From f091327bf9ac9088cc8fafe46d21e0faa00d686b Mon Sep 17 00:00:00 2001
From: Coleman Watts <coleman@civicrm.org>
Date: Tue, 26 Aug 2014 14:30:37 +0100
Subject: [PATCH] CRM-15156 - Clear cms resource cache during upgrade

---
 CRM/Core/Resources.php          | 2 ++
 CRM/Utils/System/Base.php       | 7 +++++++
 CRM/Utils/System/DrupalBase.php | 7 +++++++
 3 files changed, 16 insertions(+)

diff --git a/CRM/Core/Resources.php b/CRM/Core/Resources.php
index b1f0df1c90..876284a388 100644
--- a/CRM/Core/Resources.php
+++ b/CRM/Core/Resources.php
@@ -436,6 +436,8 @@ class CRM_Core_Resources {
 
   public function resetCacheCode() {
     $this->setCacheCode(CRM_Utils_String::createRandom(5, CRM_Utils_String::ALPHANUMERIC));
+    // Also flush cms resource cache if needed
+    CRM_Core_Config::singleton()->userSystem->clearResourceCache();
   }
 
   /**
diff --git a/CRM/Utils/System/Base.php b/CRM/Utils/System/Base.php
index a92882a41d..e52558d3b7 100644
--- a/CRM/Utils/System/Base.php
+++ b/CRM/Utils/System/Base.php
@@ -183,6 +183,13 @@ abstract class CRM_Utils_System_Base {
     // nullop by default
   }
 
+  /**
+   * Flush css/js caches
+   */
+  function clearResourceCache() {
+    // nullop by default
+  }
+
   /**
    * Return default Site Settings
    *
diff --git a/CRM/Utils/System/DrupalBase.php b/CRM/Utils/System/DrupalBase.php
index 7452ab8c7b..3fc5054e03 100644
--- a/CRM/Utils/System/DrupalBase.php
+++ b/CRM/Utils/System/DrupalBase.php
@@ -283,4 +283,11 @@ abstract class CRM_Utils_System_DrupalBase extends CRM_Utils_System_Base {
       watchdog('civicrm', $message, NULL, WATCHDOG_DEBUG);
     }
   }
+
+  /**
+   * Flush css/js caches
+   */
+  function clearResourceCache() {
+    _drupal_flush_css_js();
+  }
 }
-- 
2.25.1