commit 899c89645555c46400801beecffdfac80a57c0cc
Author: Oliver Davies <oliver@oliverdavies.uk>
Date:   Wed Jan 9 14:13:07 2019 +0000

    Initial commit

diff --git a/README.md b/README.md
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+# Autowire Example
+
+An example module to demonstrate autowiring service classes in Drupal 8, as
+well as how to define Controllers as Services.
diff --git a/autowire_example.info.yml b/autowire_example.info.yml
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+name: 'Autowire Example'
+type: module
+description: 'An example module to demonstrate autowiring in Drupal 8.'
+core: 8.x
+package: 'Example modules'
diff --git a/autowire_example.routing.yml b/autowire_example.routing.yml
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+++ b/autowire_example.routing.yml
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+autowire_example.user_count:
+  path: '/user-count'
+  defaults:
+    _controller: 'Drupal\autowire_example\Controller\ExampleController::__invoke'
+  requirements:
+    _access: 'TRUE'
diff --git a/autowire_example.services.yml b/autowire_example.services.yml
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+services:
+  Drupal\autowire_example\Service\UserCounter:
+    autowire: true
+
+  Drupal\autowire_example\Controller\ExampleController:
+    autowire: true
diff --git a/src/Controller/ExampleController.php b/src/Controller/ExampleController.php
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+++ b/src/Controller/ExampleController.php
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+<?php
+
+namespace Drupal\autowire_example\Controller;
+
+use Drupal\autowire_example\Service\UserCounter;
+use Drupal\Core\StringTranslation\StringTranslationTrait;
+
+/**
+ * An example controller.
+ */
+class ExampleController {
+
+  use StringTranslationTrait;
+
+  /**
+   * The user counter service.
+   *
+   * @var \Drupal\autowire_example\Service\UserCounter
+   */
+  private $userCounter;
+
+  /**
+   * ExampleController constructor.
+   *
+   * @param \Drupal\autowire_example\Service\UserCounter $user_counter
+   *   The user counter service.
+   */
+  public function __construct(UserCounter $user_counter) {
+    $this->userCounter = $user_counter;
+  }
+
+  /**
+   * Display the username of the current user.
+   *
+   * @return array
+   *   A render array.
+   */
+  public function __invoke() {
+    return [
+      '#markup' => $this->formatPlural(
+        number_format($this->userCounter->getActiveUserCount()),
+        'This site has 1 active user.',
+        'This site has @count active users.'
+      )
+    ];
+  }
+  
+}
diff --git a/src/Service/UserCounter.php b/src/Service/UserCounter.php
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+++ b/src/Service/UserCounter.php
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+<?php
+
+namespace Drupal\autowire_example\Service;
+
+use Drupal\Core\Entity\EntityTypeManagerInterface;
+
+/**
+ * A service to count users.
+ */
+class UserCounter {
+
+  /**
+   * The user storage instance.
+   *
+   * @var \Drupal\Core\Entity\EntityStorageInterface
+   */
+  private $userStorage;
+
+  /**
+   * UserCounter constructor.
+   *
+   * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
+   *   The entity type manager.
+   *
+   * @throws \Drupal\Component\Plugin\Exception\InvalidPluginDefinitionException
+   * @throws \Drupal\Component\Plugin\Exception\PluginNotFoundException
+   */
+  public function __construct(EntityTypeManagerInterface $entity_type_manager) {
+    $this->userStorage = $entity_type_manager->getStorage('user');
+  }
+
+  /**
+   * Count the active users.
+   *
+   * @return integer
+   *   The number of active users.
+   */
+  public function getActiveUserCount() {
+    return (int) $this->userStorage
+      ->getQuery()
+      ->condition('status', 1)
+      ->count()
+      ->execute();
+  }
+
+}