--- /dev/null
+<?php
+
+namespace Drupal\{{ machine_name }}\Plugin\Menu;
+
+use Drupal\Core\Database\Connection;
+use Drupal\Core\Menu\MenuLinkDefault;
+use Drupal\Core\Menu\StaticMenuLinkOverridesInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * A menu link that displays count of messages.
+ */
+class {{ class }} extends MenuLinkDefault {
+
+ /**
+ * The database connection.
+ *
+ * @var \Drupal\Core\Database\Connection
+ */
+ protected $dbConnection;
+
+ /**
+ * Constructs the plugin object.
+ *
+ * @param array $configuration
+ * A configuration array containing information about the plugin instance.
+ * @param string $plugin_id
+ * The plugin_id for the plugin instance.
+ * @param mixed $plugin_definition
+ * The plugin implementation definition.
+ * @param \Drupal\Core\Menu\StaticMenuLinkOverridesInterface $static_override
+ * The static override storage.
+ * @param \Drupal\Core\Database\Connection $db_connection
+ * The database connection.
+ */
+ public function __construct(array $configuration, $plugin_id, $plugin_definition, StaticMenuLinkOverridesInterface $static_override, Connection $db_connection) {
+ parent::__construct($configuration, $plugin_id, $plugin_definition, $static_override);
+ $this->dbConnection = $db_connection;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
+ return new static(
+ $configuration,
+ $plugin_id,
+ $plugin_definition,
+ $container->get('menu_link.static.overrides'),
+ $container->get('database')
+ );
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getTitle() {
+ $count = $this->dbConnection->query('SELECT COUNT(*) FROM {messages}')->fetchField();
+ return $this->t('Messages (@count)', ['@count' => $count]);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getRouteName() {
+ return '{{ machine_name }}.messages';
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getCacheTags() {
+ // @DCG Invalidate this tags when messages are created or removed.
+ return ['{{ machine_name }}.messages_count'];
+ }
+
+}