reworked the Mediator pattern

Behavioral/Mediator/ConcreteMediator.php

@@ -1,47 +0,0 @@
-<?php declare(strict_types=1);
-
-namespace DesignPatterns\Behavioral\Mediator;
-
-class ConcreteMediator implements Mediator
-{
-    /**
-     * @var Subsystem\Server
-     */
-    private $server;
-
-    /**
-     * @var Subsystem\Database
-     */
-    private $database;
-
-    /**
-     * @var Subsystem\Client
-     */
-    private $client;
-
-    public function __construct(Subsystem\Database $database, Subsystem\Client $client, Subsystem\Server $server)
-    {
-        $this->database = $database;
-        $this->server = $server;
-        $this->client = $client;
-
-        $this->database->setMediator($this);
-        $this->server->setMediator($this);
-        $this->client->setMediator($this);
-    }
-
-    public function makeRequest()
-    {
-        $this->server->process();
-    }
-
-    public function queryDb(): string
-    {
-        return $this->database->getData();
-    }
-
-    public function sendResponse(string $content)
-    {
-        $this->client->output($content);
-    }
-}

Behavioral/Mediator/Mediator.php

@@ -4,9 +4,5 @@ namespace DesignPatterns\Behavioral\Mediator;
 
 interface Mediator
 {
-    public function sendResponse(string $content);
+    public function getUser(string $username): string;
-
-    public function makeRequest();
-
-    public function queryDb();
 }

Behavioral/Mediator/README.rst

@@ -30,33 +30,27 @@ Mediator.php
    :language: php
    :linenos:
 
-ConcreteMediator.php
-
-.. literalinclude:: ConcreteMediator.php
-   :language: php
-   :linenos:
-
 Colleague.php
 
 .. literalinclude:: Colleague.php
    :language: php
    :linenos:
 
-Subsystem/Client.php
+Ui.php
 
-.. literalinclude:: Subsystem/Client.php
+.. literalinclude:: Ui.php
    :language: php
    :linenos:
 
-Subsystem/Database.php
+UserRepository.php
 
-.. literalinclude:: Subsystem/Database.php
+.. literalinclude:: UserRepository.php
    :language: php
    :linenos:
 
-Subsystem/Server.php
+UserRepositoryUiMediator.php
 
-.. literalinclude:: Subsystem/Server.php
+.. literalinclude:: UserRepositoryUiMediator.php
    :language: php
    :linenos:
 

Behavioral/Mediator/Subsystem/Client.php

@@ -1,21 +0,0 @@
-<?php declare(strict_types=1);
-
-namespace DesignPatterns\Behavioral\Mediator\Subsystem;
-
-use DesignPatterns\Behavioral\Mediator\Colleague;
-
-/**
- * Client is a client that makes requests and gets the response.
- */
-class Client extends Colleague
-{
-    public function request()
-    {
-        $this->mediator->makeRequest();
-    }
-
-    public function output(string $content)
-    {
-        echo $content;
-    }
-}

Behavioral/Mediator/Subsystem/Database.php

@@ -1,13 +0,0 @@
-<?php declare(strict_types=1);
-
-namespace DesignPatterns\Behavioral\Mediator\Subsystem;
-
-use DesignPatterns\Behavioral\Mediator\Colleague;
-
-class Database extends Colleague
-{
-    public function getData(): string
-    {
-        return 'World';
-    }
-}

Behavioral/Mediator/Subsystem/Server.php

@@ -1,14 +0,0 @@
-<?php declare(strict_types=1);
-
-namespace DesignPatterns\Behavioral\Mediator\Subsystem;
-
-use DesignPatterns\Behavioral\Mediator\Colleague;
-
-class Server extends Colleague
-{
-    public function process()
-    {
-        $data = $this->mediator->queryDb();
-        $this->mediator->sendResponse(sprintf("Hello %s", $data));
-    }
-}

Behavioral/Mediator/Tests/MediatorTest.php

@@ -2,20 +2,18 @@
 
 namespace DesignPatterns\Tests\Mediator\Tests;
 
-use DesignPatterns\Behavioral\Mediator\ConcreteMediator;
+use DesignPatterns\Behavioral\Mediator\Ui;
-use DesignPatterns\Behavioral\Mediator\Subsystem\Client;
+use DesignPatterns\Behavioral\Mediator\UserRepository;
-use DesignPatterns\Behavioral\Mediator\Subsystem\Database;
+use DesignPatterns\Behavioral\Mediator\UserRepositoryUiMediator;
-use DesignPatterns\Behavioral\Mediator\Subsystem\Server;
 use PHPUnit\Framework\TestCase;
 
 class MediatorTest extends TestCase
 {
     public function testOutputHelloWorld()
     {
-        $client = new Client();
+        $mediator = new UserRepositoryUiMediator(new UserRepository(), new UI());
-        new ConcreteMediator(new Database(), $client, new Server());
 
-        $this->expectOutputString('Hello World');
+        $this->expectOutputString('User: Dominik');
-        $client->request();
+        $mediator->printInfoAbout('Dominik');
     }
 }

Behavioral/Mediator/Ui.php

@@ -0,0 +1,11 @@
+<?php declare(strict_types=1);
+
+namespace DesignPatterns\Behavioral\Mediator;
+
+class Ui extends Colleague
+{
+    public function outputUserInfo(string $username)
+    {
+        echo $this->mediator->getUser($username);
+    }
+}

Behavioral/Mediator/UserRepository.php

@@ -0,0 +1,11 @@
+<?php declare(strict_types=1);
+
+namespace DesignPatterns\Behavioral\Mediator;
+
+class UserRepository extends Colleague
+{
+    public function getUserName(string $user): string
+    {
+        return 'User: ' . $user;
+    }
+}

Behavioral/Mediator/UserRepositoryUiMediator.php

@@ -0,0 +1,35 @@
+<?php declare(strict_types=1);
+
+namespace DesignPatterns\Behavioral\Mediator;
+
+class UserRepositoryUiMediator implements Mediator
+{
+    /**
+     * @var UserRepository
+     */
+    private $userRepository;
+
+    /**
+     * @var Ui
+     */
+    private $ui;
+
+    public function __construct(UserRepository $userRepository, Ui $ui)
+    {
+        $this->userRepository = $userRepository;
+        $this->ui = $ui;
+
+        $this->userRepository->setMediator($this);
+        $this->ui->setMediator($this);
+    }
+
+    public function printInfoAbout(string $user)
+    {
+        $this->ui->outputUserInfo($user);
+    }
+
+    public function getUser(string $username): string
+    {
+        return $this->userRepository->getUserName($username);
+    }
+}