Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/forum/src/Breadcrumb/ForumBreadcrumbBuilderBase.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\forum\Breadcrumb\ForumBreadcrumbBuilderBase.
+ */
+
+namespace Drupal\forum\Breadcrumb;
+
+use Drupal\Core\Breadcrumb\BreadcrumbBuilderInterface;
+use Drupal\Core\Config\ConfigFactoryInterface;
+use Drupal\Core\Entity\EntityManagerInterface;
+use Drupal\Core\Link;
+use Drupal\Core\Routing\RouteMatchInterface;
+use Drupal\Core\StringTranslation\StringTranslationTrait;
+use Drupal\forum\ForumManagerInterface;
+
+/**
+ * Provides a forum breadcrumb base class.
+ *
+ * This just holds the dependency-injected config, entity manager, and forum
+ * manager objects.
+ */
+abstract class ForumBreadcrumbBuilderBase  implements BreadcrumbBuilderInterface {
+  use StringTranslationTrait;
+
+  /**
+   * Configuration object for this builder.
+   *
+   * @var \Drupal\Core\Config\Config
+   */
+  protected $config;
+
+  /**
+   * The entity manager.
+   *
+   * @var \Drupal\Core\Entity\EntityManagerInterface
+   */
+  protected $entityManager;
+
+  /**
+   * The forum manager service.
+   *
+   * @var \Drupal\forum\ForumManagerInterface
+   */
+  protected $forumManager;
+
+  /**
+   * Constructs a forum breadcrumb builder object.
+   *
+   * @param \Drupal\Core\Entity\EntityManagerInterface $entity_manager
+   *   The entity manager.
+   * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
+   *   The configuration factory.
+   * @param \Drupal\forum\ForumManagerInterface $forum_manager
+   *   The forum manager service.
+   */
+  public function __construct(EntityManagerInterface $entity_manager, ConfigFactoryInterface $config_factory, ForumManagerInterface $forum_manager) {
+    $this->entityManager = $entity_manager;
+    $this->config = $config_factory->get('forum.settings');
+    $this->forumManager = $forum_manager;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function build(RouteMatchInterface $route_match) {
+    $breadcrumb[] = Link::createFromRoute($this->t('Home'), '<front>');
+
+    $vocabulary = $this->entityManager
+      ->getStorage('taxonomy_vocabulary')
+      ->load($this->config->get('vocabulary'));
+    $breadcrumb[] = Link::createFromRoute($vocabulary->label(), 'forum.index');
+
+    return $breadcrumb;
+  }
+
+}

core/modules/forum/src/Breadcrumb/ForumListingBreadcrumbBuilder.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\forum\Breadcrumb\ForumListingBreadcrumbBuilder.
+ */
+
+namespace Drupal\forum\Breadcrumb;
+
+use Drupal\Core\Link;
+use Drupal\Core\Routing\RouteMatchInterface;
+
+/**
+ * Provides a breadcrumb builder base class for forum listing pages.
+ */
+class ForumListingBreadcrumbBuilder extends ForumBreadcrumbBuilderBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function applies(RouteMatchInterface $route_match) {
+    return $route_match->getRouteName() == 'forum.page' && $route_match->getParameter('taxonomy_term');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function build(RouteMatchInterface $route_match) {
+    $breadcrumb = parent::build($route_match);
+
+    // Add all parent forums to breadcrumbs.
+    $term_id = $route_match->getParameter('taxonomy_term')->id();
+    $parents = $this->forumManager->getParents($term_id);
+    if ($parents) {
+      foreach (array_reverse($parents) as $parent) {
+        if ($parent->id() != $term_id) {
+          $breadcrumb[] = Link::createFromRoute($parent->label(), 'forum.page', array(
+            'taxonomy_term' => $parent->id(),
+          ));
+        }
+      }
+    }
+    return $breadcrumb;
+  }
+
+}

core/modules/forum/src/Breadcrumb/ForumNodeBreadcrumbBuilder.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\forum\Breadcrumb\ForumNodeBreadcrumbBuilder.
+ */
+
+namespace Drupal\forum\Breadcrumb;
+
+use Drupal\Core\Link;
+use Drupal\Core\Routing\RouteMatchInterface;
+
+/**
+ * Breadcrumb builder for forum nodes.
+ */
+class ForumNodeBreadcrumbBuilder extends ForumBreadcrumbBuilderBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function applies(RouteMatchInterface $route_match) {
+    return $route_match->getRouteName() == 'entity.node.canonical'
+      && $route_match->getParameter('node')
+      && $this->forumManager->checkNodeType($route_match->getParameter('node'));
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function build(RouteMatchInterface $route_match) {
+    $breadcrumb = parent::build($route_match);
+
+    $parents = $this->forumManager->getParents($route_match->getParameter('node')->forum_tid);
+    if ($parents) {
+      $parents = array_reverse($parents);
+      foreach ($parents as $parent) {
+        $breadcrumb[] = Link::createFromRoute($parent->label(), 'forum.page',
+          array(
+            'taxonomy_term' => $parent->id(),
+          )
+        );
+      }
+    }
+    return $breadcrumb;
+  }
+
+}