- add locking to custom resources (Forum Post 75252)

this is a potentially dirty commit

change_log.txt

@@ -1,6 +1,7 @@
 ===== trunk  =====
 14.10.2011
 - bugfix unique_resource did not properly apply to compiled resources (Forum Topic 20128)
+- add locking to custom resources (Forum Post 75252)
 
 13.10.2011
 - add caching for config files in Smarty_Resource

libs/sysplugins/smarty_cacheresource.php

@@ -150,6 +150,7 @@ abstract class Smarty_CacheResource {
         }
         // try the instance cache
         if (isset(self::$resources[$type])) {
+            // FIXME: rodneyrehm need to validate if cache resource may be used in given $smarty.
             return self::$resources[$type];
         }
         // try registered resource

libs/sysplugins/smarty_cacheresource_custom.php

@@ -185,5 +185,54 @@ abstract class Smarty_CacheResource_Custom extends Smarty_CacheResource {
         return $this->delete($resource_name, $cache_id, $compile_id, $exp_time);
     }
     
+    /**
+     * Check is cache is locked for this template
+     *
+     * @param Smarty $smarty Smarty object
+     * @param Smarty_Template_Cached $cached cached object
+     * @return booelan true or false if cache is locked
+     */
+    public function hasLock(Smarty $smarty, Smarty_Template_Cached $cached)
+    {
+        $id = $cached->filepath;
+        $name = $cached->source->name . '.lock';
+        
+        $mtime = $this->fetchTimestamp($id, $name, null, null);
+        if ($mtime === null) {
+            $this->fetch($id, $name, null, null, &$content, &$mtime);
+        }
+        
+        return $mtime && time() - $mtime < $smarty->locking_timeout;
+    }
+
+    /**
+     * Lock cache for this template
+     *
+     * @param Smarty $smarty Smarty object
+     * @param Smarty_Template_Cached $cached cached object
+     */
+    public function acquireLock(Smarty $smarty, Smarty_Template_Cached $cached)
+    {
+        $cached->is_locked = true;
+        
+        $id = $cached->filepath;
+        $name = $cached->source->name . '.lock';
+        $this->save($id, $name, null, null, $smarty->locking_timeout, '');
+    }
+
+    /**
+     * Unlock cache for this template
+     *
+     * @param Smarty $smarty Smarty object
+     * @param Smarty_Template_Cached $cached cached object
+     */
+    public function releaseLock(Smarty $smarty, Smarty_Template_Cached $cached)
+    {
+        $cached->is_locked = false;
+        
+        $id = $cached->filepath;
+        $name = $cached->source->name . '.lock';
+        $this->delete($name, null, null, null);
+    }
 }
 ?>

libs/sysplugins/smarty_resource.php

@@ -339,6 +339,7 @@ abstract class Smarty_Resource {
     {
         // try the instance cache
         if (isset(self::$resources[$resource_type])) {
+            // FIXME: rodneyrehm need to validate if resource may be used in given $smarty.
             return self::$resources[$resource_type];
         }