JDay Deutschland 2015 - PHP Design Patterns in Joomla!
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PHP Design Patterns in Joomla! @yveshoppe
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Transcript of JDay Deutschland 2015 - PHP Design Patterns in Joomla!
PHP Design Patternsin Joomla!
@yveshoppe
Was sind Design Patterns?
Allgemein anerkannte Lösungen für
wiederkehrende Probleme
Anti Patterns
$_REQUEST anstelle von JInput
Reinventing the square wheel
Mambo / Joomla 1.0
Ball of Mud
Als Stackoverflow einen Tag nicht erreichbar war sank die Produktivität um 80 %!
Copy & Paste
Perfekte Lösungen für eine nicht perfekte Welt!
Overengineering
Ein Objekt welche alle Aufgaben und Daten in sich vereint.
God Object
Entwurfsmuster, Antimuster, abstrakte Fabrik, Schablonenmethode,
Fliegengewicht, Gasfabrik, Wunderwaffe
Translating Design Patterns into German!
Quelle: Wikipedia.de
Geschichte der Design Patterns
Gang of Four (1994)
Erich Gamma
Ralph Johnson
Richard Helm
John Vlissides
23 Design Patterns
in Kategorien
Einteilung von Design Patterns
$bla = JFilterInput::getInstance()->clean($bla);$db = JFactory::getDbo();
Creational Patterns
Bridge Pattern (Ouptut raw, html, component, feed)
Structual Patterns
JTableObserverContenthistory::createObserver($this, array('typeAlias' => 'com_tags.tag'));
Behavioral Patterns
Revisions / Versions in Joomla 3.x!
Observer Pattern
Tag History
Observer Pattern
Speichern
interface JObserverInterface{
public static function createObserver ( JObservableInterface $observableObject, $params = array());
}
libraries/joomla/observer/interface.php
abstract class JTableObserver implements JObserverInterface
{public function __construct(JTableInterface $table){ $table->attachObserver($this);..}
public function onAfterStore(&$result){}
}
libraries/joomla/table/observer.php
class JTableObserverContenthistory extends JTableObserver{
public static function createObserver(JObservableInterface $observableObject, $params = array())
{$typeAlias = $params['typeAlias'];$observer = new self($observableObject);$observer->contenthistoryHelper = ..;
return $observer;}
public function onAfterStore(&$result){
..$this->contenthistoryHelper->store($this->table);
}
libraries/joomla/table/observer/contenthistory.php
class TagsTableTag extends JTableNested{
public function __construct($db){
parent::__construct('#__tags', 'id', $db);
JTableObserverContenthistory::createObserver($this, array('typeAlias' => 'com_tags.tag'));
}
libraries/joomla/observer/interface.php
Model View Controller Pattern
Observer, Composite und Strategy Pattern vereint.
MVC Schema
Verarbeitung von Aufgaben (tasks) und Events
Controller
class ContentControllerArticle extends JControllerForm{
public function save($key = null, $urlVar = null){
$model = $this->getModel();$table = $model->getTable();
.. $model->save($validData)
..$viewType = 'html';$view = $this->getView($viewName, $viewType, '', array('base_path'
=> $this->basePath, 'layout' => $viewLayout));
$view->display();
administrator/components/com_content/controllers/article.php
Stark vereinfacht!
Die Applikations-Logik (CRUD etc)
Model
class ContentModelArticle extends JModelAdmin{
public function save($data){
// Filtern, Aufräumen, Plugin Events und Co.
...$table = $this->getTable();
if (!$table->bind($data)){
$this->setError($table->getError());}
..// Speichern in der Datenbank.. ..
return true;
administrator/components/com_content/models/article.php
Die Ausgabeschicht (HTML, RAW, COMPONENT etc.)
View
class ContentViewArticle extends JViewLegacy{
public function display($tpl = null){
echo “Erfolgreich gespeichert..”;
administrator/components/com_content/views/article/view.html.php
JLoader::register('ContentHelper', JPATH_ADMINISTRATOR . '/components/com_content/helpers/content.php'
);
Auto-Loading (PSR)
(statt require(_once))
Warum JLoader?
Performance&
Einfachheit!
abstract class JLoader{
public static function setup($enablePsr = true, $enablePrefixes = true, $enableClasses = true){
..spl_autoload_register(array('JLoader', 'load'))spl_autoload_register(array('JLoader', 'loadByPsr0'));spl_autoload_register(array('JLoader', 'loadByAlias'));
libraries/loader.php
abstract class JLoader{
protected static $classes = array();
public static function register($class, $path, $force = true)
{..self::$classes[$class] = $path;
}
public static function discover($classPrefix, $parentPath, $force = true, $recurse = false)
{.. foreach ($iterator as $file)
self::register($class, $file->getPath() . '/' . $fileName);
libraries/loader.php
abstract class JLoader{
public static function load($class){
..include_once self::$classes[$class];
libraries/loader.php
JUpdater -> update($type)
Fragen?
Vielen Dank!
