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diff --git a/web/modules/contrib/memcache/src/Invalidator/TimestampInvalidatorInterface.php b/web/modules/contrib/memcache/src/Invalidator/TimestampInvalidatorInterface.php
new file mode 100644
index 000000000..2621609cb
--- /dev/null
+++ b/web/modules/contrib/memcache/src/Invalidator/TimestampInvalidatorInterface.php
@@ -0,0 +1,61 @@
+<?php
+
+namespace Drupal\memcache\Invalidator;
+
+/**
+ * Interface TimestampInvalidatorInterface.
+ *
+ * Defines an interface for timestamp-based tag invalidation.
+ *
+ * @package Drupal\memcache\Invalidator
+ */
+interface TimestampInvalidatorInterface {
+
+  /**
+   * Invalidate the timestamp of a tag.
+   *
+   * @param string $tag
+   *   Tag to invalidate.
+   *
+   * @return float
+   *   New timestamp of tag.
+   */
+  public function invalidateTimestamp($tag);
+
+  /**
+   * Get the last invalidation timestamp of a tag.
+   *
+   * @param string $tag
+   *   Tag to check.
+   *
+   * @return float
+   *   The last invalidation timestamp of the tag.
+   */
+  public function getLastInvalidationTimestamp($tag);
+
+  /**
+   * Get the last invalidation timestamps of a set of tags.
+   *
+   * @param array $tags
+   *   Array of tags to check (keys are ignored.)
+   *
+   * @return array|bool
+   *   The last invalidation timestamps on file, or FALSE on failure.
+   */
+  public function getLastInvalidationTimestamps(array $tags);
+
+  /**
+   * Get the current timestamp, optionally offset by a number.
+   *
+   * The standard granularity of the resulting timestamp is three decimal
+   * places, (1 millisecond).
+   *
+   * @param float $offset
+   *   Offset to apply to timestamp before rounding.
+   *
+   * @return float
+   *   Current timestamp in decimal seconds.
+   */
+  public function getCurrentTimestamp($offset = 0.0);
+
+}