init commit

addons/wdsxh/library/alibabacloud/darabonba/src/RetryPolicy/RandomBackoffPolicy.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace AlibabaCloud\Dara\RetryPolicy;
+
+use AlibabaCloud\Dara\Exception\DaraException;
+use AlibabaCloud\Dara\RetryPolicy\BackoffPolicy;
+
+
+class RandomBackoffPolicy extends BackoffPolicy {
+    private $period;
+    private $cap;
+
+    public function __construct(array $option) {
+        parent::__construct($option);
+        if (!isset($option['period'])) {
+            throw new DaraException([], "Period must be specified.");
+        }
+        $this->period = $option['period'];
+        $this->cap = isset($option['cap']) ? $option['cap'] : 20000;
+    }
+
+    public function getDelayTime($ctx) {
+        $randomTime = mt_rand(0, $ctx->getRetryCount() * $this->period);
+        return ($randomTime > $this->cap) ? $this->cap : $randomTime;
+    }
+}