1 files changed, 73 insertions, 0 deletions
diff --git a/modules/system/system.queue.inc b/modules/system/system.queue.inc
index 5174a0a65..bac1ff26e 100644
--- a/modules/system/system.queue.inc
+++ b/modules/system/system.queue.inc
@@ -254,5 +254,78 @@ class SystemQueue implements DrupalQueueInterface {
 }
 
 /**
+ * Static queue implementation.
+ *
+ * This allows "undelayed" variants of processes relying on the Queue
+ * interface. The queue data resides in memory. It should only be used for
+ * items that will be queued and dequeued within a given page request.
+ */
+class MemoryQueue implements DrupalQueueInterface {
+  /**
+   * The queue data.
+   *
+   * @var array
+   */
+  protected $queue;
+
+  /**
+   * Counter for item ids.
+   *
+   * @var int
+   */
+  protected $id_sequence;
+
+  public function __construct($name) {
+    $this->queue = array();
+    $this->id_sequence = 0;
+  }
+
+  public function createItem($data) {
+    $item = new stdClass();
+    $item->item_id = $this->id_sequence++;
+    $item->data = $data;
+    $item->created = time();
+    $item->expire = 0;
+    $this->queue[$item->item_id] = $item;
+  }
+
+  public function numberOfItems() {
+    return count($this->queue);
+  }
+
+  public function claimItem($lease_time = 30) {
+    foreach ($this->queue as $key => $item) {
+      if ($item->expire == 0) {
+        $item->expire = time() + $lease_time;
+        $this->queue[$key] = $item;
+        return $item;
+      }
+    }
+    return FALSE;
+  }
+
+  public function deleteItem($item) {
+    unset($this->queue[$item->item_id]);
+  }
+
+  public function releaseItem($item) {
+    if (isset($this->queue[$item->item_id]) && $this->queue[$item->item_id]->expire != 0) {
+      $this->queue[$item->item_id]->expire = 0;
+      return TRUE;
+    }
+    return FALSE;
+  }
+
+  public function createQueue() {
+    // Nothing needed here.
+  }
+
+  public function deleteQueue() {
+    $this->queue = array();
+    $this->id_sequence = 0;
+  }
+}
+
+/**
  * @} End of "defgroup queue".
  */