Move custom libs to the source tree

libs/SimpleQueue/QueueAdapterInterface.php

@@ -0,0 +1,58 @@
+<?php
+
+namespace SimpleQueue;
+
+use DateTime;
+
+/**
+ * Interface AdapterInterface
+ *
+ * @package SimpleQueue\Adapter
+ */
+interface QueueAdapterInterface
+{
+    /**
+     * Send a job
+     *
+     * @access public
+     * @param  Job $job
+     * @return $this
+     */
+    public function push(Job $job);
+
+    /**
+     * Schedule a job in the future
+     *
+     * @access public
+     * @param  Job      $job
+     * @param  DateTime $dateTime
+     * @return $this
+     */
+    public function schedule(Job $job, DateTime $dateTime);
+
+    /**
+     * Wait and get job from a queue
+     *
+     * @access public
+     * @return Job|null
+     */
+    public function pull();
+
+    /**
+     * Acknowledge a job
+     *
+     * @access public
+     * @param  Job $job
+     * @return $this
+     */
+    public function completed(Job $job);
+
+    /**
+     * Mark a job as failed
+     *
+     * @access public
+     * @param  Job $job
+     * @return $this
+     */
+    public function failed(Job $job);
+}