From 1c143360ca5fbb5d72246e37652fa07cc9502f9f Mon Sep 17 00:00:00 2001
From: Jeremiah VALERIE <jeremiah@over-blog.com>
Date: Fri, 18 Aug 2017 16:18:48 +0200
Subject: [PATCH] Add hooks to helps promise completion with custom backend

---
 .../Promise/Adapter/SyncPromiseAdapter.php    | 20 +++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/src/Executor/Promise/Adapter/SyncPromiseAdapter.php b/src/Executor/Promise/Adapter/SyncPromiseAdapter.php
index 35341b3..44ddf66 100644
--- a/src/Executor/Promise/Adapter/SyncPromiseAdapter.php
+++ b/src/Executor/Promise/Adapter/SyncPromiseAdapter.php
@@ -126,6 +126,7 @@ class SyncPromiseAdapter implements PromiseAdapter
      */
     public function wait(Promise $promise)
     {
+        $this->beforeWait($promise);
         $dfdQueue = Deferred::getQueue();
         $promiseQueue = SyncPromise::getQueue();
 
@@ -135,6 +136,7 @@ class SyncPromiseAdapter implements PromiseAdapter
         ) {
             Deferred::runQueue();
             SyncPromise::runQueue();
+            $this->onWait($promise);
         }
 
         /** @var SyncPromise $syncPromise */
@@ -148,4 +150,22 @@ class SyncPromiseAdapter implements PromiseAdapter
 
         throw new InvariantViolation("Could not resolve promise");
     }
+
+    /**
+     * Execute just before starting to run promise completion
+     *
+     * @param Promise $promise
+     */
+    protected function beforeWait(Promise $promise)
+    {
+    }
+
+    /**
+     * Execute while running promise completion
+     *
+     * @param Promise $promise
+     */
+    protected function onWait(Promise $promise)
+    {
+    }
 }