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+# Facades Meta Document
+
+## 1. Summary
+
+The facade pattern (also spelled façade) is a software-design pattern commonly used in object-oriented programming.
+Analogous to a facade in architecture, a facade is an object that serves as a front-facing interface masking more
+complex underlying or structural code. A facade can:
+
+* improve the readability and usability of a software library by masking interaction with more complex components behind
+  a single (and often simplified) API
+* provide a context-specific interface to more generic functionality (complete with context-specific input validation)
+* serve as a launching point for a broader refactor of monolithic or tightly-coupled systems in favor of more
+  loosely-coupled code
+
+Developers often use the facade design pattern when a system is very complex or difficult to understand because the
+system has many interdependent classes or because its source code is unavailable. This pattern hides the complexities of
+the larger system and provides a simpler interface to the client. It typically involves a single wrapper class that
+contains a set of members required by the client. These members access the system on behalf of the facade client and
+hide the implementation details. [[Wikipedia: Facade Pattern](https://en.wikipedia.org/wiki/Facade_pattern)]
+
+## 2. Why Bother?
+
+In Joomla, we have lots of places with code like this:
+
+```php
+$this->app->getIdentity()->authorise(...)
+```
+
+or
+
+```php
+Factory::getUser()->authorise(...);
+```
+
+While `Factory::getUser()` is deprecated, `$this->app->getIdentity()` relies on knowledge about the internal structure.
+Being able to use
+
+```php
+User::authorise(...);
+```
+
+instead, would lower the cognitive load a lot. Additionally, it would make it easier for us to make changes in the
+underlying code without breaking extensions that use the feature in question.
+`authorise()` is just a single example here; there are several other places, where the facade pattern would simplify our lives:
+
+* App(lication)
+* Auth(orisation)
+* Config
+* Session
+* Lang(uage)
+* Doc(ument)
+* Database
+* Mail(er)
+* Event
+* Log(ger)
+
+## 3. Scope
+
+### 3.1 Goals
+
+### 3.2 Non-Goals
+
+## 4. Approaches
+
+### 4.1 Composite Pattern
+
+### 4.2 Chosen Approach
+
+## 5. Design Decisions
+
+## 6. People
+
+### 6.1 Editor(s)
+
+* Niels Braczek, <nbraczek@bsds.de>
+
+### 6.2 Sponsors
+
+* N/A
+
+### 6.3 Contributors
+
+* N/A
+
+## 7. Votes
+
+* **Entrance Vote:** _(not yet taken)_
+* **Acceptance Vote:** _(not yet taken)_
+
+## 8. Relevant Links
+
+_**Note:** Order descending chronologically._
+
+## 9. Errata
+
+...
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+# Content Elements
+
+
+The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD",
+"SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be
+interpreted as described in [RFC 2119][].
+
+[RFC 2119]: http://tools.ietf.org/html/rfc2119
+
+### References
+
+- [RFC 2119][]: Key words for use in RFCs to Indicate Requirement Levels
+
+## 1. Specification
+
+### 1.1 Facade
+
+### 1.2 Application
+
+```php
+<?php
+
+namespace Joomla\Facade;
+
+use \Joomla\CMS\Application\CMSApplicationInterface;
+use Joomla\CMS\Factory;
+
+class App extends Facade
+{
+    /**
+     * @var \Joomla\CMS\Application\CMSApplicationInterface
+     */
+    static private $instance;
+
+    use Mockable;
+
+    /**
+     * Get the root object behind the facade.
+     *
+     * @return \Joomla\CMS\Application\CMSApplicationInterface
+     */
+    public static function getFacadeRoot(): CMSApplicationInterface
+    {
+        if (self::$isMock) {
+            return self::$mock;
+        }
+
+        if (self::$instance === null) {
+            self::$instance = Factory::getApplication();
+        }
+
+        return self::$instance;
+    }
+}
+```
+
+### 1.3 Content Visitor
+
+## 2. Interfaces, Traits and Classes
+
+### 2.1 Joomla\Facade\Facade
+
+```php
+<?php
+
+namespace Joomla\Facade;
+
+use RuntimeException;
+
+abstract class Facade
+{
+    /**
+     * Get the root object behind the facade.
+     */
+    abstract public static function getFacadeRoot();
+
+    /**
+     * Handle dynamic, static calls to the object.
+     *
+     * @param string $method
+     * @param array  $args
+     *
+     * @return mixed
+     *
+     * @throws RuntimeException
+     */
+    public static function __callStatic(string $method, array $args)
+    {
+        $instance = static::getFacadeRoot();
+        if (!$instance) {
+            throw new RuntimeException('A facade root has not been set.');
+        }
+
+        return $instance->$method(...$args);
+    }
+}
+```
+
+### 2.2 Joomla\Facade\Mockable
+
+```php
+<?php
+
+namespace Joomla\Facade;
+
+trait Mockable
+{
+    protected static $isMock = false;
+
+    protected static $mock;
+
+    /**
+     * @param $mock
+     */
+    public static function setMock($mock): void
+    {
+        self::$mock   = $mock;
+        self::$isMock = true;
+    }
+}
+```