implement fix for issue EZP-23206 in the tracer version of the publis…

…hingqueue processor

classes/ezperfloggercontentpublishingqueue.php

@@ -29,7 +29,9 @@ protected final static function initExtraHooks()
     }
 
     /**
-     * Reimplemented, so that we give back a different type of item to the queue processor
+     * Reimplemented, so that
+     * - we give back a different type of item to the queue processor
+     * - we only allow 1 concurrent publication per-object at a time
      */
     public static function next()
     {
@@ -43,6 +45,19 @@ public static function next()
         if ( count( $queuedProcess ) == 0 )
             return false;
         else
+        {
+            // check if another instance is being published of the same object
+            $db = eZDB::instance();
+            $processing = $db->arrayQuery( "SELECT count(*) AS other" .
+                "FROM ezpublishingqueueprocesses p, ezcontentobject_version v " .
+                "WHERE p.ezcontentobject_version_id = v.id AND p.status = 1 AND v.contentobject_id IN ( " .
+                "SELECT contentobject_id FROM ezcontentobject_version v2 WHERE id = " . $queuedProcess[0]->attribute('ezcontentobject_version_id') . " )"
+            );
+            if ( $processing[0]['other'] )
+            {
+                return false;
+            }
             return $queuedProcess[0];
+        }
     }
 }

doc/changelogs/changelog-0.11.1-to-0.12

@@ -15,4 +15,6 @@ changelog from version 0.11 to 0.12 - released 2014.9.xx
 
 - Minor fix in the tracer for imagemagick conversion for eZP 4.6 to 5.1 (was referencing a class from the 4.5 tracers)
 
+- implement fix for issue EZP-23206 in the tracer version of the publishingqueue processor
+
 * Changes