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diff --git a/web/core/modules/aggregator/src/ItemsImporter.php b/web/core/modules/aggregator/src/ItemsImporter.php
new file mode 100644
index 000000000..aa18d65c9
--- /dev/null
+++ b/web/core/modules/aggregator/src/ItemsImporter.php
@@ -0,0 +1,153 @@
+<?php
+
+namespace Drupal\aggregator;
+
+use Drupal\aggregator\Plugin\AggregatorPluginManager;
+use Drupal\Component\Plugin\Exception\PluginException;
+use Drupal\Core\Config\ConfigFactoryInterface;
+use Psr\Log\LoggerInterface;
+
+/**
+ * Defines an importer of aggregator items.
+ */
+class ItemsImporter implements ItemsImporterInterface {
+
+  /**
+   * The aggregator fetcher manager.
+   *
+   * @var \Drupal\aggregator\Plugin\AggregatorPluginManager
+   */
+  protected $fetcherManager;
+
+  /**
+   * The aggregator processor manager.
+   *
+   * @var \Drupal\aggregator\Plugin\AggregatorPluginManager
+   */
+  protected $processorManager;
+
+  /**
+   * The aggregator parser manager.
+   *
+   * @var \Drupal\aggregator\Plugin\AggregatorPluginManager
+   */
+  protected $parserManager;
+
+  /**
+   * The aggregator.settings config object.
+   *
+   * @var \Drupal\Core\Config\Config
+   */
+  protected $config;
+
+  /**
+   * A logger instance.
+   *
+   * @var \Psr\Log\LoggerInterface
+   */
+  protected $logger;
+
+  /**
+   * Constructs an Importer object.
+   *
+   * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
+   *   The factory for configuration objects.
+   * @param \Drupal\aggregator\Plugin\AggregatorPluginManager $fetcher_manager
+   *   The aggregator fetcher plugin manager.
+   * @param \Drupal\aggregator\Plugin\AggregatorPluginManager $parser_manager
+   *   The aggregator parser plugin manager.
+   * @param \Drupal\aggregator\Plugin\AggregatorPluginManager $processor_manager
+   *   The aggregator processor plugin manager.
+   * @param \Psr\Log\LoggerInterface $logger
+   *   A logger instance.
+   */
+  public function __construct(ConfigFactoryInterface $config_factory, AggregatorPluginManager $fetcher_manager, AggregatorPluginManager $parser_manager, AggregatorPluginManager $processor_manager, LoggerInterface $logger) {
+    $this->fetcherManager = $fetcher_manager;
+    $this->processorManager = $processor_manager;
+    $this->parserManager = $parser_manager;
+    $this->config = $config_factory->get('aggregator.settings');
+    $this->logger = $logger;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function delete(FeedInterface $feed) {
+    foreach ($this->processorManager->getDefinitions() as $id => $definition) {
+      $this->processorManager->createInstance($id)->delete($feed);
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function refresh(FeedInterface $feed) {
+    // Store feed URL to track changes.
+    $feed_url = $feed->getUrl();
+
+    // Fetch the feed.
+    try {
+      $success = $this->fetcherManager->createInstance($this->config->get('fetcher'))->fetch($feed);
+    }
+    catch (PluginException $e) {
+      $success = FALSE;
+      watchdog_exception('aggregator', $e);
+    }
+
+    // Store instances in an array so we dont have to instantiate new objects.
+    $processor_instances = [];
+    foreach ($this->config->get('processors') as $processor) {
+      try {
+        $processor_instances[$processor] = $this->processorManager->createInstance($processor);
+      }
+      catch (PluginException $e) {
+        watchdog_exception('aggregator', $e);
+      }
+    }
+
+    // We store the hash of feed data in the database. When refreshing a
+    // feed we compare stored hash and new hash calculated from downloaded
+    // data. If both are equal we say that feed is not updated.
+    $hash = hash('sha256', $feed->source_string);
+    $has_new_content = $success && ($feed->getHash() != $hash);
+
+    if ($has_new_content) {
+      // Parse the feed.
+      try {
+        if ($this->parserManager->createInstance($this->config->get('parser'))->parse($feed)) {
+          if (!$feed->getWebsiteUrl()) {
+            $feed->setWebsiteUrl($feed->getUrl());
+          }
+          $feed->setHash($hash);
+          // Update feed with parsed data.
+          $feed->save();
+
+          // Log if feed URL has changed.
+          if ($feed->getUrl() != $feed_url) {
+            $this->logger->notice('Updated URL for feed %title to %url.', ['%title' => $feed->label(), '%url' => $feed->getUrl()]);
+          }
+
+          $this->logger->notice('There is new syndicated content from %site.', ['%site' => $feed->label()]);
+
+          // If there are items on the feed, let enabled processors process them.
+          if (!empty($feed->items)) {
+            foreach ($processor_instances as $instance) {
+              $instance->process($feed);
+            }
+          }
+        }
+      }
+      catch (PluginException $e) {
+        watchdog_exception('aggregator', $e);
+      }
+    }
+
+    // Processing is done, call postProcess on enabled processors.
+    foreach ($processor_instances as $instance) {
+      $instance->postProcess($feed);
+    }
+
+    return $has_new_content;
+  }
+
+}