_Core_Model_Cache $cacheManager,
Mage_Core_Model_Resource_Abstract $resource = null,
Varien_Data_Collection_Db $resourceCollection = null,
array $data = array()
){
$this->_eventDispatcher = $eventDispatcher;
$this->_cacheManager = $cacheManager;
$this->_resource = $resource;
$this->_resourceCollection = $resourceCollection;
parent::__construct($data);
$this->__construct();
}
}

20. <config>
<global>
<di>
<Mage_Core_Model_Cache>
<parameters>
<cacheDir>/path/to/cache/dir</cacheDir>
</parameters>
</Mage_Core_Model_Cache>
</di>
</global>
</config>

21. <di>
<Magento_Data_Structure>
<shared>0</shared>
</Magento_Data_Structure>
</di>

22. public function __construct(Some_Interface $processor)

23. <adminhtml>
<di>
<preferences>
<Some_Interface>Some_Backend_Implementation</Some_Interface>
</preferences>
</di>
</adminhtml>
<api>
<di>
<preferences>
<Some_Interface>Some_Api_Implementation</Some_Interface>
</preferences>
</di>
</api>

24. INJECTABLES - NON-INJECTABLES
Varien_Db_Adapter
Mage_Catalog_Model_Product
Mage_Core_Model_Cache
Mage_Wishlist_Model_Wishlist
Mage_Core_Model_Config

25. class Varien_Data_Collection
{
//...
public function getNewEmptyItem()
{
return Mage::getModel($this->_itemObjectClass);
}
//...
}

26. class Varien_Data_Collection
{
public function __construct(Magento_ObjectFactory $factory)
{
$this->_itemFactory = $factory;
}
//...
public function getNewEmptyItem()
{
return $this->_itemFactory->create();
}
//...
}

27. class Mage_Catalog_Model_Product_Factory implements Magento_ObjectManager_Factory
{
protected $_objectManager;
public function __construct(Magento_ObjectManager $objectManager)
{
$this->_objectManager = $objectManager;
}
public function createFromArray(array $arguments = array())
{
return $this->_objectManager->create('Mage_Catalog_Model_Product', $arguments);
}
}

28. class Mage_Review_Model_Observer
{
public function processDeletedProduct (Varien_Event_Observer $observer)
{
$productId = $observer->getEvent()->getProduct()->getId();
if ($productId) {
Mage::getResourceSingleton('Mage_Review_Model_Resource_Review')
->deleteReviewsByProductId($productId);
}
}
}

29. class Mage_Review_Model_Observer
{
public function __construct(Mage_Review_Model_Resource_Review $review)
{
$this->_reviewResource = $reviewResource;
}
//...
}

30. <di>
<Mage_Review_Model_Observer>
<parameters>
<review>
Mage_Review_Model_Resource_Review_Proxy
</review>
</parameters>
</ Mage_Review_Model_Observer >
</di>

31. class Mage_Review_Model_Resource_Review_Proxy
extends Mage_Review_Model_Resource_Review
{
public function __construct(Magento_ObjectManager $objectManager)
{
$this->_objectManager = $objectManager;
}
public function deleteReviewByProductId($productId)
{
return $this->_objectManager
->get('Mage_Review_Model_Resource_Review ')
->deleteReviewByProductId();
}
}