From fc9401f04a3aca5abb22f87ebc210de8afe11d32 Mon Sep 17 00:00:00 2001
From: marvin-borner@live.com
Date: Tue, 10 Apr 2018 21:50:16 +0200
Subject: Initial Commit

---
 .../vendor/react/promise/src/CancellationQueue.php | 55 ++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 assets/php/vendor/react/promise/src/CancellationQueue.php

(limited to 'assets/php/vendor/react/promise/src/CancellationQueue.php')

diff --git a/assets/php/vendor/react/promise/src/CancellationQueue.php b/assets/php/vendor/react/promise/src/CancellationQueue.php
new file mode 100644
index 0000000..a366994
--- /dev/null
+++ b/assets/php/vendor/react/promise/src/CancellationQueue.php
@@ -0,0 +1,55 @@
+<?php
+
+namespace React\Promise;
+
+class CancellationQueue
+{
+    private $started = false;
+    private $queue = [];
+
+    public function __invoke()
+    {
+        if ($this->started) {
+            return;
+        }
+
+        $this->started = true;
+        $this->drain();
+    }
+
+    public function enqueue($cancellable)
+    {
+        if (!method_exists($cancellable, 'then') || !method_exists($cancellable, 'cancel')) {
+            return;
+        }
+
+        $length = array_push($this->queue, $cancellable);
+
+        if ($this->started && 1 === $length) {
+            $this->drain();
+        }
+    }
+
+    private function drain()
+    {
+        for ($i = key($this->queue); isset($this->queue[$i]); $i++) {
+            $cancellable = $this->queue[$i];
+
+            $exception = null;
+
+            try {
+                $cancellable->cancel();
+            } catch (\Throwable $exception) {
+            } catch (\Exception $exception) {
+            }
+
+            unset($this->queue[$i]);
+
+            if ($exception) {
+                throw $exception;
+            }
+        }
+
+        $this->queue = [];
+    }
+}
-- 
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