3517626: Fix circular reference error when using modeler_api.

Closes #3517626

modules/ui/src/Plugin/modeler_api_model_owner/Eca.php

@@ -34,6 +34,15 @@ class Eca extends ModelOwnerBase {
     Api::COMPONENT_TYPE_ELEMENT => 'action',
   ];
 
+  /**
+   * Dependency Injection container.
+   *
+   * Used for getter injection.
+   *
+   * @var \Symfony\Component\DependencyInjection\ContainerInterface|null
+   */
+  protected ?ContainerInterface $container;
+
   /**
    * ECA events service.
    *
@@ -62,20 +71,6 @@ class Eca extends ModelOwnerBase {
    */
   protected ?string $documentationDomain;
 
-  /**
-   * {@inheritdoc}
-   */
-  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition): static {
-    $instance = parent::create($container, $configuration, $plugin_id, $plugin_definition);
-    $instance->eventsService = $container->get('eca.service.event');
-    $instance->conditionsService = $container->get('eca.service.condition');
-    $instance->actionsService = $container->get('eca.service.action');
-    $instance->documentationDomain = $container->getParameter('eca.default_documentation_domain') ?
-      $container->get('config.factory')->get('eca.settings')->get('documentation_domain') :
-      NULL;
-    return $instance;
-  }
-
   /**
    * {@inheritdoc}
    */
@@ -104,14 +99,77 @@ class Eca extends ModelOwnerBase {
     return '\Drupal\eca_ui\Form\Settings';
   }
 
+  /**
+   * Get Dependency Injection container.
+   *
+   * @return \Symfony\Component\DependencyInjection\ContainerInterface
+   *   Current Dependency Injection container.
+   */
+  protected function getContainer(): ContainerInterface {
+    if (!isset($this->container)) {
+      // @phpstan-ignore-next-line
+      $this->container = \Drupal::getContainer();
+    }
+    return $this->container;
+  }
+
+  /**
+   * ECA event plugins.
+   *
+   * @return \Drupal\eca\Service\Events
+   */
+  protected function eventsService(): Events {
+    if (!isset($this->eventsService)) {
+      $this->eventsService = $this->getContainer()->get('eca.service.event');
+    }
+    return $this->eventsService;
+  }
+
+  /**
+   * ECA condition plugins.
+   *
+   * @return \Drupal\eca\Service\Conditions
+   */
+  protected function conditionsService(): Conditions {
+    if (!isset($this->conditionsService)) {
+      $this->conditionsService = $this->getContainer()->get('eca.service.condition');
+    }
+    return $this->conditionsService;
+  }
+
+  /**
+   * Use the ECA event service.
+   *
+   * @return \Drupal\eca\Service\Actions
+   */
+  protected function actionsService(): Actions {
+    if (!isset($this->actionsService)) {
+      $this->actionsService = $this->getContainer()->get('eca.service.action');
+    }
+    return $this->actionsService;
+  }
+
+  protected function documentationDomain(): string|null {
+    if (!isset($this->documentationDomain)) {
+      $this->documentationDomain = $this->getContainer()
+        ->getParameter('eca.default_documentation_domain')
+        ? $this->getContainer()
+          ->get('config.factory')
+          ->get('eca.settings')
+          ->get('documentation_domain')
+        : NULL;
+    }
+    return $this->documentationDomain;
+  }
+
   /**
    * {@inheritdoc}
    */
   public function availableOwnerComponents(int $type): array {
     return match($type) {
-      Api::COMPONENT_TYPE_START => $this->eventsService->events(),
-      Api::COMPONENT_TYPE_CONDITION => $this->conditionsService->conditions(),
-      Api::COMPONENT_TYPE_ELEMENT => $this->actionsService->actions(),
+      Api::COMPONENT_TYPE_START => $this->eventsService()->events(),
+      Api::COMPONENT_TYPE_CONDITION => $this->conditionsService()->conditions(),
+      Api::COMPONENT_TYPE_ELEMENT => $this->actionsService()->actions(),
       default => [],
     };
   }
@@ -130,7 +188,7 @@ class Eca extends ModelOwnerBase {
     $form_state = new FormState();
     try {
       if ($plugin instanceof ActionInterface) {
-        $form = $this->actionsService->getConfigurationForm($plugin, $form_state) ?? [
+        $form = $this->actionsService()->getConfigurationForm($plugin, $form_state) ?? [
           'error_message' => [
             '#type' => 'checkbox',
             '#title' => $this->t('Error in configuration form!!!'),
@@ -160,7 +218,7 @@ class Eca extends ModelOwnerBase {
    * {@inheritdoc}
    */
   public function pluginDocUrl(PluginInspectionInterface $plugin, string $pluginType): ?string {
-    if (!($domain = $this->documentationDomain)) {
+    if (!($domain = $this->documentationDomain())) {
       return NULL;
     }
     $provider = $plugin->getPluginDefinition()['provider'];