API Standardise extension hooks

src/Dev/VersionedTestSessionExtension.php

@@ -19,7 +19,7 @@ class VersionedTestSessionExtension extends VersionedStateExtension
      *
      * @param string $url
      */
-    public function updateLink(&$url)
+    protected function updateLink(&$url)
     {
         $session = $this->owner->session();
         if (!$session) {

src/Versioned.php

@@ -1589,7 +1589,7 @@ protected function extendcanRestoreToDraft()
      * @param Member $member
      * @return bool|null
      */
-    public function canView($member = null)
+    protected function canView($member = null)
     {
         // Invoke default version-gnostic canView
         if ($this->owner->canViewVersioned($member) === false) {
@@ -2888,7 +2888,7 @@ protected function onBeforeDuplicate($source, $doWrite)
         $this->owner->Version = 0;
     }
 
-    public function flushCache()
+    protected function onFlushCache()
     {
         Versioned::$cache_versionnumber = [];
         $this->versionModifiedCache = [];

src/VersionedStateExtension.php

@@ -30,7 +30,7 @@ class VersionedStateExtension extends Extension
      *
      * @param string $link
      */
-    public function updateLink(&$link)
+    protected function updateLink(&$link)
     {
         // Skip if link already contains reading mode
         if ($this->hasVersionedQuery($link)) {

tests/php/VersionedTest/PublicExtension.php

@@ -10,7 +10,7 @@
  */
 class PublicExtension extends DataExtension implements TestOnly
 {
-    public function canViewNonLive($member = null)
+    protected function canViewNonLive($member = null)
     {
         return true;
     }