varnish-8.x-1.x-dev/src/Cache/VarnishBackend.php

<?php

namespace Drupal\varnish\Cache;

use Drupal\Core\Cache\Cache;
use Drupal\Core\Cache\CacheBackendInterface;

class VarnishBackend implements CacheBackendInterface{

  protected $bin;

  /**
   * Constructs a VarnishBackend object.
   *
   * @param string $bin
   *   The cache bin for which the object is created.
   */
  function __construct($bin) {
    $this->bin = $bin;
  }


  /**
   * {@inheritdoc}
   */
  public function get($cid, $allow_invalid = FALSE) {
    return FALSE;
  }

  /**
   * {@inheritdoc}
   */
  public function getMultiple(&$cids, $allow_invalid = FALSE) {
    return [];
  }

  /**
   * {@inheritdoc}
   */
  public function set($cid, $data, $expire = Cache::PERMANENT, array $tags = []) {}

  /**
   * {@inheritdoc}
   */
  public function setMultiple(array $items) {}

  /**
   * {@inheritdoc}
   */
  public function delete($cid) {
    $this->deleteMultiple([$cid]);
  }

  /**
   * {@inheritdoc}
   */
  public function deleteMultiple(array $cids) {
    $test = 'test';
  }

  /**
   * {@inheritdoc}
   */
  public function deleteTags(array $tags) {
    $tag_cache = &drupal_static('Drupal\Core\Cache\CacheBackendInterface::tagCache', []);
    $deleted_tags = &drupal_static('Drupal\Core\Cache\DatabaseBackend::deletedTags', []);
    foreach ($tags as $tag) {
      // Only delete tags once per request unless they are written again.
      if (isset($deleted_tags[$tag])) {
        continue;
      }
      $deleted_tags[$tag] = TRUE;
      unset($tag_cache[$tag]);

    }
  }

  /**
   * {@inheritdoc}
   */
  public function deleteAll() {
    $test = 'test';
  }

  /**
   * {@inheritdoc}
   */
  public function invalidate($cid) {
    $this->invalidateMultiple([$cid]);
  }

  /**
   * {@inheritdoc}
   */
  public function invalidateMultiple(array $cids) {
    $test = 'test';
  }

  /**
   * {@inheritdoc}
   */
  public function invalidateTags(array $tags) {
    $tag_cache = &drupal_static('Drupal\Core\Cache\CacheBackendInterface::tagCache', []);
    $invalidated_tags = &drupal_static('Drupal\Core\Cache\DatabaseBackend::invalidatedTags', []);
    foreach ($tags as $tag) {
      // Only invalidate tags once per request unless they are written again.
      if (isset($invalidated_tags[$tag])) {
        continue;
      }
      $invalidated_tags[$tag] = TRUE;
      unset($tag_cache[$tag]);

    }
  }


  /**
   * {@inheritdoc}
   */
  public function invalidateAll() {
    $test = 'test';
  }

  /**
   * {@inheritdoc}
   */
  public function garbageCollection() {}

  /**
   * {@inheritdoc}
   */
  public function removeBin(){}

}